re PR fortran/45197 ([F2008] Allow IMPURE elemental procedures)

2010-08-15  Daniel Kraft  <d@domob.eu>

	PR fortran/45197
	* decl.c (gfc_match_prefix): Match IMPURE prefix and mark ELEMENTAL
	routines not IMPURE also as PURE.
	* intrinsic.c (enum klass): New class `CLASS_PURE' and renamed
	`NO_CLASS' in `CLASS_IMPURE'.
	(add_sym): Set symbol-attributes `pure' and `elemental' correctly.
	(add_sym_0s): Renamed `NO_CLASS' in `CLASS_IMPURE'.
	(add_functions): Ditto.
	(add_subroutines): Ditto and mark `MOVE_ALLOC' as CLASS_PURE.
	* resolve.c (gfc_pure): Do not treat ELEMENTAL as automatically PURE.
	(resolve_formal_arglist): Check that arguments to ELEMENTAL procedures
	are not ALLOCATABLE and have their INTENT specified.

2010-08-15  Daniel Kraft  <d@domob.eu>

	PR fortran/45197
	* gfortran.dg/elemental_args_check_3.f90: New test.
	* gfortran.dg/impure_1.f08: New test.
	* gfortran.dg/impure_2.f08: New test.
	* gfortran.dg/impure_3.f90: New test.
	* gfortran.dg/typebound_proc_6.f03: Changed expected error message.

From-SVN: r163261

1 files changed, 177 insertions, 168 deletions

diff --git a/gcc/fortran/intrinsic.c b/gcc/fortran/intrinsic.c
index c9e3833..cdfcca7 100644
--- a/gcc/fortran/intrinsic.c
+++ b/gcc/fortran/intrinsic.c
@@ -50,7 +50,8 @@ static enum
 sizing;
 
 enum klass
-{ NO_CLASS = 0, CLASS_ELEMENTAL, CLASS_INQUIRY, CLASS_TRANSFORMATIONAL };
+{ CLASS_IMPURE = 0, CLASS_PURE, CLASS_ELEMENTAL,
+  CLASS_INQUIRY, CLASS_TRANSFORMATIONAL };
 
 #define ACTUAL_NO	0
 #define ACTUAL_YES	1
@@ -273,6 +274,10 @@ add_sym (const char *name, gfc_isym_id id, enum klass cl, int actual_ok, bt type
       strcat (buf, name);
       next_sym->lib_name = gfc_get_string (buf);
 
+      /* There are no IMPURE ELEMENTAL intrinsics, thus the ELEMENTAL class
+	 also implies PURE.  Additionally, there's the PURE class itself.  */
+      next_sym->pure = (cl == CLASS_ELEMENTAL || cl == CLASS_PURE);
+
       next_sym->elemental = (cl == CLASS_ELEMENTAL);
       next_sym->inquiry = (cl == CLASS_INQUIRY);
       next_sym->transformational = (cl == CLASS_TRANSFORMATIONAL);
@@ -362,7 +367,8 @@ add_sym_0 (const char *name, gfc_isym_id id, enum klass cl, int actual_ok, bt ty
    0 arguments.  */
 
 static void
-add_sym_0s (const char *name, gfc_isym_id id, int standard, void (*resolve) (gfc_code *))
+add_sym_0s (const char *name, gfc_isym_id id, int standard,
+	    void (*resolve) (gfc_code *))
 {
   gfc_check_f cf;
   gfc_simplify_f sf;
@@ -372,8 +378,8 @@ add_sym_0s (const char *name, gfc_isym_id id, int standard, void (*resolve) (gfc
   sf.f1 = NULL;
   rf.s1 = resolve;
 
-  add_sym (name, id, NO_CLASS, ACTUAL_NO, BT_UNKNOWN, 0, standard, cf, sf, rf,
-	   (void *) 0);
+  add_sym (name, id, CLASS_IMPURE, ACTUAL_NO, BT_UNKNOWN, 0, standard, cf, sf,
+	   rf, (void *) 0);
 }
 
 
@@ -1119,8 +1125,8 @@ add_functions (void)
 
   /* The checking function for ACCESS is called gfc_check_access_func
      because the name gfc_check_access is already used in module.c.  */
-  add_sym_2 ("access", GFC_ISYM_ACCESS, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_access_func, NULL, gfc_resolve_access,
+  add_sym_2 ("access", GFC_ISYM_ACCESS, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_access_func, NULL, gfc_resolve_access,
 	     nm, BT_CHARACTER, dc, REQUIRED, md, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("access", GFC_ISYM_ACCESS, GFC_STD_GNU);
@@ -1373,14 +1379,14 @@ add_functions (void)
 
   make_generic ("char", GFC_ISYM_CHAR, GFC_STD_F77);
 
-  add_sym_1 ("chdir", GFC_ISYM_CHDIR, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_1 ("chdir", GFC_ISYM_CHDIR, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, gfc_check_chdir, NULL, gfc_resolve_chdir,
 	     nm, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("chdir", GFC_ISYM_CHDIR, GFC_STD_GNU);
 
-  add_sym_2 ("chmod", GFC_ISYM_CHMOD, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_chmod, NULL, gfc_resolve_chmod,
+  add_sym_2 ("chmod", GFC_ISYM_CHMOD, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_chmod, NULL, gfc_resolve_chmod,
 	     nm, BT_CHARACTER, dc, REQUIRED, md, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("chmod", GFC_ISYM_CHMOD, GFC_STD_GNU);
@@ -1468,9 +1474,9 @@ add_functions (void)
 
   make_generic ("cshift", GFC_ISYM_CSHIFT, GFC_STD_F95);
 
-  add_sym_1 ("ctime", GFC_ISYM_CTIME, NO_CLASS, ACTUAL_NO, BT_CHARACTER, 0, GFC_STD_GNU,
-	      gfc_check_ctime, NULL, gfc_resolve_ctime,
-	      tm, BT_INTEGER, di, REQUIRED);
+  add_sym_1 ("ctime", GFC_ISYM_CTIME, CLASS_IMPURE, ACTUAL_NO, BT_CHARACTER,
+	     0, GFC_STD_GNU, gfc_check_ctime, NULL, gfc_resolve_ctime,
+	     tm, BT_INTEGER, di, REQUIRED);
 
   make_generic ("ctime", GFC_ISYM_CTIME, GFC_STD_GNU);
 
@@ -1560,14 +1566,14 @@ add_functions (void)
   make_generic ("erfc_scaled", GFC_ISYM_ERFC_SCALED, GFC_STD_F2008);
 
