mirror of
https://github.com/NixOS/nix.git
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Update documentation to refer to Meson not Make in most places
This is necessary to make the Meson one the default and preferred one. Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
This commit is contained in:
John Ericson
parent
aeabe68291
commit
ceae25825f
@ -34,16 +34,21 @@ $ nix-shell --attr devShells.x86_64-linux.native-clangStdenvPackages
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To build Nix itself in this shell:
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```console
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[nix-shell]$ autoreconfPhase
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[nix-shell]$ ./configure $configureFlags --prefix=$(pwd)/outputs/out
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[nix-shell]$ make -j $NIX_BUILD_CORES
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[nix-shell]$ mesonFlags+=" --prefix=$(pwd)/outputs/out"
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[nix-shell]$ dontAddPrefix=1 mesonConfigurePhase
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[nix-shell]$ ninjaBuildPhase
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```
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To install it in `$(pwd)/outputs` and test it:
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To test it:
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```console
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[nix-shell]$ make install
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[nix-shell]$ make installcheck -j $NIX_BUILD_CORES
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[nix-shell]$ mesonCheckPhase
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```
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To install it in `$(pwd)/outputs`:
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```console
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[nix-shell]$ ninjaInstallPhase
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[nix-shell]$ ./outputs/out/bin/nix --version
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nix (Nix) 2.12
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```
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@ -85,16 +90,20 @@ $ nix develop .#native-clangStdenvPackages
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To build Nix itself in this shell:
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```console
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[nix-shell]$ autoreconfPhase
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[nix-shell]$ configurePhase
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[nix-shell]$ make -j $NIX_BUILD_CORES OPTIMIZE=0
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[nix-shell]$ mesonConfigurePhase
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[nix-shell]$ ninjaBuildPhase
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```
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To install it in `$(pwd)/outputs` and test it:
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To test it:
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```console
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[nix-shell]$ make install OPTIMIZE=0
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[nix-shell]$ make installcheck check -j $NIX_BUILD_CORES
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[nix-shell]$ mesonCheckPhase
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```
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To install it in `$(pwd)/outputs`:
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```console
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[nix-shell]$ ninjaInstallPhase
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[nix-shell]$ nix --version
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nix (Nix) 2.12
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```
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@ -110,25 +119,6 @@ $ nix build
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You can also build Nix for one of the [supported platforms](#platforms).
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## Makefile variables
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You may need `profiledir=$out/etc/profile.d` and `sysconfdir=$out/etc` to run `make install`.
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Run `make` with [`-e` / `--environment-overrides`](https://www.gnu.org/software/make/manual/make.html#index-_002de) to allow environment variables to override `Makefile` variables:
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- `ENABLE_BUILD=yes` to enable building the C++ code.
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- `ENABLE_DOC_GEN=yes` to enable building the documentation (manual, man pages, etc.).
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The docs can take a while to build, so you may want to disable this for local development.
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- `ENABLE_FUNCTIONAL_TESTS=yes` to enable building the functional tests.
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- `OPTIMIZE=1` to enable optimizations.
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- `libraries=libutil programs=` to only build a specific library.
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This will fail in the linking phase if the other libraries haven't been built, but is useful for checking types.
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- `libraries= programs=nix` to only build a specific program.
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This will not work in general, because the programs need the libraries.
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## Platforms
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Nix can be built for various platforms, as specified in [`flake.nix`]:
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@ -175,27 +165,38 @@ Add more [system types](#system-type) to `crossSystems` in `flake.nix` to bootst
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It is useful to perform multiple cross and native builds on the same source tree,
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for example to ensure that better support for one platform doesn't break the build for another.
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In order to facilitate this, Nix has some support for being built out of tree – that is, placing build artefacts in a different directory than the source code:
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Meson thankfully makes this very easy by confining all build products to the build directory --- one simple shares the source directory between multiple build directories, each of which contains the build for Nix to a different platform.
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1. Create a directory for the build, e.g.
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Nixpkgs's `mesonConfigurePhase` always chooses `build` in the current directory as the name and location of the build.
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This makes having multiple build directories slightly more inconvenient.
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The good news is that Meson/Ninja seem to cope well with relocating the build directory after it is created.
