[CMake] Autotools->cmake: Are these checks really needed anymore?

[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:

# Checks for typedefs, structures, and compiler characteristics.
#AC_C_CONST
#AC_C_INLINE
#AC_TYPE_INT16_T
#AC_TYPE_INT32_T
#AC_TYPE_INT64_T
#AC_TYPE_INT8_T
#AC_C_RESTRICT
#AC_TYPE_SIZE_T
#AC_HEADER_TIME
#AC_STRUCT_TM
#AC_TYPE_UINT16_T
#AC_TYPE_UINT32_T
#AC_TYPE_UINT64_T
#AC_TYPE_UINT8_T
#AC_C_VOLATILE

Are they safe to skip?

Thanks,
Richard
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