0f122b8d12
We no longer support configuring for i386, nor do we elide such a configuration to i686. Configuring with i386-* is a failure, and we provide an example of how to fix that. --- 2013-04-17 Carlos O'Donell <carlos@redhat.com> * configure.in: Remove i386 configure warning. Remove i386 case. * configure: Regenerate. * sysdeps/i386/configure.in: Raise error if config_machine is i386. Add example to error message. * sysdeps/i386/configure: Regenerate.
94 lines
3.5 KiB
Plaintext
94 lines
3.5 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/i386.
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# We no longer support i386 since it lacks the atomic instructions
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# required to implement NPTL threading.
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if test "$config_machine" = i386; then
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AC_MSG_ERROR([
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*** ERROR: Support for i386 is deprecated.
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*** Please use host i786, i686, i585 or i486.
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*** For example: /src/glibc/configure --host=i686-pc-linux-gnu ..."])
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fi
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# The GNU C Library can't be built for i386. There are several reasons for
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# this restriction. The primary reason is that i386 lacks the atomic
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# operations required to support the current NPTL implementation. While it is
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# possible that such atomic operations could be emulated in the kernel to date
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# no such work has been done to enable this. Even with NPTL disabled you still
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# have no atomic.h implementation. Given the declining use of i386 we disable
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# support for building with `-march=i386' or `-mcpu=i386.' We don't explicitly
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# check for i386, instead we make sure the compiler has support for inlining
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# the builtin __sync_val_compare_and_swap. If it does then we should have no
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# problem building for i386.
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LIBC_COMPILER_BUILTIN_INLINED(
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[__sync_val_compare_and_swap],
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[int a, b, c; __sync_val_compare_and_swap (&a, b, c);],
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[-O0],
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[libc_cv_unsupported_i386=no],
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[AC_MSG_ERROR([
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*** Building with -march=i386/-mcpu=i386 is not supported.
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*** Please use host i786, i686, i586, or i486.
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*** For example: /source/glibc/configure CFLAGS='-O2 -march=i686' ...])])
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AC_CHECK_HEADER([cpuid.h], ,
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[AC_MSG_ERROR([gcc must provide the <cpuid.h> header])],
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[/* No default includes. */])
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dnl Check if -msse4 works.
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AC_CACHE_CHECK(for SSE4 support, libc_cv_cc_sse4, [dnl
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LIBC_TRY_CC_OPTION([-msse4], [libc_cv_cc_sse4=yes], [libc_cv_cc_sse4=no])
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])
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if test $libc_cv_cc_sse4 = yes; then
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AC_DEFINE(HAVE_SSE4_SUPPORT)
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fi
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LIBC_CONFIG_VAR([config-cflags-sse4], [$libc_cv_cc_sse4])
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dnl Check if -Wa,-mtune=i686 works.
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AC_CACHE_CHECK(for assembler -mtune=i686 support, libc_cv_as_i686, [dnl
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LIBC_TRY_CC_OPTION([-Wa,-mtune=i686],
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[libc_cv_as_i686=yes],
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[libc_cv_as_i686=no])
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])
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LIBC_CONFIG_VAR([config-asflags-i686], [$libc_cv_as_i686])
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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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LIBC_TRY_CC_OPTION([-mavx], [libc_cv_cc_avx=yes], [libc_cv_cc_avx=no])
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])
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if test $libc_cv_cc_avx = yes; then
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AC_DEFINE(HAVE_AVX_SUPPORT)
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fi
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LIBC_CONFIG_VAR([config-cflags-avx], [$libc_cv_cc_avx])
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dnl Check if -msse2avx works.
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AC_CACHE_CHECK(for AVX encoding of SSE instructions, libc_cv_cc_sse2avx, [dnl
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LIBC_TRY_CC_OPTION([-msse2avx],
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[libc_cv_cc_sse2avx=yes],
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[libc_cv_cc_sse2avx=no])
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])
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if test $libc_cv_cc_sse2avx = yes; then
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AC_DEFINE(HAVE_SSE2AVX_SUPPORT)
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fi
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LIBC_CONFIG_VAR([config-cflags-sse2avx], [$libc_cv_cc_sse2avx])
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dnl Check if -mfma4 works.
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AC_CACHE_CHECK(for FMA4 support, libc_cv_cc_fma4, [dnl
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LIBC_TRY_CC_OPTION([-mfma4], [libc_cv_cc_fma4=yes], [libc_cv_cc_fma4=no])
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])
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if test $libc_cv_cc_fma4 = yes; then
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AC_DEFINE(HAVE_FMA4_SUPPORT)
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fi
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LIBC_CONFIG_VAR([have-mfma4], [$libc_cv_cc_fma4])
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dnl Check if -mno-vzeroupper works.
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AC_CACHE_CHECK(for -mno-vzeroupper support, libc_cv_cc_novzeroupper, [dnl
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LIBC_TRY_CC_OPTION([-mno-vzeroupper],
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[libc_cv_cc_novzeroupper=yes],
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[libc_cv_cc_novzeroupper=no])
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])
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LIBC_CONFIG_VAR([config-cflags-novzeroupper], [$libc_cv_cc_novzeroupper])
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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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