[Octave-bug-tracker] [bug #44976] configure test for sndfile not good enough

[Rik]

Follow-up Comment #2, bug #44976 (project octave):

The second approach, just testing for some features we need, will probably be
easier.  After libsnd is detected you could write a small test program for
configure.ac that includes the appropriate library headers and then tries to
use one of the constants.

Look in m4/acinclude.m4 for inspiration.  Here is something for checking
Qscintialla which I think could be used.


AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
    #include <Qsci/qsciglobal.h>
    ]], [[
    #if QSCINTILLA_VERSION < 0x020600
    #error Old FindFirst function found.
    #endif
    ]])],
  octave_cv_version_2_6_0=yes,
  octave_cv_version_2_6_0=no)


SW_FORMAT_OGG is an enum in sndfile.h so I don't know if you could get by with
AC_PREPROC_IFELSE, or whether you actually need to use AC_COMPILE_IFELSE to
compile the program too.


AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[
    #include <sndfile.h>
    ]], [[
    #if SF_FORMAT_OGG
    #endif
    ]])],
  octave_cv_sndfile_good=yes,
  octave_cv_sndfile_good=no)




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