Don't build thread library for targets that don't support threads.

* configure.ac (pthread.h): Use AC_CHECK_HEADERS instead of
AC_CHECK_HEADER.
(target_thread_file): New.  Set from sed'ed gcc output.
(posix_threads): New.  Set from target_thread_file.  Use instead of
ac_have_pthread_h.
(pthread_create_version): Move initialization before code using it.
* configure: Regenerate.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@104838 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 24 insertions, 10 deletions

diff --git a/libmudflap/configure.ac b/libmudflap/configure.ac
index 038bac54618..039ff4e5f5c 100644
--- a/libmudflap/configure.ac
+++ b/libmudflap/configure.ac
@@ -114,15 +114,28 @@ then
   mkdir pth
 fi
 
-pthread_create_version='""'
-AC_CHECK_HEADER(pthread.h,[
-AC_DEFINE_UNQUOTED(HAVE_PTHREAD_H, 1, [define if you have <pthread.h>])
-ac_have_pthread_h=yes
-],[
-ac_have_pthread_h=
-])
-AM_CONDITIONAL(LIBMUDFLAPTH, [test "x$ac_have_pthread_h" != "x"])
-if test "x$ac_have_pthread_h" != "x"
+AC_CHECK_HEADERS(pthread.h)
+
+AC_MSG_CHECKING([for thread model used by GCC])
+target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
+AC_MSG_RESULT([$target_thread_file])
+
+# We only support posix threads, or no threads at all.
+posix_threads=
+case ${target_thread_file} in
+  posix)
+    posix_threads=yes
+    ;;
+  single)
+    ;;
+  *)
+    echo "${target_thread_file} is an unsupported thread package" 1>&2
+    exit 1
+    ;;
+esac
+
+AM_CONDITIONAL(LIBMUDFLAPTH, [test "x$posix_threads" != "x"])
+if test "x$posix_threads" != "x"
 then
         build_libmudflapth=1
 else
@@ -162,7 +175,8 @@ esac
 AC_SUBST(toolexecdir)
 AC_SUBST(toolexeclibdir)
 
-if test "x$enable_shared" = "xyes" && test "x$ac_have_pthread_h" != "x"; then
+pthread_create_version='""'
+if test "x$enable_shared" = "xyes" && test "x$posix_threads" != "x"; then
   # NB: don't check for -lpthread here, because then it would be
   # added to LIBS.  For the thread-unaware libmudflap.la, we don't
   # want it there.