My Summaries

Kinds of questions and answers that I encounter:

1、在Makefile文件中遇到一些变量，如CFLAGS、LDLIBS等，这些不是gcc命令的builtin变量，而是make命令的builtin变量，以CFLAGS为例，在使用make命令解析执行Makefile编译脚本时，make命令会将CFLAGS的值作为编译options/flags传递给gcc命令，从而影响编译结果。

CFLAGS、LDLIBS等builtin变量的解释可以查阅make官方文档make.pdf

For Instances：

CFLAGS：extra flags to give to the C compiler

LDLIBS：library flags or names given to compilers when they are supposed to invoke the linker "ld"

LDFLAGS：extra flags to give to compilers when they are supposed to invoke the linker "ld"

2、