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46 lines
1.2 KiB
Plaintext
46 lines
1.2 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/x86_64/elf.
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if test "$usetls" != no; then
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# Check for support of thread-local storage handling in assembler and linker.
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AC_CACHE_CHECK(for x86-64 TLS support, libc_cv_x86_64_tls, [dnl
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cat > conftest.s <<\EOF
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.section ".tdata", "awT", @progbits
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.globl foo
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foo: .quad 1
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.section ".tbss", "awT", @nobits
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.globl bar
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bar: .skip 8
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.text
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baz: leaq bar@TLSLD(%rip), %rdi
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leaq bar@DTPOFF(%rax), %rcx
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addq foo@GOTTPOFF(%rip), %rax
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movq $bar@TPOFF, %rdx
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EOF
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dnl
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if AC_TRY_COMMAND(${CC-cc} -c $CFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
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libc_cv_x86_64_tls=yes
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else
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libc_cv_x86_64_tls=no
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fi
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rm -f conftest*])
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if test $libc_cv_x86_64_tls = yes; then
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AC_DEFINE(HAVE_TLS_SUPPORT)
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fi
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fi
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dnl It is always possible to access static and hidden symbols in an
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dnl position independent way.
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AC_DEFINE(PI_STATIC_AND_HIDDEN)
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dnl Check if -mavx works.
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AC_CACHE_CHECK(for AVX support, libc_cv_cc_avx, [dnl
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if AC_TRY_COMMAND([${CC-cc} -mavx -xc /dev/null -S -o /dev/null]); then
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libc_cv_cc_avx=yes
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else
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libc_cv_cc_avx=no
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fi])
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if test $libc_cv_cc_avx = yes; then
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AC_DEFINE(HAVE_AVX_SUPPORT)
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fi
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