Re: [Caml-list] building OCaml on SCO UnixWare 7.01 system (problems)

[Xavier Leroy <xavier.leroy@inria.fr>]

> During the compilation process (with both GCC 2.95 and the SCO 
> Development System CC compiler), I get the following errors:
> 
>          gcc -I../../byterun -O -fno-defer-pop -Wall -Wno-unused
>   	    -D_FILE_OFFSET_BITS=64  -g -c scheduler.c
> 	scheduler.c:97: conflicting types for `thread_t'
> 	/usr/include/sys/types.h:305: previous declaration of `thread_t'
> 	*** Error code 1 (bu21)
> 	UX:make: ERROR: fatal error.

That's a "namespace pollution" error: the system's include files
define things that they should not according to a number of recent
Unix standards such as SUS and Unix98.  (I must resist making an SCO joke at
that point.)

A trick that may work (it was helpful to work around a similar problem
on AIX) is to specify "-D_XOPEN_SOURCE=500":

        ./configure -cc "cc -D_XOPEN_SOURCE=500"

There might be a manual page explaining those standard conformance
directives; on Solaris and Digital Unix, it's standards(5).

Hope this helps,

- Xavier Leroy

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