[Mesa-dev] [PATCH] autoconf: Fix build of dri symbols test to not manually link expat.

[Eric Anholt]

AC_CHECK_LIB has this nasty behavior, like the cflags tests, of
automatically putting the tested value into the global LIBS on
success.  This caused -lexpat to end up in LIBS, but without the
--with-expat dir, so my 32-bit build on a 64 system using expat from a
custom prefix could only find the system expat and fail to link on the
one current consumer of the LIBS variable: the dri driver test link.
---
 configure.ac |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index f3f5e3e..7baa04a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1269,8 +1269,10 @@ if test "x$enable_dri" = xyes; then
             EXPAT_LIB="-L$withval/$LIB_DIR -lexpat"
             ])
         AC_CHECK_HEADER([expat.h],[],[AC_MSG_ERROR([Expat required for DRI.])])
+	save_LIBS="$LIBS"
         AC_CHECK_LIB([expat],[XML_ParserCreate],[],
             [AC_MSG_ERROR([Expat required for DRI.])])
+	LIBS="$save_LIBS"
     fi
 
     # libdrm is required for all except swrast
-- 
1.7.7.3