Warn about invoking non-Y2K-compliant intrinsics

From-SVN: r25609

16 files changed, 278 insertions, 21 deletions

diff --git a/gcc/f/ChangeLog b/gcc/f/ChangeLog
index 0eb4cdc..3db76df 100644
--- a/gcc/f/ChangeLog
+++ b/gcc/f/ChangeLog
@@ -1,3 +1,22 @@
+Sat Mar  6 02:28:35 1999  Craig Burley  <craig@jcb-sc.com>
+
+	Warn about non-Y2K-compliant intrinsics:
+	* bad.def (FFEBAD_INTRINSIC_Y2KBAD): New diagnostic.
+	* intrin.def (FFEINTRIN_impDATE, FFEINTRIN_impIDATE_vxt):
+	Use new DEFIMPY macro to flag these as non-Y2K-compliant.
+	* intdoc.c (DEFIMPY): Support new Y2K macro.
+	* intrin.h (DEFIMPY): Ditto.
+	* intrin.c (DEFIMPY): Ditto.
+	(ffeintrin_fulfill_generic, ffeintrin_fulfill_specific):
+	Warn about invocation of non-Y2K-compliant intrinsic.
+	* com-rt.def (FFECOM_gfrtDATE, FFECOM_gfrtVXTIDATE):
+	Rename external procedure names, to keep previously-
+	compiled (sans-new-warnings) code from linking to
+	new library.
+	* g77.texi: Document all this stuff.
+	* news.texi: Spread the joy.
+	* version.c: Bump version.
+
 Fri Mar  5 13:22:44 1999  Craig Burley  <craig@jcb-sc.com>
 
 	* news.texi: Relocate IDATE (VXT) fix: we put it in 1.1.2
diff --git a/gcc/f/bad.def b/gcc/f/bad.def
index 6d96110..430c283 100644
--- a/gcc/f/bad.def
+++ b/gcc/f/bad.def
@@ -700,6 +700,8 @@ FFEBAD_MSGS1 (FFEBAD_ARRAY_LARGE, FATAL,
 "Array `%A' at %0 is too large to handle")
 FFEBAD_MSGS1 (FFEBAD_SFUNC_UNUSED, WARN,
 "Statement function `%A' defined at %0 is not used")
+FFEBAD_MSGS1 (FFEBAD_INTRINSIC_Y2KBAD, WARN,
+"Intrinsic `%A', invoked at %0, known to be non-Y2K-compliant [info -f g77 M Y2KBAD]")
 
 #undef INFORM
 #undef TRIVIAL
diff --git a/gcc/f/com-rt.def b/gcc/f/com-rt.def
index 8364457..5c08fee 100644
--- a/gcc/f/com-rt.def
+++ b/gcc/f/com-rt.def
@@ -142,7 +142,7 @@ DEFGFRT (FFECOM_gfrtDACOS, "d_acos", FFECOM_rttypeDOUBLE_, "&d", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtDASIN, "d_asin", FFECOM_rttypeDOUBLE_, "&d", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtDATAN, "d_atan", FFECOM_rttypeDOUBLE_, "&d", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtDATAN2, "d_atn2", FFECOM_rttypeDOUBLE_, "&d", FALSE, FALSE)
-DEFGFRT (FFECOM_gfrtDATE, "G77_date_0", FFECOM_rttypeVOID_, "&a", FALSE, FALSE)
+DEFGFRT (FFECOM_gfrtDATE, "G77_date_y2kbug_0", FFECOM_rttypeVOID_, "&a", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtDATE_AND_TIME, "G77_date_and_time_0", FFECOM_rttypeVOID_, "&a&a&a&i", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtL_BESJ0, "j0", FFECOM_rttypeDOUBLE_, "d", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtL_BESJ1, "j1", FFECOM_rttypeDOUBLE_, "d", FALSE, FALSE)
@@ -242,7 +242,7 @@ DEFGFRT (FFECOM_gfrtTIME, "G77_time_0", FFECOM_rttypeLONGINT_, 0, FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtTTYNAM, "G77_ttynam_0", FFECOM_rttypeCHARACTER_, "&i", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtUNLINK, "G77_unlink_0", FFECOM_rttypeINTEGER_, "&a", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtUMASK, "G77_umask_0", FFECOM_rttypeINTEGER_, "&i", FALSE, FALSE)
-DEFGFRT (FFECOM_gfrtVXTIDATE, "G77_vxtidate_0", FFECOM_rttypeVOID_, "&i&i&i", FALSE, FALSE)
+DEFGFRT (FFECOM_gfrtVXTIDATE, "G77_vxtidate_y2kbug_0", FFECOM_rttypeVOID_, "&i&i&i", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtVXTTIME, "G77_vxttime_0", FFECOM_rttypeVOID_, "&a", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtCDABS, "z_abs", FFECOM_rttypeDOUBLE_, "&e", FALSE, FALSE)
 DEFGFRT (FFECOM_gfrtCDCOS, "z_cos", FFECOM_rttypeDBLCMPLX_F2C_, "&e", FALSE, TRUE)
diff --git a/gcc/f/g77.texi b/gcc/f/g77.texi
index febe727..9997fa2 100644
--- a/gcc/f/g77.texi
+++ b/gcc/f/g77.texi
@@ -14,7 +14,7 @@
 @c %**start of header
 @setfilename g77.info
 
