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# Copyright (c) 2011 WorkWare Systems http://www.workware.net.au/ |
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# All rights reserved |
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# @synopsis: |
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# |
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# Provides a library of common tests on top of the 'cc' module. |
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use cc |
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# @cc-check-lfs |
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# |
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# The equivalent of the 'AC_SYS_LARGEFILE' macro. |
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# |
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# defines 'HAVE_LFS' if LFS is available, |
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# and defines '_FILE_OFFSET_BITS=64' if necessary |
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# |
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# Returns 1 if 'LFS' is available or 0 otherwise |
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# |
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proc cc-check-lfs {} { |
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cc-check-includes sys/types.h |
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msg-checking "Checking if -D_FILE_OFFSET_BITS=64 is needed..." |
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set lfs 1 |
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if {[msg-quiet cc-with {-includes sys/types.h} {cc-check-sizeof off_t}] == 8} { |
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msg-result no |
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} elseif {[msg-quiet cc-with {-includes sys/types.h -cflags -D_FILE_OFFSET_BITS=64} {cc-check-sizeof off_t}] == 8} { |
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define _FILE_OFFSET_BITS 64 |
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msg-result yes |
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} else { |
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set lfs 0 |
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msg-result none |
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} |
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define-feature lfs $lfs |
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return $lfs |
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} |
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# @cc-check-endian |
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# |
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# The equivalent of the 'AC_C_BIGENDIAN' macro. |
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# |
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# defines 'HAVE_BIG_ENDIAN' if endian is known to be big, |
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# or 'HAVE_LITTLE_ENDIAN' if endian is known to be little. |
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# |
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# Returns 1 if determined, or 0 if not. |
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# |
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proc cc-check-endian {} { |
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cc-check-includes sys/types.h sys/param.h |
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set rc 0 |
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msg-checking "Checking endian..." |
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cc-with {-includes {sys/types.h sys/param.h}} { |
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if {[cctest -code { |
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#if !defined(BIG_ENDIAN) || !defined(BYTE_ORDER) |
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#error unknown |
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#elif BYTE_ORDER != BIG_ENDIAN |
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#error little |
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#endif |
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}]} { |
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define-feature big-endian |
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msg-result "big" |
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set rc 1 |
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} elseif {[cctest -code { |
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#if !defined(LITTLE_ENDIAN) || !defined(BYTE_ORDER) |
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#error unknown |
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#elif BYTE_ORDER != LITTLE_ENDIAN |
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#error big |
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#endif |
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}]} { |
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define-feature little-endian |
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msg-result "little" |
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set rc 1 |
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} else { |
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msg-result "unknown" |
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} |
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} |
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return $rc |
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} |
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# @cc-check-flags flag ?...? |
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# |
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# Checks whether the given C/C++ compiler flags can be used. Defines feature |
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# names prefixed with 'HAVE_CFLAG' and 'HAVE_CXXFLAG' respectively, and |
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# appends working flags to '-cflags' and 'AS_CFLAGS' or 'AS_CXXFLAGS'. |
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proc cc-check-flags {args} { |
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set result 1 |
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array set opts [cc-get-settings] |
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switch -exact -- $opts(-lang) { |
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c++ { |
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set lang C++ |
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set prefix CXXFLAG |
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} |
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c { |
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set lang C |
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set prefix CFLAG |
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} |
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default { |
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autosetup-error "cc-check-flags failed with unknown language: $opts(-lang)" |
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} |
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} |
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foreach flag $args { |
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msg-checking "Checking whether the $lang compiler accepts $flag..." |
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if {[cctest -cflags $flag]} { |
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msg-result yes |
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define-feature $prefix$flag |
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cc-with [list -cflags [list $flag]] |
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define-append AS_${prefix}S $flag |
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} else { |
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msg-result no |
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set result 0 |
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} |
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} |
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return $result |
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} |
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# @cc-check-standards ver ?...? |
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# |
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# Checks whether the C/C++ compiler accepts one of the specified '-std=$ver' |
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# options, and appends the first working one to '-cflags' and 'AS_CFLAGS' or |
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# 'AS_CXXFLAGS'. |
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proc cc-check-standards {args} { |
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array set opts [cc-get-settings] |
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foreach std $args { |
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if {[cc-check-flags -std=$std]} { |
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return $std |
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} |
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} |
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return "" |
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} |
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# Checks whether $keyword is usable as alignof |
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proc cctest_alignof {keyword} { |
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msg-checking "Checking for $keyword..." |
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if {[cctest -code "int x = ${keyword}(char), y = ${keyword}('x');"]} then { |
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msg-result ok |
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define-feature $keyword |
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} else { |
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msg-result "not found" |
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} |
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} |
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# @cc-check-c11 |
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# |
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# Checks for several C11/C++11 extensions and their alternatives. Currently |
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# checks for '_Static_assert', '_Alignof', '__alignof__', '__alignof'. |
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proc cc-check-c11 {} { |
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msg-checking "Checking for _Static_assert..." |
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if {[cctest -code { |
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_Static_assert(1, "static assertions are available"); |
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}]} then { |
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msg-result ok |
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define-feature _Static_assert |
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} else { |
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msg-result "not found" |
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} |
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cctest_alignof _Alignof |
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cctest_alignof __alignof__ |
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cctest_alignof __alignof |
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} |
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# @cc-check-alloca |
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# |
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# The equivalent of the 'AC_FUNC_ALLOCA' macro. |
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# |
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# Checks for the existence of 'alloca' |
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# defines 'HAVE_ALLOCA' and returns 1 if it exists. |
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proc cc-check-alloca {} { |
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cc-check-some-feature alloca { |
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cctest -includes alloca.h -code { alloca (2 * sizeof (int)); } |
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} |
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} |
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# @cc-signal-return-type |
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# |
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# The equivalent of the 'AC_TYPE_SIGNAL' macro. |
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# |
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# defines 'RETSIGTYPE' to 'int' or 'void'. |
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proc cc-signal-return-type {} { |
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msg-checking "Checking return type of signal handlers..." |
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cc-with {-includes {sys/types.h signal.h}} { |
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if {[cctest -code {return *(signal (0, 0)) (0) == 1;}]} { |
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set type int |
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} else { |
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set type void |
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} |
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define RETSIGTYPE $type |
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msg-result $type |
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} |
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} |
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