+2013-04-06 Carlos O'Donell <carlos@redhat.com>
+
+ [BZ #10060, #10062]
+ * aclocal.m4 (LIBC_COMPILER_BUILTIN_INLINED): New macro.
+ * sysdeps/i386/configure.in: Use LIBC_COMPILER_BUILTIN_INLINED and
+ fail configure if __sync_val_compare_and_swap is not inlined.
+ * sysdeps/i386/configure: Regenerate.
+ * configure.in: Build for i686 when configured for i386.
+ * configure: Regenerate.
+ * README: Remove i386 reference.
+
2013-04-06 Carlos O'Donell <carlos@redhat.com>
* sysdeps/s390/s390-32/sysdep.h: Undefine PSEUDO before redefinition.
* The following bugs are resolved with this release:
- 10357, 11120, 11561, 12723, 13550, 13889, 13951, 14142, 14176, 14200,
- 14317, 14327, 14478, 14496, 14686, 14812, 14920, 14964, 14981, 14982,
- 14985, 14994, 14996, 15003, 15006, 15020, 15023, 15036, 15054, 15055,
- 15062, 15078, 15160, 15214, 15232, 15234, 15283, 15285, 15287, 15304,
- 15305, 15307, 15327, 15330, 15335, 15336, 15337, 15342.
+ 10060, 10062, 10357, 11120, 11561, 12723, 13550, 13889, 13951, 14142,
+ 14176, 14200, 14317, 14327, 14478, 14496, 14686, 14812, 14920, 14964,
+ 14981, 14982, 14985, 14994, 14996, 15003, 15006, 15020, 15023, 15036,
+ 15054, 15055, 15062, 15078, 15160, 15214, 15232, 15234, 15283, 15285,
+ 15287, 15304, 15305, 15307, 15327, 15330, 15335, 15336, 15337, 15342.
* CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
#15078).
In GNU/Hurd systems, it works with a microkernel and Hurd servers.
The GNU C Library implements much of the POSIX.1 functionality in the
-GNU/Hurd system, using configurations i[34567]86-*-gnu. The current
+GNU/Hurd system, using configurations i[4567]86-*-gnu. The current
GNU/Hurd support requires out-of-tree patches that will eventually be
incorporated into an official GNU C Library release.
AC_DEFUN([LIBC_CONFIG_VAR],
[config_vars="$config_vars
$1 = $2"])
+
+dnl Check that function FUNC was inlined as a builtin. The code fragment
+dnl CODE is compiled with additional options CC_OPTION. If FUNC is
+dnl not found in the assembly then it is assumed the compiler has support
+dnl for this builtin and has inlined the call. If the compiler has the
+dnl feature then ACTION-IF-TRUE is called, otherwise ACTION-IF-FALSE.
+dnl It is up to the caller to provide a CC_OPTION that ensures the
+dnl builtin is inlined if present.
+dnl Warning: This may not work for some machines. For example on ARM the
+dnl ABI dictates that some functions should not be inlined and instead
+dnl should be provided by a compiler helper library e.g. __aeabi_memcpy.
+dnl This is done to reduce code size.
+dnl LIBC_COMPILER_BUILTIN([func], [code], [cc_option], [action-if-true], [action-if-false])
+AC_DEFUN([LIBC_COMPILER_BUILTIN_INLINED],
+[AC_MSG_CHECKING([for compiler support of inlined builtin function $1])
+libc_compiler_builtin_inlined=no
+cat > conftest.c <<EOF
+int _start (void) { $2 return 0; }
+EOF
+if ! AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+ $3 -nostdlib -nostartfiles
+ -S conftest.c -o - | fgrep "$1"
+ 1>&AS_MESSAGE_LOG_FD])
+then
+ libc_compiler_builtin_inlined=yes
+fi
+rm -f conftest*
+if test $libc_compiler_builtin_inlined = yes; then
+ $4
+else
+ $5
+fi
+AC_MSG_RESULT($libc_compiler_builtin_inlined)])
;;
esac
+# Configure for i686 if the user asks for i386. We don't support
+# i386 any more but it continues to be common for users to configure
+# 32-bit x86 as i386. We build for i686 instead.
+if test "$machine" = i386; then
+ machine="i686"
+ echo "\
+*** WARNING: Support for i386 is deprecated. Building for i686 instead."
+fi
+
submachine=
# Check whether --with-cpu was given.
;;
esac
+# Configure for i686 if the user asks for i386. We don't support
+# i386 any more but it continues to be common for users to configure
+# 32-bit x86 as i386. We build for i686 instead.
+if test "$machine" = i386; then
+ machine="i686"
+ echo "\
+*** WARNING: Support for i386 is deprecated. Building for i686 instead."
+fi
+
submachine=
AC_ARG_WITH([cpu],
AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
# This file is generated from configure.in by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/i386.
+# 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 $? "
+*** Building with -march=i386/-mcpu=i386 is not supported.
+*** Please use host i786, i686, i586, or i486." "$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. */
"
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/i386.
+# 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.
+LIBC_COMPILER_BUILTIN_INLINED(
+ [__sync_val_compare_and_swap],
+ [int a, b, c; __sync_val_compare_and_swap (&a, b, c);],
+ [-O0],
+ [libc_cv_unsupported_i386=no],
+ [AC_MSG_ERROR([
+*** Building with -march=i386/-mcpu=i386 is not supported.
+*** Please use host i786, i686, i586, or i486.])])
+
AC_CHECK_HEADER([cpuid.h], ,
[AC_MSG_ERROR([gcc must provide the <cpuid.h> header])],
[/* No default includes. */])
projects / thirdparty / glibc.git / commitdiff
