PR libgomp/26175

	PR libgomp/26477
	* configure.ac: If neither --enable-linux-futex nor
	--disable-linux-futex is passed, determine the default by checking
	for compiling and/or running against NPTL.  With --enable-linux-futex,
	check if SYS_gettid and SYS_futex are defined.
	* configure: Rebuilt.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@114809 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/libgomp/ChangeLog b/libgomp/ChangeLog
index fc12d41..dc86f86 100644 (file)
--- a/libgomp/ChangeLog
+++ b/libgomp/ChangeLog
@@ -1,3 +1,13 @@
+2006-06-20  Jakub Jelinek  <jakub@redhat.com>
+
+       PR libgomp/26175
+       PR libgomp/26477
+       * configure.ac: If neither --enable-linux-futex nor
+       --disable-linux-futex is passed, determine the default by checking
+       for compiling and/or running against NPTL.  With --enable-linux-futex,
+       check if SYS_gettid and SYS_futex are defined.
+       * configure: Rebuilt.
+
 2006-06-14  Richard Henderson  <rth@redhat.com>
 
        PR libgomp/28008

diff --git a/libgomp/configure b/libgomp/configure
index 5d906f6..058b81b 100755 (executable)
--- a/libgomp/configure
+++ b/libgomp/configure
@@ -854,8 +854,8 @@ Optional Features:
   --enable-version-specific-runtime-libs
                           Specify that runtime libraries should be installed
                           in a compiler-specific directory [default=no]
-  _g_switchUse the Linux futex system call
-                          permit yes|no [default=yes]
+  --enable-linux-futex    Use the Linux futex system call
+                          [default=default]
   --enable-multilib       build many library versions (default)
   --disable-dependency-tracking  speeds up one-time build
   --enable-dependency-tracking   do not reject slow dependency extractors
@@ -1369,14 +1369,14 @@ if test "${enable_linux_futex+set}" = set; then
   enableval="$enable_linux_futex"
 
       case "$enableval" in
-       yes|no) ;;
-       *) { { echo "$as_me:$LINENO: error: Argument to enable/disable linux-futex must be yes or no" >&5
-echo "$as_me: error: Argument to enable/disable linux-futex must be yes or no" >&2;}
+       yes|no|default) ;;
+       *) { { echo "$as_me:$LINENO: error: Unknown argument to enable/disable linux-futex" >&5
+echo "$as_me: error: Unknown argument to enable/disable linux-futex" >&2;}
    { (exit 1); exit 1; }; } ;;
-      esac
+                          esac
 
 else
-  enable_linux_futex=yes
+  enable_linux_futex=default
 fi;
 
 echo "$as_me:$LINENO: result: $enable_linux_futex" >&5
@@ -8509,6 +8509,174 @@ cat >>confdefs.h <<\_ACEOF
 _ACEOF
 
     ;;
+  *-linux*)
+    case "$enable_linux_futex" in
+      default)
+       # If headers don't have gettid/futex syscalls definition, then
+       # default to no, otherwise there will be compile time failures.
+       # Otherwise, default to yes.  If we don't detect we are
+       # compiled/linked against NPTL and not cross-compiling, check
+       # if programs are run by default against NPTL and if not, issue
+       # a warning.
+       enable_linux_futex=no
+       cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <sys/syscall.h>
+          int lk;
+int
+main ()
+{
+syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+        { ac_try='test -z "$ac_c_werror_flag"
+                        || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+        { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#ifndef _GNU_SOURCE
+            #define _GNU_SOURCE 1
+            #endif
+            #include <pthread.h>
+            pthread_t th; void *status;
+int
+main ()
+{
+pthread_tryjoin_np (th, &status);
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+        { ac_try='test -z "$ac_c_werror_flag"
+                        || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+        { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  enable_linux_futex=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+if test x$cross_compiling = xno; then
+              if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
+                 | LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then
+                { echo "$as_me:$LINENO: WARNING: The kernel might not support futex or gettid syscalls.
+If so, please configure with --disable-linux-futex" >&5
+echo "$as_me: WARNING: The kernel might not support futex or gettid syscalls.
+If so, please configure with --disable-linux-futex" >&2;}
+              fi
+            fi
+            enable_linux_futex=yes
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+       ;;
+      yes)
+       cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <sys/syscall.h>
+          int lk;
+int
+main ()
+{
+syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+  (eval $ac_link) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+        { ac_try='test -z "$ac_c_werror_flag"
+                        || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+        { ac_try='test -s conftest$ac_exeext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  :
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+{ { echo "$as_me:$LINENO: error: SYS_gettid and SYS_futex required for --enable-linux-futex" >&5
+echo "$as_me: error: SYS_gettid and SYS_futex required for --enable-linux-futex" >&2;}
+   { (exit 1); exit 1; }; }
+fi
+rm -f conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+       ;;
+    esac
+    ;;
 esac
 
