[Bug bootstrap/28615] New: cross-compile uses host cpp to determine features

[freyther at inf dot fu-berlin dot de]

When creating a cross-compiler the target-* bits determine features by
executing the host CPP binary with host CPPFLAGS. In the case of  OSX/Darwin
this lead to the believe of having a sys/filio.h available and
miscompiled/broken libstdc++.

A fix would be to use xgcc -E instead of /usr/bin/cpp and emptying CPPFLAGS
when configuring target-* (CONFIGURE_ALL_TARGETS)


-- 
           Summary: cross-compile uses host cpp to determine features
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: freyther at inf dot fu-berlin dot de
  GCC host triplet: i386-darwin
GCC target triplet: arm-unknown-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28615