1 files changed, 24 insertions, 0 deletions
diff --git a/m4/ld-no-undefined.m4 b/m4/ld-no-undefined.m4
new file mode 100644
index 0000000..b6db946
--- /dev/null
+++ b/m4/ld-no-undefined.m4
@@ -0,0 +1,24 @@
+# ld-no-undefined.m4 serial 1
+
+# Test if ld supports --no-undefined
+
+AC_DEFUN([PAM_LD_NO_UNDEFINED],
+  [
+    AC_CACHE_CHECK(whether ld supports --no-undefined,
+      pam_cv_ld_no_undefined, [ dnl
+    cat > conftest.c <<EOF
+int main (void) { return 0; }
+EOF
+     if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+                                 -o conftest.o conftest.c
+                                 -Wl,--no-undefined 1>&AS_MESSAGE_LOG_FD])
+  then
+    pam_cv_ld_no_undefined=yes
+    LDFLAGS="$LDFLAGS -Wl,--no-undefined"
+  else
+    pam_cv_ld_no_undefined=no
+  fi
+  rm -f conftest*])
+  AC_SUBST(pam_cv_ld_no_undefined)
+  ]
+)