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Here's how to do that
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1. Configure as usual
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```bash
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mkdir build
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mesonConfigurePhase
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```
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2. Run the configure script from that directory, e.g.
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2. Rename the build directory
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```bash
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cd build
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../configure <configure flags>
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cd .. # since `mesonConfigurePhase` cd'd inside
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mv build build-linux # or whatever name we want
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cd build-linux
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```
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3. Run make from the source directory, but with the build directory specified, e.g.
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3. Build as usual
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```bash
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make builddir=build <make flags>
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ninjaBuildPhase
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```
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> **N.B.**
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> [`nixpkgs#335818`](https://github.com/NixOS/nixpkgs/issues/335818) tracks giving `mesonConfigurePhase` proper support for custom build directories.
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> When it is fixed, we can simplify these instructions and then remove this notice.
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## System type
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Nix uses a string with the following format to identify the *system type* or *platform* it runs on:
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@ -257,11 +258,8 @@ You can use any of the other supported environments in place of `nix-ccacheStden
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The `clangd` LSP server is installed by default on the `clang`-based `devShell`s.
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See [supported compilation environments](#compilation-environments) and instructions how to set up a shell [with flakes](#nix-with-flakes) or in [classic Nix](#classic-nix).
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To use the LSP with your editor, you first need to [set up `clangd`](https://clangd.llvm.org/installation#project-setup) by running:
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```console
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make compile_commands.json
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```
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To use the LSP with your editor, you will want a `compile_commands.json` file telling `clangd` how we are compiling the code.
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Meson's configure always produces this inside the build directory.
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Configure your editor to use the `clangd` from the `.#native-clangStdenvPackages` shell. You can do that either by running it inside the development shell, or by using [nix-direnv](https://github.com/nix-community/nix-direnv) and [the appropriate editor plugin](https://github.com/direnv/direnv/wiki#editor-integration).
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@ -276,7 +274,7 @@ Configure your editor to use the `clangd` from the `.#native-clangStdenvPackages
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You may run the formatters as a one-off using:
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```console
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make format
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./maintainers/format.sh
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```
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If you'd like to run the formatters before every commit, install the hooks:
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@ -135,60 +135,52 @@ Functional tests are run during `installCheck` in the `nix` package build, as we
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### Running the whole test suite
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The whole test suite can be run with:
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The whole test suite (functional and unit tests) can be run with:
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```shell-session
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$ make install && make installcheck
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ran test tests/functional/foo.sh... [PASS]
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ran test tests/functional/bar.sh... [PASS]
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...
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$ mesonCheckPhase
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```
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### Grouping tests
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Sometimes it is useful to group related tests so they can be easily run together without running the entire test suite.
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Each test group is in a subdirectory of `tests`.
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For example, `tests/functional/ca/local.mk` defines a `ca` test group for content-addressed derivation outputs.
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For example, `tests/functional/ca/meson.build` defines a `ca` test group for content-addressed derivation outputs.
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That test group can be run like this:
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```shell-session
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$ make ca.test-group -j50
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ran test tests/functional/ca/nix-run.sh... [PASS]
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ran test tests/functional/ca/import-derivation.sh... [PASS]
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...
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```
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The test group is defined in Make like this:
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```makefile
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$(test-group-name)-tests := \
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$(d)/test0.sh \
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$(d)/test1.sh \
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...
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install-tests-groups += $(test-group-name)
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$ meson test --suite ca
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ninja: Entering directory `/home/jcericson/src/nix/master/build'
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ninja: no work to do.
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[1-20/20] 🌑 nix-functional-tests:ca / ca/why-depends 1/20 nix-functional-tests:ca / ca/nix-run OK 0.16s
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[2-20/20] 🌒 nix-functional-tests:ca / ca/why-depends 2/20 nix-functional-tests:ca / ca/import-derivation OK 0.17s
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```
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### Running individual tests
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Individual tests can be run with `make`:
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Individual tests can be run with `meson`:
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```shell-session
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$ make tests/functional/${testName}.sh.test
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ran test tests/functional/${testName}.sh... [PASS]
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$ meson test ${testName}
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ninja: Entering directory `/home/jcericson/src/nix/master/build'
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ninja: no work to do.
