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author | Dan Willemsen <dwillemsen@google.com> | 2015-09-09 16:51:09 -0700 |
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committer | Dan Willemsen <dwillemsen@google.com> | 2015-09-10 00:20:12 +0000 |
commit | 0b6c3481d50df40864dd10f0792f8d8a4ac7a5c0 (patch) | |
tree | e52af09ab652511727a25c049cb52040c32571a1 | |
parent | c8db47a0213aa5c204c140cb9268389b4175ae06 (diff) | |
download | build-0b6c3481d50df40864dd10f0792f8d8a4ac7a5c0.tar.gz |
Update the build system doc
This adds a reference to the _{32|64|arm|arm64|...|darwin|linux|windows}
variables, and adds information about how LOCAL_MODULE_HOST_OS works.
It also removes many (but not all) obsolete references.
Bug: 23566667
Change-Id: Ief16a5e245eb65ac00fc23d4fc1b7a409a7a64bd
-rw-r--r-- | core/build-system.html | 118 |
1 files changed, 54 insertions, 64 deletions
diff --git a/core/build-system.html b/core/build-system.html index caade583b7..3f638c3b07 100644 --- a/core/build-system.html +++ b/core/build-system.html @@ -462,26 +462,17 @@ LOCAL_GENERATED_SOURCES += $(GEN) <p>Sometimes you need to set flags specifically for different platforms. Here is a list of which values the different build-system defined variables will be set to and some examples.</p> -<p>For a device build, <code>TARGET_OS</code> is <code>linux</code> (we're using -linux!), and <code>TARGET_ARCH</code> is <code>arm</code>.</p> -<p>For a simulator build, <code>TARGET_OS</code> and <code>TARGET_ARCH</code> -are set to the same as <code>HOST_OS</code> and <code>HOST_ARCH</code> are -on your platform. <code>TARGET_PRODUCT</code> is the name of the target -hardware/product you are building for. The value <code>sim</code> is used -for the simulator. We haven't thought through the full extent of customization -that will happen here, but likely there will be additional UI configurations -specified here as well.</p> <table cellspacing=25> <tr> <td valign=top align=center> <b>HOST_OS</b><br/> linux<br/> - darwin<br/> - (cygwin) + darwin </td> <td valign=top align=center> <b>HOST_ARCH</b><br/> - x86 + x86<br/> + x86_64 </td> <td valign=top align=center> <b>HOST_BUILD_TYPE</b><br/> @@ -491,42 +482,40 @@ specified here as well.</p> </tr> <tr> <td valign=top align=center> - <b>TARGET_OS</b><br/> - linux<br/> - darwin<br/> - (cygwin) - </td> - <td valign=top align=center> <b>TARGET_ARCH</b><br/> arm<br/> - x86 + arm64<br/> + mips<br/> + mips64<br/> + x86<br/> + x86_64 </td> <td valign=top align=center> <b>TARGET_BUILD_TYPE</b><br/> release<br/> debug </td> - <td valign=top align=center> - <b>TARGET_PRODUCT</b><br/> - sim<br/> - dream<br/> - sooner - </td> </tr> </table> +<p>There are also special variables to use instead of conditionals. Many of the +normal variables (LOCAL_SRC_FILES, LOCAL_CFLAGS, etc) can be conditionally added +to with _{arch} _{32|64}, and for the host, _{os}.</p> + <h4>Some Examples</h4> <pre>ifeq ($(TARGET_BUILD_TYPE),release) LOCAL_CFLAGS += -DNDEBUG=1 endif +LOCAL_CFLAGS_arm += -DTARGET_IS_ARM + +LOCAL_CFLAGS_64 += -DBIG_POINTER + # from libutils -ifeq ($(TARGET_OS),linux) # Use the futex based mutex and condition variable # implementation from android-arm because it's shared mem safe -LOCAL_SRC_FILES += futex_synchro.c -LOCAL_LDLIBS += -lrt -ldl -endif +LOCAL_SRC_FILES_linux += futex_synchro.c +LOCAL_LDLIBS_linux += -lrt -ldl </pre> @@ -554,7 +543,7 @@ LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_SBIN_UNSTRIPPED) the unstripped executables so GDB can find the symbols. <code>LOCAL_UNSTRIPPED_PATH</code> is not necessary if you only specified <code>LOCAL_MODULE_RELATIVE_PATH</code>.</p> -<p>Look in <code>config/envsetup.make</code> for all of the variables defining +<p>Look in <code>core/envsetup.mk</code> for all of the variables defining places to build things.</p> <p>FYI: If you're installing an executable to /sbin, you probably also want to set <code>LOCAL_FORCE_STATIC_EXCUTABLE := true</code> in your Android.mk, which @@ -587,6 +576,11 @@ alphabetically.</p> and definitions that are specific to either the host or the target builds. Do not set variables that start with HOST_ or TARGET_ in your makefiles. </li> + <li><b>HOST_CROSS_</b> - These contain the directories and definitions that + are specific to cross-building host binaries. The common case is building + windows host tools on linux. Do not set variables that start with + HOST_CROSS_ in your makefiles. + </li> <li><b>BUILD_</b> and <b>CLEAR_VARS</b> - These contain the names of well-defined template makefiles to include. Some examples are CLEAR_VARS and BUILD_HOST_PACKAGE.</li> @@ -773,13 +767,13 @@ LOCAL_POST_PROCESS_COMMAND := /Developer/Tools/Rez -d __DARWIN__ -t APPL\<br/> </code></p> <h4>LOCAL_PREBUILT_EXECUTABLES</h4> -<p>When including $(BUILD_PREBUILT) or $(BUILD_HOST_PREBUILT), set these to -executables that you want copied. They're located automatically into the +<p>When including $(BUILD_MULTI_PREBUILT) or $(BUILD_HOST_PREBUILT), set these +to executables that you want copied. They're located automatically into the right bin directory.