libgomp: Add RTEMS support

libgomp/ChangeLog

	* configure.tgt (*-*-rtems*): Use local-exec TLS model.
	* configure.ac (*-*-rtems*): Assume Pthread is supported.
	(pthread.h): Check for this header file.
	* configure: Regenerate.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@221415 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 24 insertions, 18 deletions

diff --git a/libgomp/configure.ac b/libgomp/configure.ac
index 4687b01d5cc..51e646d4789 100644
--- a/libgomp/configure.ac
+++ b/libgomp/configure.ac
@@ -170,28 +170,34 @@ AC_SUBST(libtool_VERSION)
 AC_STDC_HEADERS
 AC_HEADER_TIME
 ACX_HEADER_STRING
-AC_CHECK_HEADERS(unistd.h semaphore.h sys/loadavg.h sys/time.h sys/time.h)
+AC_CHECK_HEADERS(pthread.h unistd.h semaphore.h sys/loadavg.h sys/time.h sys/time.h)
 
 GCC_HEADER_STDINT(gstdint.h)
 
-# Check to see if -pthread or -lpthread is needed.  Prefer the former.
-# In case the pthread.h system header is not found, this test will fail.
 XPCFLAGS=""
-CFLAGS="$CFLAGS -pthread"
-AC_LINK_IFELSE(
- [AC_LANG_PROGRAM(
-  [#include <pthread.h>
-   void *g(void *d) { return NULL; }],
-  [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
- [XPCFLAGS=" -Wc,-pthread"],
- [CFLAGS="$save_CFLAGS" LIBS="-lpthread $LIBS"
-  AC_LINK_IFELSE(
-   [AC_LANG_PROGRAM(
-    [#include <pthread.h>
-     void *g(void *d) { return NULL; }],
-    [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
-   [],
-   [AC_MSG_ERROR([Pthreads are required to build libgomp])])])
+case "$host" in
+  *-*-rtems*)
+    # RTEMS supports Pthreads, but the library is not available at GCC build time.
+    ;;
+  *)
+    # Check to see if -pthread or -lpthread is needed.  Prefer the former.
+    # In case the pthread.h system header is not found, this test will fail.
+    CFLAGS="$CFLAGS -pthread"
+    AC_LINK_IFELSE(
+     [AC_LANG_PROGRAM(
+      [#include <pthread.h>
+       void *g(void *d) { return NULL; }],
+      [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
+     [XPCFLAGS=" -Wc,-pthread"],
+     [CFLAGS="$save_CFLAGS" LIBS="-lpthread $LIBS"
+      AC_LINK_IFELSE(
+       [AC_LANG_PROGRAM(
+        [#include <pthread.h>
+         void *g(void *d) { return NULL; }],
+        [pthread_t t; pthread_create(&t,NULL,g,NULL);])],
+       [],
+       [AC_MSG_ERROR([Pthreads are required to build libgomp])])])
+esac
 
 m4_include([plugin/configfrag.ac])