Re: [PATCH] build: avoid link failure on systems using gnulib's fcntl but not open

[Bruno Haible]

> ... change the expansion of @GNULIB_OPEN@ in lib/fcntl.in.h
> so that it expands to
>   defined IN_GREP_GNULIB_TESTS
> instead of to 1

Actually I made it expand to
    IN_GREP_GNULIB_TESTS
not
    defined IN_GREP_GNULIB_TESTS
because I wanted to use the same expansion also for the GNULIB_OPEN C macro,
and preprocessor instructions like

   #define GNULIB_OPEN     defined IN_GREP_GNULIB_TESTS
   #if GNULIB_OPEN
   ...
   #endif

are not valid C. (I know no compiler which chokes on that, but that doesn't
change the fact that it has "undefined behavior" in ISO C99.)

Bruno