Re: [Tinycc-devel] tcc 0.9.26 cannot build mob on x86 _64 linux (regression)

[Thomas Preudhomme]

Le 2014-03-20 04:28, Austin English a écrit :
> Yes, that works, thanks. Ive been working on a test using tcc to try
> compiling all packages on my gentoo system (after testing with
> gcc/clang). tcc has been recompiling/reinstalled a few times in that
> process, which lead to the breakage.

I wouldn't exactly call it a breakage. It's a bootstrapping issue. On 
ARM systems the data cache is not coherent with the instruction cache so 
that tcc -run was not working correctly: the code is generated in data 
cache and then executed from the instruction cache which can still 
contain the old content of that memory area. The solution is to ask for 
the coherence explicitly. GCC propose the intrinsic __clear_cache for 
asking this and so we started to use it in tcc. Shortly after we added 
__clear_cache to libtcc1 so that tcc can compile itself. Of course that 
only works if you compile tcc with a tcc compiled after that commit, 
since otherwise you would have a tcc without __clear_cache which is now 
needed to compile tcc.

Best regards,

Thomas