37 lines
1.7 KiB
CMake
37 lines
1.7 KiB
CMake
# AC_HEADER_STDC is gross overkill since the current PLplot code only uses
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# this for whether or not atexit can be used. But implement the full suite
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# of AC_HEADER_STDC checks to keep the cmake version in synch with autotools
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# and just in case some PLplot developer assumes the complete check for
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# standard headers is done for a future programming change.
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#
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# From info autoconf....
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# Define STDC_HEADERS if the system has ANSI C header files.
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# Specifically, this macro checks for stdlib.h', stdarg.h',
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# string.h', and float.h'; if the system has those, it probably
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# has the rest of the ANSI C header files. This macro also checks
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# whether string.h' declares memchr' (and thus presumably the
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# other mem' functions), whether stdlib.h' declare free' (and
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# thus presumably malloc' and other related functions), and whether
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# the ctype.h' macros work on characters with the high bit set, as
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# ANSI C requires.
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message(STATUS "Checking whether system has ANSI C header files")
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check_include_files("stdlib.h;stdarg.h;string.h;float.h" StandardHeadersExist)
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if(StandardHeadersExist)
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check_prototype_exists(memchr string.h memchrExists)
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if(memchrExists)
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check_prototype_exists(free stdlib.h freeExists)
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if(freeExists)
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include(TestForHighBitCharacters)
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if(CMAKE_HIGH_BIT_CHARACTERS)
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message(STATUS "ANSI C header files - found")
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set(STDC_HEADERS 1 CACHE INTERNAL "System has ANSI C header files")
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endif(CMAKE_HIGH_BIT_CHARACTERS)
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endif(freeExists)
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endif(memchrExists)
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endif(StandardHeadersExist)
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if(NOT STDC_HEADERS)
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message(STATUS "ANSI C header files - not found")
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set(STDC_HEADERS 0 CACHE INTERNAL "System has ANSI C header files")
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endif(NOT STDC_HEADERS)
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