> Here is a preprocessor patch to make error messages show C++11 
> and other relevant C++ language instead of C99.
>
> Built and tested on x86_64-linux.

This caused

FAIL: gcc.dg/cpp/macsyntx.c (test for excess errors)
FAIL: gcc.dg/cpp/macsyntx.c (test for excess errors)
FAIL: gcc.dg/cpp/macsyntx.c  (test for warnings, line 54)
FAIL: gcc.dg/cpp/macsyntx.c  (test for warnings, line 54)
FAIL: gcc.dg/cpp/macsyntx.c  (test for warnings, line 55)
FAIL: gcc.dg/cpp/macsyntx.c  (test for warnings, line 55)
FAIL: gcc.dg/cpp/macsyntx.c  (test for warnings, line 62)
FAIL: gcc.dg/cpp/macsyntx.c  (test for warnings, line 62)
FAIL: gcc.dg/cpp/sysmac1.c (test for excess errors)
FAIL: gcc.dg/cpp/sysmac1.c (test for excess errors)
FAIL: gcc.dg/cpp/sysmac1.c  (test for warnings, line 25)
FAIL: gcc.dg/cpp/sysmac1.c  (test for warnings, line 25)

(see https://gcc.gnu.org/ml/gcc-regression/2014-07/msg00162.html).

The warnings have to be adjusted as in

--- ../_clean/gcc/testsuite/gcc.dg/cpp/macsyntx.c       2014-05-10 
23:17:13.000000000 +0200
+++ gcc/testsuite/gcc.dg/cpp/macsyntx.c 2014-07-11 15:57:33.000000000 +0200
@@ -51,15 +51,15 @@ one(ichi\
 two(ichi)                      /* { dg-error "requires 2" } */
 var0()                         /* OK.  */
 var0(ichi)                     /* OK.  */
-var1()                         /* { dg-warning "rest arguments to be used" } */
-var1(ichi)                     /* { dg-warning "rest arguments to be used" } */
+var1()                         /* { dg-warning "ISO C99 requires at least one 
argument" } */
+var1(ichi)                     /* { dg-warning "ISO C99 requires at least one 
argument" } */
 var1(ichi, ni)                 /* OK.  */
 
 /* This tests two oddities of GNU rest args - omitting a comma is OK,
    and backtracking a token on pasting an empty rest args.  */
 #define rest(x, y...) x ## y   /* { dg-warning "ISO C" } */
 rest(ichi,)                    /* OK.  */
-rest(ichi)                     /* { dg-warning "rest arguments to be used" } */
+rest(ichi)                     /* { dg-warning "ISO C99 requires at least one 
argument" } */
 #if 23 != rest(2, 3)           /* OK, no warning.  */
 #error 23 != 23 !!
 #endif
--- ../_clean/gcc/testsuite/gcc.dg/cpp/sysmac1.c        2014-05-10 
23:17:12.000000000 +0200
+++ gcc/testsuite/gcc.dg/cpp/sysmac1.c  2014-07-11 15:59:18.000000000 +0200
@@ -22,5 +22,5 @@
 (str);                         /* { dg-warning "used with arguments" } */
 (sys_str);                     /* { dg-bogus "used with arguments" } */
 
-foo (one_arg);                 /* { dg-warning "requires rest arguments" } */
+foo (one_arg);                 /* { dg-warning "ISO C99 requires at least one 
argument" } */
 sys_foo (one_arg);             /* { dg-bogus "requires rest arguments" } */

Dominique

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