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doc: Explain how to use the GCC toolchain.

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* doc/guix.texi (Application Setup): Add subsection "The GCC toolchain".
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Ricardo Wurmus 2017-06-16 09:55:00 +02:00
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doc/guix.texi
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@ -1441,6 +1441,30 @@ some reason, you want to avoid auto-loading Emacs packages installed
with Guix, you can do so by running Emacs with @code{--no-site-file}
option (@pxref{Init File,,, emacs, The GNU Emacs Manual}).
@subsection The GCC toolchain
@cindex GCC
@cindex ld-wrapper
Guix offers individual compiler packages such as @code{gcc} but if you
are in need of a complete toolchain for compiling and linking source
code what you really want is the @code{gcc-toolchain} package. This
package provides a complete GCC toolchain for C/C++ development,
including GCC itself, the GNU C Library (headers and binaries, plus
debugging symbols in the @code{debug} output), Binutils, and a linker
wrapper.
@cindex attempt to use impure library, error message
The wrapper's purpose is to inspect the @code{-L} and @code{-l} switches
passed to the linker, add corresponding @code{-rpath} arguments, and
invoke the actual linker with this new set of arguments. By default,
the linker wrapper refuses to link to libraries outside the store to
ensure ``purity''. This can be annoying when using the toolchain to
link with local libraries. To allow references to libraries outside the
store you need to define the environment variable
@code{GUIX_LD_WRAPPER_ALLOW_IMPURITIES}.
@c TODO What else?
@c *********************************************************************