llvm-project

6d097d24 - [clang] Suppress glibc C11 extension warning in `c-index-test` (#193335)

[clang] Suppress glibc C11 extension warning in `c-index-test` (#193335) `c-index-test.c` is still compiled with `-std=gnu89` on purpose. That acts as a useful guard rail: it helps keep the file compatible with older C dialects instead of silently picking up newer C features because Clang defaults to a newer language mode. Ubuntu 26.04 LTS updates glibc's `string.h` so `strchr`, `strrchr` and `strstr` are routed through `_Generic`-based macros. When Clang compiles `c-index-test.c` with `-std=gnu89` and `-pedantic`, that now triggers `-Wc11-extensions` warnings even though the source itself is not using C11 features. Keep the gnu89 check in place and suppress this warning only for Clang when building c-index-test. Fixes #193356