From aa6b5762564af7fc2a01791183db684872311f48 Mon Sep 17 00:00:00 2001 From: Jussi Pakkanen Date: Mon, 27 Nov 2017 21:50:20 +0200 Subject: [PATCH] Reformatted and fixed running doc. --- docs/markdown/Running-Meson.md | 102 ++++++++++++++++++++++++++------- 1 file changed, 80 insertions(+), 22 deletions(-) diff --git a/docs/markdown/Running-Meson.md b/docs/markdown/Running-Meson.md index 0e8da43d3..23d5e97b5 100644 --- a/docs/markdown/Running-Meson.md +++ b/docs/markdown/Running-Meson.md @@ -1,17 +1,26 @@ --- -short-description: Building a project with meson +short-description: Building a project with Meson ... -# Running meson +# Running Meson -There are two different ways of invoking Meson. First, you can run it directly from the source tree with the command `/path/to/source/meson.py`. Meson may also be installed in which case the command is simply `meson`. In this manual we only use the latter format for simplicity. +There are two different ways of invoking Meson. First, you can run it +directly from the source tree with the command +`/path/to/source/meson.py`. Meson may also be installed in which case +the command is simply `meson`. In this manual we only use the latter +format for simplicity. -At the time of writing only a command line version of Meson is available. This means that Meson must be invoked using the terminal. If you wish to use the MSVC compiler, you need to run Meson under "Visual Studio command prompt". +At the time of writing only a command line version of Meson is +available. This means that Meson must be invoked using the +terminal. If you wish to use the MSVC compiler, you need to run Meson +under "Visual Studio command prompt". Configuring the source == -Let us assume that we have a source tree that has a Meson build system. This means that at the topmost directory has a file called `meson.build`. We run the following commands to get the build started. +Let us assume that we have a source tree that has a Meson build +system. This means that at the topmost directory has a file called +`meson.build`. We run the following commands to get the build started. cd /path/to/source/root @@ -19,13 +28,22 @@ Let us assume that we have a source tree that has a Meson build system. This mea cd builddir meson .. -First we create a directory to hold all files generated during the build. Then we go into it and invoke Meson, giving it the location of the source root. +First we create a directory to hold all files generated during the +build. Then we go into it and invoke Meson, giving it the location of +the source root. -Hint: The syntax of meson is `meson [options] [srcdir] [builddir]`, but you may omit either `srcdir` or `builddir`. Meson will deduce the `srcdir` by the location of `meson.build`. The other one will be your `pwd`. +Hint: The syntax of meson is `meson [options] [srcdir] [builddir]`, +but you may omit either `srcdir` or `builddir`. Meson will deduce the +`srcdir` by the location of `meson.build`. The other one will be your +`pwd`. -Meson then loads the build configuration file and writes the corresponding build backend in the build directory. By default Meson generates a *debug build*, which turns on basic warnings and debug information and disables compiler optimizations. +Meson then loads the build configuration file and writes the +corresponding build backend in the build directory. By default Meson +generates a *debug build*, which turns on basic warnings and debug +information and disables compiler optimizations. -You can specify a different type of build with the `--buildtype` command line argument. It can have one of the following values. +You can specify a different type of build with the `--buildtype` +command line argument. It can have one of the following values. | value | meaning | | ------ | -------- | @@ -34,42 +52,78 @@ You can specify a different type of build with the `--buildtype` command line ar | `debugoptimized` | debug info is generated and the code is optimized (on most compilers this means `-g -O2`) | | `release` | full optimization, no debug info | -The build directory is mandatory. The reason for this is that it simplifies the build process immensely. Meson will not under any circumstances write files inside the source directory (if it does, it is a bug and should be fixed). This means that the user does not need to add a bunch of files to their revision control's ignore list. It also means that you can create arbitrarily many build directories for any given source tree. If we wanted to test building the source code with the Clang compiler instead of the system default, we could just type the following commands. +The build directory is mandatory. The reason for this is that it +simplifies the build process immensely. Meson will not under any +circumstances write files inside the source directory (if it does, it +is a bug and should be fixed). This means that the user does not need +to add a bunch of files to their revision control's ignore list. It +also means that you can create arbitrarily many build directories for +any given source tree. If we wanted to test building the source code +with the Clang compiler instead of the system default, we could just +type the following commands. cd /path/to/source/root mkdir buildclang cd buildclang CC=clang CXX=clang++ meson .. -This separation is even more powerful if