configure: don't add unnecessary libraries to PKG_LIBS_PRIVATE

Library checks can succeed if the needed functions exist in libc
and don't need any extra linker flags. Avoid adding unnecessary
flags (which break static linking against libass) in this case.

diff --git a/configure.ac b/configure.ac
index 6bd96b6526a338455c0fa052471c2096495150af..8a2c7a8716e22a024d4742e4df74243a1a55757d 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -22,10 +22,15 @@ AC_CHECK_HEADERS([stdint.h iconv.h])
 AC_CHECK_FUNCS([strdup strndup])
 
 # Checks for libraries.
+# Add them to pkg-config for static linking.
+OLDLIBS="$LIBS"
+LIBS=
 use_libiconv=false
 AC_SEARCH_LIBS([libiconv_open], [iconv], use_libiconv=true)
 AC_SEARCH_LIBS([iconv_open], [iconv], use_libiconv=true)
 AC_CHECK_LIB([m], [fabs])
+pkg_libs="$LIBS"
+LIBS="$OLDLIBS $LIBS"
 
 # Check for libraries via pkg-config
 AC_ARG_ENABLE([test], AS_HELP_STRING([--enable-test],
@@ -219,11 +224,9 @@ AM_CONDITIONAL([HAVE_LIBPNG], [test x$libpng = xtrue])
 
 AM_CONDITIONAL([ENABLE_PROFILE], [test x$enable_profile = xyes])
 
-# add libraries/packages to pkg-config for static linking
-pkg_libs="-lm"
+# add packages to pkg-config for static linking
 if test "$use_libiconv" = true; then
     AC_DEFINE(CONFIG_ICONV, 1, [use iconv])
-    pkg_libs="${pkg_libs} -liconv"
 fi
 pkg_requires="freetype2 >= 9.10.3"
 pkg_requires="fribidi >= 0.19.0, ${pkg_requires}"