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context/boost-context-features.jam
Ivan A. Melnikov 63996e427b Fix ABI detection for empty 'os.platform'
`in` operator in bjam always returns true if its first
argument has no elements[1]. This means that if `os.platform`
is empty (not detected), the construction introduced
in commit 9084161b87 sets
ABI to `aapcs` on all platforms where `os.platform` is
empty, including, e.g. loongarch64, and breaks build there.

This commit refactors the condition to use '=' operator,
to make sure that when `os.platform` is empty we get
the default ABI value, and thus fixes build on loongarch64.

See also 819c2d6423 for
similar fix that was somehow lost in refactorings. This
time a comment is added near the condition in hope
that future edits will not reintroduce the issue.

[1] https://www.boost.org/doc/libs/1_83_0/tools/build/doc/html/index.html#jam.language.flow_of_control

Fixes: 9084161b87
2025-01-23 15:39:21 +04:00

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# Copyright René Ferdinand Rivera Morell 2023-2024
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
import feature ;
import os ;
feature.feature segmented-stacks : on : optional propagated composite ;
feature.compose <segmented-stacks>on : <define>BOOST_USE_SEGMENTED_STACKS ;
feature.feature htm : tsx : optional propagated composite ;
feature.compose <htm>tsx : <define>BOOST_USE_TSX ;
feature.feature valgrind : on : optional propagated composite ;
feature.compose <valgrind>on : <define>BOOST_USE_VALGRIND ;
local rule default_binary_format ( )
{
local tmp = elf ;
if [ os.name ] = "NT" { tmp = pe ; }
else if [ os.name ] = "CYGWIN" { tmp = pe ; }
else if [ os.name ] = "AIX" { tmp = xcoff ; }
else if [ os.name ] = "MACOSX" { tmp = mach-o ; }
return $(tmp) ;
}
feature.feature binary-format
: elf
mach-o
pe
xcoff
: propagated
;
feature.set-default binary-format : [ default_binary_format ] ;
local rule default_abi ( )
{
local tmp = sysv ;
# Avoid using "in" operator here: it returns true if its left
# part is empty, which happens e.g. with os.platform on
# some uncommon architectures.
if [ os.name ] = "NT" { tmp = ms ; }
else if [ os.name ] = "CYGWIN" { tmp = ms ; }
else if [ os.platform ] = "ARM" { tmp = aapcs ; }
else if [ os.platform ] = "ARM64" { tmp = aapcs ; }
else if [ os.platform ] = "MIPS32" { tmp = o32 ; }
else if [ os.platform ] = "MIPS64" { tmp = n64 ; }
return $(tmp) ;
}
feature.feature abi
: aapcs
eabi
ms
n32
n64
o32
o64
sysv
x32
: propagated
;
feature.set-default abi : [ default_abi ] ;
feature.feature context-impl
: fcontext
ucontext
winfib
: propagated
composite
;
feature.set-default context-impl : fcontext ;
feature.compose <context-impl>ucontext : <define>BOOST_USE_UCONTEXT ;
feature.compose <context-impl>winfib : <define>BOOST_USE_WINFIB ;