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build(libchdr): guard the pragma with __has_warning

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Copilot review on #797: a clang without -Wtypedef-redefinition would
warn about the unknown option in the pragma itself. Test __has_warning
in its own #if (a preprocessor without it would choke on the call even
behind &&). iOS build still 0 warnings.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
This commit is contained in:
Joseph MattielloandClaude Opus 5.5 committed 2026-10-04 09:22:58 -04:00
1 parent 3cf7c31e2c
commit 896772cf95
1 file changed
+11 -3
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deps/libchdr/unity.c
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+11 -3
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@@ -35,14 +35,22 @@
/* LZMA's 7zTypes.h and miniz.h both `typedef unsigned char Byte;`. The
* two are identical (legal C11), but clang warns under -std=c99
* (-Wtypedef-redefinition). Silenced here rather than by editing the
* vendored headers; GCC does not raise it. */
#if defined(__clang__)
* vendored headers; GCC does not raise it. `__has_warning` is tested in
* its own #if: a preprocessor without it would choke on the call even
* behind a short-circuiting `&&`. */
#if defined(__clang__) && defined(__has_warning)
# if __has_warning("-Wtypedef-redefinition")
# define VJ_LIBCHDR_SILENCE_TYPEDEF_REDEF 1
# endif
#endif
#ifdef VJ_LIBCHDR_SILENCE_TYPEDEF_REDEF
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wtypedef-redefinition"
#endif
#include "deps/miniz-3.1.1/miniz.c"
#if defined(__clang__)
#ifdef VJ_LIBCHDR_SILENCE_TYPEDEF_REDEF
#pragma clang diagnostic pop
#undef VJ_LIBCHDR_SILENCE_TYPEDEF_REDEF
#endif
#include "deps/zstd-1.5.7/zstddeclib.c"