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x86: Define MINIMUM_X86_ISA_LEVEL in config.h [BZ #31676]

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Define MINIMUM_X86_ISA_LEVEL at configure time to avoid

/usr/bin/ld: …/build/elf/librtld.os: in function `init_cpu_features':
…/git/elf/../sysdeps/x86/cpu-features.c:1202: undefined reference to `_dl_runtime_resolve_fxsave'
/usr/bin/ld: …/build/elf/librtld.os: relocation R_X86_64_PC32 against undefined hidden symbol `_dl_runtime_resolve_fxsave' can not be used when making a shared object
/usr/bin/ld: final link failed: bad value
collect2: error: ld returned 1 exit status

when glibc is built with -march=x86-64-v3 and configured with
--with-rtld-early-cflags=-march=x86-64, which is used to allow ld.so to
print an error message on unsupported CPUs:

Fatal glibc error: CPU does not support x86-64-v3

This fixes BZ #31676.
Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>
This commit is contained in:
H.J. Lu 2024-04-23 13:59:50 -07:00
parent 095067efdf
commit 46c9997413
4 changed files with 18 additions and 1 deletions
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3
config.h.in
View File

@ -285,6 +285,9 @@
/* Define if x86 ISA level should be included in shared libraries. */
#undef INCLUDE_X86_ISA_LEVEL
/* The x86 ISA level. 1 for baseline. Undefined on non-x86. */
#undef MINIMUM_X86_ISA_LEVEL
/* Define if -msahf is enabled by default on x86. */
#undef HAVE_X86_LAHF_SAHF

7
sysdeps/x86/configure vendored
View File

@ -151,6 +151,13 @@ printf "%s\n" "$libc_cv_have_x86_isa_level" >&6; }
else
libc_cv_have_x86_isa_level=baseline
fi
if test $libc_cv_have_x86_isa_level = baseline; then
printf "%s\n" "#define MINIMUM_X86_ISA_LEVEL 1" >>confdefs.h
else
printf "%s\n" "#define MINIMUM_X86_ISA_LEVEL $libc_cv_have_x86_isa_level" >>confdefs.h
fi
config_vars="$config_vars
have-x86-isa-level = $libc_cv_have_x86_isa_level"
config_vars="$config_vars

5
sysdeps/x86/configure.ac
View File

@ -105,6 +105,11 @@ EOF
else
libc_cv_have_x86_isa_level=baseline
fi
if test $libc_cv_have_x86_isa_level = baseline; then
AC_DEFINE_UNQUOTED(MINIMUM_X86_ISA_LEVEL, 1)
else
AC_DEFINE_UNQUOTED(MINIMUM_X86_ISA_LEVEL, $libc_cv_have_x86_isa_level)
fi
LIBC_CONFIG_VAR([have-x86-isa-level], [$libc_cv_have_x86_isa_level])
LIBC_CONFIG_VAR([x86-isa-level-3-or-above], [3 4])
LIBC_CONFIG_VAR([enable-x86-isa-level], [$libc_cv_include_x86_isa_level])

4
sysdeps/x86/isa-level.h
View File

@ -61,8 +61,10 @@
# define __X86_ISA_V4 0
#endif
#define MINIMUM_X86_ISA_LEVEL \
#ifndef MINIMUM_X86_ISA_LEVEL
# define MINIMUM_X86_ISA_LEVEL \
(__X86_ISA_V1 + __X86_ISA_V2 + __X86_ISA_V3 + __X86_ISA_V4)
#endif
/* Depending on the minimum ISA level, a feature check result can be a
compile-time constant.. */