# This was retrieved from
-# http://0pointer.de/cgi-bin/viewcvs.cgi/trunk/common/acx_pthread.m4?rev=1227
+# http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?revision=1277&root=avahi
# See also (perhaps for new versions?)
-# http://0pointer.de/cgi-bin/viewcvs.cgi/trunk/common/acx_pthread.m4
+# http://svn.0pointer.de/viewvc/trunk/common/acx_pthread.m4?root=avahi
+#
+# We've rewritten the inconsistency check code (from avahi), to work
+# more broadly. In particular, it no longer assumes ld accepts -zdefs.
+# This caused a restructing of the code, but the functionality has only
+# changed a little.
dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
dnl
PTHREAD_CC=$CC
fi
- # The next part tries to detect GCC inconsistency with -shared on some
- # architectures and systems. The problem is that in certain
- # configurations, when -shared is specified, GCC "forgets" to
- # internally use various flags which are still necessary.
-
- AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies])
- check_inconsistencies=yes
- case "${host_cpu}-${host_os}" in
- *-darwin*) check_inconsistencies=no ;;
- esac
- if test x"$GCC" != xyes -o "x$check_inconsistencies" != xyes ; then
- AC_MSG_RESULT([no])
- else
- AC_MSG_RESULT([yes])
-
- # In order not to create several levels of indentation, we test
- # the value of "$ok" until we find out the cure or run out of
- # ideas.
- ok="no"
-
- #
- # Prepare the flags
- #
- save_CFLAGS="$CFLAGS"
- save_LIBS="$LIBS"
- save_CC="$CC"
- # Try with the flags determined by the earlier checks.
- #
- # -Wl,-z,defs forces link-time symbol resolution, so that the
- # linking checks with -shared actually have any value
- #
- # FIXME: -fPIC is required for -shared on many architectures,
- # so we specify it here, but the right way would probably be to
- # properly detect whether it is actually required.
- CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
- LIBS="$PTHREAD_LIBS $LIBS"
- CC="$PTHREAD_CC"
-
- AC_MSG_CHECKING([whether -pthread is sufficient with -shared])
- 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); ],
- [ok=yes])
-
- if test "x$ok" = xyes; then
- AC_MSG_RESULT([yes])
- else
- AC_MSG_RESULT([no])
- fi
-
- #
- # Linux gcc on some architectures such as mips/mipsel forgets
- # about -lpthread
- #
- if test x"$ok" = xno; then
- AC_MSG_CHECKING([whether -lpthread fixes that])
- LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
- AC_TRY_LINK([#include <pthread.h>],
- [pthread_t th; pthread_join(th, 0);
- pthread_attr_init(0); pthread_cleanup_push(0, 0);
- pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
- [ok=yes])
-
- if test "x$ok" = xyes; then
- AC_MSG_RESULT([yes])
- PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
- else
- AC_MSG_RESULT([no])
- fi
- fi
- #
- # FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
- #
- if test x"$ok" = xno; then
- AC_MSG_CHECKING([whether -lc_r fixes that])
- LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
- AC_TRY_LINK([#include <pthread.h>],
- [pthread_t th; pthread_join(th, 0);
- pthread_attr_init(0); pthread_cleanup_push(0, 0);
- pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
- [ok=yes])
-
- if test "x$ok" = xyes; then
- AC_MSG_RESULT([yes])
- PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
- else
- AC_MSG_RESULT([no])
- fi
- fi
- if test x"$ok" = xno; then
- # OK, we have run out of ideas
- AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
-
- # so it's not safe to assume that we may use pthreads
- acx_pthread_ok=no
- fi
-
- CFLAGS="$save_CFLAGS"
- LIBS="$save_LIBS"
- CC="$save_CC"
- fi
+ # The next part tries to detect GCC inconsistency with -shared on some
+ # architectures and systems. The problem is that in certain
+ # configurations, when -shared is specified, GCC "forgets" to
+ # internally use various flags which are still necessary.
+
+ #
+ # Prepare the flags
+ #
+ save_CFLAGS="$CFLAGS"
+ save_LIBS="$LIBS"
+ save_CC="$CC"
+
+ # Try with the flags determined by the earlier checks.
+ #
+ # -Wl,-z,defs forces link-time symbol resolution, so that the
+ # linking checks with -shared actually have any value
+ #
+ # FIXME: -fPIC is required for -shared on many architectures,
+ # so we specify it here, but the right way would probably be to
+ # properly detect whether it is actually required.
+ CFLAGS="-shared -fPIC -Wl,-z,defs $CFLAGS $PTHREAD_CFLAGS"
+ LIBS="$PTHREAD_LIBS $LIBS"
+ CC="$PTHREAD_CC"
+
+ # In order not to create several levels of indentation, we test
+ # the value of "$done" until we find the cure or run out of ideas.
+ done="no"
+
+ # First, make sure the CFLAGS we added are actually accepted by our
+ # compiler. If not (and OS X's ld, for instance, does not accept -z),
+ # then we can't do this test.
+ if test x"$done" = xno; then
+ AC_MSG_CHECKING([whether to check for GCC pthread/shared inconsistencies])
+ AC_TRY_LINK(,, , [done=yes])
+
+ if test "x$done" = xyes ; then
+ AC_MSG_RESULT([no])
+ else
+ AC_MSG_RESULT([yes])
+ fi
+ fi
+
+ if test x"$done" = xno; then
+ AC_MSG_CHECKING([whether -pthread is sufficient with -shared])
+ 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])
+
+ if test "x$done" = xyes; then
+ AC_MSG_RESULT([yes])
+ else
+ AC_MSG_RESULT([no])
+ fi
+ fi
+
+ #
+ # Linux gcc on some architectures such as mips/mipsel forgets
+ # about -lpthread
+ #
+ if test x"$done" = xno; then
+ AC_MSG_CHECKING([whether -lpthread fixes that])
+ LIBS="-lpthread $PTHREAD_LIBS $save_LIBS"
+ AC_TRY_LINK([#include <pthread.h>],
+ [pthread_t th; pthread_join(th, 0);
+ pthread_attr_init(0); pthread_cleanup_push(0, 0);
+ pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
+ [done=yes])
+
+ if test "x$done" = xyes; then
+ AC_MSG_RESULT([yes])
+ PTHREAD_LIBS="-lpthread $PTHREAD_LIBS"
+ else
+ AC_MSG_RESULT([no])
+ fi
+ fi
+ #
+ # FreeBSD 4.10 gcc forgets to use -lc_r instead of -lc
+ #
+ if test x"$done" = xno; then
+ AC_MSG_CHECKING([whether -lc_r fixes that])
+ LIBS="-lc_r $PTHREAD_LIBS $save_LIBS"
+ AC_TRY_LINK([#include <pthread.h>],
+ [pthread_t th; pthread_join(th, 0);
+ pthread_attr_init(0); pthread_cleanup_push(0, 0);
+ pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
+ [done=yes])
+
+ if test "x$done" = xyes; then
+ AC_MSG_RESULT([yes])
+ PTHREAD_LIBS="-lc_r $PTHREAD_LIBS"
+ else
+ AC_MSG_RESULT([no])
+ fi
+ fi
+ if test x"$done" = xno; then
+ # OK, we have run out of ideas
+ AC_MSG_WARN([Impossible to determine how to use pthreads with shared libraries])
+
+ # so it's not safe to assume that we may use pthreads
+ acx_pthread_ok=no
+ fi
+
+ CFLAGS="$save_CFLAGS"
+ LIBS="$save_LIBS"
+ CC="$save_CC"
else
PTHREAD_CC="$CC"
fi
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