Pass LDFLAGS to link tests in configure.

kraj · madler · commit 9eadab425834 · 2026-01-29T00:59:54.000-08:00
LDFLAGS may contain critical flags without which linking won't
succeed. Ensure that all configure tests involving link-time checks
use LDFLAGS along with CFLAGS so that the tests perform correctly.
Without this some tests may fail, resulting in incorrect configure
results.
diff --git a/configure b/configure
@@ -495,7 +495,7 @@ if test $shared -eq 1; then
   echo Checking for shared library support... | tee -a configure.log
   # we must test in two steps (cc then ld), required at least on SunOS 4.x
   if try $CC -c $SFLAGS $test.c &&
-     try $LDSHARED $SFLAGS -o $test$shared_ext $test.o; then
+     try $LDSHARED $SFLAGS $LDFLAGS -o $test$shared_ext $test.o; then
     echo Building shared library $SHAREDLIBV with $CC. | tee -a configure.log
   elif test -z "$old_cc" -a -z "$old_cflags"; then
     echo No shared library support. | tee -a configure.log
@@ -557,7 +557,7 @@ int main(void) {
 }
 EOF
   fi
-  if try $CC $CFLAGS -o $test $test.c; then
+  if try $CC $CFLAGS $LDFLAGS -o $test $test.c; then
     sizet=`./$test`
     echo "Checking for a pointer-size integer type..." $sizet"." | tee -a configure.log
     CFLAGS="${CFLAGS} -DNO_SIZE_T=${sizet}"
@@ -591,7 +591,7 @@ int main(void) {
   return 0;
 }
 EOF
-  if try $CC $CFLAGS -o $test $test.c; then
+  if try $CC $CFLAGS $LDFLAGS -o $test $test.c; then
     echo "Checking for fseeko... Yes." | tee -a configure.log
   else
     CFLAGS="${CFLAGS} -DNO_FSEEKO"
@@ -608,7 +608,7 @@ cat > $test.c <<EOF
 #include <errno.h>
 int main() { return strlen(strerror(errno)); }
 EOF
-if try $CC $CFLAGS -o $test $test.c; then
+if try $CC $CFLAGS $LDFLAGS -o $test $test.c; then
   echo "Checking for strerror... Yes." | tee -a configure.log
 else
   CFLAGS="${CFLAGS} -DNO_STRERROR"
@@ -714,7 +714,7 @@ int main()
   return (mytest("Hello%d\n", 1));
 }
 EOF
-  if try $CC $CFLAGS -o $test $test.c; then
+  if try $CC $CFLAGS $LDFLAGS -o $test $test.c; then
     echo "Checking for vsnprintf() in stdio.h... Yes." | tee -a configure.log
 
     echo >> configure.log
@@ -807,7 +807,7 @@ int main()
 }
 EOF
 
-  if try $CC $CFLAGS -o $test $test.c; then
+  if try $CC $CFLAGS $LDFLAGS -o $test $test.c; then
     echo "Checking for snprintf() in stdio.h... Yes." | tee -a configure.log
 
     echo >> configure.log
