# 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
}