[Buildroot] AC_CHECK_LIB doesn't work for cross-compiling

[Baruch Siach <baruch@tkos.co.il>]

Hi Adam,

On Thu, Dec 25, 2014 at 01:34:59PM +0900, Adam Jiang wrote:
> I am trying to add a new package to buildroot. the package is built upon
> autotools. thus, it is supposed to be very easy to make it
> cross-compilable. ever, i got suck at AC_CHECK_LIB macro. it doesn't
> work well at cross-compiling while it does work on normal compiling.
> 
> AC_CHECK_LIB([fcgi], [FCGX_InitRequest], [AC_MSG_WARN("unable to find
> the FCGX_InitRequest() function")])
> 
> always failed even though I do have libfcgi in my configuration. The
> error message looks like
> 
> checking for FCGX_InitRequest in -lfcgi... no
> configure: WARNING: unable to find the FCGX_InitRequest() function
> 
> I don't think AC_CHECK_LIB will not work on cross-compiling because it
> seems there are lots of other target packages in buildroot using the
> macro. Most probably, I am doing something wrong.
> 
> Does AC_CHECK_LIB work in buildroot? If the macro needs some changes,
> how could I do it?

What do you have in config.log for the FCGX_InitRequest check?

baruch

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