   /* G77 compatibility */
-  add_sym_1 ("dtime", GFC_ISYM_DTIME, NO_CLASS, ACTUAL_NO, BT_REAL, 4,  GFC_STD_GNU,
-	     gfc_check_dtime_etime, NULL, NULL,
+  add_sym_1 ("dtime", GFC_ISYM_DTIME, CLASS_IMPURE, ACTUAL_NO, BT_REAL,
+	     4, GFC_STD_GNU, gfc_check_dtime_etime, NULL, NULL,
 	     x, BT_REAL, 4, REQUIRED);
 
   make_generic ("dtime", GFC_ISYM_DTIME, GFC_STD_GNU);
 
-  add_sym_1 ("etime", GFC_ISYM_ETIME, NO_CLASS, ACTUAL_NO, BT_REAL, 4,  GFC_STD_GNU,
-	     gfc_check_dtime_etime, NULL, NULL,
+  add_sym_1 ("etime", GFC_ISYM_ETIME, CLASS_IMPURE, ACTUAL_NO, BT_REAL,
+	     4, GFC_STD_GNU, gfc_check_dtime_etime, NULL, NULL,
 	     x, BT_REAL, 4, REQUIRED);
 
   make_generic ("etime", GFC_ISYM_ETIME, GFC_STD_GNU);
@@ -1604,8 +1610,8 @@ add_functions (void)
 	     a, BT_UNKNOWN, 0, REQUIRED,
 	     mo, BT_UNKNOWN, 0, REQUIRED);
 
-  add_sym_0 ("fdate",  GFC_ISYM_FDATE, NO_CLASS, ACTUAL_NO, BT_CHARACTER, dc, GFC_STD_GNU,
-	     NULL, NULL, gfc_resolve_fdate);
+  add_sym_0 ("fdate",  GFC_ISYM_FDATE, CLASS_IMPURE, ACTUAL_NO, BT_CHARACTER,
+	     dc, GFC_STD_GNU, NULL, NULL, gfc_resolve_fdate);
 
   make_generic ("fdate", GFC_ISYM_FDATE, GFC_STD_GNU);
 
@@ -1616,8 +1622,8 @@ add_functions (void)
   make_generic ("floor", GFC_ISYM_FLOOR, GFC_STD_F95);
 
   /* G77 compatible fnum */
-  add_sym_1 ("fnum", GFC_ISYM_FNUM, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_fnum, NULL, gfc_resolve_fnum,
+  add_sym_1 ("fnum", GFC_ISYM_FNUM, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_fnum, NULL, gfc_resolve_fnum,
 	     ut, BT_INTEGER, di, REQUIRED);
 
   make_generic ("fnum", GFC_ISYM_FNUM, GFC_STD_GNU);
@@ -1628,38 +1634,38 @@ add_functions (void)
 
   make_generic ("fraction", GFC_ISYM_FRACTION, GFC_STD_F95);
 
-  add_sym_2 ("fstat", GFC_ISYM_FSTAT, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_2 ("fstat", GFC_ISYM_FSTAT, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, gfc_check_fstat, NULL, gfc_resolve_fstat,
 	     ut, BT_INTEGER, di, REQUIRED, vl, BT_INTEGER, di, REQUIRED);
 
   make_generic ("fstat", GFC_ISYM_FSTAT, GFC_STD_GNU);
 
-  add_sym_1 ("ftell", GFC_ISYM_FTELL, NO_CLASS, ACTUAL_NO, BT_INTEGER, ii, GFC_STD_GNU,
-	     gfc_check_ftell, NULL, gfc_resolve_ftell,
+  add_sym_1 ("ftell", GFC_ISYM_FTELL, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     ii, GFC_STD_GNU, gfc_check_ftell, NULL, gfc_resolve_ftell,
 	     ut, BT_INTEGER, di, REQUIRED);
 
   make_generic ("ftell", GFC_ISYM_FTELL, GFC_STD_GNU);
 
-  add_sym_2 ("fgetc", GFC_ISYM_FGETC, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_fgetputc, NULL, gfc_resolve_fgetc,
+  add_sym_2 ("fgetc", GFC_ISYM_FGETC, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_fgetputc, NULL, gfc_resolve_fgetc,
 	     ut, BT_INTEGER, di, REQUIRED, c, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("fgetc", GFC_ISYM_FGETC, GFC_STD_GNU);
 
-  add_sym_1 ("fget", GFC_ISYM_FGET, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_fgetput, NULL, gfc_resolve_fget,
+  add_sym_1 ("fget", GFC_ISYM_FGET, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_fgetput, NULL, gfc_resolve_fget,
 	     c, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("fget", GFC_ISYM_FGET, GFC_STD_GNU);
 
-  add_sym_2 ("fputc", GFC_ISYM_FPUTC, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_fgetputc, NULL, gfc_resolve_fputc,
+  add_sym_2 ("fputc", GFC_ISYM_FPUTC, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_fgetputc, NULL, gfc_resolve_fputc,
 	     ut, BT_INTEGER, di, REQUIRED, c, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("fputc", GFC_ISYM_FPUTC, GFC_STD_GNU);
 
-  add_sym_1 ("fput", GFC_ISYM_FPUT, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_fgetput, NULL, gfc_resolve_fput,
+  add_sym_1 ("fput", GFC_ISYM_FPUT, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_fgetput, NULL, gfc_resolve_fput,
 	     c, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("fput", GFC_ISYM_FPUT, GFC_STD_GNU);
@@ -1675,29 +1681,29 @@ add_functions (void)
   make_generic ("gamma", GFC_ISYM_TGAMMA, GFC_STD_F2008);
 
   /* Unix IDs (g77 compatibility)  */
-  add_sym_1 ("getcwd", GFC_ISYM_GETCWD, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,  GFC_STD_GNU,
-	     NULL, NULL, gfc_resolve_getcwd,
+  add_sym_1 ("getcwd", GFC_ISYM_GETCWD, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di,  GFC_STD_GNU, NULL, NULL, gfc_resolve_getcwd,
 	     c, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("getcwd", GFC_ISYM_GETCWD, GFC_STD_GNU);
 
-  add_sym_0 ("getgid", GFC_ISYM_GETGID, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     NULL, NULL, gfc_resolve_getgid);
+  add_sym_0 ("getgid", GFC_ISYM_GETGID, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, NULL, NULL, gfc_resolve_getgid);
 
   make_generic ("getgid", GFC_ISYM_GETGID, GFC_STD_GNU);
 
-  add_sym_0 ("getpid", GFC_ISYM_GETPID, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU, 
-	     NULL, NULL, gfc_resolve_getpid);
+  add_sym_0 ("getpid", GFC_ISYM_GETPID, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, NULL, NULL, gfc_resolve_getpid);
 
   make_generic ("getpid", GFC_ISYM_GETPID, GFC_STD_GNU);
 
-  add_sym_0 ("getuid", GFC_ISYM_GETUID, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU, 
-	     NULL, NULL, gfc_resolve_getuid);
+  add_sym_0 ("getuid", GFC_ISYM_GETUID, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, NULL, NULL, gfc_resolve_getuid);
 
   make_generic ("getuid", GFC_ISYM_GETUID, GFC_STD_GNU);
 
