Support the 'a' length modifier in scanf format strings as a C90

extension.

This fixes gcc.dg/format/c90-scanf-3.c and ext-4.c (test for excess
errors).

llvm-svn: 146649

1 files changed, 21 insertions, 0 deletions

diff --git a/clang/test/Sema/format-strings-c90.c b/clang/test/Sema/format-strings-c90.c
new file mode 100644
index 00000000000..1b00c38c041
--- /dev/null
+++ b/clang/test/Sema/format-strings-c90.c
@@ -0,0 +1,21 @@
+/* RUN: %clang_cc1 -fsyntax-only -verify -pedantic -std=c89 %s
+ */
+
+int scanf(const char * restrict, ...);
+int printf(const char *restrict, ...);
+
+void foo(char **sp, float *fp, int *ip) {
+  /* TODO: Warn that the 'a' length modifier is an extension. */
+  scanf("%as", sp);
+
+  /* TODO: Warn that the 'a' conversion specifier is a C99 feature. */
+  scanf("%a", fp);
+  scanf("%afoobar", fp);
+  printf("%a", 1.0);
+  printf("%as", 1.0);
+  printf("%aS", 1.0);
+  printf("%a[", 1.0);
+  printf("%afoo", 1.0);
+
+  scanf("%da", ip);
+}