autotools和cmake

Makefile

https://muicoder.github.io/linux_basic/0520source_code_and_tarball.html

errno

打印错误信息

#include <errno.h>
#include <string.h>
printf("[error]read error: %s", strerror(errno));

 

 

Tutorial of gcc and gdb

https://cseweb.ucsd.edu/classes/fa09/cse141/tutorial_gcc_gdb.html

常见方法

nm -D xxx.so
##查看xxx.so有哪些方法

make distclean #clean掉configure生成的文件
make clean     #clean掉make生成的文件
make uninstall #clean掉install到/usr或/usr/local的文件

 

 

PKG_CONFIG_PATH

https://www.cnblogs.com/cnland/archive/2013/02/08/2909273.html

cmake

https://www.baeldung.com/linux/cmake-cmake_install_prefix

cmake -DCMAKE_INSTALL_PREFIX=/path/to/subdir

auto tools

• The Autotools are tools that will create a GNU Build System for your package. Autoconf mostly focuses on configure and Automake on Makefiles.

• Note that running autoreconf is only needed initially when the GNU Build System does not exist. When you later change some instructions in a Makefile.am or configure.ac, the relevant part of the build system will be regenerated automatically when you execute make.
• autoreconf is a script that calls autoconf, automake, and a bunch of other commands in the right order. If you are beginning with these tools, it is not important to figure out in which order all of these tools should be invoked and why. However, because Autoconf and Automake have separate manuals, the important point to understand is that autoconf is in charge of creating configure from configure.ac, while automake is in charge of creating Makefile.ins from Makefile.ams and configure.ac. This should at least direct you to the right manual when seeking answers.

• Autotools Tutorial
• A Small Hello World
• autoconf manual

• Standard Makefile Targets

configure.ac中部分instruction解释

• The argument to AM_INIT_AUTOMAKE is a list of options for automake

 

Linux /usr/bin与/usr/local/bin使用区别

• 首先注意usr 指 Unix System Resource，而不是User
• /usr/bin下面的都是系统预装的可执行程序，会随着系统升级而改变。
• /usr/local/bin目录是给用户放置自己的可执行程序的地方，推荐放在这里，不会被系统升级而覆盖同名文件。

 

GCC用法

gcc -I/usr/local/include -L/usr/local/lib -lmylib -o hello

• -I 指定include目录   （注意是i的大写）
• -L 指定lib目录
• -l 指定link库名     （L的小写）

 常见问题

当编译时，出现undefined reference to timer_create的报错，可能过在configure的时个加上lrt ,比如

./configure --prefix=/usr/local --with-init-dir=/etc/init.d CFLAGS=-lrt -L/root/usr/lib64 -I/root/usr/include

或者
export CFLAGS="-L/root -L/root"

加上编译选项，让它link到对应库

其他引用

gcc创建静态库和动态库

https://www.chungkwong.cc/makefile.html

https://www.cnblogs.com/ishen/p/11993957.html