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Update cross-compilation instructions.

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* README (Cross building Guile): Update.
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Ludovic Courtès 2011-11-23 22:19:40 +01:00
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@ -239,25 +239,28 @@ switches specific to Guile you may find useful in some circumstances.
Cross building Guile =====================================================
As of guile-1.5.x, the build process uses compiled C files for
snarfing, and (indirectly, through libtool) for linking, and uses the
guile executable for generating documentation.
As of Guile 2.0.x, the build process produces a library, libguile-2.0,
along with Guile "object files" containing bytecode to be interpreted by
Guile's virtual machine. The bytecode format depends on the endianness
and word size of the host CPU.
When cross building guile, you first need to configure, build and
install guile for your build host.
Thus, when cross building Guile, you first need to configure, build and
install it for your build host.
Then, you may configure guile for cross building, eg:
Then, you may configure Guile for cross building:
./configure --host=i686-pc-cygwin --disable-shared
A C compiler for the build system is required. The default is
"PATH=/usr/bin:$PATH cc". If that doesn't suit it can be specified
with the CC_FOR_BUILD variable in the usual way, for instance
A C compiler for the build system is required. If that doesn't suit it
can be specified with the CC_FOR_BUILD variable in the usual way, for
instance:
./configure --host=m68k-unknown-linux-gnu CC_FOR_BUILD=/my/local/gcc
Guile for the build system can be specified similarly with the
GUILE_FOR_BUILD variable, it defaults to just "guile".
GUILE_FOR_BUILD variable, which defaults to whatever `guile' executable
is found in $PATH. It must have the exact same version has the Guile
that you intend to cross-build.
Using Guile Without Installing It =========================================