[gentoo-dev] [PATCH] autotools.eclass: Run eautoheader with --force

[YiFei Zhu <zhuyifei@google.com>]

From: YiFei Zhu <zhuyifei1999@gmail.com>

To quote Eli [1] (I can't explain it better than this):

  autotools.eclass runs autoheader without options (and in
  particular without --force). This will only remake config.h.in
  if there are actual changes to the content, which in turn means
  that it will be out of date compared to aclocal.m4 (which we very
  much expect to have changes).

  So `make` sees that the header is out of date, and runs autoheader
  yet again, this time updating the timestamp for `make` purposes.

This causes QA warning that "maintainer mode" is detected.

autoheader and autoconf added --force option at the same time [2],
so no reason only autoconf has that option in the eclass and not
autoheader.

Like, autoconf, a check on WANT_AUTOCONF != 2.1 is added because the
feature was added in autoconf 2.52.

[1] https://bugs.gentoo.org/939468#c6
[2] https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=dbf7fc61

Closes: https://bugs.gentoo.org/939468
Closes: https://bugs.gentoo.org/939535
Signed-off-by: YiFei Zhu <zhuyifei1999@gmail.com>
---
 eclass/autotools.eclass | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/eclass/autotools.eclass b/eclass/autotools.eclass
index 0571b18ba525..641612f37193 100644
--- a/eclass/autotools.eclass
+++ b/eclass/autotools.eclass
@@ -312,7 +312,13 @@ eautoreconf() {
 	else
 		eautoconf --force
 	fi
-	[[ ${AT_NOEAUTOHEADER} != "yes" ]] && eautoheader
+	if [[ ${AT_NOEAUTOHEADER} != "yes" ]] ; then
+		if [[ ${WANT_AUTOCONF} == "2.1" ]] ; then
+			eautoheader
+		else
+			eautoheader --force
+		fi
+	fi
 	[[ ${AT_NOEAUTOMAKE} != "yes" ]] && FROM_EAUTORECONF="yes" eautomake ${AM_OPTS}
 
 	if [[ ${AT_NOELIBTOOLIZE} != "yes" ]] ; then
-- 
2.46.0.662.g92d0881bb0-goog