From d3d14fd4a203d6233e8174def870fa8ff44e95f4 Mon Sep 17 00:00:00 2001
From: Mattias Hansson <hansson.mattias@gmail.com>
Date: Thu, 30 Sep 2021 10:41:01 +0200
Subject: [PATCH] pkg.m4.in: PKG_CHECK_MODULES provides modversion

Projects using PKG_CHECK_MODULES wants to add compilation information to
their binaries, as part of the compilation information the projects
wants to disclose dependency versions. Currently, the projects have to
resolve dependency versions themselves when using pkg-config.

With this patch PKG_CHECK_MODULES now defines a $PKG_VERSION variable
that represents `--modversion`.
---
 pkg.m4.in | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/pkg.m4.in b/pkg.m4.in
index c183d8e..5f5182d 100644
--- a/pkg.m4.in
+++ b/pkg.m4.in
@@ -146,6 +146,7 @@ AC_MSG_CHECKING([for $2])
 
 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
 _PKG_CONFIG([$1][_LIBS], [libs], [$2])
+_PKG_CONFIG([$1][_VERSION], [modversion], [$2])
 
 m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
 and $1[]_LIBS to avoid the need to call pkg-config.
@@ -186,6 +187,7 @@ To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
 else
 	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
 	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
+	$1[]_VERSION=$pkg_cv_[]$1[]_VERSION
         AC_MSG_RESULT([yes])
 	$3
 fi[]dnl