Rename AC_ prefixes to AX_ (only in names of aa macros!).

1 files changed, 118 insertions, 0 deletions

diff --git a/m4/ax_prog_cc_char_subscripts.m4 b/m4/ax_prog_cc_char_subscripts.m4
new file mode 100644
index 0000000..eeffede
--- /dev/null
+++ b/m4/ax_prog_cc_char_subscripts.m4
@@ -0,0 +1,118 @@
+# ===========================================================================
+#   http://www.nongnu.org/autoconf-archive/ax_prog_cc_char_subscripts.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_PROG_CC_CHAR_SUBSCRIPTS(substvar [,hard])
+#
+# DESCRIPTION
+#
+#   Try to find a compiler option that enables usage of char-type to index a
+#   value-field. This one needs unsigned-chars and it must suppress warnings
+#   about usage of chars for subscripting. for gcc -funsigned-char
+#   -Wno-char-subscripts
+#
+#   Currently this macro knows about GCC. hopefully will evolve to use:
+#   Solaris C compiler, Digital Unix C compiler, C for AIX Compiler, HP-UX C
+#   compiler, and IRIX C compiler.
+#
+# LICENSE
+#
+#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
+#
+#   This program is free software; you can redistribute it and/or modify it
+#   under the terms of the GNU General Public License as published by the
+#   Free Software Foundation; either version 2 of the License, or (at your
+#   option) any later version.
+#
+#   This program is distributed in the hope that it will be useful, but
+#   WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+#   Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License along
+#   with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+#   As a special exception, the respective Autoconf Macro's copyright owner
+#   gives unlimited permission to copy, distribute and modify the configure
+#   scripts that are the output of Autoconf when processing the Macro. You
+#   need not follow the terms of the GNU General Public License when using
+#   or distributing such scripts, even though portions of the text of the
+#   Macro appear in them. The GNU General Public License (GPL) does govern
+#   all other use of the material that constitutes the Autoconf Macro.
+#
+#   This special exception to the GPL applies to versions of the Autoconf
+#   Macro released by the Autoconf Archive. When you make and distribute a
+#   modified version of the Autoconf Macro, you may extend this special
+#   exception to the GPL to apply to your modified version as well.
+
+AC_DEFUN([AX_PROG_CC_CHAR_SUBSCRIPTS], [
+  pushdef([CV],ac_cv_prog_cc_char_subscripts)dnl
+  hard=$2
+  if test -z "$hard"; then
+    msg="C to enable char subscripts"
+  else
+    msg="C to ensure char subscripts"
+  fi
+  AC_CACHE_CHECK($msg, CV, [
+  cat > conftest.c <<EOF
+int main (void)
+{
+   char v = 1;
+   int x[[2]] = { 3 , 4 };
+   return x[[v]];
+}
+EOF
+  cp conftest.c writetest.c
+  dnl GCC
+  if test "$GCC" = "yes";
+  then
+      	if test -z "$hard"; then
+      	   CV="-funsigned-char -Wno-char-subscripts"
+    	else
+      	   CV="-funsigned-char -Wno-char-subscripts"
+    	fi
+
+    	if test -n "`${CC-cc} -c $CV conftest.c 2>&1`" ; then
+           CV="suppressed: did not work"
+    	fi
+
+  dnl Solaris C compiler
+	# Solaris sunpro has no option for unsignedchar but
+	# signedchar is the default for char. Duhh.
+
+  dnl HP-UX C compiler
+
+  dnl Digital Unix C compiler
+  elif ! $CC > /dev/null 2>&1 &&
+	$CC -c -unsigned conftest.c > /dev/null 2>&1 &&
+	test -f conftest.o
+  then
+	# char :  unsigned char
+	CV="-unsigned"
+
+	rm conftest.o
+    	if test -n "`${CC-cc} -c $CV conftest.c 2>&1`" ; then
+           CV="suppressed: did not work"
+    	fi
+
+  dnl C for AIX Compiler
+
+  dnl IRIX C compiler
+	# char is unsigned by default for IRIX C.
+
+  fi
+  rm -f conftest.*
+  ])
+  if test -z "[$]$1" ; then
+    if test -n "$CV" ; then
+      case "$CV" in
+        suppressed*) $1="" ;; # known but suppressed
+        *)  $1="$CV" ;;
+      esac
+    fi
+  fi
+  AC_SUBST($1)
+  popdef([CV])dnl
+])