project('has function', 'c', 'cpp') compilers = [meson.get_compiler('c'), meson.get_compiler('cpp')] foreach cc : compilers if not cc.has_function('printf', prefix : '#include') error('"printf" function not found (should always exist).') endif # Should also be able to detect it without specifying the header # We check for a different function here to make sure the result is # not taken from a cache (ie. the check above) # On MSVC fprintf is defined as an inline function in the header, so it cannot # be found without the include. if cc.get_id() != 'msvc' assert(cc.has_function('fprintf'), '"fprintf" function not found without include (on !msvc).') else assert(cc.has_function('fprintf', prefix : '#include '), '"fprintf" function not found with include (on msvc).') endif if cc.has_function('hfkerhisadf', prefix : '#include') error('Found non-existent function "hfkerhisadf".') endif # With glibc on Linux lchmod is a stub that will always return an error, # we want to detect that and declare that the function is not available. # We can't check for the C library used here of course, but if it's not # implemented in glibc it's probably not implemented in any other 'slimmer' # C library variants either, so the check should be safe either way hopefully. if host_machine.system() == 'linux' and cc.get_id() == 'gcc' assert (cc.has_function('poll', prefix : '#include '), 'couldn\'t detect "poll" when defined by a header') assert (not cc.has_function('lchmod', prefix : '''#include #include '''), '"lchmod" check should have failed') endif # For some functions one needs to define _GNU_SOURCE before including the # right headers to get them picked up. Make sure we can detect these functions # as well without any prefix if cc.has_header_symbol('sys/socket.h', 'recvmmsg', prefix : '#define _GNU_SOURCE') # We assume that if recvmmsg exists sendmmsg does too assert (cc.has_function('sendmmsg'), 'Failed to detect function "sendmmsg" (should always exist).') endif endforeach