-@set last-up-date 1999-03-03
+@set last-up-date 1999-03-06
 @set version-g77 0.5.24
 @set email-general egcs@@egcs.cygnus.com
 @set email-bugs egcs-bugs@@egcs.cygnus.com
@@ -8145,6 +8145,119 @@ on at least some systems:
 @ref{Date Intrinsic},
 @ref{IDate Intrinsic (VXT)}.
 
+@cindex y2kbuggy
+@cindex date_y2kbuggy_0
+@cindex vxtidate_y2kbuggy_0
+@cindex G77_date_y2kbuggy_0
+@cindex G77_vxtidate_y2kbuggy_0
+The @code{libg2c} library
+shipped with any @code{g77} that warns
+about invocation of a non-Y2K-compliant intrinsic
+has renamed the @samp{EXTERNAL} procedure names
+of those intrinsics.
+This is done so that
+the @code{libg2c} implementations of these intrinsics
+cannot be directly linked to
+as @samp{EXTERNAL} names
+(which normally would avoid the non-Y2K-intrinsic warning).
+
+The renamed forms of the @samp{EXTERNAL} names
+of these renamed procedures
+may be linked to
+by appending the string @samp{_y2kbug}
+to the name of the procedure
+in the source code.
+For example:
+
+@smallexample
+CHARACTER*20 STR
+INTEGER YY, MM, DD
+EXTERNAL DATE_Y2KBUG, VXTIDATE_Y2KBUG
+CALL DATE_Y2KBUG (STR)
+CALL VXTIDATE_Y2KBUG (MM, DD, YY)
+@end smallexample
+
+(Note that the @samp{EXTERNAL} statement
+is not actually required,
+since the modified names are not recognized as intrinsics
+by the current version of @code{g77}.
+But it is shown in this specific case,
+for purposes of illustration.)
+
+The renaming of @samp{EXTERNAL} procedure names of these intrinsics
+causes unresolved references at link time.
+For example, @samp{EXTERNAL DATE; CALL DATE(STR)}
+is normally compiled by @code{g77}
+as, in C, @samp{date_(&str, 20);}.
+This, in turn, links to the @samp{date_} procedure
+in the @samp{libE77} portion of @code{libg2c},
+which purposely calls a nonexistent procedure
+named @samp{G77_date_y2kbuggy_0}.
+The resulting link-time error is designed, via this name,
+to encourage the programmer to look up the
+index entries to this portion of the @code{g77} documentation.
+
+Generally, we recommend that the @samp{EXTERNAL} method
+of invoking procedures in @code{libg2c}
+@emph{not} be used.
+When used, some of the correctness checking
+normally performed by @code{g77}
+is skipped.
+
+In particular, it is probably better to use the
+@samp{INTRINSIC} method of invoking
+non-Y2K-compliant procedures,
+so anyone compiling the code
+can quickly notice the potential Y2K problems
+(via the warnings printing by @code{g77})
+without having to even look at the code itself.
+
+If there are problems linking @code{libg2c}
+to code compiled by @code{g77}
+that involve the string @samp{y2kbug},
+and these are not explained above,
+that probably indicates
+that a version of @code{libg2c}
+older than @code{g77}
+is being linked to,
+or that the new library is being linked
+to code compiled by an older version of @code{g77}.
+
+That's because, as of the version that warns about
+non-Y2K-compliant intrinsic invocation,
+@code{g77} references the @code{libg2c} implementations
+of those intrinsics
+using new names, containing the string @samp{y2kbug}.
+
+So, linking newly-compiled code
+(invoking one of the intrinsics in question)
+to an old library
+might yield an unresolved reference
+to @samp{G77_date_y2kbug_0}.
+(The old library calls it @samp{G77_date_0}.)
+
+Similarly, linking previously-compiled code
+to a new library
+might yield an unresolved reference
+to @samp{G77_vxtidate_0}.
+(The new library calls it @samp{G77_vxtidate_y2kbug_0}.)
+
+The proper fix for the above problems
+is to obtain the latest release of @code{g77}
+and related products
+(including @code{libg2c})
+and install them on all systems,
+then recompile, relink, and install
+(as appropriate)
+all existing Fortran programs.
+
+(Normally, this sort of renaming is steadfastly avoided.
+In this case, however, it seems more important to highlight
+potential Y2K problems
+than to ease the transition
+of potentially non-Y2K-compliant code
+to new versions of @code{g77} and @code{libg2c}.)
+
 @node Array Size
 @subsection Array Size
 @cindex limits, array size
@@ -14756,6 +14869,7 @@ as the above is just a sample, no such section exists.
 * LEX::         Various lexer messages
 * GLOBALS::     Disagreements about globals.
 * LINKFAIL::    When linking @samp{f771} fails.
+* Y2KBAD::      Use of non-Y2K-compliant intrinsic.
 @end menu
 
