[PATCH] PR c/89524 - Ignore -Wno-error=

[Alex Henrie]

* opts.c: Ignore -Wno-error=<some-future-warning>.
---
 gcc/opts.c                           | 5 ++++-
 gcc/testsuite/c-c++-common/pr89524.c | 7 +++++++
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/c-c++-common/pr89524.c

diff --git a/gcc/opts.c b/gcc/opts.c
index 468abb16334..f9a490cc7c2 100644
--- a/gcc/opts.c
+++ b/gcc/opts.c
@@ -3079,7 +3079,10 @@ enable_warning_as_error (const char *arg, int value, 
unsigned int lang_mask,
   strcpy (new_option + 1, arg);
   option_index = find_opt (new_option, lang_mask);
   if (option_index == OPT_SPECIAL_unknown)
-    error_at (loc, "-Werror=%s: no option -%s", arg, new_option);
+    {
+      if (value)
+       error_at (loc, "-Werror=%s: no option -%s", arg, new_option);
+    }
   else if (!(cl_options[option_index].flags & CL_WARNING))
     error_at (loc, "-Werror=%s: -%s is not an option that controls warnings",
              arg, new_option);
diff --git a/gcc/testsuite/c-c++-common/pr89524.c 
b/gcc/testsuite/c-c++-common/pr89524.c
new file mode 100644
index 00000000000..71bf745f57d
--- /dev/null
+++ b/gcc/testsuite/c-c++-common/pr89524.c
@@ -0,0 +1,7 @@
+/* PR c/89524 */
+/* { dg-options "-Werror -Wno-error=some-future-warning" } */
+
+int main(int argc, char **argv)
+{
+  return 0;
+}
-- 
2.21.0