Several of the most commonly used Autoconf macros (starting with
AC_CHECK_FUNCS and AC_CHECK_HEADERS) take a whitespace-separated list
of symbols as their primary argument. It would abstractly be best if
this list were _not_ subject to M4 macro expansion, in case there’s a
collision between a M4
The test suite was insisting on using /bin/sh -n for syntax checking,
which meant that if /bin/sh wasn’t one of the short list of shells
whose -n is known to work, we would skip all of the syntax-check
tests, even if some other shell was available that would work.
Instead do like
While investigating something else, I noticed that AC_REPLACE_FUNCS
calls _AH_CHECK_FUNC and AC_LIBSOURCE in the success branch of an
AC_CHECK_FUNC. This doesn’t work; both of those are marker macros
that need to be expanded unconditionally at m4 time so that traces
(placed by autoheader and