 @node CMPAMBIG
@@ -15327,6 +15441,24 @@ might solve this problem, e.g.@: by adding
 BOOT_CFLAGS='-mminimal-toc -O2 -g'
 @end smallexample
 to the @code{make bootstrap} command line.
+
+@node Y2KBAD
+@section @code{Y2KBAD}
+@cindex Y2K compliance
+@cindex Year 2000 compliance
+
+@noindent
+@smallexample
+Intrinsic `@var{name}', invoked at (^), known to be non-Y2K-compliant@dots{}
+@end smallexample
+
+This diagnostic indicates that
+the specific intrinsic invoked by the name @var{name}
+is known to have an interface
+that is not Year-2000 (Y2K) compliant.
+
+@xref{Year 2000 (Y2K) Problems}.
+
 @end ifset
 
 @node Index
diff --git a/gcc/f/intdoc.c b/gcc/f/intdoc.c
index e4f45ca..917fc2e 100644
--- a/gcc/f/intdoc.c
+++ b/gcc/f/intdoc.c
@@ -124,11 +124,13 @@ static struct _ffeintrin_name_ names[] = {
 #define DEFGEN(CODE,NAME,SPEC1,SPEC2)
 #define DEFSPEC(CODE,NAME,CALLABLE,FAMILY,IMP)
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL)
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD)
 #include "intrin.def"
 #undef DEFNAME
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
 };
 
 static struct _ffeintrin_gen_ gens[] = {
@@ -137,11 +139,13 @@ static struct _ffeintrin_gen_ gens[] = {
   { NAME, { SPEC1, SPEC2, }, },
 #define DEFSPEC(CODE,NAME,CALLABLE,FAMILY,IMP)
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL)
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD)
 #include "intrin.def"
 #undef DEFNAME
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
 };
 
 static struct _ffeintrin_imp_ imps[] = {
@@ -151,9 +155,13 @@ static struct _ffeintrin_imp_ imps[] = {
 #if 0	/* FFECOM_targetCURRENT == FFECOM_targetGCC */
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL) \
   { NAME, FFECOM_gfrt ## GFRT, CONTROL },
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD) \
+  { NAME, FFECOM_gfrt ## GFRT, CONTROL },
 #elif 1	/* FFECOM_targetCURRENT == FFECOM_targetFFE */
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL) \
   { NAME, CONTROL },
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD) \
+  { NAME, CONTROL },
 #else
 #error
 #endif
@@ -162,6 +170,7 @@ static struct _ffeintrin_imp_ imps[] = {
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
 };
 
 static struct _ffeintrin_spec_ specs[] = {
@@ -170,10 +179,12 @@ static struct _ffeintrin_spec_ specs[] = {
 #define DEFSPEC(CODE,NAME,CALLABLE,FAMILY,IMP) \
   { NAME, CALLABLE, FAMILY, IMP, },
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL)
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD)
 #include "intrin.def"
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
 };
 
