Am Samstag, 30. August 2014, 09:18:26 schrieb Richard Shaw: > In the project I'm converting to cmake there are a lot of checks for > headers and functions I've reimplemented in cmake, but it seems a lot of > autotools based programs do a lot of excessive checking and I don't want to > implement stuff that can be safely assumed on most systems. > > Here's a snippet of the checks in question:
Just my personal view, YMMV > # Checks for typedefs, structures, and compiler characteristics. > #AC_C_CONST > #AC_C_INLINE I don't think you will find a compiler these days crappy enough to _not_ support them. > #AC_TYPE_INT16_T > #AC_TYPE_INT32_T > #AC_TYPE_INT64_T > #AC_TYPE_INT8_T > #AC_TYPE_UINT16_T > #AC_TYPE_UINT32_T > #AC_TYPE_UINT64_T > #AC_TYPE_UINT8_T This is basically "is there a usable <stdint.h>" or <cstdint>. The latter you will find in newer versions of MSVC and everything else that understands recent C++, the former in every compiler supporting at least a decent level of C99, which _excludes_ MSVC for policy reasons that even MS will probably find hard to explain. So you usually don't check for these types but for the header. > #AC_STRUCT_TM > #AC_HEADER_TIME This should be safe on every Un*x-like system and even Windows IIRC. > #AC_TYPE_SIZE_T Should be there everywhere. > #AC_C_RESTRICT > #AC_C_VOLATILE I'm not sure if you should even think of using them. Especially volatile is often something that means "you are doing something scary". Eike
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