Hello! On Mon, Oct 09, 2006 at 01:03:57PM +0200, Stepan Kasal wrote: > On Sun, Oct 08, 2006 at 02:16:00PM +0200, Thomas Schwinge wrote: > > $ grep FOO config.h > > /* FOO 1 */ > > #define FOO 0 > ... > > The _first_ definition (i.e. `FOO=0') will be used. > > this bug was fixed in the latest release. Nice. > But even though the fix was intentional, this behaviour is still > undocumented, so the more important part of the answer is what Paul > said: do not do that. > > In detail: > 1) The third parameter, the description, is read by autoheader, when > it is creating config.h.in, and it should be the same for all calls. `should be the same' --- if you require that (and it makes sense, as autoheader otherwise would have to decide which one to use), I could imagine there to be a way to introduce a mechanism that makes sure that all occurrences of `AC_DEFINE' on the same symbol are checked to have the same description fields and complains otherwise. > 2) During the execution of ./configure, only one instance of > AC_DEFINE should be reached. Why? Regards, Thomas
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