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x86: Fix THREAD_GSCOPE_RESET_FLAG build on clang 

clang does not support __seg_fs in asm constraint.

Reviewed-by: Uros Bizjak <ubizjak@gmail.com>
This commit is contained in:
Adhemerval Zanella 2025-10-31 17:00:47 -03:00
parent 427c25278d
commit e3394859ee
1 changed files with 9 additions and 1 deletions
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10
sysdeps/x86_64/nptl/tls.h
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@ -198,10 +198,18 @@ _Static_assert (offsetof (tcbhead_t, __glibc_unused2) == 0x80,
# define THREAD_GSCOPE_FLAG_UNUSED 0
# define THREAD_GSCOPE_FLAG_USED 1
# define THREAD_GSCOPE_FLAG_WAIT 2
/* clang does not support __seg_fs in asm constraint. */
# ifdef __clang__
# define FS_ASM "%%fs:"
# else
# define FS_ASM
# endif
# define THREAD_GSCOPE_RESET_FLAG() \
do \
{ int __res; \
asm volatile ("xchgl %1, %0" \
asm volatile ("xchgl " FS_ASM "%1, %0" \
: "=r" (__res) \
: "m" (((struct pthread __seg_fs *)0)->header.gscope_flag), \
"0" (THREAD_GSCOPE_FLAG_UNUSED)); \