Fix default float_t definition (bug 20855).
The default (top-level) version of bits/mathdef.h defines float_t to
double. It is used on ColdFire, MicroBlaze, Nios II and SH3, all of
which define FLT_EVAL_METHOD to 0, so float_t should be float (and C11
requires a certain correspondence between these typedefs and
FLT_EVAL_METHOD values).
I proposed fixing this default in
<https://sourceware.org/ml/libc-alpha/2015-01/msg00499.html>, with no
objections from architecture maintainers, and this patch makes that
fix. As noted in the NEWS entry added, this might affect the ABIs of
non-glibc libraries (ImageMagick has been mentioned in gcc-patches
discussion of the S/390 case - which is unaffected by this patch), but
as noted in my previous message, affected libraries would have
problems with -mfpmath=sse anyway on 32-bit x86.
A (compilation) testcase is added to verify the required
correspondence of typedefs to FLT_EVAL_METHOD values. This test is
built with -fexcess-precision=standard to avoid any issues with GCC 7
on S/390 providing a more accurate FLT_EVAL_METHOD definition in the
default (no excess precision) mode. (This will also be usable to test
a fix for the recently reported bug about these typedefs on x86_64
-mfpmath=387, as architecture-specific tests can be added that
It is entirely possible that the fixed default makes some
architecture-specific versions of bits/mathdef.h semantically
equivalent to the default version and so no longer required. I don't
intend to investigate that separately from the refactoring I proposed
in <https://sourceware.org/ml/libc-alpha/2016-11/msg00745.html>, which
will create as few header variants as possible for each group of
definitions.
Tested (compilation only) with build-many-glibcs.py.
[BZ #20855]
* bits/mathdef.h (float_t): Define to float.
* math/test-flt-eval-method.c: New file.
* math/Makefile (tests): Add test-flt-eval-method.
(CFLAGS-test-flt-eval-method.c): New variable.
2016-11-23 08:28:30 +08:00
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/* Test evaluation method typedefs match FLT_EVAL_METHOD.
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2017-01-01 08:14:16 +08:00
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Copyright (C) 2016-2017 Free Software Foundation, Inc.
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Fix default float_t definition (bug 20855).
The default (top-level) version of bits/mathdef.h defines float_t to
double. It is used on ColdFire, MicroBlaze, Nios II and SH3, all of
which define FLT_EVAL_METHOD to 0, so float_t should be float (and C11
requires a certain correspondence between these typedefs and
FLT_EVAL_METHOD values).
I proposed fixing this default in
<https://sourceware.org/ml/libc-alpha/2015-01/msg00499.html>, with no
objections from architecture maintainers, and this patch makes that
fix. As noted in the NEWS entry added, this might affect the ABIs of
non-glibc libraries (ImageMagick has been mentioned in gcc-patches
discussion of the S/390 case - which is unaffected by this patch), but
as noted in my previous message, affected libraries would have
problems with -mfpmath=sse anyway on 32-bit x86.
A (compilation) testcase is added to verify the required
correspondence of typedefs to FLT_EVAL_METHOD values. This test is
built with -fexcess-precision=standard to avoid any issues with GCC 7
on S/390 providing a more accurate FLT_EVAL_METHOD definition in the
default (no excess precision) mode. (This will also be usable to test
a fix for the recently reported bug about these typedefs on x86_64
-mfpmath=387, as architecture-specific tests can be added that
It is entirely possible that the fixed default makes some
architecture-specific versions of bits/mathdef.h semantically
equivalent to the default version and so no longer required. I don't
intend to investigate that separately from the refactoring I proposed
in <https://sourceware.org/ml/libc-alpha/2016-11/msg00745.html>, which
will create as few header variants as possible for each group of
definitions.
Tested (compilation only) with build-many-glibcs.py.
[BZ #20855]
* bits/mathdef.h (float_t): Define to float.
* math/test-flt-eval-method.c: New file.
* math/Makefile (tests): Add test-flt-eval-method.
(CFLAGS-test-flt-eval-method.c): New variable.
2016-11-23 08:28:30 +08:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <float.h>
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#include <math.h>
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#if FLT_EVAL_METHOD == -1
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/* Cannot test. */
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typedef float_t my_float_t;
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typedef double_t my_double_t;
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#elif FLT_EVAL_METHOD == 0 || FLT_EVAL_METHOD == 16
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typedef float my_float_t;
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typedef double my_double_t;
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#elif FLT_EVAL_METHOD == 1
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typedef double my_float_t;
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typedef double my_double_t;
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#elif FLT_EVAL_METHOD == 2
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typedef long double my_float_t;
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typedef long double my_double_t;
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#elif FLT_EVAL_METHOD == 32
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typedef _Float32 my_float_t;
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typedef double my_double_t;
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#elif FLT_EVAL_METHOD == 33
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typedef _Float32x my_float_t;
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typedef _Float32x my_double_t;
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#elif FLT_EVAL_METHOD == 64
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typedef _Float64 my_float_t;
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typedef _Float64 my_double_t;
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#elif FLT_EVAL_METHOD == 65
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typedef _Float64x my_float_t;
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typedef _Float64x my_double_t;
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#elif FLT_EVAL_METHOD == 128
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typedef _Float128 my_float_t;
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typedef _Float128 my_double_t;
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#elif FLT_EVAL_METHOD == 129
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typedef _Float128x my_float_t;
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typedef _Float128x my_double_t;
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#else
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# error "Unknown FLT_EVAL_METHOD"
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#endif
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extern float_t test_float_t;
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extern my_float_t test_float_t;
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extern double_t test_double_t;
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extern my_double_t test_double_t;
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/* This is a compilation test. */
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#define TEST_FUNCTION 0
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#include "../test-skeleton.c"
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