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https://github.com/JGRennison/OpenTTD-patches.git
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35 lines
803 B
CMake
35 lines
803 B
CMake
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include(CheckCXXSourceCompiles)
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check_cxx_source_compiles("
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int main() {
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return __builtin_popcountll(__builtin_popcountl(__builtin_popcount(__builtin_ctz(1))));
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}"
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BITMATH_BUILTINS_FOUND
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)
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if (BITMATH_BUILTINS_FOUND)
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add_compile_options(
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-DWITH_BITMATH_BUILTINS
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)
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endif (BITMATH_BUILTINS_FOUND)
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check_cxx_source_compiles("
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#include <cstdint>
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int main() {
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int64_t a = 0;
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int64_t b = 0;
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int64_t c = 0;
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bool res1 = __builtin_add_overflow(a, b, &c);
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bool res2 = __builtin_sub_overflow(a, b, &c);
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bool res3 = __builtin_mul_overflow(a, b, &c);
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return (res1 || res2 || res3) ? 1 : 0;
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}"
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OVERFLOW_BUILTINS_FOUND
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)
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if (OVERFLOW_BUILTINS_FOUND)
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add_compile_options(
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-DWITH_OVERFLOW_BUILTINS
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)
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endif (OVERFLOW_BUILTINS_FOUND)
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