关于在GNU /
Linux上启用ccache的文档很少.以下是
launchpad.net的回复：
At the moment,I think the best way to enable ccache is to add
“/usr/lib/ccache” to the front of your path. If you want to enable it
for all users by default,change the PATH variable in
/etc/environment.
有人可以给我更多关于启用ccache的信息吗？
解决方法
至少有两种方法：
i)覆盖Makefile中的CC,CXX,…标志.在R框架内,读取系统和可选的用户配置文件,我只需设置
VER=4.7 CC=ccache gcc-$(VER) CXX=ccache g++-$(VER) SHLIB_CXXLD=g++-$(VER) FC=ccache gfortran F77=ccache gfortran
这也允许我在gcc版本之间来回切换.现在所有涉及R的编译都使用ccache.
ii)对于其他用途,我已经部署了在/usr/bin之前检查/usr/local / bin /的事实.人们可以做到
root@max:/usr/local/bin# ls -l gcc lrwxrwxrwx 1 root root 15 Jan 27 11:04 gcc -> /usr/bin/ccache root@max:/usr/local/bin# ./gcc --version gcc (Ubuntu/Linaro 4.7.2-2ubuntu1) 4.7.2 Copyright (C) 2012 Free Software Foundation,Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. root@max:/usr/local/bin#
现在通过ccache调用gcc：
edd@max:/tmp$cp -vax ~/src/progs/C/benfordsLaw.c . `/home/edd/src/progs/C/benfordsLaw.c' -> `./benfordsLaw.c' edd@max:/tmp$time /usr/local/bin/gcc -c benfordsLaw.c real 0m0.292s user 0m0.052s sys 0m0.012s edd@max:/tmp$time /usr/local/bin/gcc -c benfordsLaw.c real 0m0.026s user 0m0.004s sys 0m0.000s edd@max:/tmp$
