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The first argument of AC_COMPILE_IFELSE needs to be wrapped with
AC_LANG_SOURCE.
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OpenWatcom 1.8 has a C99 mode, which implements _Bool and
<stdbool.h>. Unfortunately the implementation is broken, and doesn't
let _Bool be implicitly converted to integer (as required by the C99
spec). Detect this case in autoconf.
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We can actually test for the options being accepted, rather than try
to test for gcc; this handles differences between gcc versions as well
as compilers with a similar command line set.
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