[Ada PATCH] Update configure to check for a recent gnat Ada compiler.

["Roger Sayle" <roger@nextmovesoftware.com>]

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GCC fails to bootstrap when configured with --enable-languages=all on
machines that have older versions of GNAT installed as the system Ada
compiler.  In configure, it's not sufficient to check whether gnat is
available, but whether a sufficiently recent version of GNAT is
installed.  This patch tweaks config/acx.m4 so that conftest.adb also
contains a reference to System.CRTL.int64 as required by the current
version of gcc/ada/osint.adb.  This fixes the build when the system
Ada is GNAT v4.8.5 (on Redhat 7) by disabling ada, but continues to
work fine when the system Ada is GNAT v11.3.1.

Tested in x86_64-pc-linux-gnu.  Ok for mainline?


2022-07-30  Roger Sayle  <roger@nextmovesoftware.com>

ChangeLog
        * config/acx.me (AC_PROG_GNAT): Update conftest.adb to include
        features required of the host gnat compiler.
        * configure: Regenerate.

Thanks in advance,
Roger
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diff --git a/config/acx.m4 b/config/acx.m4
index b86c4f9..bd3e7f8 100644
--- a/config/acx.m4
+++ b/config/acx.m4
@@ -396,6 +396,10 @@ AC_CHECK_TOOL(GNATMAKE, gnatmake, no)
 AC_CACHE_CHECK([whether compiler driver understands Ada],
 		 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
diff --git a/configure b/configure
index 65d7078..3ddcc9f 100755
--- a/configure
+++ b/configure
@@ -5608,6 +5608,10 @@ if ${acx_cv_cc_gcc_supports_ada+:} false; then :
   $as_echo_n "(cached) " >&6
 else
   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