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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
References: <CALM2mE=VO3VkS3EdP4GhZRudyxcgJNQwH3vFqBUmdY3Ze3kBwQ@mail.gmail.com>
 <20171026022332.GA2292@troutmask.apl.washington.edu>
Date: Thu, 26 Oct 2017 08:29:35 -0500
In-Reply-To: <20171026022332.GA2292@troutmask.apl.washington.edu> (Steve
 Kargl's message of "Wed, 25 Oct 2017 19:23:32 -0700")
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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?