[Bug testsuite/40002] New: Testsuite not finding libc headers with cross builds and only previous version of GCC installed

[pinskia at gcc dot gnu dot org]

I have built a 4.4.0 version of GCC and built newlib with that version and
installed it in say /MYPREFIX and then go and try to build 4.5.0.  I then build
GCC with the same /MYPREFIX but not a combined build, the testsuite is not able
to find the libc headers.

I don't know if this a regression because this is the first time I hit it and I
just happened to build 4.5 and was getting many failures this way.

An example of a failure is:
Executing on host: /home/apinski/src/local/gcc/objdir-spu/gcc/xgcc
-B/home/apinski/src/local/gcc/objdir-spu/gcc/   -O0  -w -c  -o 990625-1.o
/home/apinski/src/local/gcc/gcc/testsuite/gcc.c-torture/compile/990625-1.c   
(timeout = 300)
/home/apinski/src/local/gcc/gcc/testsuite/gcc.c-torture/compile/990625-1.c:2:
fatal error: string.h: No such file or directory^M
compilation terminated.^Mcompiler exited with status 1
output is:
/home/apinski/src/local/gcc/gcc/testsuite/gcc.c-torture/compile/990625-1.c:2:
fatal error: string.h: No such file or directory^Mcompilation terminated.^M

FAIL: gcc.c-torture/compile/990625-1.c  -O0  (test for excess errors)Excess
errors:


-- 
           Summary: Testsuite not finding libc headers with cross builds and
                    only previous version of GCC installed
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40002