From b95bb5267e30b26d0831b6ba01d9bd25835d1046 Mon Sep 17 00:00:00 2001
From: Alan Modra <amodra@gmail.com>
Date: Wed, 12 Oct 2022 10:06:35 +1030
Subject: Re: Merge configure.ac from gcc project

Also copy over config.acx.m4, and regenerate.
---
 config/acx.m4 | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'config')

diff --git a/config/acx.m4 b/config/acx.m4
index 87c1b5e..7efe98a 100644
--- a/config/acx.m4
+++ b/config/acx.m4
@@ -393,9 +393,13 @@ AC_DEFUN([ACX_PROG_GNAT],
 AC_REQUIRE([AC_PROG_CC])
 AC_CHECK_TOOL(GNATBIND, gnatbind, no)
 AC_CHECK_TOOL(GNATMAKE, gnatmake, no)
-AC_CACHE_CHECK([whether compiler driver understands Ada],
+AC_CACHE_CHECK([whether compiler driver understands Ada and is recent enough],
 		 acx_cv_cc_gcc_supports_ada,
 [cat >conftest.adb <<EOF
+pragma Warnings (Off);
+with System.CRTL;
+pragma Warnings (On);
+use type System.CRTL.int64;
 procedure conftest is begin null; end conftest;
 EOF
 acx_cv_cc_gcc_supports_ada=no
@@ -420,6 +424,31 @@ else
 fi
 ])
 
+# Test for D.
+AC_DEFUN([ACX_PROG_GDC],
+[AC_REQUIRE([AC_CHECK_TOOL_PREFIX])
+AC_REQUIRE([AC_PROG_CC])
+AC_CHECK_TOOL(GDC, gdc, no)
+AC_CACHE_CHECK([whether the D compiler works],
+		 acx_cv_d_compiler_works,
+[cat >conftest.d <<EOF
+module conftest; int main() { return 0; }
+EOF
+acx_cv_d_compiler_works=no
+if test "x$GDC" != xno; then
+  errors=`(${GDC} $1[]m4_ifval([$1], [ ])-c conftest.d) 2>&1 || echo failure`
+  if test x"$errors" = x && test -f conftest.$ac_objext; then
+    acx_cv_d_compiler_works=yes
+  fi
+  rm -f conftest.*
+fi])
+if test "x$GDC" != xno && test x$acx_cv_d_compiler_works != xno; then
+  have_gdc=yes
+else
+  have_gdc=no
+fi
+])
+
 dnl 'make compare' can be significantly faster, if cmp itself can
 dnl skip bytes instead of using tail.  The test being performed is
 dnl "if cmp --ignore-initial=2 t1 t2 && ! cmp --ignore-initial=1 t1 t2"
-- 
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