[Python-bugs-list] [ python-Bugs-595545 ] gcc warning about __builtin_fabsf

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Bugs item #595545, was opened at 2002-08-15 09:49
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=595545&group_id=5470

Category: Extension Modules
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Skip Montanaro (montanaro)
Assigned to: Tim Peters (tim_one)
Summary: gcc warning about __builtin_fabsf

Initial Comment:
While compiling a third-party extension (see readyexec.sf.net), I 
got this output running setup.py:

gcc -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -fPIC 
-I/usr/local/include/python2.3 -c fdpass.c -o 
build/temp.linux-i686-2.3/fdpass.o -Wall -Wpointer-arith 
-Wcast-qual -Wcast-align -Wconversion -Waggregate-return 
-Wstrict-prototypes -Wmissing-prototypes 
-Wmissing-declarations -Wnested-externs
In file included from /usr/include/math.h:350,
                 from /usr/local/include/python2.3/pyport.h:92,
                 from /usr/local/include/python2.3/Python.h:48,
                 from fdpass.c:11:
/usr/include/bits/mathinline.h: In function `fabsf':
/usr/include/bits/mathinline.h:446: warning: passing arg 1 of 
`__builtin_fabsf' as `float' rather than `double' due to prototype
gcc -shared build/temp.linux-i686-2.3/fdpass.o -o 
build/lib.linux-i686-2.3/fdpass.so

The extension wasn't using fabs, though I notice the addition of 
-Wstrict-prototypes to the gcc command, so maybe this is a "not 
to worry" sort of thing.

Relevant (I think) information about the system is:

    glibc 2.2.4 (the source of /usr/include/bits/mathinline.h)
    gcc 2.96

The chunk of code in mathinline.h involving __builtin_fabsf is

#if __GNUC_PREREQ (2, 8)
__inline_mathcodeNP_ (double, fabs, __x, return __builtin_fabs 
(__x))
__inline_mathcodeNP_ (float, fabsf, __x, return __builtin_fabsf 
(__x))
__inline_mathcodeNP_ (long double, fabsl, __x, return 
__builtin_fabsl (__x))
__inline_mathcodeNP_ (long double, __fabsl, __x, return 
__builtin_fabsl (__x))
#else
__inline_mathop (fabs, "fabs")
__inline_mathop_ (long double, __fabsl, "fabs")
#endif


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