 struct cc_pair { ffeintrinImp imp; char *text; };
diff --git a/gcc/f/intrin.c b/gcc/f/intrin.c
index c018b5c..6760be4 100644
--- a/gcc/f/intrin.c
+++ b/gcc/f/intrin.c
@@ -64,6 +64,7 @@ struct _ffeintrin_imp_
     ffecomGfrt gfrt_gnu;	/* library routine, gnu-callable form. */
 #endif	/* FFECOM_targetCURRENT == FFECOM_targetGCC */
     char *control;
+    char y2kbad;
   };
 
 static ffebad ffeintrin_check_ (ffeintrinImp imp, ffebldOp op,
@@ -84,11 +85,13 @@ static struct _ffeintrin_name_ ffeintrin_names_[]
 #define DEFGEN(CODE,NAME,SPEC1,SPEC2)
 #define DEFSPEC(CODE,NAME,CALLABLE,FAMILY,IMP)
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL)
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD)
 #include "intrin.def"
 #undef DEFNAME
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
 };
 
 static struct _ffeintrin_gen_ ffeintrin_gens_[]
@@ -99,11 +102,13 @@ static struct _ffeintrin_gen_ ffeintrin_gens_[]
   { NAME, { SPEC1, SPEC2, }, },
 #define DEFSPEC(CODE,NAME,CALLABLE,FAMILY,IMP)
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL)
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD)
 #include "intrin.def"
 #undef DEFNAME
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
 };
 
 static struct _ffeintrin_imp_ ffeintrin_imps_[]
@@ -115,10 +120,15 @@ static struct _ffeintrin_imp_ ffeintrin_imps_[]
 #if FFECOM_targetCURRENT == FFECOM_targetGCC
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL) \
       { NAME, FFECOM_gfrt ## GFRTDIRECT, FFECOM_gfrt ## GFRTF2C, \
-	FFECOM_gfrt ## GFRTGNU, CONTROL },
+	FFECOM_gfrt ## GFRTGNU, CONTROL, FALSE },
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD) \
+      { NAME, FFECOM_gfrt ## GFRTDIRECT, FFECOM_gfrt ## GFRTF2C, \
+	FFECOM_gfrt ## GFRTGNU, CONTROL, Y2KBAD },
 #elif FFECOM_targetCURRENT == FFECOM_targetFFE
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL) \
-      { NAME, CONTROL },
+      { NAME, CONTROL, FALSE },
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD) \
+      { NAME, CONTROL, Y2KBAD },
 #else
 #error
 #endif
@@ -127,6 +137,7 @@ static struct _ffeintrin_imp_ ffeintrin_imps_[]
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
 };
 
 static struct _ffeintrin_spec_ ffeintrin_specs_[]
@@ -137,10 +148,12 @@ static struct _ffeintrin_spec_ ffeintrin_specs_[]
 #define DEFSPEC(CODE,NAME,CALLABLE,FAMILY,IMP) \
   { NAME, CALLABLE, FAMILY, IMP, },
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL)
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD)
 #include "intrin.def"
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
 };
 
 
@@ -1374,6 +1387,14 @@ ffeintrin_fulfill_generic (ffebld *expr, ffeinfo *info, ffelexToken t)
 	  ffebad_string (ffeintrin_gens_[gen].name);
 	  ffebad_finish ();
 	}
+      if (ffeintrin_imps_[imp].y2kbad)
+	{
+	  ffebad_start (FFEBAD_INTRINSIC_Y2KBAD);
+	  ffebad_here (0, ffelex_token_where_line (t),
+		       ffelex_token_where_column (t));
+	  ffebad_string (ffeintrin_gens_[gen].name);
+	  ffebad_finish ();
+	}
     }
 }
 
@@ -1489,6 +1510,14 @@ ffeintrin_fulfill_specific (ffebld *expr, ffeinfo *info,
 	  ffebad_string (name);
 	  ffebad_finish ();
 	}
+      if (ffeintrin_imps_[imp].y2kbad)
+	{
+	  ffebad_start (FFEBAD_INTRINSIC_Y2KBAD);
+	  ffebad_here (0, ffelex_token_where_line (t),
+		       ffelex_token_where_column (t));
+	  ffebad_string (name);
+	  ffebad_finish ();
+	}
     }
 }
 
diff --git a/gcc/f/intrin.def b/gcc/f/intrin.def
index 93df3f1..9d9626b 100644
--- a/gcc/f/intrin.def
+++ b/gcc/f/intrin.def
@@ -3006,6 +3006,12 @@ DEFSPEC (NONE,
 
    CONTROL    -- A control string, described below.
 
