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Diffstat (limited to 'doc/guix.texi')
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diff --git a/doc/guix.texi b/doc/guix.texi index e084144a82..7150adeaa8 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -9364,6 +9364,44 @@ must be compatible. If @var{replacement} is somehow incompatible with @var{package}, then the resulting package may be unusable. Use with care! +@cindex tool chain, changing the build tool chain of a package +@item --with-c-toolchain=@var{package}=@var{toolchain} +This option changes the compilation of @var{package} and everything that +depends on it so that they get built with @var{toolchain} instead of the +default GNU tool chain for C/C++. + +Consider this example: + +@example +guix build octave-cli \ + --with-c-toolchain=fftw=gcc-toolchain@@10 \ + --with-c-toolchain=fftwf=gcc-toolchain@@10 +@end example + +The command above builds a variant of the @code{fftw} and @code{fftwf} +packages using version 10 of @code{gcc-toolchain} instead of the default +tool chain, and then builds a variant of the GNU@tie{}Octave +command-line interface using them. GNU@tie{}Octave itself is also built +with @code{gcc-toolchain@@10}. + +This other example builds the Hardware Locality (@code{hwloc}) library +and its dependents up to @code{intel-mpi-benchmarks} with the Clang C +compiler: + +@example +guix build --with-c-toolchain=hwloc=clang-toolchain \ + intel-mpi-benchmarks +@end example + +@quotation Note +There can be application binary interface (ABI) incompatibilities among +tool chains. This is particularly true of the C++ standard library and +run-time support libraries such as that of OpenMP. By rebuilding all +dependents with the same tool chain, @option{--with-c-toolchain} minimizes +the risks of incompatibility but cannot entirely eliminate them. Choose +@var{package} wisely. +@end quotation + @item --with-git-url=@var{package}=@var{url} @cindex Git, using the latest commit @cindex latest commit, building |