Re: header of the build system is used for cross compiling libstdc++

[Jim Wilson <wilson at specifixinc dot com>]

Hideki IWAMOTO wrote:
>   /home2/iwamoto/work/canadian-test/build/gcc-3.4.0/configure --prefix=/usr \
>     --build=i686-pc-linux-gnu --host=am33_2.0-linux --target=mn10300-elf \
>     --enable-languages=c,c++ --with-newlib

The problem here is that you used --prefix=/usr.  This is setting up the 
canadian cross compiler to install into /usr, which means target header 
files potentially go into /usr/include, which is a problem, because the 
build header files are also in /usr/include.  There is probably no 
actual problem, as target files won't go into /usr/include, but it is 
certainly a confusing situation.  This confusion is causing the build to 
fail.  This is probably not a wise thing to do.  There is a risk of 
clobbering your system compiler if there is a bug in the canadian cross 
support.  Better is to install someplace else, like /opt, or /usr/local.

The code has been there since gcc-3.0 when libstdc++-v3 went into the 
tree, so I can't easily tell why the code is there, or if it is really 
necessary.
--
Jim Wilson, GNU Tools Support, http://www.SpecifixInc.com