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py/misc.h: prevent clang warning #10656

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py/misc.h: prevent clang warning #10656

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py/misc.h: prevent clang warning
dhalbert Oct 6, 2025
2e1c616
py/misc.h: test for __cplusplus and __clang__ more carefully
dhalbert Oct 7, 2025
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12 changes: 11 additions & 1 deletion py/misc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -54,7 +54,14 @@ typedef unsigned int uint;
#define MP_STRINGIFY(x) MP_STRINGIFY_HELPER(x)

// Static assertion macro
#if defined(__cplusplus)
#define MP_STATIC_ASSERT(cond) static_assert((cond), #cond)
#elif __GNUC__ >= 5 || __STDC_VERSION__ >= 201112L
#define MP_STATIC_ASSERT(cond) _Static_assert((cond), #cond)
#else
#define MP_STATIC_ASSERT(cond) ((void)sizeof(char[1 - 2 * !(cond)]))
#endif

// In C++ things like comparing extern const pointers are not constant-expressions so cannot be used
// in MP_STATIC_ASSERT. Note that not all possible compiler versions will reject this. Some gcc versions
// do, others only with -Werror=vla, msvc always does.
Expand All @@ -63,7 +70,10 @@ typedef unsigned int uint;
#if defined(_MSC_VER) || defined(__cplusplus)
#define MP_STATIC_ASSERT_NONCONSTEXPR(cond) ((void)1)
#else
#define MP_STATIC_ASSERT_NONCONSTEXPR(cond) MP_STATIC_ASSERT(cond)
#if defined(__clang__)
#pragma GCC diagnostic ignored "-Wgnu-folding-constant"
#endif
#define MP_STATIC_ASSERT_NONCONSTEXPR(cond) ((void)sizeof(char[1 - 2 * !(cond)]))
#endif

// Round-up integer division
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