GYP build parameters

Chromium no longer uses GYP but GN. The corresponding page is GN build configuration.

Hence, the following is obsolete.

GYP has many environment variables that configure the way Chrome is built. By modifying these parameters, you can build chrome for different architectures, or speed up the build process. Generally, we strive to have good defaults and you shouldn't have to set many of these. The wiki also has some additional tips on common build tasks.

Specifying parameters

Command-line

To specify build parameters for GYP, you can do so on the command line:

$ ./build/gyp_chromium -Dchromeos=1 -Dcomponent=shared_library

Environment variable

Or with an environment variable:

$ export GYP_DEFINES="chromeos=1 component=shared_library" $ ./build/gyp_chromium

chromium.gyp_env file

Or in a chromium.gyp_env file in your chromium directory:

$ echo "{ 'GYP_DEFINES': 'chromeos=1 component=shared_library' }" > ../chromium.gyp_env

Some common file examples:

Windows:

{ 'GYP_DEFINES': 'component=shared_library' }

Mac:

{ 'GYP_DEFINES': 'fastbuild=1' }

Linux:

{ 'GYP_DEFINES': 'component=shared_library remove_webcore_debug_symbols=1' }

ChromeOS on Linux:

{ 'GYP_DEFINES': 'chromeos=1 component=shared_library remove_webcore_debug_symbols=1' }

Android:

{ 'GYP_DEFINES': 'OS=android' }

Recommended Parameters

For a full list of the main build variables and their defaults, see the variables section in any *.gyp or *.gypi file, e.g.:

$ cat build/common.gypi

### Variable	### Explanation	### Linux	### Windows	### Mac
component=shared_library	If you dynamically link, you save a lot of time linking for a small time cost during startup. On Windows, this uses a DLL build and incremental linking, which makes linking much faster in Debug.
fastbuild=1	Optional: removes all debug information, but builds much faster. 0 means all debug symbols (.pdb generated from .obj), 1 means link time symbols (.pdb generated from .lib) and 2 means no pdb at all (no debug information). In practice 0 and 1, will generate the exact same PE. Only 2 will generate a PE that could have it's .rdata to be ~40 bytes smaller.
remove_webcore_debug_symbols=1	If you don't need to trace into WebKit, you can cut down the size and slowness of debug builds significantly by building WebKit without debug symbols.

Building a release build

To build Chrome in a release build, as well as building in the out/Release directory, you may add the following flags:

### Variable	### Explanation	### Linux	### Windows	### Mac
buildtype=Official	Builds the heavily optimized official release build (invalid for builds in out/Debug). Other options include 'Dev', for development/testing. Official builds take *drastically* longer to build, and are most likely not what you want.
branding=Chrome	Changes the branding from 'Chromium' to 'Chrome', for official builds.

Use the icecc linker (Linux only)

Icecc is the distributed compiler with a central scheduler to share build load. Currently, many external contributors use it. e.g. Intel, Opera, Samsung.

### Variable	### Explanation	### Linux	### Windows	### Mac
linux_use_bundled_binutils=0	-B option is not supported. See this commit for more details.
linux_use_debug_fission=0	Debug fission is not supported. See this bug for more details.
clang=0	Icecc doesn't support clang yet.

Build ChromeOS on Linux (Linux only)

To build ChromeOS on Linux, use the following gyp variables and the regular chrome target will run ChromeOS instead of Chrome.

### Variable	### Explanation	### Linux	### Windows	### Mac
chromeos=1	Build for the ChromeOS platform instead of Linux.

Build Android (Linux only)

To build ChromeOS on Linux, use the following gyp variables and the either the chrome_shell_apk or webview_instrumentation_apk target.

### Variable	### Explanation	### Linux	### Windows	### Mac
OS=android	Build for the Android platform instead of Linux.
target_arch=ia32	Optional. Use this if building for x86 targets.
target_arch=mipsel	Optional. Use this if building for MIPS targets.