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| author | Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> | 2019-10-20 16:00:30 -0500 |
|---|---|---|
| committer | Gabriel F. T. Gomes <gabrielftg@linux.ibm.com> | 2019-12-27 15:02:10 -0300 |
| commit | 1ef9b6e0bf1268050e74087c4f6bd056263a28c7 (patch) | |
| tree | 3b3f7905c03c4890473ab9da3e7fdc5dbb42241e /sysdeps/ieee754/ldbl-128ibm-compat/bits | |
| parent | 863d775c481704baaa41855fc93e5a1ca2dc6bf6 (diff) | |
| download | glibc-1ef9b6e0bf1268050e74087c4f6bd056263a28c7.tar glibc-1ef9b6e0bf1268050e74087c4f6bd056263a28c7.tar.gz glibc-1ef9b6e0bf1268050e74087c4f6bd056263a28c7.tar.bz2 glibc-1ef9b6e0bf1268050e74087c4f6bd056263a28c7.zip | |
Do not redirect calls to __GI_* symbols, when redirecting to *ieee128
On platforms where long double has IEEE binary128 format as a third
option (initially, only powerpc64le), many exported functions are
redirected to their __*ieee128 equivalents. This redirection is
provided by installed headers such as stdio-ldbl.h, and is supposed to
work correctly with user code.
However, during the build of glibc, similar redirections are employed,
in internal headers, such as include/stdio.h, in order to avoid extra
PLT entries. These redirections conflict with the redirections to
__*ieee128, and must be avoided during the build. This patch protects
the second redirections with a test for __LONG_DOUBLE_USES_FLOAT128, a
new macro that is defined to 1 when functions that deal with long double
typed values reuses the _Float128 implementation (this is currently only
true for powerpc64le).
Tested for powerpc64le, x86_64, and with build-many-glibcs.py.
Co-authored-by: Gabriel F. T. Gomes <gabrielftg@linux.ibm.com>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm-compat/bits')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm-compat/bits/long-double.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/bits/long-double.h b/sysdeps/ieee754/ldbl-128ibm-compat/bits/long-double.h new file mode 100644 index 0000000000..02d1b40169 --- /dev/null +++ b/sysdeps/ieee754/ldbl-128ibm-compat/bits/long-double.h @@ -0,0 +1,29 @@ +/* Properties of long double type. ldbl-opt version. + Copyright (C) 2019 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#ifndef __NO_LONG_DOUBLE_MATH +# define __LONG_DOUBLE_MATH_OPTIONAL 1 +# ifndef __LONG_DOUBLE_128__ +# define __NO_LONG_DOUBLE_MATH 1 +# endif +#endif +/* On platforms that reuse the _Float128 implementation for IEEE long + double, access to the correct long double functions is selected based + on the long double mode being used during the compilation. On + powerpc64le, this is true when -mabi=ieeelongdouble is in use. */ +#define __LONG_DOUBLE_USES_FLOAT128 (__LDBL_MANT_DIG__ == 113) |