--- include/c99_math.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/c99_math.h b/include/c99_math.h index 5d4f535..bec80e1 100644 --- a/include/c99_math.h +++ b/include/c99_math.h @@ -38,6 +38,12 @@ #include "c99_compat.h" +/* This is to ensure that we get M_PI, etc. definitions */ +#if defined(_MSC_VER) && !defined(_USE_MATH_DEFINES) +#error _USE_MATH_DEFINES define required when building with MSVC +#endif + + #if defined(_MSC_VER) #if _MSC_VER < 1800 -- 1.9.1
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