From 7c6ae994fb587c19ca14aebe18dbc9aca83be609 Mon Sep 17 00:00:00 2001
From: Iain Buclaw <ibuclaw@gdcproject.org>
Date: Thu, 16 Dec 2021 23:56:16 +0100
Subject: config: Add check whether D compiler works (PR103528)

As well as checking for the existence of a GDC compiler, also validate
that it has also been built with libphobos, otherwise warn or fail with
the message that GDC is required to build d.

config/ChangeLog:

	PR d/103528
	* acx.m4 (ACX_PROG_GDC): Add check whether D compiler works.

ChangeLog:

	* configure: Regenerate.
---
 config/acx.m4 | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'config')

diff --git a/config/acx.m4 b/config/acx.m4
index 3c65d82..b86c4f9 100644
--- a/config/acx.m4
+++ b/config/acx.m4
@@ -425,7 +425,20 @@ 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
-- 
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