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authorBrad King <brad.king@kitware.com>2014-11-10 19:56:09 +0100
committerDaniel Stenberg <daniel@haxx.se>2014-11-13 23:42:35 +0100
commit1ae06e002da6535593e988e1148ce001bb2abc2d (patch)
treeb222884dffffb86342874e921eb31ff4c2388252 /m4/xc-lt-iface.m4
parent8bdecd36174f243fa9c9e05e6ed501f61ca2984f (diff)
CMake: Restore order-dependent header checks
Revert commit 1269df2e3b (Cmake: Don't check for all headers each time, 2014-08-15) and add a comment explaining the purpose of the original code. The check_include_file_concat macro is intended to be called multiple times on a sequence of possibly dependent headers. Later headers may depend on earlier headers to provide declarations. They cannot be safely included independently on some platforms. For example, many POSIX APIs document including sys/types.h before some other headers. Also on some OS X versions sys/socket.h must be included before net/if.h or the check for the latter will fail. Signed-off-by: Brad King <brad.king@kitware.com>
Diffstat (limited to 'm4/xc-lt-iface.m4')
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