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Use clog10 not __clog10 in tgmath.h log10 macro.

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As a GNU extension, for _GNU_SOURCE glibc's complex.h provides a
clog10 function and tgmath.h supports complex arguments to the log10
macro.  However, tgmath.h uses __clog10 not clog10 in defining the
macro.

There is no namespace reason (ignoring the block-scope namespace
issues that would apply equally to *every* function called by tgmath.h
macros) for using __clog10 here, since this is only for _GNU_SOURCE so
clog10 is always visible when this macro definition is used.
Furthermore, __clog10f128 is not exported, so supporting _Float128 in
tgmath.h implies using clog10 not __clog10 there.  (__clog10 and
clog10 aren't used in libstdc++ either, although that library would
have a good case for using the __clog10 reserved-namespace export: the
standard C++ library includes log10 of a complex number.)  This patch
duly changes the header to use clog10, and enables tests of the macro
for complex arguments.

Tested for x86_64.

	* math/tgmath.h [__USE_GNU] (log10): Use clog10 not __clog10.
	* math/gen-tgmath-tests.py (Tests.add_all_tests): Test log10 for
	complex arguments.
This commit is contained in:
Joseph Myers 2017-06-28 16:43:50 +00:00
parent d12a22c5d3
commit 0908a38adc
3 changed files with 8 additions and 2 deletions
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4
ChangeLog
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@ -1,5 +1,9 @@
2017-06-28 Joseph Myers <joseph@codesourcery.com>
* math/tgmath.h [__USE_GNU] (log10): Use clog10 not __clog10.
* math/gen-tgmath-tests.py (Tests.add_all_tests): Test log10 for
complex arguments.
[BZ #21687]
* math/tgmath.h (__TGMATH_BINARY_REAL_RET_ONLY): New macro.
(totalorder): Use it.

4
math/gen-tgmath-tests.py
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@ -497,7 +497,9 @@ class Tests(object):
self.add_tests('lgamma', 'r', ['r'])
self.add_tests('llrint', 'long long int', ['r'])
self.add_tests('llround', 'long long int', ['r'])
self.add_tests('log10', 'r', ['r'])
# log10 is real-only in ISO C, but supports complex arguments
# as a GNU extension.
self.add_tests('log10', 'g', ['g'])
self.add_tests('log1p', 'r', ['r'])
self.add_tests('log2', 'r', ['r'])
self.add_tests('logb', 'r', ['r'])

2
math/tgmath.h
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@ -319,7 +319,7 @@
/* Base-ten logarithm of X. */
#ifdef __USE_GNU
# define log10(Val) __TGMATH_UNARY_REAL_IMAG (Val, log10, __clog10)
# define log10(Val) __TGMATH_UNARY_REAL_IMAG (Val, log10, clog10)
#else
# define log10(Val) __TGMATH_UNARY_REAL_ONLY (Val, log10)
#endif