Re: Build system cleanup

[Jan Stary <hans@stare.cz>]

> checking for magic.h... no
> checking for zlib.h... yes
> checking for uncompress in -lz... yes
> checking for png.h... no
> checking for mad.h... no
> checking for id3tag.h... no
> checking for lame/lame.h... no
> checking for lame.h... no
> 
> 	$ pkg_info -L lame | grep .h$    
> 	/usr/local/include/lame/lame.h
> 
> 	OpenBSD installs third-party packages into /usr/local/,
> 	but the configure script does not look there; it porbably
> 	only searches in /usr, because that's where linux distributions
> 	install their packages. (I'm not saying it should
> 	-- I will test the same with -I added to the CPPFLAGS,
> 	as the OpenBSD port of SoX does.)

Running ./configure with CPPFLAGS and LDFLAGS,
so that the headers and libraries are found,
as per ./configure --help:

  LDFLAGS   linker flags, e.g. -L<lib dir>
  	    if you have libraries in a nonstandard directory <lib dir>

  CPPFLAGS  (Objective) C/C++ preprocessor flags, e.g. -I<include dir>
            if you have headers in a nonstandard directory <include dir>

I am looking at png as an example.

With plain ./configure , png.h (which is /usr/local/include/png.h)
is not found, as described above.

  checking for png.h... no

With ./configure CPPFLAGS='-I/usr/local/include' the png.h header is found,
but the library is not, unsurprisingly. But:

  $ ./configure CPPFLAGS='-I/usr/local/include'
  [...]
  checking for png.h... yes
  checking for png_set_rows in -l101... no

I have no idea how the -l101 got there.

  checking for mad.h... yes
  checking for mad_stream_buffer in -l101... no
  checking for id3tag.h... yes
  checking for id3_file_open in -l101... no
  checking for lame/lame.h... yes
  checking for lame_init in -l101... no
  checking for twolame.h... yes
  checking for twolame_init in -l101... no
  checking for gsm/gsm.h... no
  checking for gsm.h... yes
  checking for gsm_create in -l101... no

Apparently, all the external library functions
are searched for in 'lib101' now.

Adding LDFLAGS='-L/usr/local/lib' so that the actual libraries
are found result in the same:

  $ ./configure CPPFLAGS='-I/usr/local/include' LDFLAGS='-L/usr/local/lib'
  [...]
  checking for png.h... yes
  checking for png_set_rows in -l101... no
  checking for mad.h... yes
  checking for mad_stream_buffer in -l101... no
  checking for id3tag.h... yes
  checking for id3_file_open in -l101... no
  checking for lame/lame.h... yes
  checking for lame_init in -l101... no
  checking for twolame.h... yes
  checking for twolame_init in -l101... no
  checking for gsm/gsm.h... no
  checking for gsm.h... yes
  checking for gsm_create in -l101... no

For some others, the check seems sensible:

  checking for wavpack/wavpack.h... yes
  checking for WavpackGetSampleRate in -lwavpack... no

But:

  $ nm /usr/local/lib/libwavpack.so.0.3 | grep WavpackGetSampleRate
  0000b8e0 T WavpackGetSampleRate

For some, the check is sane and the detection is correct:

  checking for sndio.h... yes
  checking for sio_open in -lsndio... yes

Then again:

  checking for ao/ao.h... yes
  checking for ao_play in -lao... no

  $ nm /usr/local/lib/libao.so.5.0 | grep ao_play 
  000067c0 T ao_play

Sndfile too:

  checking for sndfile.h... yes
  checking for sf_open_virtual in -l101... no


Jan



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