 # At least for glibc, clock_gettime is in librt.  But don't pull that

diff --git a/libgomp/configure.ac b/libgomp/configure.ac
index 606a0fd..f653b70 100644 (file)
--- a/libgomp/configure.ac
+++ b/libgomp/configure.ac
@@ -16,9 +16,9 @@ LIBGOMP_ENABLE(version-specific-runtime-libs, no, ,
 AC_MSG_RESULT($enable_version_specific_runtime_libs)
 
 AC_MSG_CHECKING([for --enable-linux-futex])
-LIBGOMP_ENABLE(linux-futex, yes,
+LIBGOMP_ENABLE(linux-futex, default, ,
   [Use the Linux futex system call],
-  permit yes|no)
+  permit yes|no|default)
 AC_MSG_RESULT($enable_linux_futex)
 
 # -------
@@ -171,6 +171,48 @@ case "$host" in
     AC_DEFINE(HAVE_BROKEN_POSIX_SEMAPHORES, 1,
        Define if the POSIX Semaphores do not work on your system.)
     ;;
+  *-linux*)
+    case "$enable_linux_futex" in
+      default)
+       # If headers don't have gettid/futex syscalls definition, then
+       # default to no, otherwise there will be compile time failures.
+       # Otherwise, default to yes.  If we don't detect we are
+       # compiled/linked against NPTL and not cross-compiling, check
+       # if programs are run by default against NPTL and if not, issue
+       # a warning.
+       enable_linux_futex=no
+       AC_LINK_IFELSE(
+        [AC_LANG_PROGRAM(
+         [#include <sys/syscall.h>
+          int lk;],
+         [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],
+         [AC_LINK_IFELSE(
+          [AC_LANG_PROGRAM(
+           [#ifndef _GNU_SOURCE
+            #define _GNU_SOURCE 1
+            #endif
+            #include <pthread.h>
+            pthread_t th; void *status;],
+           [pthread_tryjoin_np (th, &status);])],[enable_linux_futex=yes],
+           [if test x$cross_compiling = xno; then
+              if getconf GNU_LIBPTHREAD_VERSION 2>/dev/null \
+                 | LC_ALL=C grep -i NPTL > /dev/null 2>/dev/null; then
+                AC_MSG_WARN([The kernel might not support futex or gettid syscalls.
+If so, please configure with --disable-linux-futex])
+              fi
+            fi
+            enable_linux_futex=yes])])
+       ;;
+      yes)
+       AC_LINK_IFELSE(
+        [AC_LANG_PROGRAM(
+         [#include <sys/syscall.h>
+          int lk;],
+         [syscall (SYS_gettid); syscall (SYS_futex, &lk, 0, 0, 0);])],[],
+         [AC_MSG_ERROR([SYS_gettid and SYS_futex required for --enable-linux-futex])])
+       ;;
+    esac
+    ;;
 esac
 
 # At least for glibc, clock_gettime is in librt.  But don't pull that