[SCM] GNU Autoconf source repository branch, master, updated. v2.68-12-g18779ad

[Paul Eggert]

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- Log -----------------------------------------------------------------
commit 18779ad8f941738075be2c70d6c16acd932fd73b
Author: Paul Eggert <address@hidden>
Date:   Mon Dec 27 23:31:43 2010 -0800

    autoconf: Use -D_STDC_C99=, not -xc99=all, with Solaris cc
    
    * lib/autoconf/c.m4 (_AC_PROG_CC_C99): Use -D_STDC_C99= rather than
    -xc99=all to convince Solaris Studio cc to compile c99 programs.

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

Summary of changes:
 ChangeLog         |    6 ++++++
 lib/autoconf/c.m4 |   15 ++++++++++++---
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index c1ec95d..8c9b89f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2010-12-27  Paul Eggert  <address@hidden>
+
+       autoconf: Use -D_STDC_C99=, not -xc99=all, with Solaris cc
+       * lib/autoconf/c.m4 (_AC_PROG_CC_C99): Use -D_STDC_C99= rather than
+       -xc99=all to convince Solaris Studio cc to compile c99 programs.
+
 2010-11-26  Paul Eggert  <address@hidden>
 
        autotest: fix file descriptor leak
diff --git a/lib/autoconf/c.m4 b/lib/autoconf/c.m4
index a873ccd..5479056 100644
--- a/lib/autoconf/c.m4
+++ b/lib/autoconf/c.m4
@@ -1340,11 +1340,20 @@ dnl AIX         -qlanglvl=extc99 (unused restrictive 
mode: -qlanglvl=stdc99)
 dnl HP cc      -AC99
 dnl Intel ICC  -std=c99, -c99 (deprecated)
 dnl IRIX       -c99
-dnl Solaris    -xc99=all (Forte Developer 7 C mishandles -xc99 on Solaris 9,
-dnl            as it incorrectly assumes C99 semantics for library functions)
+dnl Solaris    -D_STDC_C99=
+dnl            cc's -xc99 option uses linker magic to define the external
+dnl            symbol __xpg4 as if by "int __xpg4 = 1;", which enables C99
+dnl            behavior for C library functions.  This is not wanted here,
+dnl            because it means that a single module compiled with -xc99
+dnl            alters C runtime behavior for the entire program, not for
+dnl            just the module.  Instead, define the (private) symbol
+dnl            _STDC_C99, which suppresses a bogus failure in <stdbool.h>.
+dnl            The resulting compiler passes the test case here, and that's
+dnl            good enough.  For more, please see the thread starting at:
+dnl            http://lists.gnu.org/archive/html/autoconf/2010-12/msg00059.html
 dnl Tru64      -c99
 dnl with extended modes being tried first.
-[[-std=gnu99 -std=c99 -c99 -AC99 -xc99=all -qlanglvl=extc99]], [$1], [$2])[]dnl
+[[-std=gnu99 -std=c99 -c99 -AC99 -D_STDC_C99= -qlanglvl=extc99]], [$1], 
[$2])[]dnl
 ])# _AC_PROG_CC_C99
 
 


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