在Linux的Qt交叉编译时，经常出现arm-linux-g++或gcc命令不存在

当arm-linux-g++或者arm-linux-gcc不能用时，只需要把qmake执行文件中定义的编译器名称改成电脑中已安装的版本，下面是我安装的版本，仅供参考。
首先 找到我的安装目录 我的路径是usr/local/arm/qt4.8.5/mkspecs/qws/linux-arm-g++/qmake.conf
然后用vim打开 修改里边的参数。如下：

详细步骤如下：

abc123@ubuntu:~$ sudo su
[sudo] password for abc123: 
root@ubuntu:/home/abc123# cd
root@ubuntu:~# cd /usr/local
root@ubuntu:/usr/local# ls
arm  bin  etc  games  include  lib  man  sbin  share  src
root@ubuntu:/usr/local# cd arm
root@ubuntu:/usr/local/arm# ls
cross  cross-tools-am335x-4.5.3.tar.bz2  qt4.8.5  qt4.8.5-sdk.tar.bz  tslib
root@ubuntu:/usr/local/arm# cd qt4.8.5
root@ubuntu:/usr/local/arm/qt4.8.5# ls
bin    examples  include  mkspecs  tests
demos  imports   lib      plugins  translations
root@ubuntu:/usr/local/arm/qt4.8.5# cd mkspecs
root@ubuntu:/usr/local/arm/qt4.8.5/mkspecs# ls
aix-g++                          qconfig.pri
aix-g++-64                       qdevice.pri
aix-xlc                          qnx-armv7le-qcc
aix-xlc-64                       qnx-x86-qcc
blackberry-armv7le-qcc           qws
blackberry-playbook-armv7le-qcc  sco-cc
blackberry-playbook-x86-qcc      sco-g++
blackberry-x86-qcc               solaris-cc
common                           solaris-cc-64
cygwin-g++                       solaris-cc-64-stlport
darwin-g++                       solaris-cc-stlport
default                          solaris-g++
features                         solaris-g++-64
freebsd-g++                      symbian-abld
freebsd-g++46                    symbian-armcc
freebsd-icc                      symbian-gcce
hpux-acc                         symbian-sbsv2
hpux-acc-64                      tru64-cxx
hpux-acc-o64                     tru64-g++
hpux-g++                         unixware-cc
hpux-g++-64                      unixware-g++
hpuxi-acc-32                     unsupported
hpuxi-acc-64                     win32-borland
hpuxi-g++-64                     win32-g++
hurd-g++                         win32-g++-4.6
irix-cc                          win32-icc
irix-cc-64                       win32-msvc2003
irix-g++                         win32-msvc2005
irix-g++-64                      win32-msvc2008
linux-arm-gnueabi-g++            win32-msvc2010
linux-cxx                        win32-msvc2012
linux-ecc-64                     wince50standard-armv4i-msvc2005
linux-g++                        wince50standard-armv4i-msvc2008
linux-g++-32                     wince50standard-mipsii-msvc2005
linux-g++-64                     wince50standard-mipsii-msvc2008
linux-g++-maemo                  wince50standard-mipsiv-msvc2005
linux-icc                        wince50standard-mipsiv-msvc2008
linux-icc-32                     wince50standard-sh4-msvc2005
linux-icc-64                     wince50standard-sh4-msvc2008
linux-kcc                        wince50standard-x86-msvc2005
linux-llvm                       wince50standard-x86-msvc2008
linux-lsb-g++                    wince60standard-armv4i-msvc2005
linux-pgcc                       wince60standard-x86-msvc2005
lynxos-g++                       wince70embedded-armv4i-msvc2008
macx-g++                         wince70embedded-x86-msvc2008
macx-g++40                       wincewm50pocket-msvc2005
macx-g++42                       wincewm50pocket-msvc2008
macx-icc                         wincewm50smart-msvc2005
macx-llvm                        wincewm50smart-msvc2008
macx-pbuilder                    wincewm60professional-msvc2005
macx-xcode                       wincewm60professional-msvc2008
macx-xlc                         wincewm60standard-msvc2005
modules                          wincewm60standard-msvc2008
netbsd-g++                       wincewm65professional-msvc2005
openbsd-g++                      wincewm65professional-msvc2008
root@ubuntu:/usr/local/arm/qt4.8.5/mkspecs# cd qws
root@ubuntu:/usr/local/arm/qt4.8.5/mkspecs/qws# ls
freebsd-generic-g++    linux-generic-g++     linux-x86-g++
integrity-arm-cxarm    linux-generic-g++-32  linux-zylonite-g++
integrity-ppc-cxppc    linux-ipaq-g++        macx-generic-g++
integrity-x86-cx86     linux-lsb-g++         macx-nacl-g++
linux-arm-g++          linux-mips-g++        qnx-arm-g++
linux-arm-gnueabi-g++  linux-nacl-g++        qnx-armv7-g++
linux-armv6-g++        linux-powerpc-g++     qnx-generic-g++
linux-avr32-g++        linux-sh4al-g++       qnx-i386-g++
linux-cellon-g++       linux-sharp-g++       qnx-ppc-g++
linux-dm7000-g++       linux-sh-g++          solaris-generic-g++
linux-dm800-g++        linux-x86_64-g++
root@ubuntu:/usr/local/arm/qt4.8.5/mkspecs/qws# cd linux-arm-g++
root@ubuntu:/usr/local/arm/qt4.8.5/mkspecs/qws/linux-arm-g++# ls
qmake.conf  qmake.conf~  qplatformdefs.h
root@ubuntu:/usr/local/arm/qt4.8.5/mkspecs/qws/linux-arm-g++# vim qmake.confg
root@ubuntu:/usr/local/arm/qt4.8.5/mkspecs/qws/linux-arm-g++# vim qmake.conf
root@ubuntu:/usr/local/arm/qt4.8.5/mkspecs/qws/linux-arm-g++# 

这样就OK了