在QT5.12.1 ARM开发环境搭建 并 移植到RK3399 ubuntu16.04系统运行【完整版】_z54的博客-CSDN博客进行QT交叉编译安装ARM环境时出现了这个问题，主要提示错误如下：
Project ERROR: Cannot run compiler 'g++'. Maybe you forgot to setup the environment?
可以大概猜到是环境添加的问题，可是我已经添加过环境了啊：
#
# qmake configuration for building with aarch64-linux-gnu-g++
#
MAKEFILE_GENERATOR = UNIX
CONFIG += incremental
QMAKE_INCREMENTAL_STYLE = sublib
QT_QPA_DEFAULT_PLATFORM = linuxfb
QMAKE_CFLAGS_RELEASE += -O2 -march=armv8-a -lts
QMAKE_CXXFLAGS_RELEASE += -O2 -march=armv8-a -lts
include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
include(../common/g++-unix.conf)
# modifications to g++.conf
QMAKE_CC = aarch64-linux-gnu-gcc
QMAKE_CXX = aarch64-linux-gnu-g++
QMAKE_LINK = aarch64-linux-gnu-g++
QMAKE_LINK_SHLIB = aarch64-linux-gnu-g++
# modifications to linux.conf
QMAKE_AR = aarch64-linux-gnu-ar cqs
QMAKE_OBJCOPY = aarch64-linux-gnu-objcopy
QMAKE_NM = aarch64-linux-gnu-nm -P
QMAKE_STRIP = aarch64-linux-gnu-strip
load(qt_config)
后来打开了一个新终端，输入aa之后按两次Tab按键，输出我有的一些架构，发现我根本没有
aarch64-linux-gnu-gcc
aarch64-linux-gnu-g++
而我的是
aarch64-linux-gnu-gcc-5
aarch64-linux-gnu-g++-6
因此之后修改一下qtbase/mkspecs/linux-aarch64-gnu-g++/qmake.conf这个文件：
#
# qmake configuration for building with aarch64-linux-gnu-g++
#
MAKEFILE_GENERATOR = UNIX
CONFIG += incremental
QMAKE_INCREMENTAL_STYLE = sublib
QT_QPA_DEFAULT_PLATFORM = linuxfb
QMAKE_CFLAGS_RELEASE += -O2 -march=armv8-a -lts
QMAKE_CXXFLAGS_RELEASE += -O2 -march=armv8-a -lts
include(../common/linux.conf)
include(../common/gcc-base-unix.conf)
include(../common/g++-unix.conf)
# modifications to g++.conf
QMAKE_CC = aarch64-linux-gnu-gcc-5
QMAKE_CXX = aarch64-linux-gnu-g++-6
QMAKE_LINK = aarch64-linux-gnu-g++-6
QMAKE_LINK_SHLIB = aarch64-linux-gnu-g++-6
# modifications to linux.conf
QMAKE_AR = aarch64-linux-gnu-ar-5 cqs
QMAKE_OBJCOPY = aarch64-linux-gnu-objcopy
QMAKE_NM = aarch64-linux-gnu-nm -P
QMAKE_STRIP = aarch64-linux-gnu-strip
load(qt_config)
之后就qmake成功了。
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