configure: Ignore typedef-redefinition warnings with Clang

redefinition is legal in C11 and before that via gcc extension

Fixes: https://github.com/ostreedev/ostree/issues/3590

diff --git a/configure.ac b/configure.ac
index 934beebd975f1100699b76f572f46692d809a0a4..eacbabbd068978e8428d0e172b26a46cdeea71d9 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -53,6 +53,12 @@ CC_CHECK_FLAGS_APPEND([WARN_CFLAGS], [CFLAGS], [\
   -Wstrict-aliasing=2 \
   -Werror=unused-result \
 ])])
+
+AS_CASE([$CC], [*clang*], [
+  CC_CHECK_FLAGS_APPEND([WARN_CFLAGS], [CFLAGS],
+                        [-Wno-typedef-redefinition])
+])
+
 AC_SUBST(WARN_CFLAGS)
 
 AC_ARG_ENABLE(sanitizers,