关于在 GNU/Linux 上启用
ccache目前，我认为启用ccache的最好方法是添加 将“/usr/lib/ccache”添加到路径的前面。如果您想启用它 默认情况下，对于所有用户，更改 PATH 变量 /etc/环境。
有人可以给我更多有关启用
ccache下载后，请按照以下步骤操作：
A) 使用以下命令压缩文件：
$tar -xvf ccache-3.2.4.tar.bz2
Note : I'm using ccache 3.2.4 Version.You can download the latest one.
B) 进入 ccache-3.2.4 文件夹并运行以下命令：
$./configure
$./make
$ sudo make install
C) 转到您的 .bashrc 并插入以下内容：
export CCACHE_DIR=/home/user_name/.ccache
export CCACHE_TEMPDIR=/home/user_name/.ccache
Note : Fill user_name with your User Name
D）保存您的 Bashrc 并获取它
$ source ~/.bashrc
E) 要检查 ccache 是否正常工作，请键入：
ccache -M 10G : To Set the ccache Size to 10GB
F) 要检查 ccache 是否正常工作，请键入：
ccache -s : To check ccache statistics
至少有两种方法：
i) 覆盖 Makefile 中的
CCCXXVER=4.7
CC=ccache gcc-$(VER)
CXX=ccache g++-$(VER)
SHLIB_CXXLD=g++-$(VER)
FC=ccache gfortran
F77=ccache gfortran
这也允许我在
gccccacheii) 对于其他用途，我已经部署了在
/usr/local/bin//usr/binroot@max:/usr/local/bin# ls -l gcc
lrwxrwxrwx 1 root root 15 Jan 27 11:04 gcc -> /usr/bin/ccache
root@max:/usr/local/bin# ./gcc --version
gcc (Ubuntu/Linaro 4.7.2-2ubuntu1) 4.7.2
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
root@max:/usr/local/bin#
现在通过
gccccacheedd@max:/tmp$ 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$
另一种可能性（而不是Keltar评论的
export CC=ccache$HOME/bin/$PATH/usr/bin/ ln -s /usr/bin/ccache $HOME/bin/gcc
然后 gcc 的每个
execvp(3)都会找到该符号链接
$ which ccache
/usr/bin/ccache
# ccache
export USE_CCACHE=1
export CCACHE_SLOPPINESS=file_macro,include_file_mtime,time_macros
export CCACHE_UMASK=002
源“~/.bashrc”或“~/.zshrc” 4. ccache默认设置的5GB磁盘空间通常就足够了。如果担心的话可以加大，ccache -M 30G 5.通过版本确认安装成功
$ ccache --version
ccache version 3.4.1
Copyright (C) 2002-2007 Andrew Tridgell
Copyright (C) 2009-2018 Joel Rosdahl
cache directory /home/username/.ccache
primary config /home/username/.ccache/ccache.conf
secondary config (readonly) /etc/ccache.conf
stats zero time Fri Jul 22 16:15:40 2022
cache hit (direct) 4186
cache hit (preprocessed) 875
cache miss 1069
cache hit rate 82.56 %
called for link 653
cleanups performed 0
files in cache 3209
cache size 159.3 MB
max cache size 30.0 GB
$ git clone https://github.com/zeromq/libzmq.git
Cloning into 'libzmq'...
remote: Enumerating objects: 43791, done.
remote: Counting objects: 100% (36/36), done.
remote: Compressing objects: 100% (28/28), done.
remote: Total 43791 (delta 11), reused 24 (delta 8), pack-reused 43755
Receiving objects: 100% (43791/43791), 21.91 MiB | 1.03 MiB/s, done.
Resolving deltas: 100% (31951/31951), done.
──────┬───────────────────────────────────────────────────────────────────────────────────────
│ File: CMakeLists.txt
───────┼──────────────────────────────────────────────────────────────────────────────────────
1 │ # CMake build script for ZeroMQ
2 │ project(ZeroMQ)
3 │
4 │ if(${CMAKE_SYSTEM_NAME} STREQUAL Darwin)
5 │ cmake_minimum_required(VERSION 3.0.2)
6 │ else()
7 │ cmake_minimum_required(VERSION 2.8.12)
8 │ endif()
9 │
10 + │ find_program(CCACHE_FOUND ccache)
11 + │ if(CCACHE_FOUND)
12 + │ set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
13 + │ set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
14 + │ message(STATUS "use ccache")
15 + │ endif(CCACHE_FOUND)
16 + │
17 │ include(CheckIncludeFiles)
$ cmake ..
-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- use ccache
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
...
/usr/bin/time make -j3
result:
48.79user 14.25system 0:21.60elapsed 291%CPU (0avgtext+0avgdata 176036maxresident)k
0inputs+282248outputs (0major+2406923minor)pagefaults 0swaps
/usr/bin/time make -j3
result:
2.78user 2.42system 0:02.15elapsed 241%CPU (0avgtext+0avgdata 23736maxresident)k
0inputs+21744outputs (0major+232849minor)pagefaults 0swaps