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-rw-r--r--m4/acx_pthread.m434
1 files changed, 34 insertions, 0 deletions
diff --git a/m4/acx_pthread.m4 b/m4/acx_pthread.m4
index 2cf20de..89d42c7 100644
--- a/m4/acx_pthread.m4
+++ b/m4/acx_pthread.m4
@@ -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"