-  add_sym_1 ("hostnm", GFC_ISYM_HOSTNM, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_hostnm, NULL, gfc_resolve_hostnm,
+  add_sym_1 ("hostnm", GFC_ISYM_HOSTNM, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_hostnm, NULL, gfc_resolve_hostnm,
 	     a, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("hostnm", GFC_ISYM_HOSTNM, GFC_STD_GNU);
@@ -1728,14 +1734,14 @@ add_functions (void)
 
   make_generic ("iand", GFC_ISYM_IAND, GFC_STD_F95);
 
-  add_sym_2 ("and", GFC_ISYM_AND, NO_CLASS, ACTUAL_NO, BT_LOGICAL, dl, GFC_STD_GNU,
-	     gfc_check_and, gfc_simplify_and, gfc_resolve_and,
+  add_sym_2 ("and", GFC_ISYM_AND, CLASS_IMPURE, ACTUAL_NO, BT_LOGICAL,
+	     dl, GFC_STD_GNU, gfc_check_and, gfc_simplify_and, gfc_resolve_and,
 	     i, BT_UNKNOWN, 0, REQUIRED, j, BT_UNKNOWN, 0, REQUIRED);
 
   make_generic ("and", GFC_ISYM_AND, GFC_STD_GNU);
 
-  add_sym_0 ("iargc", GFC_ISYM_IARGC, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     NULL, NULL, NULL);
+  add_sym_0 ("iargc", GFC_ISYM_IARGC, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, NULL, NULL, NULL);
 
   make_generic ("iargc", GFC_ISYM_IARGC, GFC_STD_GNU);
 
@@ -1771,14 +1777,14 @@ add_functions (void)
 
   make_generic ("ieor", GFC_ISYM_IEOR, GFC_STD_F95);
 
-  add_sym_2 ("xor", GFC_ISYM_XOR, NO_CLASS, ACTUAL_NO, BT_LOGICAL, dl, GFC_STD_GNU,
-	     gfc_check_and, gfc_simplify_xor, gfc_resolve_xor,
+  add_sym_2 ("xor", GFC_ISYM_XOR, CLASS_IMPURE, ACTUAL_NO, BT_LOGICAL,
+	     dl, GFC_STD_GNU, gfc_check_and, gfc_simplify_xor, gfc_resolve_xor,
 	     i, BT_UNKNOWN, 0, REQUIRED, j, BT_UNKNOWN, 0, REQUIRED);
 
   make_generic ("xor", GFC_ISYM_XOR, GFC_STD_GNU);
 
-  add_sym_0 ("ierrno", GFC_ISYM_IERRNO, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     NULL, NULL, gfc_resolve_ierrno);
+  add_sym_0 ("ierrno", GFC_ISYM_IERRNO, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, NULL, NULL, gfc_resolve_ierrno);
 
   make_generic ("ierrno", GFC_ISYM_IERRNO, GFC_STD_GNU);
 
@@ -1836,21 +1842,21 @@ add_functions (void)
 
   make_generic ("ior", GFC_ISYM_IOR, GFC_STD_F95);
 
-  add_sym_2 ("or", GFC_ISYM_OR, NO_CLASS, ACTUAL_NO, BT_LOGICAL, dl, GFC_STD_GNU,
-	     gfc_check_and, gfc_simplify_or, gfc_resolve_or,
+  add_sym_2 ("or", GFC_ISYM_OR, CLASS_IMPURE, ACTUAL_NO, BT_LOGICAL,
+	     dl, GFC_STD_GNU, gfc_check_and, gfc_simplify_or, gfc_resolve_or,
 	     i, BT_UNKNOWN, 0, REQUIRED, j, BT_UNKNOWN, 0, REQUIRED);
 
   make_generic ("or", GFC_ISYM_OR, GFC_STD_GNU);
 
   /* The following function is for G77 compatibility.  */
-  add_sym_1 ("irand", GFC_ISYM_IRAND, NO_CLASS, ACTUAL_NO, BT_INTEGER, 4, GFC_STD_GNU,
-	     gfc_check_irand, NULL, NULL,
+  add_sym_1 ("irand", GFC_ISYM_IRAND, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     4, GFC_STD_GNU, gfc_check_irand, NULL, NULL,
 	     i, BT_INTEGER, 4, OPTIONAL);
 
   make_generic ("irand", GFC_ISYM_IRAND, GFC_STD_GNU);
 
-  add_sym_1 ("isatty", GFC_ISYM_ISATTY, NO_CLASS, ACTUAL_NO, BT_LOGICAL, dl, GFC_STD_GNU,
-	     gfc_check_isatty, NULL, gfc_resolve_isatty,
+  add_sym_1 ("isatty", GFC_ISYM_ISATTY, CLASS_IMPURE, ACTUAL_NO, BT_LOGICAL,
+	     dl, GFC_STD_GNU, gfc_check_isatty, NULL, gfc_resolve_isatty,
 	     ut, BT_INTEGER, di, REQUIRED);
 
   make_generic ("isatty", GFC_ISYM_ISATTY, GFC_STD_GNU);
@@ -1901,8 +1907,8 @@ add_functions (void)
 
   make_generic ("ishftc", GFC_ISYM_ISHFTC, GFC_STD_F95);
 
-  add_sym_2 ("kill", GFC_ISYM_KILL, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_kill, NULL, gfc_resolve_kill,
+  add_sym_2 ("kill", GFC_ISYM_KILL, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_kill, NULL, gfc_resolve_kill,
 	     a, BT_INTEGER, di, REQUIRED, b, BT_INTEGER, di, REQUIRED);
 
   make_generic ("kill", GFC_ISYM_KILL, GFC_STD_GNU);
@@ -1994,7 +2000,7 @@ add_functions (void)
 
   make_generic ("llt", GFC_ISYM_LLT, GFC_STD_F77);
 
-  add_sym_2 ("link", GFC_ISYM_LINK, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_2 ("link", GFC_ISYM_LINK, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, gfc_check_link, NULL, gfc_resolve_link,
 	     p1, BT_CHARACTER, dc, REQUIRED, p2, BT_CHARACTER, dc, REQUIRED);
 
@@ -2044,13 +2050,13 @@ add_functions (void)
 
   make_generic ("logical", GFC_ISYM_LOGICAL, GFC_STD_F95);
 
-  add_sym_2 ("lstat", GFC_ISYM_LSTAT, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_2 ("lstat", GFC_ISYM_LSTAT, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, gfc_check_stat, NULL, gfc_resolve_lstat,
 	     nm, BT_CHARACTER, dc, REQUIRED, vl, BT_INTEGER, di, REQUIRED);
 
   make_generic ("lstat", GFC_ISYM_LSTAT, GFC_STD_GNU);
 