+   The DEFIMPY macro specifies the above, plus:
+
+   Y2KBAD     -- TRUE if the intrinsic is known to be non-Y2K-compliant,
+                 FALSE if it is known to be Y2K-compliant.  (In terms of
+                 interface and libg2c implementation.)
+
 */
 
 /* The control string has the following format:
@@ -3232,7 +3238,7 @@ DEFIMP	(COMPLEX,	"COMPLEX",	,,,		"C=:*:Real=S*,Imag=S*")
 DEFIMP	(CPU_TIME,	"CPU_TIME",	SECOND,,,	"--:-:Seconds=R*w")
 DEFIMP	(CTIME_func,	"CTIME_func",	CTIME,,,	"A1*:-:STime=I*")
 DEFIMP	(CTIME_subr,	"CTIME_subr",	CTIME,,,	"--:-:Result=A1w,STime=I*")
-DEFIMP	(DATE,		"DATE",		DATE,,,		"--:-:Date=A1w")
+DEFIMPY	(DATE,		"DATE",		DATE,,,		"--:-:Date=A1w",	TRUE)
 DEFIMP	(DATE_AND_TIME,	"DATE_AND_TIME", DATE_AND_TIME,,, "--:-:Date=A1w,Time=?A1w,Zone=?A1w,Values=?I1(8)w")
 DEFIMP	(DBESJ0,	"DBESJ0",	L_BESJ0,,,	"R2:-:X=R2")
 DEFIMP	(DBESJ1,	"DBESJ1",	L_BESJ1,,,	"R2:-:X=R2")
@@ -3289,7 +3295,7 @@ DEFIMP	(IBCLR,		"IBCLR",	,,,		"I=:0:I=I*,Pos=I*")
 DEFIMP	(IBITS,		"IBITS",	,,,		"I=:0:I=I*,Pos=I*,Len=I*")
 DEFIMP	(IBSET,		"IBSET",	,,,		"I=:0:I=I*,Pos=I*")
 DEFIMP	(IDATE_unix,	"IDATE_unix",	IDATE,,,	"--:-:TArray=I1(3)w")
-DEFIMP	(IDATE_vxt,	"IDATE_vxt",	VXTIDATE,,,	"--:-:M=I1w,D=I1w,Y=I1w")
+DEFIMPY	(IDATE_vxt,	"IDATE_vxt",	VXTIDATE,,,	"--:-:M=I1w,D=I1w,Y=I1w",	TRUE)
 DEFIMP	(IEOR,		"IEOR",		,,,		"I=:*:I=I*,J=I*")
 DEFIMP	(IOR,		"IOR",		,,,		"I=:*:I=I*,J=I*")
 DEFIMP	(IERRNO,	"IERRNO",	IERRNO,,,	"I1:-:")
diff --git a/gcc/f/intrin.h b/gcc/f/intrin.h
index 0fb156b..393552d 100644
--- a/gcc/f/intrin.h
+++ b/gcc/f/intrin.h
@@ -51,11 +51,13 @@ typedef enum
 #define DEFGEN(CODE,NAME,SPEC1,SPEC2) FFEINTRIN_gen ## CODE,
 #define DEFSPEC(CODE,NAME,CALLABLE,FAMILY,IMP)
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL)
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD)
 #include "intrin.def"
 #undef DEFNAME
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
     FFEINTRIN_gen
   } ffeintrinGen;
 
@@ -65,11 +67,13 @@ typedef enum
 #define DEFGEN(CODE,NAME,SPEC1,SPEC2)
 #define DEFSPEC(CODE,NAME,CALLABLE,FAMILY,IMP) FFEINTRIN_spec ## CODE,
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL)
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD)
 #include "intrin.def"
 #undef DEFNAME
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
     FFEINTRIN_spec
   } ffeintrinSpec;
 
@@ -80,11 +84,14 @@ typedef enum
 #define DEFSPEC(CODE,NAME,CALLABLE,FAMILY,IMP)
 #define DEFIMP(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL) \
     FFEINTRIN_imp ## CODE,
+#define DEFIMPY(CODE,NAME,GFRTDIRECT,GFRTF2C,GFRTGNU,CONTROL,Y2KBAD) \
+    FFEINTRIN_imp ## CODE,
 #include "intrin.def"
 #undef DEFNAME
 #undef DEFGEN
 #undef DEFSPEC
 #undef DEFIMP
+#undef DEFIMPY
     FFEINTRIN_imp
   } ffeintrinImp;
 
diff --git a/gcc/f/news.texi b/gcc/f/news.texi
index 632fe95..a460fe0 100644
--- a/gcc/f/news.texi
+++ b/gcc/f/news.texi
@@ -9,7 +9,7 @@
 @c The text of this file appears in the file BUGS
 @c in the G77 distribution, as well as in the G77 manual.
 
