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powerpc64le: Check for compiler features for float128

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On powerpc64le, support for float128 will be enabled, which requires some
compiler features to be present.  This patch adds a configure test to check
for such features, which are provided for powerpc64le since GCC 6.2.

Tested for powerpc64 and powerpc64le.

	* INSTALL: Regenerate.
	* manual/install.texi (Recommended Tools for Compilation): Mention
	the powerpc64le-specific requirement in the manual.
	* sysdeps/powerpc/powerpc64le/configure.ac: New file with checks
	for the compiler features required for building float128.
	* sysdeps/powerpc/powerpc64le/configure: New, auto-generated file.
This commit is contained in:
Gabriel F. T. Gomes 2016-10-11 13:50:19 -03:00
parent d54bb9b1d3
commit 4efe3ce400
5 changed files with 96 additions and 0 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2017-06-26 Gabriel F. T. Gomes <gftg@linux.vnet.ibm.com>
Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* INSTALL: Regenerate.
* manual/install.texi (Recommended Tools for Compilation): Mention
the powerpc64le-specific requirement in the manual.
* sysdeps/powerpc/powerpc64le/configure.ac: New file with checks
for the compiler features required for building float128.
* sysdeps/powerpc/powerpc64le/configure: New, auto-generated file.
2017-06-26 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* malloc/tst-alloc_buffer.c (test_misaligned): Cast to char

5
INSTALL
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@ -428,6 +428,11 @@ build the GNU C Library:
better code. As of release time, GCC 6.3 is the newest compiler
verified to work to build the GNU C Library.
For PowerPC 64-bits little-endian (powerpc64le), GCC 6.2 or higher
is required. This compiler version is the first to provide the
features required for building the GNU C Library with support for
'_Float128'.
For multi-arch support it is recommended to use a GCC which has
been built with support for GNU indirect functions. This ensures
that correct debugging information is generated for functions

4
manual/install.texi
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@ -475,6 +475,10 @@ the newest version of the compiler that is known to work for building
release time, GCC 6.3 is the newest compiler verified to work to build
@theglibc{}.
For PowerPC 64-bits little-endian (powerpc64le), GCC 6.2 or higher is
required. This compiler version is the first to provide the features
required for building @theglibc{} with support for @code{_Float128}.
For multi-arch support it is recommended to use a GCC which has been built with
support for GNU indirect functions. This ensures that correct debugging
information is generated for functions selected by IFUNC resolvers. This

45
sysdeps/powerpc/powerpc64le/configure vendored Normal file
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@ -0,0 +1,45 @@
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
# Local configure fragment for sysdeps/powerpc/powerpc64le.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if $CC supports binary128 floating point type" >&5
$as_echo_n "checking if $CC supports binary128 floating point type... " >&6; }
if ${libc_cv_compiler_powerpc64le_binary128_ok+:} false; then :
$as_echo_n "(cached) " >&6
else
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror -mfloat128"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
__float128 a, b, c, d, e;
int i;
__float128
foobar (__float128 x)
{
a = __builtin_nansq ("0");
b = __builtin_huge_valq ();
c = __builtin_infq ();
d = __builtin_fabsq (x);
e = __builtin_nanq ("0");
i = __builtin_signbit (x);
return __builtin_copysignq (x, x);
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
libc_cv_compiler_powerpc64le_binary128_ok=yes
else
libc_cv_compiler_powerpc64le_binary128_ok=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
CFLAGS="$save_CFLAGS"
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_compiler_powerpc64le_binary128_ok" >&5
$as_echo "$libc_cv_compiler_powerpc64le_binary128_ok" >&6; }
if test "$libc_cv_compiler_powerpc64le_binary128_ok" != "yes"; then :
critic_missing="$critic_missing binary128 floating point type (GCC >= 6.2) is required on powerpc64le."
fi
test -n "$critic_missing" && as_fn_error $? "*** $critic_missing" "$LINENO" 5

32
sysdeps/powerpc/powerpc64le/configure.ac Normal file
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@ -0,0 +1,32 @@
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/powerpc/powerpc64le.
dnl Require binary128 floating point support on powerpc64le (available in
dnl GCC 6.2).
AC_CACHE_CHECK([if $CC supports binary128 floating point type],
libc_cv_compiler_powerpc64le_binary128_ok, [dnl
save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -Werror -mfloat128"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
__float128 a, b, c, d, e;
int i;
__float128
foobar (__float128 x)
{
a = __builtin_nansq ("0");
b = __builtin_huge_valq ();
c = __builtin_infq ();
d = __builtin_fabsq (x);
e = __builtin_nanq ("0");
i = __builtin_signbit (x);
return __builtin_copysignq (x, x);
}
]])],
[libc_cv_compiler_powerpc64le_binary128_ok=yes],
[libc_cv_compiler_powerpc64le_binary128_ok=no])
CFLAGS="$save_CFLAGS"])
AS_IF([test "$libc_cv_compiler_powerpc64le_binary128_ok" != "yes"],
[critic_missing="$critic_missing binary128 floating point type (GCC >= 6.2) is required on powerpc64le."])
test -n "$critic_missing" && AC_MSG_ERROR([*** $critic_missing])