From 0184d344fa4f215cd345bb131db9068e077c69b8 Mon Sep 17 00:00:00 2001 From: Jia Tan Date: Wed, 19 Jul 2023 23:36:00 +0800 Subject: [PATCH] liblzma: Suppress -Wunused-function warning. Clang 16.0.0 and earlier have a bug that the ifunc resolver function triggers the -Wunused-function warning. The resolver function is static and only "used" by the __attribute__((__ifunc()__)). At this time, the bug is still unresolved, but has been reported: https://github.com/llvm/llvm-project/issues/63957 This is not a problem in GCC. --- src/liblzma/check/crc64_fast.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/src/liblzma/check/crc64_fast.c b/src/liblzma/check/crc64_fast.c index e2d4ec3c..f6e872ed 100644 --- a/src/liblzma/check/crc64_fast.c +++ b/src/liblzma/check/crc64_fast.c @@ -441,6 +441,13 @@ is_clmul_supported(void) typedef uint64_t (*crc64_func_type)( const uint8_t *buf, size_t size, uint64_t crc); +// Clang 16.0.0 and older has a bug where it marks the ifunc resolver +// function as unused since it is static and never used outside of +// __attribute__((__ifunc__())). +#if defined(HAVE_FUNC_ATTRIBUTE_IFUNC) && defined(__clang__) +# pragma GCC diagnostic push +# pragma GCC diagnostic ignored "-Wunused-function" +#endif static crc64_func_type crc64_resolve(void) @@ -448,6 +455,9 @@ crc64_resolve(void) return is_clmul_supported() ? &crc64_clmul : &crc64_generic; } +#if defined(HAVE_FUNC_ATTRIBUTE_IFUNC) && defined(__clang__) +# pragma GCC diagnostic pop +#endif #ifndef HAVE_FUNC_ATTRIBUTE_IFUNC