Date: Thu, 26 Oct 2017 08:29:35 -0500 From: Dan Mack <mack@macktronics.com> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: blubee blubeeme <gurenchan@gmail.com>, FreeBSD Ports <freebsd-ports@freebsd.org>, FreeBSD current <freebsd-current@freebsd.org> Subject: Re: can't link against math.h Message-ID: <m2h8umhwao.fsf@macktronics.com> In-Reply-To: <20171026022332.GA2292@troutmask.apl.washington.edu> (Steve Kargl's message of "Wed, 25 Oct 2017 19:23:32 -0700") References: <CALM2mE=VO3VkS3EdP4GhZRudyxcgJNQwH3vFqBUmdY3Ze3kBwQ@mail.gmail.com> <20171026022332.GA2292@troutmask.apl.washington.edu>
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% man 3 exp
| NAME
| exp, expf, expl, exp2, exp2f, exp2l, expm1, expm1f, expm1l, pow, powf,
| powl - exponential and power functions
gives a good summary as well.
Dan
Steve Kargl <sgk@troutmask.apl.washington.edu> writes:
> On Thu, Oct 26, 2017 at 10:05:00AM +0800, blubee blubeeme wrote:
>> I wrote a simple test program to test and see if math.h has the function:
>> exp10f
>> #include <math.h>
>>
>> int main(int argc, char** argv)
>> {
>> (void)argv;
>> return ((int*)(&exp10))[argc];
>> }
>>
>> tried compiling it with clang:
>> clang++ test.cpp -o test -lm
>> test.cpp:7:17: error: use of undeclared identifier 'expf10'
>> return ((int*)(&expf10))[argc];
>> ^
>> 1 error generated.
>>
>> tried with gcc:
>> gcc test.cpp -o test -lm
>> test.cpp: In function 'int main(int, char**)':
>> test.cpp:7:17: error: 'expf10' was not declared in this scope
>> return ((int*)(&expf10))[argc];
>>
>> Does FreeBSD math.h have expf10 and if so, how do I link against it?
>
> No. You could answer this question with a simple grep on math.h.
>
> Which C standard specifies exp10f or expf10?
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