configure: add filtering of linker flags

This allows filtering of linker flags the same was as already
supported for CFLAGS.  The filter must be initialised to 'echo'
early since it is invoked by --extra-ldflags.

Signed-off-by: Mans Rullgard <mans@mansr.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/configure b/configure
index 4907c75505..9692921f4a 100755
--- a/configure
+++ b/configure
@@ -597,11 +597,11 @@ add_asflags(){
 }
 
 add_ldflags(){
-    append LDFLAGS "$@"
+    append LDFLAGS $($ldflags_filter "$@")
 }
 
 add_extralibs(){
-    prepend extralibs "$@"
+    prepend extralibs $($ldflags_filter "$@")
 }
 
 check_cmd(){
@@ -657,6 +657,8 @@ check_ld(){
         test "${f}" = "${f#-l}" && flags="$flags $f" || libs="$libs $f"
     done
     check_cc $($cflags_filter $flags) || return
+    flags=$($ldflags_filter $flags)
+    libs=$($ldflags_filter $libs)
     check_cmd $ld $LDFLAGS $flags -o $TMPE $TMPO $libs $extralibs
 }
 
@@ -1706,6 +1708,8 @@ LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
 SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
 SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'
 
+ldflags_filter=echo
+
 AS_O='-o $@'
 CC_O='-o $@'