Static linking vs Dynamic linking in linux

Help
1

I have setup a very simple project. the directory structure is as below

experiment
    demo
        main.odin
    libsb 
        root.odin

the content is:
main.odin:

package demo
import "core:fmt"

foreign import sb "../libsb.o"
foreign sb {
	Add :: proc(a: int, b: int) -> int ---
}


main :: proc() {
	fmt.println(Add(1, 2))
}

root.odin:

package libsb

@(export)
Add :: proc(a: int, b: int) -> int {
	return a + b
}

Im building the libsb as object file as the static mode doesnt work on linux…

odin build libsb -build-mode=obj  -show-system-calls

then building the executable…

odin build demo -out:exp.out -show-system-calls

its giving me error as follows:

clang -Wno-unused-command-line-argument "/home/biswas08433/dev/odin/experiments/exp.o"  -o "/home/biswas08433/dev/odin/experiments/exp.out"  -lm -lc   -L/ -l:"/home/biswas08433/dev/odin/experiments/libsb.o"        -no-pie -Wl,-rpath,\$ORIGIN

/usr/bin/ld: ///home/biswas08433/dev/odin/experiments/libsb.o: in function `__$startup_runtime':
odin_package:(.text+0x0): multiple definition of `__$startup_runtime'; /home/biswas08433/dev/odin/experiments/exp.o:odin_package:(.text+0x0): first defined here
/usr/bin/ld: ///home/biswas08433/dev/odin/experiments/libsb.o: in function `__$cleanup_runtime':
odin_package:(.text+0x10): multiple definition of `__$cleanup_runtime'; /home/biswas08433/dev/odin/experiments/exp.o:odin_package:(.text+0x370): first defined here
/usr/bin/ld: ///home/biswas08433/dev/odin/experiments/libsb.o: in function `main':
odin_package:(.text+0xce0): multiple definition of `main'; /home/biswas08433/dev/odin/experiments/exp.o:odin_package:(.text+0x3bb0): first defined here
/usr/bin/ld: ///home/biswas08433/dev/odin/experiments/libsb.o: in function `__truncsfhf2':
odin_package:(.text+0x2220): multiple definition of `__truncsfhf2'; /home/biswas08433/dev/odin/experiments/exp.o:odin_package:(.text+0x1b460): first defined here
/usr/bin/ld: ///home/biswas08433/dev/odin/experiments/libsb.o: in function `__truncdfhf2':
odin_package:(.text+0x2450): multiple definition of `__truncdfhf2'; /home/biswas08433/dev/odin/experiments/exp.o:odin_package:(.text+0x1bc10): first defined here
/usr/bin/ld: ///home/biswas08433/dev/odin/experiments/libsb.o: in function `__gnu_h2f_ieee':
odin_package:(.text+0x2470): multiple definition of `__gnu_h2f_ieee'; /home/biswas08433/dev/odin/experiments/exp.o:odin_package:(.text+0x1bd50): first defined here
/usr/bin/ld: ///home/biswas08433/dev/odin/experiments/libsb.o: in function `__gnu_f2h_ieee':
odin_package:(.text+0x2540): multiple definition of `__gnu_f2h_ieee'; /home/biswas08433/dev/odin/experiments/exp.o:odin_package:(.text+0x1c430): first defined here
/usr/bin/ld: ///home/biswas08433/dev/odin/experiments/libsb.o: in function `__extendhfsf2':
odin_package:(.text+0x2560): multiple definition of `__extendhfsf2'; /home/biswas08433/dev/odin/experiments/exp.o:odin_package:(.text+0x1c450): first defined here
clang: error: linker command failed with exit code 1 (use -v to see invocation)

In the same way the dynamic linking works fine. Any help?

1 Like
2

I have had this same problem before. When I first started using Odin I played around with the foreign import system for a time. I was able to link against objects compiled in C just fine, but with Odin it redefines all these symbols like you’re showing.

I have found no flags that fix this issue, at least not ones displayed in odin build -help, so I don’t really know if there’s a way to fix it.

I didn’t think of it at the time, as I had just started using Odin, but it’s probably worth filing an issue. I can’t see any other mentions of this in the issues on the Github.

3

Also worth mentioning that foreign procedure declarations have the “cdecl” calling convention by default, so you should probably pop a @(default_calling_convention="odin") at the top of your foreign block if you’re importing odin code, unless something else is more useful.