glibc/sysdeps/i386/configure

# This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
 # Local configure fragment for sysdeps/i386.

# We no longer support i386 since it lacks the atomic instructions
# required to implement NPTL threading.
if test "$config_machine" = i386; then
  as_fn_error $? "
*** ERROR: Support for i386 is deprecated.
*** Please use host i786, i686, i585 or i486.
*** For example: /src/glibc/configure --host=i686-pc-linux-gnu ...\"" "$LINENO" 5
fi

# The GNU C Library can't be built for i386.  There are several reasons for
# this restriction.  The primary reason is that i386 lacks the atomic
# operations required to support the current NPTL implementation.  While it is
# possible that such atomic operations could be emulated in the kernel to date
# no such work has been done to enable this.  Even with NPTL disabled you still
# have no atomic.h implementation.  Given the declining use of i386 we disable
# support for building with `-march=i386' or `-mcpu=i386.' We don't explicitly
# check for i386, instead we make sure the compiler has support for inlining
# the builtin __sync_val_compare_and_swap. If it does then we should have no
# problem building for i386.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for compiler support of inlined builtin function __sync_val_compare_and_swap" >&5
$as_echo_n "checking for compiler support of inlined builtin function __sync_val_compare_and_swap... " >&6; }
libc_compiler_builtin_inlined=no
cat > conftest.c <<EOF
int _start (void) { int a, b, c; __sync_val_compare_and_swap (&a, b, c); return 0; }
EOF
if ! { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
		     -O0 -nostdlib -nostartfiles
		     -S conftest.c -o - | fgrep "__sync_val_compare_and_swap"
		     1>&5'
  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
  (eval $ac_try) 2>&5
  ac_status=$?
  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
  test $ac_status = 0; }; }
then
  libc_compiler_builtin_inlined=yes
fi
rm -f conftest*
if test $libc_compiler_builtin_inlined = yes; then
  libc_cv_unsupported_i386=no
else
  as_fn_error $? "
*** Building with -march=i386/-mcpu=i386 is not supported.
*** Please use host i786, i686, i586, or i486.
*** For example: /source/glibc/configure CFLAGS='-O2 -march=i686' ..." "$LINENO" 5
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_compiler_builtin_inlined" >&5
$as_echo "$libc_compiler_builtin_inlined" >&6; }

if test "$static_pie" = yes; then
  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker static PIE support" >&5
$as_echo_n "checking for linker static PIE support... " >&6; }
if ${libc_cv_ld_static_pie+:} false; then :
  $as_echo_n "(cached) " >&6
else
  cat > conftest.s <<\EOF
	.text
	.global _start
_start:
	movl	_start@GOT(%ebx), %eax
EOF
  libc_cv_pie_option="-Wl,-pie"
  libc_cv_ld_static_pie=no
  if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp $libc_cv_pie_option -o conftest conftest.s 1>&5'
  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
  (eval $ac_try) 2>&5
  ac_status=$?
  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
  test $ac_status = 0; }; }; then
    if $READELF -r conftest | grep 'There are no relocations in this file.' > /dev/null; then
      libc_cv_ld_static_pie=yes
    fi
  fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ld_static_pie" >&5
$as_echo "$libc_cv_ld_static_pie" >&6; }
  if test "$libc_cv_ld_static_pie" != yes; then
    as_fn_error $? "linker support for static PIE needed" "$LINENO" 5
  fi
fi

{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for Intel MPX support" >&5
$as_echo_n "checking for Intel MPX support... " >&6; }
if ${libc_cv_asm_mpx+:} false; then :
  $as_echo_n "(cached) " >&6
else
  cat > conftest.s <<\EOF
        bndmov %bnd0,(%esp)
EOF
if { ac_try='${CC-cc} -c $ASFLAGS conftest.s 1>&5'
  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
  (eval $ac_try) 2>&5
  ac_status=$?
  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
  test $ac_status = 0; }; }; then
  libc_cv_asm_mpx=yes
else
  libc_cv_asm_mpx=no
fi
rm -f conftest*
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_asm_mpx" >&5
$as_echo "$libc_cv_asm_mpx" >&6; }
if test $libc_cv_asm_mpx = yes; then
  $as_echo "#define HAVE_MPX_SUPPORT 1" >>confdefs.h

fi

$as_echo "#define PI_STATIC_AND_HIDDEN 1" >>confdefs.h


if test x"$multi_arch" != xno; then
  $as_echo "#define NO_HIDDEN_EXTERN_FUNC_IN_PIE 1" >>confdefs.h

fi