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meson: tlsdesc: minor reformatting, add comments 

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14027>
This commit is contained in:
Alex Xu (Hello71) 2021-12-02 18:34:56 -05:00 committed by Marge Bot
parent 96cc300746
commit 19f88eb858
1 changed files with 5 additions and 2 deletions
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meson.build
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@ -516,10 +516,13 @@ if not have_mtls_dialect
warning('cannot auto-detect -mtls-dialect when cross-compiling, using compiler default')
else
# -fpic to force dynamic tls, otherwise TLS relaxation defeats check
gnu2_test = cc.run('int __thread x; int main() { return x; }', args: ['-mtls-dialect=gnu2', '-fpic'], name: '-mtls-dialect=gnu2')
gnu2_test = cc.run('int __thread x; int main() { return x; }',
args: ['-mtls-dialect=gnu2', '-fpic'],
name: '-mtls-dialect=gnu2')
if gnu2_test.returncode() == 0 and (
# check for lld 13 bug: https://gitlab.freedesktop.org/mesa/mesa/-/issues/5665
host_machine.cpu_family() != 'x86_64' or
# https://github.com/mesonbuild/meson/issues/6377
# get_linker_id misses LDFLAGS=-fuse-ld=lld: https://github.com/mesonbuild/meson/issues/6377
#cc.get_linker_id() != 'ld.lld' or
cc.links('''int __thread x; int y; int main() { __asm__(
"leaq x@TLSDESC(%rip), %rax\n"