patch needed after gnulib changed

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Hi,

There was a change today in gnulib, that requires a small change in
packages that use gnulib-tool --with-tests with --makefile-name.
GNU m4 is one such package.

Currently, './bootstrap' fails like this:
...
bootstrap: running: autoreconf --symlink --install
tests/gnulib.mk:47: error: AM_CFLAGS must be set with '=' before using '+='
tests/Makefile.am:21:   'tests/gnulib.mk' included from here
tests/gnulib.mk:48: error: AM_CXXFLAGS must be set with '=' before using '+='
tests/Makefile.am:21:   'tests/gnulib.mk' included from here
autoreconf: error: automake failed with exit status: 1

The attached proposed patch fixes it.


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From fc620141d8d8d062ac7bcf297f6a3911e8f665c1 Mon Sep 17 00:00:00 2001
From: Bruno Haible <[email protected]>
Date: Thu, 4 Sep 2025 01:02:38 +0200
Subject: [PATCH] build: Update after gnulib changed.

* tests/Makefile.am: Initialize AM_CFLAGS and AM_CXXFLAGS.
---
 tests/Makefile.am | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 5cd64696..0b26e912 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -18,4 +18,7 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+AM_CFLAGS =
+AM_CXXFLAGS =
+
 include gnulib.mk
-- 
2.50.1


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