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1/1 nix-functional-tests:main / ${testName} OK 0.41s
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Ok: 1
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Expected Fail: 0
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Fail: 0
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Unexpected Pass: 0
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Skipped: 0
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Timeout: 0
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Full log written to /home/jcericson/src/nix/master/build/meson-logs/testlog.txt
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```
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or without `make`:
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or without `meson`, showing the output:
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```shell-session
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$ ./mk/run-test.sh tests/functional/${testName}.sh
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ran test tests/functional/${testName}.sh... [PASS]
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```
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To see the complete output, one can also run:
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```shell-session
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$ ./mk/debug-test.sh tests/functional/${testName}.sh
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$ TEST_NAME=${testName} NIX_REMOTE='' PS4='+(${BASH_SOURCE[0]-$0}:$LINENO) tests/functional/${testName}.sh
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+(${testName}.sh:1) foo
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output from foo
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+(${testName}.sh:2) bar
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@ -254,7 +246,7 @@ It is frequently useful to regenerate the expected output.
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To do that, rerun the failed test(s) with `_NIX_TEST_ACCEPT=1`.
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For example:
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```bash
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_NIX_TEST_ACCEPT=1 make tests/functional/lang.sh.test
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_NIX_TEST_ACCEPT=1 meson test lang
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```
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This convention is shared with the [characterisation unit tests](#characterisation-testing-unit) too.
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@ -1,31 +1,26 @@
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# Building Nix from Source
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After cloning Nix's Git repository, issue the following commands:
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Nix is built with [Meson](https://mesonbuild.com/).
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It is broken up into multiple Meson packages, which are optionally combined in a single project using Meson's [subprojects](https://mesonbuild.com/Subprojects.html) feature.
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```console
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$ autoreconf -vfi
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$ ./configure options...
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$ make
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$ make install
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```
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There are no mandatory extra steps to the building process:
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generic Meson installation instructions like [this](https://mesonbuild.com/Quick-guide.html#using-meson-as-a-distro-packager) should work.
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Nix requires GNU Make so you may need to invoke `gmake` instead.
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The installation path can be specified by passing the `--prefix=prefix`
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The installation path can be specified by passing the `-Dprefix=prefix`
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to `configure`. The default installation directory is `/usr/local`. You
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can change this to any location you like. You must have write permission
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to the *prefix* path.
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Nix keeps its *store* (the place where packages are stored) in
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`/nix/store` by default. This can be changed using
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`--with-store-dir=path`.
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`-Dstore-dir=path`.
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> **Warning**
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>
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>
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> It is best *not* to change the Nix store from its default, since doing
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> so makes it impossible to use pre-built binaries from the standard
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> Nixpkgs channels — that is, all packages will need to be built from
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> source.
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Nix keeps state (such as its database and log files) in `/nix/var` by
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default. This can be changed using `--localstatedir=path`.
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default. This can be changed using `-Dlocalstatedir=path`.
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11
maintainers/format.sh
Executable file
11
maintainers/format.sh
Executable file
@ -0,0 +1,11 @@
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#!/usr/bin/env bash
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if ! type -p pre-commit &>/dev/null; then
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echo "format.sh: pre-commit not found. Please use \`nix develop\`.";
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exit 1;
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fi;
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if test -z "$_NIX_PRE_COMMIT_HOOKS_CONFIG"; then
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echo "format.sh: _NIX_PRE_COMMIT_HOOKS_CONFIG not set. Please use \`nix develop\`.";
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exit 1;
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fi;
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pre-commit run --config "$_NIX_PRE_COMMIT_HOOKS_CONFIG" --all-files
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@ -3,13 +3,6 @@
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print-top-help += echo ' format: Format source code'
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# This uses the cached .pre-commit-hooks.yaml file
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fmt_script := $(d)/format.sh
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format:
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@if ! type -p pre-commit &>/dev/null; then \
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echo "make format: pre-commit not found. Please use \`nix develop\`."; \
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exit 1; \
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fi; \
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if test -z "$$_NIX_PRE_COMMIT_HOOKS_CONFIG"; then \
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echo "make format: _NIX_PRE_COMMIT_HOOKS_CONFIG not set. Please use \`nix develop\`."; \
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exit 1; \
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fi; \
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pre-commit run --config $$_NIX_PRE_COMMIT_HOOKS_CONFIG --all-files
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@$(fmt_script)
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