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doc: Add "Packages for C Development" section. 

Suggested by Bruno Haible <bruno@clisp.org>
in <https://bugs.gnu.org/41038>.

* doc/guix.texi (Packages for C Development): New node.
(Application Setup)[The GCC toolchain]: Empty and refer to it.
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Ludovic Courtès 2020-05-04 10:50:18 +02:00
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@ -1768,22 +1768,11 @@ can do so by running Emacs with the @code{--no-site-file} option
@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.
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. You can instruct the
wrapper to refuse to link against libraries not in the store by setting the
@code{GUIX_LD_WRAPPER_ALLOW_IMPURITIES} environment variable to @code{no}.
@c XXX: The contents of this section were moved under
@c ``Development'', since it makes more sense there and is not specific
@c foreign distros. Remove it from here eventually?
@xref{Packages for C Development}, for information on packages for C/C++
development.
@node Upgrading Guix
@section Upgrading Guix
@ -4681,6 +4670,7 @@ easily distributed to users who do not run Guix.
@menu
* Invoking guix environment:: Setting up development environments.
* Invoking guix pack:: Creating software bundles.
* Packages for C Development:: Working with C code with Guix.
@end menu
@node Invoking guix environment
@ -5344,6 +5334,27 @@ In addition, @command{guix pack} supports all the common build options
(@pxref{Common Build Options}) and all the package transformation
options (@pxref{Package Transformation Options}).
@node Packages for C Development
@section Packages for C Development
@cindex GCC
@cindex ld-wrapper
@cindex linker wrapper
@cindex toolchain, for C development
If you need a complete toolchain for compiling and linking C or C++
source code, use 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.
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. You can instruct the
wrapper to refuse to link against libraries not in the store by setting the
@code{GUIX_LD_WRAPPER_ALLOW_IMPURITIES} environment variable to @code{no}.
@c *********************************************************************
@node Programming Interface