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author | Gabriel F. T. Gomes <gabriel@inconstante.eti.br> | 2017-09-20 15:10:26 -0300 |
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committer | Gabriel F. T. Gomes <gabriel@inconstante.eti.br> | 2017-09-22 14:47:16 -0300 |
commit | c5c4a626098ec884b8527356abdf2a4bb7b6bf27 (patch) | |
tree | 0f8f63a5117bb8df4972968ebccc3b9dc9547628 /sysdeps/ieee754/flt-32/s_modff.c | |
parent | 23947846658fd41875381c0bcc05b319c3c7bde4 (diff) | |
download | glibc-c5c4a626098ec884b8527356abdf2a4bb7b6bf27.tar.gz glibc-c5c4a626098ec884b8527356abdf2a4bb7b6bf27.tar.xz glibc-c5c4a626098ec884b8527356abdf2a4bb7b6bf27.zip |
Let fpclassify use the builtin when optimizing for size in C++ mode (bug 22146)
When optimization for size is on (-Os), fpclassify does not use the type-generic __builtin_fpclassify builtin, instead it uses __MATH_TG. However, when library support for float128 is available, __MATH_TG uses __builtin_types_compatible_p, which is not available in C++ mode. On the other hand, libstdc++ undefines (in cmath) many macros from math.h, including fpclassify, so that it can provide its own functions. However, during its configure tests, libstdc++ just tests for the availability of the macros (it does not undefine them, nor does it provide its own functions). Finally, when libstdc++ is configured with optimization for size enabled, its configure tests include math.h and get the definition of fpclassify that uses __MATH_TG (and __builtin_types_compatible_p). Since libstdc++ does not undefine the macros during its configure tests, they fail. This patch lets fpclassify use the builtin in C++ mode, even when optimization for size is on. This allows the configure test in libstdc++ to work. Tested for powerpc64le and x86_64. [BZ #22146] math/math.h: Let fpclassify use the builtin in C++ mode, even when optimazing for size.
Diffstat (limited to 'sysdeps/ieee754/flt-32/s_modff.c')
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