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Re: Build Question: How to Add -Wl, --option Before Objects In Setup.py?

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  Re: Build Question: How to Add -Wl, --option Before Objects In Setup.py? Ned Deily <nad@acm.org> - 2014-10-28 14:01 -0700

#79856 — Re: Build Question: How to Add -Wl, --option Before Objects In Setup.py?

In article 
<CAHu5Pra68EDgkvFYHTQ+SrmB6syew9A1SAbB5CEmLuzqbs5vQg@mail.gmail.com>,
 Cyd Haselton <chaselton@gmail.com> wrote:

> On Tue, Oct 28, 2014 at 3:11 AM, Ned Deily <nad@acm.org> wrote:
> > In article
> > <CAHu5PrY-T=DT3wOg-Y+Va9WgwBV3w9d7M-tu=_N-CNgWsSzGpg@mail.gmail.com>,
> >  Cyd Haselton <chaselton@gmail.com> wrote:
> > [...]
> >> I'm building python on an Android device in the KBOX
> >> environment...which simulates a Unix type filesystem.
> >> Python isn't installed; I'm building from sources (2.7.8) with GCC
> >> 4.8.0 and make.
> >>
> >> The problem with the LDFLAGS approach is that some of the libraries
> >> that must be linked (-lc -ldl) do not need the --allow-shlib-undefined
> >> option...it's only the lpython2.7 that does.  Any way to do this?
> >
> > Sorry, I have no experience with that environment nor an understanding
> > of why you need to specify --allow-shlib-undefined (it seems to be the
> > default in some versions of ld).  You could look at and, if necessary,
> > modify Lib/distutils, the part of the Python standard library that
> > builds extension modules from setup.py.

> No need to apologize.  Also no need to have an understanding of the
> environment; with a few rare exceptions it behaves just like a
> Unix/Linux one.
> 
> The reason why I need to specify --allow-shlib-undefined is for the
> python library; it's throwing undefined references to sincos even
> though the symbol is there. Specifying that option is the only fix
> I've found.
> 
> As mentioned earlier, i'm not familiar with python or its build
> system; which file in the distutils dir do I need to modify?

Perhaps I should apologize for not asking earlier what you are really 
trying to do before suggesting heading down the path of modifying 
Distutils :)  So the issue is with an undefined reference to sincos?  It 
appears that that routine is often supplied in libm.  Is that the case 
on your platform?  And, if so, the right fix might be to supply it 
manually or, better, ensure that Python supplies it as a result of 
running ./configure.  Also, what version of Python are you building?

-- 
 Ned Deily,
 nad@acm.org

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