-  add_sym_1 ("malloc", GFC_ISYM_MALLOC, NO_CLASS, ACTUAL_NO, BT_INTEGER, ii,
+  add_sym_1 ("malloc", GFC_ISYM_MALLOC, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, ii,
 	     GFC_STD_GNU, gfc_check_malloc, NULL, gfc_resolve_malloc,
 	     sz, BT_INTEGER, di, REQUIRED);
 
@@ -2111,13 +2117,13 @@ add_functions (void)
 
   make_generic ("maxval", GFC_ISYM_MAXVAL, GFC_STD_F95);
 
-  add_sym_0 ("mclock", GFC_ISYM_MCLOCK, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_0 ("mclock", GFC_ISYM_MCLOCK, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, NULL, NULL, gfc_resolve_mclock);
 
   make_generic ("mclock", GFC_ISYM_MCLOCK, GFC_STD_GNU);
 
-  add_sym_0 ("mclock8", GFC_ISYM_MCLOCK8, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
-	     GFC_STD_GNU, NULL, NULL, gfc_resolve_mclock8);
+  add_sym_0 ("mclock8", GFC_ISYM_MCLOCK8, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, NULL, NULL, gfc_resolve_mclock8);
 
   make_generic ("mclock8", GFC_ISYM_MCLOCK8, GFC_STD_GNU);
 
@@ -2267,8 +2273,8 @@ add_functions (void)
   make_generic ("radix", GFC_ISYM_RADIX, GFC_STD_F95);
 
   /* The following function is for G77 compatibility.  */
-  add_sym_1 ("rand", GFC_ISYM_RAND, NO_CLASS, ACTUAL_NO, BT_REAL, 4, GFC_STD_GNU,
-	     gfc_check_rand, NULL, NULL,
+  add_sym_1 ("rand", GFC_ISYM_RAND, CLASS_IMPURE, ACTUAL_NO, BT_REAL,
+	     4, GFC_STD_GNU, gfc_check_rand, NULL, NULL,
 	     i, BT_INTEGER, 4, OPTIONAL);
 
   /* Compatibility with HP FORTRAN 77/iX Reference.  Note, rand() and ran()
@@ -2306,7 +2312,7 @@ add_functions (void)
 
   make_generic ("real", GFC_ISYM_REAL, GFC_STD_F77);
 
-  add_sym_2 ("rename", GFC_ISYM_RENAME, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_2 ("rename", GFC_ISYM_RENAME, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, gfc_check_rename, NULL, gfc_resolve_rename,
 	     p1, BT_CHARACTER, dc, REQUIRED, p2, BT_CHARACTER, dc, REQUIRED);
 
@@ -2352,14 +2358,14 @@ add_functions (void)
   make_generic ("scan", GFC_ISYM_SCAN, GFC_STD_F95);
 
   /* Added for G77 compatibility garbage.  */
-  add_sym_0 ("second", GFC_ISYM_SECOND, NO_CLASS, ACTUAL_NO, BT_REAL, 4, GFC_STD_GNU,
-	     NULL, NULL, NULL);
+  add_sym_0 ("second", GFC_ISYM_SECOND, CLASS_IMPURE, ACTUAL_NO, BT_REAL,
+	     4, GFC_STD_GNU, NULL, NULL, NULL);
 
   make_generic ("second", GFC_ISYM_SECOND, GFC_STD_GNU);
 
   /* Added for G77 compatibility.  */
-  add_sym_1 ("secnds", GFC_ISYM_SECNDS, NO_CLASS, ACTUAL_NO, BT_REAL, dr, GFC_STD_GNU,
-	     gfc_check_secnds, NULL, gfc_resolve_secnds,
+  add_sym_1 ("secnds", GFC_ISYM_SECNDS, CLASS_IMPURE, ACTUAL_NO, BT_REAL,
+	     dr, GFC_STD_GNU, gfc_check_secnds, NULL, gfc_resolve_secnds,
 	     x, BT_REAL, dr, REQUIRED);
 
   make_generic ("secnds", GFC_ISYM_SECNDS, GFC_STD_GNU);
@@ -2412,8 +2418,8 @@ add_functions (void)
 
   make_generic ("sign", GFC_ISYM_SIGN, GFC_STD_F77);
 
-  add_sym_2 ("signal", GFC_ISYM_SIGNAL, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_signal, NULL, gfc_resolve_signal,
+  add_sym_2 ("signal", GFC_ISYM_SIGNAL, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_signal, NULL, gfc_resolve_signal,
 	     num, BT_INTEGER, di, REQUIRED, han, BT_UNKNOWN, 0, REQUIRED);
 
   make_generic ("signal", GFC_ISYM_SIGNAL, GFC_STD_GNU);
@@ -2456,7 +2462,7 @@ add_functions (void)
 
   make_generic ("size", GFC_ISYM_SIZE, GFC_STD_F95);
 
-  add_sym_1 ("sizeof", GFC_ISYM_SIZEOF, NO_CLASS, ACTUAL_NO, BT_INTEGER, ii,
+  add_sym_1 ("sizeof", GFC_ISYM_SIZEOF, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, ii,
 	     GFC_STD_GNU, gfc_check_sizeof, NULL, NULL,
 	     x, BT_UNKNOWN, 0, REQUIRED);
 
@@ -2499,7 +2505,7 @@ add_functions (void)
 
   make_generic ("sqrt", GFC_ISYM_SQRT, GFC_STD_F77);
 
-  add_sym_2 ("stat", GFC_ISYM_STAT, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_2 ("stat", GFC_ISYM_STAT, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, gfc_check_stat, NULL, gfc_resolve_stat,
 	     nm, BT_CHARACTER, dc, REQUIRED, vl, BT_INTEGER, di, REQUIRED);
 
@@ -2518,13 +2524,13 @@ add_functions (void)
 
   make_generic ("sum", GFC_ISYM_SUM, GFC_STD_F95);
 
-  add_sym_2 ("symlnk", GFC_ISYM_SYMLNK, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_2 ("symlnk", GFC_ISYM_SYMLNK, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, gfc_check_symlnk, NULL, gfc_resolve_symlnk,
 	     p1, BT_CHARACTER, dc, REQUIRED, p2, BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("symlnk", GFC_ISYM_SYMLNK, GFC_STD_GNU);
 
-  add_sym_1 ("system", GFC_ISYM_SYSTEM, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_1 ("system", GFC_ISYM_SYSTEM, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, NULL, NULL, NULL,
 	     com, BT_CHARACTER, dc, REQUIRED);
 
@@ -2554,13 +2560,13 @@ add_functions (void)
 	     gfc_check_this_image, gfc_simplify_this_image, gfc_resolve_this_image,
 	     ca, BT_REAL, dr, OPTIONAL, dm, BT_INTEGER, ii, OPTIONAL);
 
