Re: return values of test programs in *.m4 macros

[Bruno Haible]

Hi Eric,

> If the particular
> combination of failures matches 63, 77, or 99 (as commonly used by
> automake and autoconf to mean version mismatch, skip, or hard fail),
> then the configure script might misbehave.

In the generated configure scripts, AC_RUN_IFELSE tests for an exit
code equal to 0 and nothing else. And this cannot change, because it's
documented behaviour of AC_RUN_IFELSE:

 -- Macro: AC_RUN_IFELSE (INPUT, [ACTION-IF-TRUE], [ACTION-IF-FALSE],
          [ACTION-IF-CROSS-COMPILING])
     If PROGRAM compiles and links successfully and returns an exit
     status of 0 when executed, run shell commands ACTION-IF-TRUE.
     Otherwise, run shell commands ACTION-IF-FALSE.

So, there is no problem now, and there cannot be a problem in the
future.

Bruno