I've seen conflicting information about what configure flags to use when cross-compiling for a lower x86 architecture on an x86. For example cross-compiling for a i486 on an i686. Not even sure if this should be called crosscompiling?
For most packages you just need to set CFLAGS or similar to include -march for the lower platform, but for some packages setting --host= and --target= is needed, especially gcc, glibc and binutils.
see http://www.linuxfromscratch.org/hints/downloads/files/crosscompiling-x86.txt for examples.
This gives a warning message at the start of each compilation because a crosscompiler is not detected, and I was wondering if --build= is the appropriate arg to use instead (seeing as we're already probably already lying about the build architecture via uname).
e.g. building for an i486 on a i686 is the following correct?
./configure --build=i486-pc-linux-gnu
instead of
./configure --host=i486-pc-linux-gnu --target=i486-pc-linux-gnu
Thanks,
Marcus.
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