Date: Thu, 26 Oct 2017 16:49:45 +0800 From: blubee blubeeme <gurenchan@gmail.com> To: Bob Eager <rde@tavi.co.uk> Cc: FreeBSD Ports <freebsd-ports@freebsd.org> Subject: Re: can't link against math.h Message-ID: <CALM2mEm8DwJvubLvuqYYgA0saPB0f7a2wXY4TJoanm0pPjAgNw@mail.gmail.com> In-Reply-To: <20171026094155.39fb5f14@raksha.tavi.co.uk> References: <CALM2mE=VO3VkS3EdP4GhZRudyxcgJNQwH3vFqBUmdY3Ze3kBwQ@mail.gmail.com> <20171026094155.39fb5f14@raksha.tavi.co.uk>
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Thanks for the tips
I didn't know that it wasn't in the std c library and was GNU specific
code. I think I'll take Montgomery-Smith
advice and implement it as this:
#define exp10f(x) (powf(10.,x))
Porting software is some interesting work.
On Thu, Oct 26, 2017 at 4:41 PM, Bob Eager <rde@tavi.co.uk> wrote:
> On Thu, 26 Oct 2017 10:05:00 +0800
> blubee blubeeme <gurenchan@gmail.com> 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?
>
> It's not in the C standard (C99 or C11). So why would it be available?
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