-  add_sym_0 ("time", GFC_ISYM_TIME, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU, 
-	     NULL, NULL, gfc_resolve_time);
+  add_sym_0 ("time", GFC_ISYM_TIME, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, NULL, NULL, gfc_resolve_time);
 
   make_generic ("time", GFC_ISYM_TIME, GFC_STD_GNU);
 
-  add_sym_0 ("time8", GFC_ISYM_TIME8, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU, 
-	     NULL, NULL, gfc_resolve_time8);
+  add_sym_0 ("time8", GFC_ISYM_TIME8, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, NULL, NULL, gfc_resolve_time8);
 
   make_generic ("time8", GFC_ISYM_TIME8, GFC_STD_GNU);
 
@@ -2596,8 +2602,8 @@ add_functions (void)
 
   make_generic ("trim", GFC_ISYM_TRIM, GFC_STD_F95);
 
-  add_sym_1 ("ttynam", GFC_ISYM_TTYNAM, NO_CLASS, ACTUAL_NO, BT_CHARACTER, 0, GFC_STD_GNU,
-	     gfc_check_ttynam, NULL, gfc_resolve_ttynam,
+  add_sym_1 ("ttynam", GFC_ISYM_TTYNAM, CLASS_IMPURE, ACTUAL_NO, BT_CHARACTER,
+	     0, GFC_STD_GNU, gfc_check_ttynam, NULL, gfc_resolve_ttynam,
 	     ut, BT_INTEGER, di, REQUIRED);
 
   make_generic ("ttynam", GFC_ISYM_TTYNAM, GFC_STD_GNU);
@@ -2611,23 +2617,23 @@ add_functions (void)
   make_generic ("ubound", GFC_ISYM_UBOUND, GFC_STD_F95);
 
   add_sym_3 ("ucobound", GFC_ISYM_UCOBOUND, CLASS_INQUIRY, ACTUAL_NO,
-            BT_INTEGER, di, GFC_STD_F2008,
-            gfc_check_ucobound, gfc_simplify_ucobound, gfc_resolve_ucobound,
-            ca, BT_REAL, dr, REQUIRED, dm, BT_INTEGER, ii, OPTIONAL,
-            kind, BT_INTEGER, di, OPTIONAL);
+	    BT_INTEGER, di, GFC_STD_F2008,
+	    gfc_check_ucobound, gfc_simplify_ucobound, gfc_resolve_ucobound,
+	    ca, BT_REAL, dr, REQUIRED, dm, BT_INTEGER, ii, OPTIONAL,
+	    kind, BT_INTEGER, di, OPTIONAL);
 
   make_generic ("ucobound", GFC_ISYM_UCOBOUND, GFC_STD_F2008);
 
   /* g77 compatibility for UMASK.  */
-  add_sym_1 ("umask", GFC_ISYM_UMASK, NO_CLASS, ACTUAL_NO, BT_INTEGER, di,
+  add_sym_1 ("umask", GFC_ISYM_UMASK, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, di,
 	     GFC_STD_GNU, gfc_check_umask, NULL, gfc_resolve_umask,
 	     msk, BT_INTEGER, di, REQUIRED);
 
   make_generic ("umask", GFC_ISYM_UMASK, GFC_STD_GNU);
 
   /* g77 compatibility for UNLINK.  */
-  add_sym_1 ("unlink", GFC_ISYM_UNLINK, NO_CLASS, ACTUAL_NO, BT_INTEGER, di, GFC_STD_GNU,
-	     gfc_check_unlink, NULL, gfc_resolve_unlink,
+  add_sym_1 ("unlink", GFC_ISYM_UNLINK, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER,
+	     di, GFC_STD_GNU, gfc_check_unlink, NULL, gfc_resolve_unlink,
 	     "path", BT_CHARACTER, dc, REQUIRED);
 
   make_generic ("unlink", GFC_ISYM_UNLINK, GFC_STD_GNU);
@@ -2647,7 +2653,7 @@ add_functions (void)
 
   make_generic ("verify", GFC_ISYM_VERIFY, GFC_STD_F95);
     
-  add_sym_1 ("loc", GFC_ISYM_LOC, NO_CLASS, ACTUAL_NO, BT_INTEGER, ii,
+  add_sym_1 ("loc", GFC_ISYM_LOC, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, ii,
 	     GFC_STD_GNU, gfc_check_loc, NULL, gfc_resolve_loc,
 	     x, BT_UNKNOWN, 0, REQUIRED);
 		
@@ -2685,96 +2691,97 @@ add_subroutines (void)
 
   make_noreturn();
 
-  add_sym_1s_intent ("cpu_time", GFC_ISYM_CPU_TIME, NO_CLASS, BT_UNKNOWN, 0,
+  add_sym_1s_intent ("cpu_time", GFC_ISYM_CPU_TIME, CLASS_IMPURE, BT_UNKNOWN, 0,
 		     GFC_STD_F95, gfc_check_cpu_time, NULL,
 		     gfc_resolve_cpu_time,
 		     tm, BT_REAL, dr, REQUIRED, INTENT_OUT);
 
   /* More G77 compatibility garbage.  */
-  add_sym_2s ("ctime", GFC_ISYM_CTIME, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_2s ("ctime", GFC_ISYM_CTIME, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_ctime_sub, NULL, gfc_resolve_ctime_sub,
 	      tm, BT_INTEGER, di, REQUIRED, res, BT_CHARACTER, dc, REQUIRED);
 
-  add_sym_1s ("idate", GFC_ISYM_IDATE, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_1s ("idate", GFC_ISYM_IDATE, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_itime_idate, NULL, gfc_resolve_idate,
 	      vl, BT_INTEGER, 4, REQUIRED);
 
-  add_sym_1s ("itime", GFC_ISYM_ITIME, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_1s ("itime", GFC_ISYM_ITIME, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_itime_idate, NULL, gfc_resolve_itime,
 	      vl, BT_INTEGER, 4, REQUIRED);
 
-  add_sym_2s ("ltime", GFC_ISYM_LTIME, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_2s ("ltime", GFC_ISYM_LTIME, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_ltime_gmtime, NULL, gfc_resolve_ltime,
 	      tm, BT_INTEGER, di, REQUIRED, vl, BT_INTEGER, di, REQUIRED);
 
-  add_sym_2s ("gmtime", GFC_ISYM_GMTIME, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_ltime_gmtime, NULL, gfc_resolve_gmtime,
+  add_sym_2s ("gmtime", GFC_ISYM_GMTIME, CLASS_IMPURE, BT_UNKNOWN,
+	      0, GFC_STD_GNU, gfc_check_ltime_gmtime, NULL, gfc_resolve_gmtime,
 	      tm, BT_INTEGER, di, REQUIRED, vl, BT_INTEGER, di, REQUIRED);
 