your code has multiple configuration options (such as multiple data backends). You can create a separate subdirectory for each of them. You can also have build directories for optimized builds, code coverage, static analysis and so on. They are all neatly separated and use the same source tree. Changing between different configurations is just a question of changing to the corresponding directory. +This separation is even more powerful if your code has multiple +configuration options (such as multiple data backends). You can create +a separate subdirectory for each of them. You can also have build +directories for optimized builds, code coverage, static analysis and +so on. They are all neatly separated and use the same source +tree. Changing between different configurations is just a question of +changing to the corresponding directory. -Unless otherwise mentioned, all following command line invocations are meant to be run in the build directory. +Unless otherwise mentioned, all following command line invocations are +meant to be run in the build directory. -By default Meson will use the Ninja backend to build your project. If you wish to use any of the other backends, you need to pass the corresponding argument during configuration time. As an example, here is how you would use Meson to generate a Visual studio solution. +By default Meson will use the Ninja backend to build your project. If +you wish to use any of the other backends, you need to pass the +corresponding argument during configuration time. As an example, here +is how you would use Meson to generate a Visual studio solution. meson --backend=vs2010 -You can then open the generated solution with Visual Studio and compile it in the usual way. A list of backends can be obtained with `meson --help`. +You can then open the generated solution with Visual Studio and +compile it in the usual way. A list of backends can be obtained with +`meson --help`. Building the source == -If you are not using an IDE, Meson uses the [Ninja build system](https://ninja-build.org/) to actually build the code. To start the build, simply type the following command. +If you are not using an IDE, Meson uses the [Ninja build +system](https://ninja-build.org/) to actually build the code. To start +the build, simply type the following command. ninja -The main usability difference between Ninja and Make is that Ninja will automatically detect the number of CPUs in your computer and parallelize itself accordingly. You can override the amount of parallel processes used with the command line argument `-j `. - -It should be noted that after the initial configure step `ninja` is the only command you ever need to type to compile. No matter how you alter your source tree (short of moving it to a completely new location), Meson will detect the changes and regenerate itself accordingly. This is especially handy if you have multiple build directories. Often one of them is used for development (the "debug" build) and others only every now and then (such as a "static analysis" build). Any configuration can be built just by `cd`'ing to the corresponding directory and running Ninja. +The main usability difference between Ninja and Make is that Ninja +will automatically detect the number of CPUs in your computer and +parallelize itself accordingly. You can override the amount of +parallel processes used with the command line argument `-j `. + +It should be noted that after the initial configure step `ninja` is +the only command you ever need to type to compile. No matter how you +alter your source tree (short of moving it to a completely new +location), Meson will detect the changes and regenerate itself +accordingly. This is especially handy if you have multiple build +directories. Often one of them is used for development (the "debug" +build) and others only every now and then (such as a "static analysis" +build). Any configuration can be built just by `cd`'ing to the +corresponding directory and running Ninja. Running tests == -Meson provides native support for running tests. The command to do that is simple. +Meson provides native support for running tests. The command to do +that is simple. ninja test -Meson does not force the use of any particular testing framework. You are free to use GTest, Boost Test, Check or even custom executables. +Meson does not force the use of any particular testing framework. You +are free to use GTest, Boost Test, Check or even custom executables. Installing == @@ -78,13 +132,17 @@ Installing the built software is just as simple. ninja install -By default Meson installs to `/usr/local`. This can be changed by passing the command line argument `--prefix /your/prefix` to Meson during configure time. Meson also supports the `DESTDIR` variable used in e.g. building packages. It is used like this: +By default Meson installs to `/usr/local`. This can be changed by +passing the command line argument `--prefix /your/prefix` to Meson +during configure time. Meson also supports the `DESTDIR` variable used +in e.g. building packages. It is used like this: DESTDIR=/path/to/staging ninja install Command line help == -Meson has a standard command line help feature. It can be accessed with the following command. +Meson has a standard command line help feature. It can be accessed +with the following command. meson --help