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77e408383e
* lib/math.in.h (logb): Ensure declaration. Replace if REPLACE_LOGB is 1. * lib/logb.c: New file. * m4/logb.m4 (gl_FUNC_LOGB_WORKS): New macro. (gl_FUNC_LOGB): Invoke it. Set HAVE_LOGB, REPLACE_LOGB. * m4/math_h.m4 (gl_MATH_H_DEFAULTS): Initialize REPLACE_LOGB. * modules/math (Makefile.am): Substitute REPLACE_LOGB. * modules/logb (Files): Add lib/logb.c. (Depends-on): Add isfinite, frexp, isnand. (configure.ac): Compile the replacement code logb.c if needed. * tests/test-math-c++.cc: Check the declaration of logb. * doc/posix-functions/logb.texi: Mention the replacement and the bug with subnormal numbers.
36 lines
543 B
Plaintext
36 lines
543 B
Plaintext
Description:
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logb() function: get exponent.
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Files:
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lib/logb.c
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m4/logb.m4
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m4/mathfunc.m4
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Depends-on:
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math
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extensions
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isfinite [test $HAVE_LOGB = 0 || test $REPLACE_LOGB = 1]
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frexp [test $HAVE_LOGB = 0 || test $REPLACE_LOGB = 1]
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isnand [test $HAVE_LOGB = 0 || test $REPLACE_LOGB = 1]
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configure.ac:
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gl_FUNC_LOGB
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if test $HAVE_LOGB = 0 || test $REPLACE_LOGB = 1; then
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AC_LIBOBJ([logb])
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fi
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gl_MATH_MODULE_INDICATOR([logb])
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Makefile.am:
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Include:
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<math.h>
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Link:
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$(LOGB_LIBM)
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License:
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LGPL
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Maintainer:
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Bruno Haible
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