On 03/27/2010 04:48 PM, Steve Goetze wrote: > I'm trying to port autoconf to z/os, which uses an EBCDIC codeset. > I'm having trouble with autoconf where AC_CHECK_HEADERS_ONCE is > causing a bad string to be emitted to config.h.in. > > For example, what should be "HAVE_STRING_H" is appearing as "_____STRING_H". Thanks for the report. > When tracing the call to m4_translit, I see that the second argument > (the one that uses m4_cr_not_symbols2) looks something like this: > > *[]abcdefghijklmnopqrstuvwxyz...<(+|&.........!HAVE_string.h);^/-... > > The ... represent ranges of mostly unprintable characters. In the > middle of the argument, the HAVE_string.h is embedded, > inappropriately. Probably unfortunately in the EBCDIC codeset, the > characters !,$,*,) are adjacent; it appears as if the $* is being > interpolated to "HAVE_string.h". That is _exactly_ what is causing the problem. This is certainly a bug in autoconf, although EBCDIC is so infrequently encountered that no one else has ever mentioned it. It is only $* that is problematic; $! is just fine. So, the trick is to figure out how to make m4_cr_not_symbols2 rearrange the symbols to be in an order that does not interfere with m4 processing. > > At this point, I'm stuck - I'd appreciate any suggestions on how to > fix this, or even report it as a bug. You have already reported it as a bug. However, as I don't have access to an EBCDIC machine, I will need your help to fix it. The fix will be in lib/m4sugar/m4sugar.m4, in the places where all the m4_cr_* macros are defined, but I'm not exactly sure what to define them to while still being friendly to your encoding. -- Eric Blake eblake@xxxxxxxxxx +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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