</p> <h4>LOCAL_PREBUILT_LIBS</h4> -<p>When including $(BUILD_PREBUILT) or $(BUILD_HOST_PREBUILT), set these to -libraries that you want copied. They're located automatically into the +<p>When including $(BUILD_MULTI_PREBUILT) or $(BUILD_HOST_PREBUILT), set these +to libraries that you want copied. They're located automatically into the right lib directory.</p> <h4>LOCAL_SHARED_LIBRARIES</h4> @@ -836,6 +830,16 @@ set <code>LOCAL_UNSTRIPPED_PATH</code>, the unstripped binaries will also use the relative path.</p> <p>See <a href="#moving-modules">Putting modules elsewhere</a> for more.</p> +<h4>LOCAL_MODULE_HOST_OS</h4> +<p>This specifies which OSes are supported by this host module. It is not used +for target builds. The accepted values here are combinations of +<code>linux</code>, <code>darwin</code>, and <code>windows</code>. By default, +linux and darwin(MacOS) are considered to be supported. If a module should +build under windows, you must specify windows, and any others to be supported. +Some examples:</p> +<p><code>LOCAL_MODULE_HOST_OS := linux<br/> +LOCAL_MODULE_HOST_OS := darwin linux windows</code></p> + <h4>LOCAL_UNSTRIPPED_PATH</h4> <p>Instructs the build system to put the unstripped version of the module somewhere other than what's normal for its type. Usually, you override this @@ -878,10 +882,10 @@ system expects, it fails printing an error message explaining what happened. If you make a change that requires an update, you need to update two places so this message will be printed. <ul> - <li>In config/envsetup.make, increment the + <li>In core/envsetup.mk, increment the CORRECT_BUILD_ENV_SEQUENCE_NUMBER definition.</li> <li>In buildspec.mk.default, update the BUILD_ENV_SEQUENCE_DUMBER - definition to match the one in config/envsetup.make</li> + definition to match the one in core/envsetup.mk</li> </ul> The scripts automatically get the value from the build system, so they will trigger the warning as well. @@ -900,53 +904,39 @@ isn't actually built in to it, you can add those make targets to for some other dependency that isn't created automatically.</p> <h4>LOCAL_BUILT_MODULE</h4> +<p class=warning>This should not be used, since multiple binaries are now +created from a single module defintiion.</p> <p>When a module is built, the module is created in an intermediate directory then copied to its final location. LOCAL_BUILT_MODULE is the full path to the intermediate file. See LOCAL_INSTALLED_MODULE for the path to the final installed location of the module.</p> -<h4>LOCAL_HOST</h4> -<p>Set by the host_xxx.make includes to tell base_rules.make and the other -includes that we're building for the host. Kenneth did this as part of -openbinder, and I would like to clean it up so the rules, includes and -definitions aren't duplicated for host and target.</p> +<h4>LOCAL_IS_HOST_MODULE</h4> +<p>Set by the host_xxx.mk includes to tell base_rules.mk and the other +includes that we're building for the host.</p> <h4>LOCAL_INSTALLED_MODULE</h4> +<p class=warning>This should not be used, since multiple binaries are now +created from a single module defintiion.</p> <p>The fully qualified path name of the final location of the module. See LOCAL_BUILT_MODULE for the location of the intermediate file that the make rules should actually be constructing.</p> -<h4>LOCAL_REPLACE_VARS</h4> -<p>Used in some stuff remaining from the openbinder for building scripts -with particular values set,</p> - -<h4>LOCAL_SCRIPTS</h4> -<p>Used in some stuff remaining from the openbinder build system that we -might find handy some day.</p> - <h4>LOCAL_MODULE_CLASS</h4> <p>Which kind of module this is. This variable is used to construct other -variable names used to locate the modules. See base_rules.make and -envsetup.make.</p> - -<h4>LOCAL_MODULE_NAME</h4> -<p>Set to the leaf name of the LOCAL_BUILT_MODULE. I'm not sure, -but it looks like it's just used in the WHO_AM_I variable to identify -in the pretty printing what's being built.</p> +variable names used to locate the modules. See base_rules.mk and +envsetup.mk.</p> <h4>LOCAL_MODULE_SUFFIX</h4> <p>The suffix that will be appended to <code>LOCAL_MODULE</code> to form <code>LOCAL_MODULE_NAME</code>. For example, .so, .a, .dylib.</p> <h4>LOCAL_STRIP_MODULE</h4> -<p>Calculated in base_rules.make to determine if this module should actually -be stripped or not, based on whether <code>LOCAL_STRIPPABLE_MODULE</code> -is set, and whether the combo is configured to ever strip modules. With -Iliyan's stripping tool, this might change.</p> - -<h4>LOCAL_STRIPPABLE_MODULE</h4> -<p>Set by the include makefiles if that type of module is strippable. -Executables and shared libraries are.</p> +<p>If set to true (the default), the binary will be stripped and a debug +link will be set up so that GDB will still work. If set to no_debuglink, +the binary will be stripped, but no debug link will be added. If set to +keep_symbols, it will strip the debug information, but keep the symbol table. +Any other value will prevent stripping.</p> <h4>LOCAL_SYSTEM_SHARED_LIBRARIES</h4> <p>Used while building the base libraries: libc, libm, libdl. Usually |