-@c 1999-03-03
+@c 1999-03-06
 
 @ifclear NEWSONLY
 @node News
@@ -82,6 +82,16 @@ now are recognized by @code{g77}
 as if they ended in @samp{.for} and @samp{.fpp}, respectively.
 
 @item
+@code{g77} now warns about a reference to an intrinsic
+that has an interface that is not Year 2000 (Y2K) compliant.
+Also, the @code{libg2c} has been changed to increase the likelihood
+of catching references to the implementations of these intrinsics
+using the @samp{EXTERNAL} mechanism
+(which would avoid the new warnings).
+
+@xref{Year 2000 (Y2K) Problems}, for more information.
+
+@item
 @code{g77} now warns about a reference to a function
 when the corresponding @emph{subsequent} function program unit
 disagrees with the reference concerning the type of the function.
diff --git a/gcc/f/version.c b/gcc/f/version.c
index 24c6c68..8faaa02 100644
--- a/gcc/f/version.c
+++ b/gcc/f/version.c
@@ -1 +1 @@
-char *ffe_version_string = "0.5.24-19990219";
+char *ffe_version_string = "0.5.24-19990306";
diff --git a/libf2c/ChangeLog b/libf2c/ChangeLog
index 55300b0..c070e3a 100644
--- a/libf2c/ChangeLog
+++ b/libf2c/ChangeLog
@@ -1,3 +1,17 @@
+1999-03-06  Craig Burley  <craig@jcb-sc.com>
+
+	Rename non-Y2K-compliant intrinsics:
+	* Makefile.in (F2CEXT): Now two versions each of
+	`date' and `vxtidt'.
+	* f2cext.c (date_, vxtidate_): Split into two versions,
+	the existing one calling a new "y2kbuggy" routine that
+	does not exist, and a new one named with "y2kbug" that
+	calls the newly renamed underlying routine.
+	* libU77/date_.c (G77_date_y2kbug_0): Rename from G77_date_0.
+	* libU77/vxtidate_.c (G77_vxtidate_y2kbug_0): Rename from
+	G77_vxtidate_0.
+	* libU77/Version.c: Bump version.
+
 1999-03-03  Craig Burley  <craig@jcb-sc.com>
 
 	* libU77/vxtidate_.c (G77_vxtidate_0): Truncate
diff --git a/libf2c/Makefile.in b/libf2c/Makefile.in
index 3b52019..7c8d880 100644
--- a/libf2c/Makefile.in
+++ b/libf2c/Makefile.in
@@ -75,12 +75,13 @@ SUBDIRS = libI77 libF77 libU77
 
 F2CEXT = abort derf derfc ef1asc ef1cmc erf erfc exit getarg getenv iargc \
 	signal system flush ftell fseek access besj0 besj1 besjn besy0 besy1 \
-	besyn chdir chmod ctime date dbesj0 dbesj1 dbesjn dbesy0 dbesy1 dbesyn \
+	besyn chdir chmod ctime dbesj0 dbesj1 dbesjn dbesy0 dbesy1 dbesyn \
 	dtime etime fdate fgetc fget flush1 fnum fputc fput fstat gerror \
 	getcwd getgid getlog getpid getuid gmtime hostnm idate ierrno irand \
 	isatty itime kill link lnblnk lstat ltime mclock perror rand rename \
 	secnds second sleep srand stat symlnk time ttynam umask unlink \
-	vxtidt vxttim alarm
+	vxttim alarm \
+	date_y2kbuggy date_y2kbug vxtidt_y2kbuggy vxtidt_y2kbug
 
 .SUFFIXES:
 
diff --git a/libf2c/f2cext.c b/libf2c/f2cext.c
index eb18ee2..56f9490 100644
--- a/libf2c/f2cext.c
+++ b/libf2c/f2cext.c
@@ -203,10 +203,23 @@ void ctime_ (char *chtime, const ftnlen Lchtime, longint *xstime) {
 }
 #endif
 
