Re: unreliable detection of universal builds in AC_C_BIGENDIAN

[Bruno Haible]

Eric Blake asked:
> How likely is it that -arch appears multiple times, but always with the
> same argument?

10% to 30%, I'd say. You also often see build command lines with duplicated
-Wall. Why? Because
  - some people specify the same flags through both CC and CFLAGS,
  - with multiple layers of software built on top of autoconf (automake,
    the KDE 3 build system etc.), these layers are likely to specify
    commonplace options like -arch or -Wall independently.

Bruno