gcc how find -lglfw packages? - c++

Question

when cpp code Linking on vscode
must define json file like below.
{
"version": "2.0.0",
"tasks": [
{
"type": "cppbuild",
"label": "C/C++: g++ 활성 파일 빌드",
"command": "/usr/bin/g++",
"args": [
"-g",
"glad.c",
"-pthread",
"-o",
"main",
"main.cpp",
"-lglfw",
"-lGLU",
"-lGL",
"-lXrandr",
"-lXxf86vm",
"-lXinerama",
"-lX11",
"-lrt",
"-ldl",
],
"options": {
"cwd": "${workspaceFolder}"
},
"problemMatcher": [
"$gcc"
],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "컴파일러: /usr/bin/g++"
}
]
}
my question is
how gcc compiler detect args parameter.
Words like -g...
Because the compiler pre-specifies words, it looks for words and pre-specifies what to do.
The -lXrandr word is the name of the package you have installed.
When this name was found,
What does the compiler do?
Does the compiler search for pre-specified folders and check for packages?
I want to know how the cpp compiler connects files on the Linux system. Do you have any links to help with this knowledge?

Answer 1

how gcc compiler detect args parameter.
Gcc is a very old project with a lot of options. It has it's own command line options handling library.
The -lXrandr word is the name of the package you have installed
No, it's not the name of package. It's the name of the library.
What does the compiler do?
Compiler searches for a library name libXrandr.so. In short, the file is searched in multiple directories, the standard library paths are searched and gcc installation path and additionally paths given with -L parameter and paths with LIBRARY_PATH environment variable. See also man ld.so and man ldconfig.
Does the compiler search for pre-specified folders
Yes.
and check for packages?
No, a "package" is something else. Gcc is a compiler, it does not deal with "packages".
how the cpp [*gcc] compiler connects files on the Linux system
"How" is a broad question and gcc is a very complicated program. It opens the files, parses them properly, finds symbols, resolves references, generates final executable.
Do you have any links to help with this knowledge?
Gcc has extensive documentation and it's open source.