Error decomposing gcc command into separate compile and link steps - c++

Question

I am getting a linker error building a simple project using scons. The example commands show integrated compiling and linking of program binaries, which scons does not do (though I probably could force it to, I'd rather not if possible).
This command works fine:
gcc -o main.exe main.cpp C:\raylib\raylib\src\raylib.rc.data -s -static -Os -IC:\raylib\raylib\src -DPLATFORM_DESKTOP -lraylib -lopengl32 -lgdi32 -lwinmm
Whereas these two fail:
g++ -o main.o -c -DPLATFORM_DESKTOP -Os -static -IC:\raylib\raylib\src main.cpp
ld -o mains.exe c:\raylib\raylib\src\raylib.rc.data -s -static main.o -LC:\raylib\raylib\src -lraylib -lopengl32 -lgdi32 -lwinmm
Resulting in:
c:\raylib\w64devkit\bin\ld: cannot find -lopengl32
c:\raylib\w64devkit\bin\ld: cannot find -lgdi32
c:\raylib\w64devkit\bin\ld: cannot find -lwinmm
Any insights? I'm not particularly familiar with the .rc.data files.

Answer 1

I would try to get gcc's library search path:
]$ gcc -x cpp-output -E -v /dev/null 2>&1 | grep LIBRARY_PATH | sed 's/:/\n/g'
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/11/
/usr/lib/gcc/x86_64-linux-gnu/11/../../../x86_64-linux-gnu/
/usr/lib/gcc/x86_64-linux-gnu/11/../../../../lib/
/lib/x86_64-linux-gnu/
/lib/../lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/../lib/
/usr/lib/gcc/x86_64-linux-gnu/11/../../../
/lib/
/usr/lib/
see if the missing libraries are in any of those directories, and if they are then add them to the ld invocation as -L<path> option.
EDIT
To see ld search path when it is called on its own, I think this should work:
]$ ld --verbose | grep SEARCH_DIR | sed 's/;/\n/g'
SEARCH_DIR("=/usr/local/lib/x86_64-linux-gnu")
SEARCH_DIR("=/lib/x86_64-linux-gnu")
SEARCH_DIR("=/usr/lib/x86_64-linux-gnu")
SEARCH_DIR("=/usr/lib/x86_64-linux-gnu64")
SEARCH_DIR("=/usr/local/lib64")
SEARCH_DIR("=/lib64")
SEARCH_DIR("=/usr/lib64")
SEARCH_DIR("=/usr/local/lib")
SEARCH_DIR("=/lib")
SEARCH_DIR("=/usr/lib")
SEARCH_DIR("=/usr/x86_64-linux-gnu/lib64")
SEARCH_DIR("=/usr/x86_64-linux-gnu/lib")
When you eliminate duplicates you'll notice that /usr/lib/gcc/x86_64-linux-gnu/11/ is an additional directory that is being searched when linking with gcc (your first command) but not when linking directly with ld.
But that's on my machine. On yours it will probably be a bit different.