diff options
Diffstat (limited to 'sysdeps/i386/configure')
| -rw-r--r-- | sysdeps/i386/configure | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/sysdeps/i386/configure b/sysdeps/i386/configure index d81b613a81..53b6a619d3 100644 --- a/sysdeps/i386/configure +++ b/sysdeps/i386/configure @@ -32,6 +32,55 @@ $as_echo "$ac_res" >&6; } # This file is generated from configure.in 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 $LDFLAGS + -O0 -nostdlib -nostartfiles + -S conftest.c -o - | fgrep "__sync_val_compare_and_swap" + 1>&5' + { { eval echo "\"\$as_me\":${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 "$libc_compiler_builtin_inlined" >&6; } + ac_fn_c_check_header_compile "$LINENO" "cpuid.h" "ac_cv_header_cpuid_h" "/* No default includes. */ " |