GNU C Library master sources branch master updated. glibc-2.25-298-g8fa1167

[jsm28 at sourceware dot org]

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=8fa11673d6b0feb3804eba6243e4979087e008a8

commit 8fa11673d6b0feb3804eba6243e4979087e008a8
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed May 10 00:25:59 2017 +0000

    Fix rawmemchr build with GCC 8.
    
    The default rawmemchr implementation uses memchr with size (size_t)-1,
    which produces a warning with current GCC mainline.  The warning seems
    reasonable for normal code, so this patch uses the DIAG_* macros to
    disable it.
    
    Tested (compilation of glibc only) with build-many-glibcs.py for
    arm-linux-gnueabi and powerpc64le-linux-gnu, two architectures for
    which the build was previously failing.  Note that the glibc testsuite
    will still fail to build with GCC mainline because of
    <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80669>.
    
    	* string/rawmemchr.c: Include <libc-diag.h>.
    	(RAWMEMCHR): Disable -Wstringop-overflow around call to memchr
    	with size (size_t)-1.

diff --git a/ChangeLog b/ChangeLog
index a772fce..ca56339 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2017-05-10  Joseph Myers  <joseph@codesourcery.com>
+
+	* string/rawmemchr.c: Include <libc-diag.h>.
+	(RAWMEMCHR): Disable -Wstringop-overflow around call to memchr
+	with size (size_t)-1.
+
 2017-05-09  Joseph Myers  <joseph@codesourcery.com>
 
 	* sysdeps/unix/sysv/linux/mips/mips32/accept4.c: Remove file.
diff --git a/string/rawmemchr.c b/string/rawmemchr.c
index 54e8dcd..42a3f8a 100644
--- a/string/rawmemchr.c
+++ b/string/rawmemchr.c
@@ -16,6 +16,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <string.h>
+#include <libc-diag.h>
 
 #ifndef RAWMEMCHR
 # define RAWMEMCHR __rawmemchr
@@ -25,8 +26,15 @@
 void *
 RAWMEMCHR (const void *s, int c)
 {
+  DIAG_PUSH_NEEDS_COMMENT;
+#if __GNUC_PREREQ (7, 0)
+  /* GCC 8 warns about the size passed to memchr being larger than
+     PTRDIFF_MAX; the use of SIZE_MAX is deliberate here.  */
+  DIAG_IGNORE_NEEDS_COMMENT (8, "-Wstringop-overflow=");
+#endif
   if (c != '\0')
     return memchr (s, c, (size_t)-1);
+  DIAG_POP_NEEDS_COMMENT;
   return (char *)s + strlen (s);
 }
 libc_hidden_def (__rawmemchr)

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog          |    6 ++++++
 string/rawmemchr.c |    8 ++++++++
 2 files changed, 14 insertions(+), 0 deletions(-)


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