osf 4 cc versus _AC_PROG_CC_STDC

[Kevin Ryde]

        * lib/autoconf/c.m4 (_AC_PROG_CC_STDC): Extend test program to get an
        error from OSF 4.0 Compaq C in its default almost-ANSI mode, so that
        we add -std1.

I'm hoping an expression like

        int osf4_cc_array ['\x00' == 0 ? 1 : -1];

can reasonably be expected to pass on all ansi compilers.  It's
similar to the sizeof probes at least.

c.m4.osf4-stdc.diff
Description: Text document