https://git.ruby-lang.org/ruby.git/commit/?id=ecffc6a203

From ecffc6a203822a828d00afece9c9cd782ff60a66 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 26 Sep 2022 10:20:24 +0900
Subject: Generate the revision.h before Makefile

Except for GNU make which updates makefiles automatically, repeating
configure in the same directory causes `make` to stop whenever pulled
a new commit.  This is unexpected in CIs.
---
 configure.ac | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/configure.ac b/configure.ac
index 55288b92c0..206470ae0f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4368,6 +4368,14 @@ AC_SUBST(XCC_WRAPPER) https://github.com/ruby/ruby/blob/trunk/configure.ac#L4368
 
 AS_CASE([" $CPP "], [*" $CC "*], [CPP=`echo " $CPP " | sed "s| $CC |"' $(CC) |;s/^ *//;s/  *$//'`])
 
+AS_IF([test ! -f "$srcdir/revision.h"], [
+    AS_IF([test "x$HAVE_BASERUBY" = xyes], [
+	${BASERUBY} -C "$srcdir" tool/file2lastrev.rb -q --revision.h > "$srcdir/revision.h"
+    ], [
+	touch "$srcdir/revision.h"
+    ])
+])
+
 AS_IF([test x"$firstmf" != x], [
     AC_CONFIG_FILES($firstmf:$firsttmpl, [], [firstmf="$firstmf" firsttmpl="$firsttmpl"])
 ])
-- 
cgit v1.2.1


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