Re: [Tinycc-devel] [PATCH] TCC arm64 back end

[Thomas Preud'homme]

Le dimanche 22 février 2015, 06:13:21 Michael Matz a écrit :
> Hi,
> 

> 
> And I pulled my hair out again when tracing the different paths the
> linker can go through in different modes, and how the relocs and symbol
> values change over the course of compilation.  One of those days ... :-)

I think that's the next thing I'm going to work on. And then maybe simplify 
the Makefile and configure machinery but that's less fun and easier to break in 
my experience. I already started looking at bind_exe_dynsyms and why it's 
needed. All I can say for now is that without it the linking fails on x86-64 
because of unresolved __libc_start_main. This is unsurprisingly provided by 
the libc.

From what I understand a symbol is considered unresolved if it cannot be found 
in the dynsym section of the output file and it seems only relocation handled 
in build_got_entries leads to a dynsym being created. However 
__libc_start_main has a R_X86_64_PC32 that doesn't lead to a got + plt so no 
entry created in dynsym.

I probably won't write any code tonight and it'll take time but we'll get 
things cleaned up eventually.

Best regards,

Thomas

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