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Merge branch 'mh/pthreads-autoconf' into maint

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* mh/pthreads-autoconf:
  configure.ac: fix pthreads detection on Mac OS X
This commit is contained in:
Junio C Hamano 2013-01-10 14:04:26 -08:00
commit 3129891bbc
1 changed files with 11 additions and 1 deletions
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12
configure.ac
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@ -1021,7 +1021,17 @@ if test -n "$USER_NOPTHREAD"; then
# -D_REENTRANT' or some such.
elif test -z "$PTHREAD_CFLAGS"; then
threads_found=no
for opt in -mt -pthread -lpthread; do
# Attempt to compile and link some code using pthreads to determine
# required linker flags. The order is somewhat important here: We
# first try it without any extra flags, to catch systems where
# pthreads are part of the C library, then go on testing various other
# flags. We do so to avoid false positives. For example, on Mac OS X
# pthreads are part of the C library; moreover, the compiler allows us
# to add "-mt" to the CFLAGS (although it will do nothing except
# trigger a warning about an unused flag). Hence if we checked for
# "-mt" before "" we would end up picking it. But unfortunately this
# would then trigger compiler warnings on every single file we compile.
for opt in "" -mt -pthread -lpthread; do
old_CFLAGS="$CFLAGS"
CFLAGS="$opt $CFLAGS"
AC_MSG_CHECKING([for POSIX Threads with '$opt'])