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/* This file contains various functions that take a stdenv and return
a new stdenv with different behaviour, e.g. using a different C
compiler. */
{dietlibc, fetchurl, runCommand}:
rec {
# Override the compiler in stdenv for specific packages.
overrideGCC = stdenv: gcc: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // { NIX_GCC = gcc; });
};
# Add some arbitrary packages to buildInputs for specific packages.
# Used to override packages in stenv like Make. Should not be used
# for other dependencies.
overrideInStdenv = stdenv: pkgs: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args //
{ buildInputs = (if args ? buildInputs then args.buildInputs else []) ++ pkgs; }
);
};
# Override the setup script of stdenv. Useful for testing new
# versions of the setup script without causing a rebuild of
# everything.
#
# Example:
# randomPkg = import ../bla { ...
# stdenv = overrideSetup stdenv ../stdenv/generic/setup-latest.sh;
# };
overrideSetup = stdenv: setup: stdenv.regenerate setup;
# Return a modified stdenv that uses dietlibc to create small
# statically linked binaries.
useDietLibC = stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // {
NIX_CFLAGS_LINK = "-static";
# libcompat.a contains some commonly used functions.
NIX_LDFLAGS = "-lcompat";
# These are added *after* the command-line flags, so we'll
# always optimise for size.
NIX_CFLAGS_COMPILE =
(if args ? NIX_CFLAGS_COMPILE then args.NIX_CFLAGS_COMPILE else "")
+ " -Os -s -D_BSD_SOURCE=1";
configureFlags =
(if args ? configureFlags then args.configureFlags else "")
+ " --disable-shared"; # brrr...
NIX_GCC = import ../build-support/gcc-wrapper {
inherit stdenv;
libc = dietlibc;
inherit (stdenv.gcc) gcc binutils nativeTools nativePrefix;
nativeLibc = false;
};
});
isDietLibC = true;
} // {inherit fetchurl;};
# Return a modified stdenv that uses klibc to create small
# statically linked binaries.
useKlibc = stdenv: klibc: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // {
NIX_CFLAGS_LINK = "-static";
# These are added *after* the command-line flags, so we'll
# always optimise for size.
NIX_CFLAGS_COMPILE =
(if args ? NIX_CFLAGS_COMPILE then args.NIX_CFLAGS_COMPILE else "")
+ " -Os -s";
configureFlags =
(if args ? configureFlags then args.configureFlags else "")
+ " --disable-shared"; # brrr...
NIX_GCC = runCommand "klibc-wrapper" {} ''
ensureDir $out/bin
ln -s ${klibc}/bin/klcc $out/bin/gcc
ln -s ${klibc}/bin/klcc $out/bin/cc
ensureDir $out/nix-support
echo 'PATH=$PATH:${stdenv.gcc.binutils}/bin' > $out/nix-support/setup-hook
'';
});
isKlibc = true;
isStatic = true;
} // {inherit fetchurl;};
# Return a modified stdenv that tries to build statically linked
# binaries.
makeStaticBinaries = stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // {
NIX_CFLAGS_LINK = "-static";
configureFlags =
(if args ? configureFlags then args.configureFlags else "")
+ " --disable-shared"; # brrr...
});
isStatic = true;
} // {inherit fetchurl;};
/* Modify a stdenv so that the specified attributes are added to
every derivation returned by its mkDerivation function.
Example:
stdenvNoOptimise =
addAttrsToDerivation
{ NIX_CFLAGS_COMPILE = "-O0"; }
stdenv;
*/
addAttrsToDerivation = extraAttrs: stdenv: stdenv //
{ mkDerivation = args: stdenv.mkDerivation (args // extraAttrs); };
/* Return a modified stdenv that perfoms the build under $out/.build
instead of in $TMPDIR. Thus, the sources are kept available.
This is useful for things like debugging or generation of
dynamic analysis reports. */
keepBuildTree = stdenv:
addAttrsToDerivation
{ prePhases = "moveBuildDir";
moveBuildDir =
''
ensureDir $out/.build
cd $out/.build
'';
} stdenv;
cleanupBuildTree = stdenv:
addAttrsToDerivation
{ postPhases = "cleanupBuildDir";
# Get rid of everything that isn't a gcno file or a C source
# file. This also includes the gcda files; we're not
# interested in coverage resulting from the package's own test
# suite.
cleanupBuildDir =
''
find $out/.build/ -type f -a ! \
\( -name "*.c" -o -name "*.h" -o -name "*.gcno" \) \
| xargs rm -f --
'';
} stdenv;
/* Return a modified stdenv that builds packages with GCC's coverage
instrumentation. The coverage note files (*.gcno) are stored in
$out/.build, along with the source code of the package, to enable
programs like lcov to produce pretty-printed reports.
*/
addCoverageInstrumentation = stdenv:
addAttrsToDerivation
{ NIX_CFLAGS_COMPILE = "-O0 --coverage";
# This is an uberhack to prevent libtool from removing gcno
# files. This has been fixed in libtool, but there are
# packages out there with old ltmain.sh scripts.
# See http://www.mail-archive.com/libtool@gnu.org/msg10725.html
postUnpack =
''
for i in $(find -name ltmain.sh); do
substituteInPlace $i --replace '*.$objext)' '*.$objext | *.gcno)'
done
'';
}
# Object files instrumented with coverage analysis write
# runtime coverage data to <path>/<object>.gcda, where <path>
# is the location where gcc originally created the object
# file. That would be /tmp/nix-build-<something>, which will
# be long gone by the time we run the program. Furthermore,
# the <object>.gcno files created at compile time are also
# written there. And to make nice coverage reports with lcov,
# we need the source code. So we have to use the
# `keepBuildTree' adapter as well.
(cleanupBuildTree (keepBuildTree stdenv));
/* Replace the meta.maintainers field of a derivation. This is useful
when you want to fork to update some packages without disturbing other
developers.
e.g.: in all-packages.nix:
# remove all maintainers.
defaultStdenv = replaceMaintainersField allStdenvs.stdenv pkgs [];
*/
replaceMaintainersField = stdenv: pkgs: maintainers: stdenv //
{ mkDerivation = args:
pkgs.lib.recursiveUpdate
(stdenv.mkDerivation args)
{ meta.maintainers = maintainers; };
};
/* Use the trace output to report all processed derivations with their
license name.
*/
traceDrvLicenses = stdenv: stdenv //
{ mkDerivation = args:
let
pkg = stdenv.mkDerivation args;
printDrvPath = val: let
drvPath = builtins.unsafeDiscardStringContext pkg.drvPath;
license =
if pkg ? meta && pkg.meta ? license then
pkg.meta.license
else
null;
in
builtins.trace "@:drv:${toString drvPath}:${builtins.exprToString license}:@"
val;
in pkg // {
outPath = printDrvPath pkg.outPath;
drvPath = printDrvPath pkg.drvPath;
};
};
}
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