re: Configure tries to run cross-compiled programs (when buildingcrossgcc under cygwin)

[Dan Kegel <dkegel at ixiacom dot com>]

Brett Hunt wrote in gcc-help in May 2002 (highly edited):
 > [I'm building a cross-compiler on cygwin targetting x86 linux.
 >  The build seems to progress fine until it tries to run 'ltconfig' for libstdc++.
 >  It locks up on "checking whether a program can dlopen itself..."
 >  This is just one of several places the build script improperly
 >  tries to run linux programs on windows.  Why doesn't it notice I'm
 >  building a cross-compiler?]

For his real message, see
http://gcc.gnu.org/ml/gcc-help/2002-05/msg00165.html

I'm running into the exact same thing (I'm trying to build a ppc405
cross-compiler, but the problem is the same).   For reference,
the cygwin gcc I'm using to build this cross-compiler is "2.95.3-5".

At first, I thought it was because I invoked configure wrong, as follows:

  ../gcc-3.0.2/configure --target=powerpc-linux --prefix=/opt/hardhat/devkit/ppc/405 --with-headers=/opt/hardhat/devkit/ppc/405/target/usr/include --enable-shared --enable-long-long
--enable-threads=posix --enable-langugages=c,c++ --enable-cxx-flags=-mcpu=403 --with-cpu=403 --nfp

since the autoconf doc hinted that for cross-compiling, you really need to define
all three of host, build, and target.  So I tried

../gcc-3.0.2/configure --target=powerpc-linux --host=i686-pc-cygwin --build=i686-pc-cygwin --prefix=/opt/hardhat/devkit/ppc/405 --with-headers=/opt/hardhat/devkit/ppc/405/target/usr/include 
--enable-shared --enable-threads=posix --enable-langugages=c,c++ --enable-cxx-flags=-mcpu=403 --with-cpu=403 --nfp

but got the same result, namely: in several places, configure tries to run
powerpc programs on windows, and I get an error dialog box.  Clicking
'close' each time more or less lets configure procede, though perhaps
because it's confused about whether it's a cross-compile, I don't know
if the result is going to be usable.

Anyone out there have a clue for me?

Thanks!
- Dan


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