ELLCC is based on clang/LLVM of course. Previously I mentioned that I was experimenting with YAML based config files for the compiler driver. When I made that post and subsequently, several people had objections to the approach because it potentially required reading a file each time the compiler is involked and that it would make the already complicated driver code even more complicated. It came up again today in the LLVM mailing list and it got me to thinking that maybe another real world example might help.

I used MinGW to cross compile ELLCC for Windows hosts. I started to wonder what an ELLCC config file might look like for using clang to cross compile for Windows instead. I came up with this as a first cut example:

# based_on `i386-ellcc-linux'
# based_on `ellcc-linux'
---
based_on:        ''
global:          
  static_default:  true
compiler:        
  options:         
    - -target i386-ellcc-win32
    # - -no-integrated-as
  c_include_dirs:  
    - /usr/lib64/gcc/i686-w64-mingw32/4.8.4/include
    - /usr/lib64/gcc/i686-w64-mingw32/4.8.4/include-fixed
    - /usr/i686-w64-mingw32/sys-root/mingw/include
  cxx_include_dirs: 
    - '$R/include/c++'
assembler:       
  exe: '/usr/lib64/gcc/i686-w64-mingw32/4.8.4/../../../../i686-w64-mingw32/bin/as'
  output:          
    - '-o $O'
linker:          
  exe: '/usr/libexec/gcc/i686-w64-mingw32/4.8.4/collect2'
  output:          
    - '-o $O'
  start:           
    #- -e _start
  opt_static:      
    - -Bstatic
  opt_rdynamic:    
    - -export-dynamic
  opt_dynamic:     
    - -Bdynamic
  opt_shared:      
    - -shared
  opt_notshared:   
    - -dynamic-linker /usr/libexec/ld.so
  opt_pthread:     
    - -pthread
  options:         
    - -m i386pe
  static_crt1: '/usr/i686-w64-mingw32/sys-root/mingw/lib/../lib/crt2.o'
  dynamic_crt1: '$R/lib/i386-linux-eng/Scrt1.o'
  crtbegin:    '/usr/lib64/gcc/i686-w64-mingw32/4.8.4/crtbegin.o'
  crtend:      '/usr/lib64/gcc/i686-w64-mingw32/4.8.4/crtend.o'
  library_paths:   
    - '-L/usr/lib64/gcc/i686-w64-mingw32/4.8.4'
    - '-L/usr/lib64/gcc/i686-w64-mingw32/4.8.4/../../../../i686-w64-mingw32/lib/../lib'
    - '-L/usr/i686-w64-mingw32/sys-root/mingw/lib/../lib'
    - '-L/usr/lib64/gcc/i686-w64-mingw32/4.8.4/../../../../i686-w64-mingw32/lib'
    - '-L/usr/i686-w64-mingw32/sys-root/mingw/lib'
  cxx_libraries:   
    - '-lc++'
    - -lm
  profile_libraries: 
    - -lprofile_rt
  c_libraries:     
    - '-lmingw32'
    - '-lgcc'
    - '-lgcc_eh'
    - '-lmoldname'
    - '-lmingwex'
    - '-lmsvcrt'
    - '-ladvapi32'
    - '-lshell32'
    - '-luser32'
    - '-lkernel32'
    - '-lmingw32'
    - '-lgcc'
    - '-lgcc_eh'
    - '-lmoldname'
    - '-lmingwex'
    - '-lmsvcrt'
...

I called it i386-w64-mingw32, and, Hey Presto! a Windows cross compiler on my Linux box.

[~] dev% cat main.c
#include <stdio.h>

int main()
{
    printf("hello world\n");
}
[~] dev% ~/ellcc/bin/ecc -target i386-w64-mingw32 main.c
[~] dev% ./a.exe 
fixme:winediag:start_process Wine-Compholio is a Wine testing version containing experimental patches.
fixme:winediag:start_process Please don't report bugs at winehq.org and use our issue tracker instead:
fixme:winediag:start_process https://github.com/compholio/wine-compholio/issues
hello world
[~] dev% file a.exe
a.exe: PE32 executable (console) Intel 80386, for MS Windows
[~] dev%