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Do not redirect calls to __GI_* symbols, when redirecting to *ieee128

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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>
This commit is contained in:
Tulio Magno Quites Machado Filho
2019-10-20 16:00:30 -05:00
committed by Gabriel F. T. Gomes
parent 863d775c48
commit 1ef9b6e0bf
10 changed files with 48 additions and 2 deletions
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1
sysdeps/unix/sysv/linux/sparc/sparc64/bits/long-double.h
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@ -24,3 +24,4 @@
# define __NO_LONG_DOUBLE_MATH 1
# endif
#endif
#define __LONG_DOUBLE_USES_FLOAT128 0