-#ifdef Ldate
+#ifdef Ldate_y2kbuggy
 int date_ (char *buf, ftnlen buf_len) {
-    extern int G77_date_0 (char *buf, ftnlen buf_len);
-    return G77_date_0 (buf, buf_len);
+  /* Fail to link, so user sees attempt to invoke non-Y2K-compliant
+     routine.  */
+    extern int G77_date_y2kbuggy_0 (char *buf, ftnlen buf_len);
+    return G77_date_y2kbuggy_0 (buf, buf_len);
+}
+#endif
+
+#ifdef Ldate_y2kbug
+int date_y2kbug__ (char *buf, ftnlen buf_len) {
+  /* If user wants to invoke the non-Y2K-compliant routine via
+     an `EXTERNAL' interface, avoiding the warning via g77's
+     `INTRINSIC' interface, force coding of "y2kbug" string in
+     user's program.  */
+    extern int G77_date_y2kbug_0 (char *buf, ftnlen buf_len);
+    return G77_date_y2kbug_0 (buf, buf_len);
 }
 #endif
 
@@ -540,10 +553,23 @@ integer unlink_ (const char *str, const ftnlen Lstr) {
 }
 #endif
 
-#ifdef Lvxtidt
+#ifdef Lvxtidt_y2kbuggy
 int vxtidate_ (integer *m, integer *d, integer *y) {
-    extern int G77_vxtidate_0 (integer *m, integer *d, integer *y);
-    return G77_vxtidate_0 (m, d, y);
+  /* Fail to link, so user sees attempt to invoke non-Y2K-compliant
+     routine.  */
+    extern int G77_vxtidate_y2kbuggy_0 (integer *m, integer *d, integer *y);
+    return G77_vxtidate_y2kbuggy_0 (m, d, y);
+}
+#endif
+
+#ifdef Lvxtidt_y2kbug
+int vxtidate_y2kbug__ (integer *m, integer *d, integer *y) {
+  /* If user wants to invoke the non-Y2K-compliant routine via
+     an `EXTERNAL' interface, avoiding the warning via g77's
+     `INTRINSIC' interface, force coding of "y2kbug" string in
+     user's program.  */
+    extern int G77_vxtidate_y2kbug_0 (integer *m, integer *d, integer *y);
+    return G77_vxtidate_y2kbug_0 (m, d, y);
 }
 #endif
 
diff --git a/libf2c/libU77/Version.c b/libf2c/libU77/Version.c
index 649d7d6..1efd510 100644
--- a/libf2c/libU77/Version.c
+++ b/libf2c/libU77/Version.c
@@ -1,6 +1,6 @@
 static char junk[] = "\n@(#) LIBU77 VERSION 19980709\n";
 
-char __G77_LIBU77_VERSION__[] = "0.5.24-19990115";
+char __G77_LIBU77_VERSION__[] = "0.5.24-19990306";
 
 #include <stdio.h>
 
diff --git a/libf2c/libU77/date_.c b/libf2c/libU77/date_.c
index 8426edc..1153765 100644
--- a/libf2c/libU77/date_.c
+++ b/libf2c/libU77/date_.c
@@ -9,7 +9,7 @@
 
 static integer c__5 = 5;
 
-/* Subroutine */ int G77_date_0 (char *buf, ftnlen buf_len)
+/* Subroutine */ int G77_date_y2kbug_0 (char *buf, ftnlen buf_len)
 {
     /* System generated locals */
     address a__1[5];
diff --git a/libf2c/libU77/vxtidate_.c b/libf2c/libU77/vxtidate_.c
index 03133ff..dc817a7 100644
--- a/libf2c/libU77/vxtidate_.c
+++ b/libf2c/libU77/vxtidate_.c
@@ -38,10 +38,10 @@ Boston, MA 02111-1307, USA.  */
 
 /* Subroutine */
 #ifdef KR_headers
-int G77_vxtidate_0 (m, d, y)
+int G77_vxtidate_y2kbug_0 (m, d, y)
      integer *y, *m, *d;
 #else
-int G77_vxtidate_0 (integer *m, integer *d, integer *y)
+int G77_vxtidate_y2kbug_0 (integer *m, integer *d, integer *y)
 #endif
 {
   struct tm *lt;