To me big surprise, I tried to compile my program after changing the "/bin/cc" link from "gcc" to "tcc" and I got an error saying: tcc: error: unsupported linker option '--gc-sections'.

I haven't noticed that D needs a C compiler before. Why is that and why the TinyC compiler (tcc) cannot be used and more importantly, can we fix that?

On Tuesday, 3 August 2021 at 12:59:49 UTC, rempas wrote:

By default, the D compiler uses cc to invoke the linker. You can override this by setting the environment variable CC (on Posix) [1] or LINKCMD64 (on Windows) [2].

Alternatively, you can compiler your D modules separately with dmd -c and then invoke the linker directly to build the final executable (or have your build system do this).

[1] https://dlang.org/dmd-linux.html#environment
[2] https://dlang.org/dmd-windows.html#environment

On Tuesday, 3 August 2021 at 13:54:25 UTC, Paul Backus wrote:

Thanks for the info! Alright, I'm exporting the "CC" env variable to "tcc" and still it will give me the error. I also tried to set it to a linker (bot ld and lld) and I'm getting the following errors:

ld.lld: error: unknown argument '-fuse-ld=ld'
ld.lld: error: unknown argument '-Wl,--gc-sections'
ld.lld: error: unknown emulation: 64
ld.lld: error: unable to find library -lrt
ld.lld: error: unable to find library -ldl
ld.lld: error: unable to find library -lpthread
ld.lld: error: unable to find library -lm
Error: /bin/ld.lld failed with status: 1

I used the "--help" option with ldc and it seems that there is an option to set the linker ("--linker"), to pass options to the linker ("-L") and an option to set the C compiler ("--gcc"). I'm setting it up with the following command: ./bin/ldc2 test.d --link-internally --linker=ld.lld -L="-L=/usr/lib64" -L"-lc". However I'm still getting the HUGE following error message:

lld: error: undefined symbol: _Unwind_Resume
>>> referenced by curl.d
>>>               curl.o:(_D4core8internal8lifetime__T10emplaceRefTS3std11concurrency__T4ListTSQBbQBa7MessageZQw4NodeTQBzTQBcZQCuFKQCmKQBpZv) in archive /usr/lib64/libphobos2-ldc.a
>>> referenced by object.d
>>>               object.o:(_D6object9Throwable8toStringMxFMDFIAaZvZv) in archive /usr/lib64/libdruntime-ldc.a
>>> referenced by osthread.d
>>>               osthread.o:(_D4core6thread8osthread6Thread5startMFNbZCQBoQBmQBiQBc) in archive /usr/lib64/libdruntime-ldc.a
>>> referenced 108 more times

lld: error: undefined symbol: _Unwind_DeleteException
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_eh_enter_catch) in archive /usr/lib64/libdruntime-ldc.a
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_eh_personality_common) in archive /usr/lib64/libdruntime-ldc.a
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_eh_personality_common) in archive /usr/lib64/libdruntime-ldc.a

lld: error: undefined symbol: _Unwind_RaiseException
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_throw_exception) in archive /usr/lib64/libdruntime-ldc.a

lld: error: undefined symbol: _Unwind_GetLanguageSpecificData
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_eh_personality_common) in archive /usr/lib64/libdruntime-ldc.a

lld: error: undefined symbol: _Unwind_GetRegionStart
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_eh_personality_common) in archive /usr/lib64/libdruntime-ldc.a

lld: error: undefined symbol: _Unwind_GetIPInfo
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_eh_personality_common) in archive /usr/lib64/libdruntime-ldc.a

lld: error: undefined symbol: _Unwind_SetGR
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_eh_personality_common) in archive /usr/lib64/libdruntime-ldc.a
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_eh_personality_common) in archive /usr/lib64/libdruntime-ldc.a

lld: error: undefined symbol: _Unwind_SetIP
>>> referenced by dwarfeh.d
>>>               dwarfeh.o:(_d_eh_personality_common) in archive /usr/lib64/libdruntime-ldc.a
Error: linking with LLD failed

If I don't link the "libc", I will only get the error about the "_Unwind_Resume" symbol but I will get other for "printf", "free" etc. So yeah can anyone help?