From: Bruno Haible <bruno@clisp.org>
Date: Thu, 27 Jul 2006 12:18:17 +0000 (+0000)
Subject: Determine how to use OpenMP.
X-Git-Tag: 0.16.x-branchpoint~312
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=09a681943003b1297b8ce2e84f8ad94c25fcf27e;p=thirdparty%2Fgettext.git

Determine how to use OpenMP.
---

diff --git a/gettext-tools/m4/openmp.m4 b/gettext-tools/m4/openmp.m4
new file mode 100644
index 000000000..794e44c0c
--- /dev/null
+++ b/gettext-tools/m4/openmp.m4
@@ -0,0 +1,108 @@
+# openmp.m4 serial 1 (gettext-0.15.1)
+dnl Copyright (C) 2006 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl Determine the compiler flags needed to support OpenMP.
+dnl Define OPENMP_CFLAGS.
+
+dnl From Bruno Haible.
+
+AC_DEFUN([gt_OPENMP],
+[
+  AC_MSG_CHECKING([whether to use OpenMP])
+  AC_ARG_ENABLE(openmp,
+    [  --disable-openmp        do not use OpenMP],
+    [OPENMP_CHOICE="$enableval"],
+    [OPENMP_CHOICE=yes])
+  AC_MSG_RESULT([$OPENMP_CHOICE])
+  OPENMP_CFLAGS=
+  if test "$OPENMP_CHOICE" = yes; then
+    AC_MSG_CHECKING([for $CC option to support OpenMP])
+    AC_CACHE_VAL([gt_cv_prog_cc_openmp], [
+      gt_cv_prog_cc_openmp=no
+      AC_COMPILE_IFELSE([
+#ifndef _OPENMP
+ Unlucky
+#endif
+        ], [gt_cv_prog_cc_openmp=none])
+      if test "$gt_cv_prog_cc_openmp" = no; then
+        dnl Try these flags:
+        dnl   GCC >= 4.2           -fopenmp
+        dnl   SunPRO C             -xopenmp
+        dnl   Intel C              -openmp
+        dnl   SGI C, PGI C         -mp
+        dnl   Tru64 Compaq C       -omp
+        dnl   AIX IBM C            -qsmp=omp
+        if test "$GCC" = yes; then
+          gt_save_CFLAGS="$CFLAGS"
+          CFLAGS="$CFLAGS -fopenmp"
+          AC_COMPILE_IFELSE([
+#ifndef _OPENMP
+ Unlucky
+#endif
+            ], [gt_cv_prog_cc_openmp="-fopenmp"])
+          CFLAGS="$gt_save_CFLAGS"
+        else
+          AC_EGREP_CPP([Brand], [
+#if defined __SUNPRO_C || defined __SUNPRO_CC
+ Brand
+#endif
+            ], result=yes, result=no)
+          if test $result = yes; then
+            gt_save_CFLAGS="$CFLAGS"
+            CFLAGS="$CFLAGS -xopenmp"
+            AC_COMPILE_IFELSE([
+#ifndef _OPENMP
+ Unlucky
+#endif
+              ], [gt_cv_prog_cc_openmp="-xopenmp"])
+            CFLAGS="$gt_save_CFLAGS"
+          else
+            AC_EGREP_CPP([Brand], [
+#if defined __INTEL_COMPILER
+ Brand
+#endif
+              ], result=yes, result=no)
+            if test $result = yes; then
+              gt_save_CFLAGS="$CFLAGS"
+              CFLAGS="$CFLAGS -openmp"
+              AC_COMPILE_IFELSE([
+#ifndef _OPENMP
+ Unlucky
+#endif
+                ], [gt_cv_prog_cc_openmp="-openmp"])
+              CFLAGS="$gt_save_CFLAGS"
+            else
+              for flag in -mp -omp -qsmp=omp; do
+                gt_save_CFLAGS="$CFLAGS"
+                CFLAGS="$CFLAGS $flag"
+                AC_COMPILE_IFELSE([
+#ifndef _OPENMP
+ Unlucky
+#endif
+                  ], [gt_cv_prog_cc_openmp="$flag"; break])
+              done
+            fi
+          fi
+        fi
+      fi
+      ])
+    case $gt_cv_prog_cc_openmp in
+      none)
+        AC_MSG_RESULT([none needed]) ;;
+      no)
+        AC_MSG_RESULT([unsupported]) ;;
+      *)
+        AC_MSG_RESULT([$gt_cv_prog_cc_openmp]) ;;
+    esac
+    case $gt_cv_prog_cc_openmp in
+      none | no)
+        OPENMP_CFLAGS= ;;
+      *)
+        OPENMP_CFLAGS=$gt_cv_prog_cc_openmp ;;
+    esac
+  fi
+  AC_SUBST([OPENMP_CFLAGS])
+])