re PR target/39027 (double floating point suffix of 'd' and 'D' not accepted)

gcc/
	PR c/29027
	* c-lex.c (interpret_float): Default (no suffix) is double.

libcpp/
	PR c/29027
	* include/cpplib.h (CPP_N_DEFAULT): Define.
	* expr.c (interpret_float_suffix): Recognize d or D for double,
	return new value for default.
	(cpp_classify_number): Issue pedwarn for use of d or D in suffix.

gcc/testsuite/
	PR c/29027
	* gcc.dg/fltconst-1.c: Don't error for use of d or D in suffix.
	* gcc.dg/fltconst-2.c: New test.
	* gcc.dg/fltconst-double-pedantic-1.c: New test.
	* gcc.dg/fltconst-double-pedantic-2.c: New test.

From-SVN: r145422

3 files changed, 23 insertions, 5 deletions

diff --git a/libcpp/ChangeLog b/libcpp/ChangeLog
index c7c7239..1ca914d 100644
--- a/libcpp/ChangeLog
+++ b/libcpp/ChangeLog
@@ -1,5 +1,11 @@
 2009-04-01  Janis Johnson  <janis187@us.ibm.com>
 
+	PR c/39027
+	* include/cpplib.h (CPP_N_DEFAULT): Define.
+	* expr.c (interpret_float_suffix): Recognize d or D for double,
+	return new value for default.
+	(cpp_classify_number): Issue pedwarn for use of d or D in suffix.
+
 	PR c/33466
 	* expr.c (interpret_float_suffix): Reject invalid suffix that uses
 	letters from decimal float and fixed-point suffixes.
diff --git a/libcpp/expr.c b/libcpp/expr.c
index dbbb05a..6884397 100644
--- a/libcpp/expr.c
+++ b/libcpp/expr.c
@@ -84,10 +84,10 @@ static unsigned int
 interpret_float_suffix (const uchar *s, size_t len)
 {
   size_t flags;
-  size_t f, l, w, q, i;
+  size_t f, d, l, w, q, i;
 
   flags = 0;
-  f = l = w = q = i = 0;
+  f = d = l = w = q = i = 0;
 
   /* Process decimal float suffixes, which are two letters starting
      with d or D.  Order and case are significant.  */
@@ -103,7 +103,9 @@ interpret_float_suffix (const uchar *s, size_t len)
       case 'l': return (!uppercase ? (CPP_N_DFLOAT | CPP_N_LARGE) : 0); break;
       case 'L': return (uppercase ? (CPP_N_DFLOAT | CPP_N_LARGE) : 0); break;
       default:
-	return 0;
+	/* Additional two-character suffixes beginning with D are not
+	   for decimal float constants.  */
+	break;
       }
     }
 
@@ -162,6 +164,7 @@ interpret_float_suffix (const uchar *s, size_t len)
     switch (s[len])
       {
       case 'f': case 'F': f++; break;
+      case 'd': case 'D': d++; break;
       case 'l': case 'L': l++; break;
       case 'w': case 'W': w++; break;
       case 'q': case 'Q': q++; break;
@@ -171,14 +174,15 @@ interpret_float_suffix (const uchar *s, size_t len)
 	return 0;
       }
 
-  if (f + l + w + q > 1 || i > 1)
+  if (f + d + l + w + q > 1 || i > 1)
     return 0;
 
   return ((i ? CPP_N_IMAGINARY : 0)
 	  | (f ? CPP_N_SMALL :
+	     d ? CPP_N_MEDIUM :
 	     l ? CPP_N_LARGE :
 	     w ? CPP_N_MD_W :
-	     q ? CPP_N_MD_Q : CPP_N_MEDIUM));
+	     q ? CPP_N_MD_Q : CPP_N_DEFAULT));
 }
 
 /* Subroutine of cpp_classify_number.  S points to an integer suffix
@@ -365,6 +369,13 @@ cpp_classify_number (cpp_reader *pfile, const cpp_token *token)
 		   "traditional C rejects the \"%.*s\" suffix",
 		   (int) (limit - str), str);
 
+      /* A suffix for double is a GCC extension via decimal float support.
+	 If the suffix also specifies an imaginary value we'll catch that
+	 later.  */
+      if ((result == CPP_N_MEDIUM) && CPP_PEDANTIC (pfile))
+	cpp_error (pfile, CPP_DL_PEDWARN,
+		   "suffix for double constant is a GCC extension");
+
       /* Radix must be 10 for decimal floats.  */
       if ((result & CPP_N_DFLOAT) && radix != 10)
         {
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index adc6cf1..469aaed 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -780,6 +780,7 @@ struct cpp_num
 #define CPP_N_UNSIGNED	0x1000	/* Properties.  */
 #define CPP_N_IMAGINARY	0x2000
 #define CPP_N_DFLOAT	0x4000
+#define CPP_N_DEFAULT	0x8000
 
 #define CPP_N_FRACT	0x100000 /* Fract types.  */
 #define CPP_N_ACCUM	0x200000 /* Accum types.  */