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Fix corner case in acx_pthread.m4 to work with -nostdlib, patch from Kacper Kowalik.

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liujisi@google.com 2011-01-13 06:44:11 +00:00
parent 57014ffa52
commit d4a57f1557
1 changed files with 34 additions and 0 deletions
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34
m4/acx_pthread.m4
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@ -340,6 +340,40 @@ if test "x$acx_pthread_ok" = xyes; then
acx_pthread_ok=no
fi
AC_MSG_CHECKING([whether what we have so far is sufficient with -nostdlib])
CFLAGS="-nostdlib $CFLAGS"
# we need c with nostdlib
LIBS="$LIBS -lc"
AC_TRY_LINK([#include <pthread.h>],
[pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
[done=yes],[done=no])
if test "x$done" = xyes; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
fi
if test x"$done" = xno; then
AC_MSG_CHECKING([whether -lpthread saves the day])
LIBS="-lpthread $LIBS"
AC_TRY_LINK([#include <pthread.h>],
[pthread_t th; pthread_join(th, 0);
pthread_attr_init(0); pthread_cleanup_push(0, 0);
pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
[done=yes],[done=no])
if test "x$done" = xyes; then
AC_MSG_RESULT([yes])
PTHREAD_LIBS="$PTHREAD_LIBS -lpthread"
else
AC_MSG_RESULT([no])
AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries and -nostdlib])
fi
fi
CFLAGS="$save_CFLAGS"
LIBS="$save_LIBS"
CC="$save_CC"