1 files changed, 24 insertions, 0 deletions
diff --git a/m4/ld-as-needed.m4 b/m4/ld-as-needed.m4
new file mode 100644
index 00000000..5ba6e0f9
--- /dev/null
+++ b/m4/ld-as-needed.m4
@@ -0,0 +1,24 @@
+# ld-as-needed.m4 serial 2
+
+# Test if ld supports --as-needed
+
+AC_DEFUN([PAM_LD_AS_NEEDED],
+  [
+    AC_CACHE_CHECK(whether ld supports --as-needed,
+      pam_cv_ld_as_needed, [ dnl
+    cat > conftest.c <<EOF
+int main (void) { return 0; }
+EOF
+     if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+                                 -o conftest.o conftest.c
+                                 -Wl,--as-needed 1>&AS_MESSAGE_LOG_FD])
+  then
+    pam_cv_ld_as_needed=yes
+    LDFLAGS="$LDFLAGS -Wl,--as-needed"
+  else
+    pam_cv_ld_as_needed=no
+  fi
+  rm -f conftest*])
+  AC_SUBST(pam_cv_ld_as_needed)
+  ]
+)