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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/49797] New: CLooG use of LANGUAGE_C conflicts with MIPS compilers
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49797

           Summary: CLooG use of LANGUAGE_C conflicts with MIPS compilers
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ro@gcc.gnu.org
                CC: spop@gcc.gnu.org
              Host: mips-sgi-irix6.5
            Target: mips-sgi-irix6.5
             Build: mips-sgi-irix6.5


When trying a mips-sgi-irix6.5 bootstrap with C++ in stages 2 and 3, I failed
due to an issue that had been hidden previously: I'm building with ppl/cloog.
Building ClooG initially failed since gcc (or any compiler on MIPS) predefines
LANGUAGE_C, which is also used by <cloog/pprint.h>.  As a hack, I renamed those
defines to CLOOG_LANGUAGE_C and CLOOG_LANGUAGE_FORTRAN, not noticing that
graphite-clast-to-gimple.c has a use of LANGUAGE_C and now got the wrong value.

When compiling with g++, LANGUAGE_C isn't defined any longer and the build
breaks:

/vol/gcc/src/hg/trunk/local/gcc/graphite-clast-to-gimple.c: In function
'CloogOptions* set_cloog_options()':
/vol/gcc/src/hg/trunk/local/gcc/graphite-clast-to-gimple.c:1309:23: error:
'LANGUAGE_C' was not declared in this scope
make[3]: *** [graphite-clast-to-gimple.o] Error 1

The question is how best to fix this?  One might change upstream CLooG to use
CLOOG_LANGUAGE_C instead to avoid the clash, test for that in
graphite-clast-to-gimple.c
and require MIPS users to upgrade or fix their local copies?