-  add_sym_1s ("second", GFC_ISYM_SECOND, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_second_sub, NULL, gfc_resolve_second_sub,
+  add_sym_1s ("second", GFC_ISYM_SECOND, CLASS_IMPURE, BT_UNKNOWN, 0,
+	      GFC_STD_GNU, gfc_check_second_sub, NULL, gfc_resolve_second_sub,
 	      tm, BT_REAL, dr, REQUIRED);
 
-  add_sym_2s ("chdir", GFC_ISYM_CHDIR, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_2s ("chdir", GFC_ISYM_CHDIR, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_chdir_sub, NULL, gfc_resolve_chdir_sub,
 	      name, BT_CHARACTER, dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_3s ("chmod", GFC_ISYM_CHMOD, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_3s ("chmod", GFC_ISYM_CHMOD, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_chmod_sub, NULL, gfc_resolve_chmod_sub,
 	      name, BT_CHARACTER, dc, REQUIRED, md, BT_CHARACTER, dc, REQUIRED,
 	      st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_4s ("date_and_time", GFC_ISYM_DATE_AND_TIME, NO_CLASS, BT_UNKNOWN, 0,
-	      GFC_STD_F95, gfc_check_date_and_time, NULL, NULL,
+  add_sym_4s ("date_and_time", GFC_ISYM_DATE_AND_TIME, CLASS_IMPURE, BT_UNKNOWN,
+	      0, GFC_STD_F95, gfc_check_date_and_time, NULL, NULL,
 	      dt, BT_CHARACTER, dc, OPTIONAL, INTENT_OUT,
 	      tm, BT_CHARACTER, dc, OPTIONAL, INTENT_OUT,
 	      zn, BT_CHARACTER, dc, OPTIONAL, INTENT_OUT,
 	      vl, BT_INTEGER, di, OPTIONAL, INTENT_OUT);
 
   /* More G77 compatibility garbage.  */
-  add_sym_2s ("etime", GFC_ISYM_ETIME, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_2s ("etime", GFC_ISYM_ETIME, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_dtime_etime_sub, NULL, gfc_resolve_etime_sub,
 	      vl, BT_REAL, 4, REQUIRED, tm, BT_REAL, 4, REQUIRED);
 
-  add_sym_2s ("dtime", GFC_ISYM_DTIME, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_2s ("dtime", GFC_ISYM_DTIME, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_dtime_etime_sub, NULL, gfc_resolve_dtime_sub,
 	      vl, BT_REAL, 4, REQUIRED, tm, BT_REAL, 4, REQUIRED);
 
-  add_sym_1s ("fdate", GFC_ISYM_FDATE, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_1s ("fdate", GFC_ISYM_FDATE, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_fdate_sub, NULL, gfc_resolve_fdate_sub,
 	      dt, BT_CHARACTER, dc, REQUIRED);
 
-  add_sym_1s ("gerror", GFC_ISYM_GERROR, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_gerror, NULL, gfc_resolve_gerror, res, BT_CHARACTER,
-	      dc, REQUIRED);
+  add_sym_1s ("gerror", GFC_ISYM_GERROR, CLASS_IMPURE, BT_UNKNOWN,
+	      0, GFC_STD_GNU, gfc_check_gerror, NULL, gfc_resolve_gerror,
+	      res, BT_CHARACTER, dc, REQUIRED);
 
-  add_sym_2s ("getcwd", GFC_ISYM_GETCWD, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_getcwd_sub, NULL, gfc_resolve_getcwd_sub,
+  add_sym_2s ("getcwd", GFC_ISYM_GETCWD, CLASS_IMPURE, BT_UNKNOWN, 0,
+	      GFC_STD_GNU, gfc_check_getcwd_sub, NULL, gfc_resolve_getcwd_sub,
 	      c, BT_CHARACTER, dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_2s ("getenv", GFC_ISYM_GETENV, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      NULL, NULL, NULL,
-	      name, BT_CHARACTER, dc, REQUIRED, val, BT_CHARACTER, dc,
-	      REQUIRED);
+  add_sym_2s ("getenv", GFC_ISYM_GETENV, CLASS_IMPURE, BT_UNKNOWN,
+	      0, GFC_STD_GNU, NULL, NULL, NULL,
+	      name, BT_CHARACTER, dc, REQUIRED,
+	      val, BT_CHARACTER, dc, REQUIRED);
 
-  add_sym_2s ("getarg", GFC_ISYM_GETARG, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_getarg, NULL, gfc_resolve_getarg,
+  add_sym_2s ("getarg", GFC_ISYM_GETARG, CLASS_IMPURE, BT_UNKNOWN,
+	      0, GFC_STD_GNU, gfc_check_getarg, NULL, gfc_resolve_getarg,
 	      pos, BT_INTEGER, di, REQUIRED, val, BT_CHARACTER, dc, REQUIRED);
 
-  add_sym_1s ("getlog", GFC_ISYM_GETLOG, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_getlog, NULL, gfc_resolve_getlog, c, BT_CHARACTER,
-	      dc, REQUIRED);
+  add_sym_1s ("getlog", GFC_ISYM_GETLOG, CLASS_IMPURE, BT_UNKNOWN,
+	      0, GFC_STD_GNU, gfc_check_getlog, NULL, gfc_resolve_getlog,
+	      c, BT_CHARACTER, dc, REQUIRED);
 
   /* F2003 commandline routines.  */
 
-  add_sym_3s_intent ("get_command", GFC_ISYM_GET_COMMAND, NO_CLASS, BT_UNKNOWN,
-		     0, GFC_STD_F2003, NULL, NULL, gfc_resolve_get_command,
+  add_sym_3s_intent ("get_command", GFC_ISYM_GET_COMMAND, CLASS_IMPURE,
+		     BT_UNKNOWN, 0, GFC_STD_F2003,
+		     NULL, NULL, gfc_resolve_get_command,
 		     com, BT_CHARACTER, dc, OPTIONAL, INTENT_OUT,
 		     length, BT_INTEGER, di, OPTIONAL, INTENT_OUT,
 		     st, BT_INTEGER, di, OPTIONAL, INTENT_OUT);
 
