Re: [Tinycc-devel] tinycc 0.9.25 x86_64 on Fedora 12

[Thomas Preud'homme]

Le mardi 03 août 2010 17:13:23, Aharon Robbins a écrit :
> Hi. I built tinycc on my x86_64 Fedora 12 system. Here's a report.
> 
> 1. Below is a patch that was necessary to get it to find the libraries;
>    something should be done with configuring etc. to handle this. My patch
>    is definitely quick and dirty.
> 
> 2. When built, my program could not find some of the string functions,
>    such as strlen, strcmp, strncmp and strcpy. I put in replacement
> versions, but that's not a scalable solution. Any idea what's not working?
Yes, since recent version of glibc, they are all indirect function symbols. 
According to man nm:
For ELF format files this indicates that the symbol is an indirect function.  
This is a GNU extension to the standard set of ELF symbol types.  It indicates 
a symbol which if referenced by a relocation does not evaluate to its address, 
but instead must be invoked at runtime.  The runtime execution will then 
return the value to be used in the relocation.

I started looking about this in binutils (which hold ld) but although there is 
not so much code, I couldn't find the relevant code (I'm not a specialist of 
linkers and compilers, I only know the basics). It should be just a few line 
but what I found was about creating space in some ELF section.

> 
> 3. I have a static table with some function pointers to static functions.
>    This compiles, but the table values are NULL. Any idea why?
Nope, sorry. Are the functions and the table local or extern ?
> 
> 4. The external variable `char **environ' was accessable, but initialized
>    to NULL. I had to use the (really old style) three argument version of
>    main to get access to the environment and then initalize environ from
>    within main.  Any idea why?
Yes, and there is a patch in the mob branch. Try to apply this commit 
http://repo.or.cz/w/tinycc.git/commitdiff/a28b18fa16edaeb6bc7d34cf1ddac690b27ba610?hp=036ff17916586febc968b964ee416e1d4d1da70f
> 
> I am overall quite impressed; the compiler is blazingly fast, which is
> quite refreshing when one normally uses GCC.
> 
> Thanks,
> --
> Aharon (Arnold) Robbins                               arnold AT skeeve DOT com
> P.O. Box 354          Home Phone: +972  8 979-0381
> Nof Ayalon            Cell Phone: +972 50  729-7545
> D.N. Shimshon 99785   In the afterlife, all the computers run Linux. You 
get
> ISRAEL                        to decide if you're in Heaven or Hell.  -- A. 
> Robbins
> ------------------------------------------------------------------------
> diff -u tcc-0.9.25/libtcc.c tcc-0.9.25.adr/libtcc.c
> --- tcc-0.9.25/libtcc.c       2009-05-18 17:27:06.000000000 +0300
> +++ tcc-0.9.25.adr/libtcc.c   2010-07-20 17:22:10.000000000 +0300
> @@ -1824,8 +1824,8 @@
>  #ifndef TCC_TARGET_PE
>      /* default library paths */
>      tcc_add_library_path(s, CONFIG_SYSROOT "/usr/local/lib");
> -    tcc_add_library_path(s, CONFIG_SYSROOT "/usr/lib");
> -    tcc_add_library_path(s, CONFIG_SYSROOT "/lib");
> +    tcc_add_library_path(s, CONFIG_SYSROOT "/usr/lib64");
> +    tcc_add_library_path(s, CONFIG_SYSROOT "/lib64");
>  #endif
> 
>      /* no section zero */
> diff -u tcc-0.9.25/tcc.h tcc-0.9.25.adr/tcc.h
> --- tcc-0.9.25/tcc.h  2009-05-18 17:27:06.000000000 +0300
> +++ tcc-0.9.25.adr/tcc.h      2010-07-20 17:14:49.000000000 +0300
> @@ -126,7 +126,7 @@
> 
>  /* path to find crt1.o, crti.o and crtn.o. Only needed when generating
>     executables or dlls */
> -#define CONFIG_TCC_CRT_PREFIX CONFIG_SYSROOT "/usr/lib"
> +#define CONFIG_TCC_CRT_PREFIX CONFIG_SYSROOT "/usr/lib64"
> 
>  #define INCLUDE_STACK_SIZE  32
>  #define IFDEF_STACK_SIZE    64
> diff -u tcc-0.9.25/tccelf.c tcc-0.9.25.adr/tccelf.c
> --- tcc-0.9.25/tccelf.c       2009-05-18 17:27:06.000000000 +0300
> +++ tcc-0.9.25.adr/tccelf.c   2010-07-20 17:20:51.000000000 +0300
> @@ -1199,7 +1199,7 @@
>          tcc_add_library(s1, "c");
> 
>  #ifdef CONFIG_USE_LIBGCC
> -        tcc_add_file(s1, CONFIG_SYSROOT "/lib/libgcc_s.so.1");
> +        tcc_add_file(s1, CONFIG_SYSROOT "/lib64/libgcc_s.so.1");
>  #else
>          snprintf(buf, sizeof(buf), "%s/%s", s1->tcc_lib_path,
> "libtcc1.a"); tcc_add_file(s1, buf);
> @@ -1277,7 +1277,7 @@
>  #elif defined TCC_ARM_EABI
>  static char elf_interp[] = "/lib/ld-linux.so.3";
>  #elif defined(TCC_TARGET_X86_64)
> -static char elf_interp[] = "/lib/ld-linux-x86-64.so.2";
> +static char elf_interp[] = "/lib64/ld-linux-x86-64.so.2";
>  #elif defined(TCC_UCLIBC)
>  static char elf_interp[] = "/lib/ld-uClibc.so.0";
>  #else
> 
> 
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