mirror of git://sourceware.org/git/glibc.git
98 lines
3.8 KiB
Plaintext
98 lines
3.8 KiB
Plaintext
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
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# Local configure fragment for sysdeps/i386.
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# CET is only supported for x86-64.
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if test $enable_cet != no; then
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as_fn_error $? "\"CET is only supported on x86_64 or x32\"" "$LINENO" 5
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fi
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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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as_fn_error $? "
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*** ERROR: Support for i386 is deprecated.
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*** Please use host i786, i686, i585 or i486.
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*** For example: /src/glibc/configure --host=i686-pc-linux-gnu ...\"" "$LINENO" 5
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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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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for compiler support of inlined builtin function __sync_val_compare_and_swap" >&5
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printf %s "checking for compiler support of inlined builtin function __sync_val_compare_and_swap... " >&6; }
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libc_compiler_builtin_inlined=no
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cat > conftest.c <<EOF
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int _start (void) { int a, b, c; __sync_val_compare_and_swap (&a, b, c); return 0; }
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EOF
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if ! { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
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-O0 -nostdlib -nostartfiles
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-S conftest.c -o - | grep -F "__sync_val_compare_and_swap"
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1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }
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then
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libc_compiler_builtin_inlined=yes
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fi
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rm -f conftest*
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if test $libc_compiler_builtin_inlined = yes; then
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libc_cv_unsupported_i386=no
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else
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as_fn_error $? "
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*** Building with -march=i386/-mcpu=i386 is not supported.
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*** Please use host i786, i686, i586, or i486.
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*** For example: /source/glibc/configure CFLAGS='-O2 -march=i686' ..." "$LINENO" 5
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fi
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_compiler_builtin_inlined" >&5
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printf "%s\n" "$libc_compiler_builtin_inlined" >&6; }
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if test "$static_pie" = yes; then
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for linker static PIE support" >&5
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printf %s "checking for linker static PIE support... " >&6; }
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if test ${libc_cv_ld_static_pie+y}
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then :
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printf %s "(cached) " >&6
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else case e in #(
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e) cat > conftest.s <<\EOF
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.text
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.global _start
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_start:
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movl _start@GOT(%ebx), %eax
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EOF
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libc_cv_pie_option="-Wl,-pie"
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libc_cv_ld_static_pie=no
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if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp $libc_cv_pie_option -o conftest conftest.s 1>&5'
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{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
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test $ac_status = 0; }; }; then
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if $READELF -r conftest | grep 'There are no relocations in this file.' > /dev/null; then
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libc_cv_ld_static_pie=yes
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fi
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fi
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rm -f conftest* ;;
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esac
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fi
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ld_static_pie" >&5
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printf "%s\n" "$libc_cv_ld_static_pie" >&6; }
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if test "$libc_cv_ld_static_pie" != yes; then
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as_fn_error $? "linker support for static PIE needed" "$LINENO" 5
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fi
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fi
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if test x"$multi_arch" != xno; then
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printf "%s\n" "#define NO_HIDDEN_EXTERN_FUNC_IN_PIE 1" >>confdefs.h
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fi
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