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Diffstat (limited to 'autosetup/cc-lib.tcl')
| -rw-r--r-- | autosetup/cc-lib.tcl | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/autosetup/cc-lib.tcl b/autosetup/cc-lib.tcl new file mode 100644 index 0000000..4df5130 --- /dev/null +++ b/autosetup/cc-lib.tcl @@ -0,0 +1,161 @@ +# Copyright (c) 2011 WorkWare Systems http://www.workware.net.au/ +# All rights reserved + +# @synopsis: +# +# Provides a library of common tests on top of the 'cc' module. + +use cc + +module-options {} + +# @cc-check-lfs +# +# The equivalent of the AC_SYS_LARGEFILE macro +# +# defines 'HAVE_LFS' if LFS is available, +# and defines '_FILE_OFFSET_BITS=64' if necessary +# +# Returns 1 if 'LFS' is available or 0 otherwise +# +proc cc-check-lfs {} { + cc-check-includes sys/types.h + msg-checking "Checking if -D_FILE_OFFSET_BITS=64 is needed..." + set lfs 1 + if {[msg-quiet cc-with {-includes sys/types.h} {cc-check-sizeof off_t}] == 8} { + msg-result no + } elseif {[msg-quiet cc-with {-includes sys/types.h -cflags -D_FILE_OFFSET_BITS=64} {cc-check-sizeof off_t}] == 8} { + define _FILE_OFFSET_BITS 64 + msg-result yes + } else { + set lfs 0 + msg-result none + } + define-feature lfs $lfs + return $lfs +} + +# @cc-check-endian +# +# The equivalent of the AC_C_BIGENDIAN macro +# +# defines 'HAVE_BIG_ENDIAN' if endian is known to be big, +# or 'HAVE_LITTLE_ENDIAN' if endian is known to be little. +# +# Returns 1 if determined, or 0 if not. +# +proc cc-check-endian {} { + cc-check-includes sys/types.h sys/param.h + set rc 0 + msg-checking "Checking endian..." + cc-with {-includes {sys/types.h sys/param.h}} { + if {[cctest -code { + #if !defined(BIG_ENDIAN) || !defined(BYTE_ORDER) + #error unknown + #elif BYTE_ORDER != BIG_ENDIAN + #error little + #endif + }]} { + define-feature big-endian + msg-result "big" + set rc 1 + } elseif {[cctest -code { + #if !defined(LITTLE_ENDIAN) || !defined(BYTE_ORDER) + #error unknown + #elif BYTE_ORDER != LITTLE_ENDIAN + #error big + #endif + }]} { + define-feature little-endian + msg-result "little" + set rc 1 + } else { + msg-result "unknown" + } + } + return $rc +} + +# @cc-check-flags flag ?...? +# +# Checks whether the given C/C++ compiler flags can be used. Defines feature +# names prefixed with 'HAVE_CFLAG' and 'HAVE_CXXFLAG' respectively, and +# appends working flags to '-cflags' and 'CFLAGS' or 'CXXFLAGS'. +proc cc-check-flags {args} { + set result 1 + array set opts [cc-get-settings] + switch -exact -- $opts(-lang) { + c++ { + set lang C++ + set prefix CXXFLAG + } + c { + set lang C + set prefix CFLAG + } + default { + autosetup-error "cc-check-flags failed with unknown language: $opts(-lang)" + } + } + foreach flag $args { + msg-checking "Checking whether the $lang compiler accepts $flag..." + if {[cctest -cflags $flag]} { + msg-result yes + define-feature $prefix$flag + cc-with [list -cflags [list $flag]] + define-append ${prefix}S $flag + } else { + msg-result no + set result 0 + } + } + return $result +} + +# @cc-check-standards ver ?...? +# +# Checks whether the C/C++ compiler accepts one of the specified '-std=$ver' +# options, and appends the first working one to '-cflags' and 'CFLAGS' or +# 'CXXFLAGS'. +proc cc-check-standards {args} { + array set opts [cc-get-settings] + foreach std $args { + if {[cc-check-flags -std=$std]} { + return $std + } + } + return "" +} + +# Checks whether $keyword is usable as alignof +proc cctest_alignof {keyword} { + msg-checking "Checking for $keyword..." + if {[cctest -code [subst -nobackslashes { + printf("minimum alignment is %d == %d\n", ${keyword}(char), ${keyword}('x')); + }]]} then { + msg-result ok + define-feature $keyword + } else { + msg-result "not found" + } +} + +# @cc-check-c11 +# +# Checks for several C11/C++11 extensions and their alternatives. Currently +# checks for '_Static_assert', '_Alignof', '__alignof__', '__alignof'. +proc cc-check-c11 {} { + msg-checking "Checking for _Static_assert..." + if {[cctest -code { + _Static_assert(1, "static assertions are available"); + }]} then { + msg-result ok + define-feature _Static_assert + } else { + msg-result "not found" + } + + cctest_alignof _Alignof + cctest_alignof __alignof__ + cctest_alignof __alignof +} |