The Meson Build System http://mesonbuild.com/
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short-description: Configuring a pre-generated build directory
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# Configuring a build directory
Often you want to change the settings of your build after it has been generated. For example you might want to change from a debug build into a release build, set custom compiler flags, change the build options provided in your `meson_options.txt` file and so on.
The main tool for this is the `mesonconf` script. You may also use the `mesongui` graphical application if you want. However this document describes the use of the command line client.
You invoke `mesonconf` by giving it the location of your build dir. If omitted, the current working directory is used instead. Here's a sample output for a simple project.
Core properties
Source dir /home/jpakkane/clangdemo/2_address
Build dir /home/jpakkane/clangdemo/2_address/buildmeson
Core options
type Build type debug
strip Strip on install False
coverage Coverage report False
pch Precompiled headers True
unity Unity build False
Compiler flags
cflags []
Linker flags
clinkflags []
Directories
installprefix Install prefix /usr/local
libdir Library directory lib
bindir Binary directory bin
includedir Header directory include
datadir Data directory share
mandir Man page directory share/man
localedir Locale file directory share/locale
This project does not have any options
These are all the options available for the current project arranged into related groups. The first column in every field is the name of the option. To set an option you use the `-D` option. For example, changing the installation prefix from `/usr/local` to `/tmp/testroot` you would issue the following command.
mesonconf -Dprefix=/tmp/testroot
Then you would run your build command (usually `ninja`), which would cause Meson to detect that the build setup has changed and do all the work required to bring your build tree up to date.