bin/55411: can't configure on crossplatform gcc host-libcpp

[hayashi%totalware.gifu.gifu.jp@localhost]

>Number:         55411
>Category:       bin
>Synopsis:       can't configure on crossplatform gcc host-libcpp
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Jun 24 04:40:00 +0000 2020
>Originator:     Akihiko HAYASHI
>Release:        current
>Organization:
>Environment:
FreeBSD jail1.totalware.gifu.gifu.jp 11.4-STABLE FreeBSD 11.4-STABLE #41 r361988: Wed Jun 10 15:59:38 JST 2020     root%deneb.totalware.gifu.gifu.jp@localhost:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
This issue is on a NetBSD cross build on FreeBSD
My build environment is FreeBSD. FreeBSD has clang and mine is installed some ports/lang/gcc*

it fails to confiure at src/external/gpl3/gcc/usr.bin/host-libcpp/Makefile
I have set environment vars. HOST_CC, HOST_CXX but configure's CC or CXX is not set according to configure.log.

>How-To-Repeat:

>Fix:
problem is
src/external/gpl3/gcc/usr.bin/host-libcpp/Makefile

This make script will pass the environment variables (BUILD_ENV) to configure, but it does not pass because there is "&&"  before it.

plese modify
cd libcpp && ${BUILD_ENV} && \
to
cd libcpp && ${BUILD_ENV} \