From 2a2a91885a80963198cb790895bf7a07006e2bd8 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Tue, 28 Jul 2020 06:41:50 -0700
Subject: [PATCH] pkg.m4.in: Check if $pkg_cv_[]$1[]_LIBS works

It is quite normal to have headers without library on multilib OSes.
Add AC_TRY_LINK to PKG_CHECK_MODULES to check if $pkg_cv_[]$1[]_LIBS
works.
---
 pkg.m4.in | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkg.m4.in b/pkg.m4.in
index c183d8e..98ac5d3 100644
--- a/pkg.m4.in
+++ b/pkg.m4.in
@@ -147,6 +147,14 @@ AC_MSG_CHECKING([for $2])
 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
 _PKG_CONFIG([$1][_LIBS], [libs], [$2])
 
+dnl Check whether $pkg_cv_[]$1[]_LIBS works.
+if test $pkg_failed = no; then
+  pkg_save_LDFLAGS="$LDFLAGS"
+  LDFLAGS="$LDFLAGS $pkg_cv_[]$1[]_LIBS"
+  AC_TRY_LINK([],[], [], [pkg_failed=yes])
+  LDFLAGS=$pkg_save_LDFLAGS
+fi
+
 m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
 and $1[]_LIBS to avoid the need to call pkg-config.
 See the pkg-config man page for more details.])