-  add_sym_4s ("get_command_argument", GFC_ISYM_GET_COMMAND_ARGUMENT, NO_CLASS,
-	      BT_UNKNOWN, 0, GFC_STD_F2003, NULL, NULL,
+  add_sym_4s ("get_command_argument", GFC_ISYM_GET_COMMAND_ARGUMENT,
+	      CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_F2003, NULL, NULL,
 	      gfc_resolve_get_command_argument,
 	      num, BT_INTEGER, di, REQUIRED, INTENT_IN,
 	      val, BT_CHARACTER, dc, OPTIONAL, INTENT_OUT,
@@ -2784,7 +2791,7 @@ add_subroutines (void)
   /* F2003 subroutine to get environment variables.  */
 
   add_sym_5s ("get_environment_variable", GFC_ISYM_GET_ENVIRONMENT_VARIABLE,
-	      NO_CLASS, BT_UNKNOWN, 0, GFC_STD_F2003,
+	      CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_F2003,
 	      NULL, NULL, gfc_resolve_get_environment_variable,
 	      name, BT_CHARACTER, dc, REQUIRED, INTENT_IN,
 	      val, BT_CHARACTER, dc, OPTIONAL, INTENT_OUT,
@@ -2792,8 +2799,9 @@ add_subroutines (void)
 	      st, BT_INTEGER, di, OPTIONAL, INTENT_OUT,
 	      trim_name, BT_LOGICAL, dl, OPTIONAL, INTENT_IN);
 
-  add_sym_2s_intent ("move_alloc", GFC_ISYM_MOVE_ALLOC, NO_CLASS, BT_UNKNOWN, 0,
-		     GFC_STD_F2003, gfc_check_move_alloc, NULL, NULL,
+  add_sym_2s_intent ("move_alloc", GFC_ISYM_MOVE_ALLOC, CLASS_PURE,
+		     BT_UNKNOWN, 0, GFC_STD_F2003,
+		     gfc_check_move_alloc, NULL, NULL,
 		     f, BT_UNKNOWN, 0, REQUIRED, INTENT_INOUT,
 		     t, BT_UNKNOWN, 0, REQUIRED, INTENT_OUT);
 
@@ -2806,12 +2814,12 @@ add_subroutines (void)
 	      t, BT_INTEGER, di, REQUIRED, INTENT_INOUT,
 	      tp, BT_INTEGER, di, REQUIRED, INTENT_IN);
 
-  add_sym_1s_intent ("random_number", GFC_ISYM_RANDOM_NUMBER, NO_CLASS,
+  add_sym_1s_intent ("random_number", GFC_ISYM_RANDOM_NUMBER, CLASS_IMPURE,
 		     BT_UNKNOWN, 0, GFC_STD_F95, gfc_check_random_number, NULL,
 		     gfc_resolve_random_number,
 		     h, BT_REAL, dr, REQUIRED, INTENT_OUT);
 
-  add_sym_3s_intent ("random_seed", GFC_ISYM_RANDOM_SEED, NO_CLASS,
+  add_sym_3s_intent ("random_seed", GFC_ISYM_RANDOM_SEED, CLASS_IMPURE,
 		     BT_UNKNOWN, 0, GFC_STD_F95,
 		     gfc_check_random_seed, NULL, gfc_resolve_random_seed,
 		     sz, BT_INTEGER, di, OPTIONAL, INTENT_OUT,
@@ -2819,130 +2827,131 @@ add_subroutines (void)
 		     gt, BT_INTEGER, di, OPTIONAL, INTENT_OUT);
 
   /* More G77 compatibility garbage.  */
-  add_sym_3s ("alarm", GFC_ISYM_ALARM, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_3s ("alarm", GFC_ISYM_ALARM, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_alarm_sub, NULL, gfc_resolve_alarm_sub,
 	      sec, BT_INTEGER, di, REQUIRED, han, BT_UNKNOWN, 0, REQUIRED,
 	      st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_1s ("srand", GFC_ISYM_SRAND, NO_CLASS, BT_UNKNOWN, di, GFC_STD_GNU,
-	      gfc_check_srand, NULL, gfc_resolve_srand,
+  add_sym_1s ("srand", GFC_ISYM_SRAND, CLASS_IMPURE, BT_UNKNOWN,
+	      di, GFC_STD_GNU, gfc_check_srand, NULL, gfc_resolve_srand,
 	      "seed", BT_INTEGER, 4, REQUIRED);
 
-  add_sym_1s ("exit", GFC_ISYM_EXIT, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_1s ("exit", GFC_ISYM_EXIT, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_exit, NULL, gfc_resolve_exit,
 	      st, BT_INTEGER, di, OPTIONAL);
 
   make_noreturn();
 
-  add_sym_3s ("fgetc", GFC_ISYM_FGETC, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_3s ("fgetc", GFC_ISYM_FGETC, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_fgetputc_sub, NULL, gfc_resolve_fgetc_sub,
 	      ut, BT_INTEGER, di, REQUIRED, c, BT_CHARACTER, dc, REQUIRED,
 	      st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_2s ("fget", GFC_ISYM_FGET, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_2s ("fget", GFC_ISYM_FGET, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_fgetput_sub, NULL, gfc_resolve_fget_sub,
 	      c, BT_CHARACTER, dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_1s ("flush", GFC_ISYM_FLUSH, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_1s ("flush", GFC_ISYM_FLUSH, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_flush, NULL, gfc_resolve_flush,
 	      ut, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_3s ("fputc", GFC_ISYM_FPUTC, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_3s ("fputc", GFC_ISYM_FPUTC, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_fgetputc_sub, NULL, gfc_resolve_fputc_sub,
 	      ut, BT_INTEGER, di, REQUIRED, c, BT_CHARACTER, dc, REQUIRED,
 	      st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_2s ("fput", GFC_ISYM_FPUT, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_2s ("fput", GFC_ISYM_FPUT, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_fgetput_sub, NULL, gfc_resolve_fput_sub,
 	      c, BT_CHARACTER, dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_1s ("free", GFC_ISYM_FREE, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_1s ("free", GFC_ISYM_FREE, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_free, NULL, gfc_resolve_free,
 	      ptr, BT_INTEGER, ii, REQUIRED);
 
-  add_sym_4s ("fseek", GFC_ISYM_FSEEK, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-              gfc_check_fseek_sub, NULL, gfc_resolve_fseek_sub,
-              ut, BT_INTEGER, di, REQUIRED, INTENT_IN,
+  add_sym_4s ("fseek", GFC_ISYM_FSEEK, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
+	      gfc_check_fseek_sub, NULL, gfc_resolve_fseek_sub,
+	      ut, BT_INTEGER, di, REQUIRED, INTENT_IN,
 	      of, BT_INTEGER, di, REQUIRED, INTENT_IN,
-              whence, BT_INTEGER, di, REQUIRED, INTENT_IN,
+	      whence, BT_INTEGER, di, REQUIRED, INTENT_IN,
 	      st, BT_INTEGER, di, OPTIONAL, INTENT_OUT);
 
-  add_sym_2s ("ftell", GFC_ISYM_FTELL, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_2s ("ftell", GFC_ISYM_FTELL, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_ftell_sub, NULL, gfc_resolve_ftell_sub,
 	      ut, BT_INTEGER, di, REQUIRED, of, BT_INTEGER, ii, REQUIRED);
 
