Can you please elaborate why this patch is necessary? configure either
#undefs the macro or #defines it to 1, so #if and #ifdef should behave
identically.
Unfortunately configure does not work in the way you described,
see snippet of generated config.h bellow
The reason is that configure.ac contains:
AC_DEFINE(HAVE_OSS,, [support oss sound interface])
AC_DEFINE(HAVE_OSS_LINUX,, [linux oss system])
AC_DEFINE(HAVE_OSS_SYS,, [soundcard.h in sys])
AC_DEFINE(HAVE_OSS_MACHINE,, [soundcard.h in machine])
Iff it would contain
AC_DEFINE(HAVE_OSS,1, [support oss sound interface])
AC_DEFINE(HAVE_OSS_LINUX,1, [linux oss system])
AC_DEFINE(HAVE_OSS_SYS,1, [soundcard.h in sys])
AC_DEFINE(HAVE_OSS_MACHINE,1, [soundcard.h in machine])
it would work in the way you described.
Current (wrong) behaviour can be demonstrated by compiling
following snippet.
**************************
#define PROP2
#if PROP1
#warning PROP1 detected
#elif PROP2
#warning PROP2 detected
#else
#warning no PROP detected
#endif
int main(){};
**************************
It works on Linux, because HAVE_OSS_LINUX test is 1st and uses #ifdef.
Petr
****************************************************
/* Define to 1 if you have the `munmap' function. */
#define HAVE_MUNMAP 1
/* Define to 1 if you have the <nl_types.h> header file. */
#define HAVE_NL_TYPES_H 1
/* support oss sound interface */
#define HAVE_OSS
/* linux oss system */
/* #undef HAVE_OSS_LINUX */
/* soundcard.h in machine */
/* #undef HAVE_OSS_MACHINE */
/* soundcard.h in sys */
#define HAVE_OSS_SYS
/* Define if you have POSIX threads libraries and header files. */
/* #undef HAVE_PTHREAD */
/* have pthread_sigmask function */
#define HAVE_PTHREAD_SIGMASK
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