Fix in-tree GCC builds after r304681.

There were a few issues.
- In-tree GCC won't have X_COMPILER_TYPE defined but will have
  WANT_COMPILER_TYPE==gcc set from the SYSTEM_COMPILER logic that can
  be used.  Make the clang check specific to clang as well to ensure
  -target doesn't leak into a GCC build.
- When using a cross-compiler GCC (with a default sysroot or arch) and also
  passing --sysroot, it basically forgets all internal paths for
  libraries.  We've already worked around this quite a bit for
  the external toolchains.  Now for the in-tree bootstrap cross-compiler
  GCC, also pass in the needed -B${WORLDTMP}/usr/lib to find the crt
  object files, but also -isystem and -L to fix the paths.  This creates
  quite a spammy build log, but it is clear and still achieves the goals
  and stays consistent between internal and external build flags.
  Reducing the spam by using the '=' prefix feature will help and be
  done later.

MFC after:	3 days
X-MFC-With:	r304681
Reported by:	bz
Pointyhat to:	bdrewery
Sponsored by:	EMC / Isilon Storage Division

1 files changed, 2 insertions, 1 deletions

diff --git a/Makefile.libcompat b/Makefile.libcompat
index 9fbfa075d338..987874b15489 100644
--- a/Makefile.libcompat
+++ b/Makefile.libcompat
@@ -73,7 +73,8 @@ LIBCOMPATCFLAGS+=	${LIBCOMPATCPUFLAGS} \
 # Clang/GCC.
 LIBCOMPATCFLAGS+=	-B${LIBCOMPATTMP}/usr/lib${libcompat}
 
-.if defined(X_COMPILER_TYPE) && ${X_COMPILER_TYPE} == gcc
+.if ${WANT_COMPILER_TYPE} == gcc || \
+    (defined(X_COMPILER_TYPE) && ${X_COMPILER_TYPE} == gcc)
 # GCC requires -isystem when using a cross-compiler and --sysroot.  Note that
 # Makefile.inc1 only applies this with an external compiler but libcompat
 # always does since even in-tree GCC 4.2 needs this to override the built-in