-  add_sym_2s ("hostnm", GFC_ISYM_HOSTNM, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_hostnm_sub, NULL, gfc_resolve_hostnm_sub,
+  add_sym_2s ("hostnm", GFC_ISYM_HOSTNM, CLASS_IMPURE, BT_UNKNOWN, 0,
+	      GFC_STD_GNU, gfc_check_hostnm_sub, NULL, gfc_resolve_hostnm_sub,
 	      c, BT_CHARACTER, dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_3s ("kill", GFC_ISYM_KILL, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU, gfc_check_kill_sub,
+  add_sym_3s ("kill", GFC_ISYM_KILL, CLASS_IMPURE, BT_UNKNOWN,
+	      0, GFC_STD_GNU, gfc_check_kill_sub,
 	      NULL, gfc_resolve_kill_sub, c, BT_INTEGER, di, REQUIRED,
 	      val, BT_INTEGER, di, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_3s ("link", GFC_ISYM_LINK, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_3s ("link", GFC_ISYM_LINK, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_link_sub, NULL, gfc_resolve_link_sub,
 	      p1, BT_CHARACTER, dc, REQUIRED, p2, BT_CHARACTER,
 	      dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_1s ("perror", GFC_ISYM_PERROR, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_perror, NULL, gfc_resolve_perror,
+  add_sym_1s ("perror", GFC_ISYM_PERROR, CLASS_IMPURE, BT_UNKNOWN,
+	      0, GFC_STD_GNU, gfc_check_perror, NULL, gfc_resolve_perror,
 	      "string", BT_CHARACTER, dc, REQUIRED);
 
-  add_sym_3s ("rename", GFC_ISYM_RENAME, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_rename_sub, NULL, gfc_resolve_rename_sub,
+  add_sym_3s ("rename", GFC_ISYM_RENAME, CLASS_IMPURE, BT_UNKNOWN, 0,
+	      GFC_STD_GNU, gfc_check_rename_sub, NULL, gfc_resolve_rename_sub,
 	      p1, BT_CHARACTER, dc, REQUIRED, p2, BT_CHARACTER,
 	      dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_1s ("sleep", GFC_ISYM_SLEEP, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_1s ("sleep", GFC_ISYM_SLEEP, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_sleep_sub, NULL, gfc_resolve_sleep_sub,
 	      sec, BT_INTEGER, di, REQUIRED);
 
-  add_sym_3s ("fstat", GFC_ISYM_FSTAT, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_3s ("fstat", GFC_ISYM_FSTAT, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_fstat_sub, NULL, gfc_resolve_fstat_sub,
 	      ut, BT_INTEGER, di, REQUIRED, vl, BT_INTEGER, di, REQUIRED,
 	      st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_3s ("lstat", GFC_ISYM_LSTAT, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_3s ("lstat", GFC_ISYM_LSTAT, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_stat_sub, NULL, gfc_resolve_lstat_sub,
 	      name, BT_CHARACTER, dc, REQUIRED, vl, BT_INTEGER, di, REQUIRED,
 	      st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_3s ("stat", GFC_ISYM_STAT, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_3s ("stat", GFC_ISYM_STAT, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_stat_sub, NULL, gfc_resolve_stat_sub,
 	      name, BT_CHARACTER, dc, REQUIRED, vl, BT_INTEGER, di, REQUIRED,
 	      st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_3s ("signal", GFC_ISYM_SIGNAL, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_signal_sub, NULL, gfc_resolve_signal_sub,
+  add_sym_3s ("signal", GFC_ISYM_SIGNAL, CLASS_IMPURE, BT_UNKNOWN, 0,
+	      GFC_STD_GNU, gfc_check_signal_sub, NULL, gfc_resolve_signal_sub,
 	      num, BT_INTEGER, di, REQUIRED, han, BT_UNKNOWN, 0, REQUIRED,
 	      st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_3s ("symlnk", GFC_ISYM_SYMLINK, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_symlnk_sub, NULL, gfc_resolve_symlnk_sub,
+  add_sym_3s ("symlnk", GFC_ISYM_SYMLINK, CLASS_IMPURE, BT_UNKNOWN, 0,
+	      GFC_STD_GNU, gfc_check_symlnk_sub, NULL, gfc_resolve_symlnk_sub,
 	      p1, BT_CHARACTER, dc, REQUIRED, p2, BT_CHARACTER,
 	      dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_2s ("system", GFC_ISYM_SYSTEM, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      NULL, NULL, gfc_resolve_system_sub,
+  add_sym_2s ("system", GFC_ISYM_SYSTEM, CLASS_IMPURE, BT_UNKNOWN,
+	      0, GFC_STD_GNU, NULL, NULL, gfc_resolve_system_sub,
 	      com, BT_CHARACTER, dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_3s_intent ("system_clock", GFC_ISYM_SYSTEM_CLOCK, NO_CLASS,
+  add_sym_3s_intent ("system_clock", GFC_ISYM_SYSTEM_CLOCK, CLASS_IMPURE,
 		     BT_UNKNOWN, 0, GFC_STD_F95,
 		     gfc_check_system_clock, NULL, gfc_resolve_system_clock,
 		     c, BT_INTEGER, di, OPTIONAL, INTENT_OUT,
 		     cr, BT_INTEGER, di, OPTIONAL, INTENT_OUT,
 		     cm, BT_INTEGER, di, OPTIONAL, INTENT_OUT);
 
-  add_sym_2s ("ttynam", GFC_ISYM_TTYNAM, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_ttynam_sub, NULL, gfc_resolve_ttynam_sub,
+  add_sym_2s ("ttynam", GFC_ISYM_TTYNAM, CLASS_IMPURE, BT_UNKNOWN, 0,
+	      GFC_STD_GNU, gfc_check_ttynam_sub, NULL, gfc_resolve_ttynam_sub,
 	      ut, BT_INTEGER, di, REQUIRED, name, BT_CHARACTER, dc, REQUIRED);
 
-  add_sym_2s ("umask", GFC_ISYM_UMASK, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
+  add_sym_2s ("umask", GFC_ISYM_UMASK, CLASS_IMPURE, BT_UNKNOWN, 0, GFC_STD_GNU,
 	      gfc_check_umask_sub, NULL, gfc_resolve_umask_sub,
 	      msk, BT_INTEGER, di, REQUIRED, old, BT_INTEGER, di, OPTIONAL);
 
-  add_sym_2s ("unlink", GFC_ISYM_UNLINK, NO_CLASS, BT_UNKNOWN, 0, GFC_STD_GNU,
-	      gfc_check_unlink_sub, NULL, gfc_resolve_unlink_sub,
+  add_sym_2s ("unlink", GFC_ISYM_UNLINK, CLASS_IMPURE, BT_UNKNOWN, 0,
+	      GFC_STD_GNU, gfc_check_unlink_sub, NULL, gfc_resolve_unlink_sub,
 	      "path", BT_CHARACTER, dc, REQUIRED, st, BT_INTEGER, di, OPTIONAL);
 }