Imported Upstream version 0.4.0

[deb_pkgs/spamass-milter.git] / ac_pike_compiler_flag.m4

diff --git a/ac_pike_compiler_flag.m4 b/ac_pike_compiler_flag.m4
new file mode 100644 (file)
index 0000000..02914f3
--- /dev/null
+++ b/ac_pike_compiler_flag.m4
@@ -0,0 +1,73 @@
+dnl AC_SYS_COMPILER_FLAG, taken from the Pike 7.5 distribution at http://pike.ida.liu.se
+dnl $Id: ac_pike_compiler_flag.m4,v 1.3 2004/05/13 21:50:08 dnelson Exp $
+
+# option, cache_name, variable, do_if_failed, do_if_ok
+AC_DEFUN([AC_PIKE_COMPILER_FLAG],
+[
+  AC_MSG_CHECKING(for $1)
+  AC_CACHE_VAL(pike_cv_option_$2,
+  [
+    OLD_CPPFLAGS="[$]CPPFLAGS"
+    CPPFLAGS="[$]OLD_CPPFLAGS $1"
+    old_ac_link="[$]ac_link"
+    ac_link="[$]old_ac_link 2>conftezt.out.2"
+    AC_TRY_RUN([
+      int foo;
+      int main(int argc, char **argv)
+      {
+        /* The following code triggs gcc:s generation of aline opcodes,
+        * which some versions of as does not support.
+        */
+       if (argc > 0) argc = 0;
+       return argc;
+      }
+    ],pike_cv_option_$2=yes,
+      pike_cv_option_$2=no, [
+      AC_TRY_LINK([], [], pike_cv_option_$2=yes, pike_cv_option_$2=no)
+    ])
+    if grep -i 'unrecognized option' <conftezt.out.2 >/dev/null; then
+      pike_cv_option_$2=no
+    elif grep -i 'unknown option' <conftezt.out.2 >/dev/null; then
+      # cc/HPUX says the following regarding -q64:
+      #
+      # cc: warning 422: Unknown option "6" ignored.
+      # cc: warning 422: Unknown option "4" ignored.
+      pike_cv_option_$2=no
+    elif grep -i 'optimizer bugs' <conftezt.out.2 >/dev/null; then
+      # gcc/FreeBSD-4.6/alpha says the following regarding -O2:
+      #
+      # cc1: warning: 
+      # ***
+      # ***     The -O2 flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM
+      # ***
+      pike_cv_option_$2=no
+    elif grep -i 'not found' <conftezt.out.2 >/dev/null; then
+      # cc/AIX says the following regarding +O3:
+      #
+      # cc: 1501-228 input file +O3 not found
+      pike_cv_option_$2=no
+    elif grep -i 'ignored' <conftezt.out.2 >/dev/null; then
+      # gcc/AIX says the following regarding -fpic:
+      #
+      # cc1: warning: -fpic ignored (all code is position independent)
+      pike_cv_option_$2=no
+    else :; fi
+    rm conftezt.out.2
+    CPPFLAGS="[$]OLD_CPPFLAGS"
+    ac_link="[$]old_ac_link"
+  ])
+  
+  if test x"[$]pike_cv_option_$2" = "xyes" ; then
+    $3="[$]$3 $1"
+    case "$3" in
+      OPTIMIZE)
+        CFLAGS="[$]CFLAGS $1"
+      ;;
+    esac
+    AC_MSG_RESULT(yes)
+    $5
+  else
+    AC_MSG_RESULT(no)
+    $4
+  fi
+])