OSDev.org

Posted: **Thu Nov 10, 2022 5:20 am**

Hey! I'm trying to bind a library to a program, but clang insistently does not see it or doesn't recognize it.

Can someone give me a hint?

clang-14: warning: -lfont: 'linker' input unused [-Wunused-command-line-argument]
clang-14: warning: argument unused during compilation: '-L.' [-Wunused-command-line-argument]
ld: main.o: in function `entry':
main.c:(.text+0x6): undefined reference to `font_char_length'

font.h

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extern uint8_t font_char_length( uint8_t character );

font.c

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#include	"stdint.h"
#include	"stddef.h"

uint8_t font_char_length( uint8_t character ) {
	return character + 1;
}

main.c

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#include	"stdint.h"
#include	"stddef.h"

#include	"font.h"

void entry() {
	uint8_t length = font_char_length( 0x30 );
}

make.sh

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CFLAGS="-Ofast -march=x86-64 -nostdlib -fomit-frame-pointer -fno-builtin -fno-stack-protector -m64 -mno-red-zone -fno-asynchronous-unwind-tables"
LDFLAGS="-nostdlib -zmax-page-size=0x1000 -static -no-dynamic-linker"

clang -c -fpic font.c ${CFLAGS}
clang -shared -o libfont.so font.o ${CFLAGS}

clang -L. -c main.c -o main.o -lfont ${CFLAGS}
ld main.o -o main -T linker.software ${LDFLAGS}

Posted: **Thu Nov 10, 2022 9:35 am**

You are giving linker command line flags to the compiler. That will not work. Try removing the -L and -l options from the second-to-last line and adding them to the last line of make.sh.

Posted: **Thu Nov 10, 2022 11:19 am**

nullplan wrote:You are giving linker command line flags to the compiler. That will not work. Try removing the -L and -l options from the second-to-last line and adding them to the last line of make.sh.

It worked! Thank you

My mistake was that I saw an example from GCC and the linker was built-in there.

Posted: **Thu Nov 10, 2022 11:32 am**

The linker is built into Clang too. The "-c" option tells Clang (or GCC) that you don't want it to link anything.

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