Re: [bug-gnulib] inline.m4: use compiler, not cpp

[Bruno Haible]

Paul Eggert wrote:
> whenever you get into trouble, just do "make clean"
> and then make with the CFLAGS you prefer.

Many hackers probably use the same approach... Since "make CFLAGS=..." does
not pass the CFLAGS down to subdirectories, the user of a package with
  - its main sources in the main directory,
  - gnulib sources in a subdirectory,
will, after doing
  $ ./configure
  $ make
  $ make clean
  $ make CFLAGS="-g -O0"
be trapped in the link error: xmalloc.c, compiled with optimization, will
not define xnmalloc, whereas the main sources, compiled without optimization,
will require it.

So I think it's more robust (i.e. it will minimize user frustration) if
we test __NO_INLINE__ at configure time, not at compile time.

Bruno