From: H.J. Lu <hjl.tools@gmail.com>
Date: Tue, 28 Jul 2020 10:50:10 +0000 (-0700)
Subject: PKG_CHECK_MODULES: Check if $pkg_cv_[]$1[]_LIBS works
X-Git-Tag: basepoints/gcc-15~7078
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=de9e7e9e4afb956710293ef73f6b53c41e10fcd4;p=thirdparty%2Fgcc.git

PKG_CHECK_MODULES: 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.

config/ChangeLog:

	* pkg.m4 (PKG_CHECK_MODULES): Add AC_TRY_LINK to check if
	$pkg_cv_[]$1[]_LIBS works.
---

diff --git a/config/pkg.m4 b/config/pkg.m4
index 13a889017866..45587e97c8b4 100644
--- a/config/pkg.m4
+++ b/config/pkg.m4
@@ -147,6 +147,12 @@ AC_MSG_CHECKING([for $2])
 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
 _PKG_CONFIG([$1][_LIBS], [libs], [$2])
 
+dnl Check whether $pkg_cv_[]$1[]_LIBS works.
+pkg_save_LDFLAGS="$LDFLAGS"
+LDFLAGS="$LDFLAGS $pkg_cv_[]$1[]_LIBS"
+AC_TRY_LINK([],[return 0;], [pkg_failed=no], [pkg_failed=yes])
+LDFLAGS=$pkg_save_LDFLAGS
+
 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.])