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| author | Iain Sandoe <iains@gcc.gnu.org> | 2010-06-09 09:27:04 +0000 |
|---|---|---|
| committer | Iain Sandoe <iains@gcc.gnu.org> | 2010-06-09 09:27:04 +0000 |
| commit | dbd34b899f1ec8facc25649349cda3ffe482b3bf (patch) | |
| tree | 307696aa3f195e924bc7c2146bbcf51ca3871cf7 /config | |
| parent | fa9d7d3b70bae40150022c469b6b50c001474e11 (diff) | |
| download | gcc-dbd34b899f1ec8facc25649349cda3ffe482b3bf.zip gcc-dbd34b899f1ec8facc25649349cda3ffe482b3bf.tar.gz gcc-dbd34b899f1ec8facc25649349cda3ffe482b3bf.tar.bz2 | |
re PR bootstrap/43170 (gcc 4.5 20100218 bootstrap compare fails on os x 10.6)
config:
PR bootstrap/43170
* tls.m4 (GCC_CHECK_TLS): Add volatile qualifier to the test
references. Move the main () test reference ahead of
pthread_create(). Add a comment to explain the requirements
of the test.
libgomp:
PR bootstrap/43170
* configure: Regenerate.
libjava:
PR bootstrap/43170
* configure: Regenerate.
libmudflap:
PR bootstrap/43170
* configure: Regenerate.
libstdc++-v3:
PR bootstrap/43170
* configure: Regenerate.
From-SVN: r160457
Diffstat (limited to 'config')
| -rw-r--r-- | config/ChangeLog | 8 | ||||
| -rw-r--r-- | config/tls.m4 | 11 |
2 files changed, 16 insertions, 3 deletions
diff --git a/config/ChangeLog b/config/ChangeLog index a211292..27f49c2 100644 --- a/config/ChangeLog +++ b/config/ChangeLog @@ -1,3 +1,11 @@ +2010-06-09 Iain Sandoe <iains@gcc.gnu.org> + + PR bootstrap/43170 + * tls.m4 (GCC_CHECK_TLS): Add volatile qualifier to the test + references. Move the main () test reference ahead of + pthread_create(). Add a comment to explain the requirements + of the test. + 2010-06-03 Joern Rennecke <joern.rennecke@embecosm.com> Ralf Wildenhues <Ralf.Wildenhues@gmx.de> diff --git a/config/tls.m4 b/config/tls.m4 index ef7e6d0..4e170c8 100644 --- a/config/tls.m4 +++ b/config/tls.m4 @@ -38,11 +38,16 @@ AC_DEFUN([GCC_CHECK_TLS], [ CFLAGS="$chktls_save_CFLAGS" if test "X$thread_CFLAGS" != Xfailed; then CFLAGS="$thread_CFLAGS $chktls_save_CFLAGS" + dnl Test for an old glibc bug that violated the __thread property. + dnl Use volatile to ensure the compiler won't optimize away pointer + dnl accesses it might otherwise assume to be redundant, or reorder + dnl them and reuse storage, which might lead to them pointing to + dnl the same location. AC_RUN_IFELSE( [AC_LANG_PROGRAM( [#include <pthread.h> __thread int a; - static int *a_in_other_thread; + static int *volatile a_in_other_thread; static void * thread_func (void *arg) { @@ -51,11 +56,11 @@ AC_DEFUN([GCC_CHECK_TLS], [ }], [pthread_t thread; void *thread_retval; - int *a_in_main_thread; + int *volatile a_in_main_thread; + a_in_main_thread = &a; if (pthread_create (&thread, (pthread_attr_t *)0, thread_func, (void *)0)) return 0; - a_in_main_thread = &a; if (pthread_join (thread, &thread_retval)) return 0; return (a_in_other_thread == a_in_main_thread);])], |