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RE: problem with cross-compilation i686-pc-mingw32

\#Cyrille37\# wrote on 27 March 2008 08:04:

> Hello
> I could not find how to setup cygwin to make cross compilation for host
> i686-pc-mingw32.
> I've got packages like :
> gcc                  3.4.4-3
> gcc-core             3.4.4-3
> gcc-g++              3.4.4-3
> gcc-mingw            20040810-1
> gcc-mingw-core       20050522-1
> gcc-mingw-g++        20050522-1

  Ok, that's everything you need.
> but when running the configure for GMPlib it could not find
> some tools :

> checking compiler i686-pc-mingw32-gcc -m32 -O2
> -fomit-frame-pointer ... no
> checking compiler i686-pc-mingw32-gcc -O2 -fomit-frame-pointer ... no
> checking compiler gcc -m32 -O2 -fomit-frame-pointer ... yes
> checking compiler gcc -m32 -O2 -fomit-frame-pointer has
> sizeof(long)==4... yes ...
> checking for i686-pc-mingw32-g++... no
> checking for i686-pc-mingw32-c++... no
> checking for i686-pc-mingw32-gpp... no
> checking for i686-pc-mingw32-aCC... no
> checking for i686-pc-mingw32-CC... no
> checking for i686-pc-mingw32-cxx... no
> checking for i686-pc-mingw32-cc++... no
> checking for i686-pc-mingw32-cl... no
> checking for i686-pc-mingw32-FCC... no
> checking for i686-pc-mingw32-KCC... no
> checking for i686-pc-mingw32-RCC... no
> checking for i686-pc-mingw32-xlC_r... no
> checking for i686-pc-mingw32-xlC... no

> Do you know which packages are missing in my cygwin installation ?

  Nothing is missing.  What is happening is that cygwin's mingw
cross-compiler is actually built-in to the main system gcc.  You activate it
by passing the flag "-mno-cygwin" to gcc.  So you need to tell configure to
use the main system compiler and pass this flag when compiling.  This can be
done by adding

  CC_FOR_TARGET="gcc -mno-cygwin" CXX_FOR_TARGET="g++ -mno-cygwin"

Can't think of a witty .sigline today....

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