Re: AC_CHECK_HEADERS w/o arguments

[Akim Demaille]

 > Hi,

 > autoconf-2.57 silently accepts using AC_CHECK_HEADERS without arguments
 > (Yes, I know this is agains autoconf's documentation), eg. accepts
 > configure.ac's containing something like this

 > AC_CHECK_HEADERS
 > AC_PROG_CC

 > Neither autoconf, m4 nor any tool else complains about this usage of
 > AC_CHECK_HEADERS.

 > This results into configure-scripts containing
 > ..
 > for ac_headers in
 > do
 > ..

 > Some shells accept this kind of for-loops, bug some don't (Including my
 > RH-8.x bash-2.05b-16 didn't complain, while some RH-7.3's bash-2.05 are
 > reported to abort), rendering this bug very hard to find.

I don't want to clutter Autoconf with such checks, because GNU M4 will
provide a means to provide prototypes for macros.  Then, this will be
handled gracefully.