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diff --git a/xcomp/README.md b/xcomp/README.md index 5f4b36bdca..d08b3160ba 100644..120000 --- a/xcomp/README.md +++ b/xcomp/README.md @@ -1,555 +1 @@ -Cross Compiling Erlang/OTP -========================== - -Introduction ------------- - -This document describes how to cross compile Erlang/OTP-%OTP-REL%. Note that -the support for cross compiling Erlang/OTP should be considered as -experimental. As far as we know, the %OTP-REL% release should cross compile -fine, but since we currently have a very limited set of cross compilation -environments to test with we cannot be sure. The cross compilation support -will remain in an experimental state until we get a lot more cross compilation -environments to test with. - -You are advised to read the whole document before attempting to cross -compile Erlang/OTP. However, before reading this document, you should read -the [$ERL_TOP/INSTALL.md][] document which describes building and installing -Erlang/OTP in general. `$ERL_TOP` is the top directory in the source tree. - -### otp\_build Versus configure/make ### - -Building Erlang/OTP can be done either by using the `$ERL_TOP/otp_build` -script, or by invoking `$ERL_TOP/configure` and `make` directly. Building using -`otp_build` is easier since it involves fewer steps, but the `otp_build` build -procedure is not as flexible as the `configure`/`make` build procedure. Note -that `otp_build configure` will produce a default configuration that differs -from what `configure` will produce by default. For example, currently -`--disable-dynamic-ssl-lib` is added to the `configure` command line arguments -unless `--enable-dynamic-ssl-lib` has been explicitly passed. The binary -releases that we deliver are built using `otp_build`. The defaults used by -`otp_build configure` may change at any time without prior notice. - -### Cross Configuration ### - -The `$ERL_TOP/xcomp/erl-xcomp.conf.template` file contains all available cross -configuration variables and can be used as a template when creating a cross -compilation configuration. All [cross configuration variables][] are also -listed at the end of this document. For examples of working cross -configurations see the `$ERL_TOP/xcomp/erl-xcomp-TileraMDE2.0-tilepro.conf` -file and the `$ERL_TOP/xcomp/erl-xcomp-x86_64-saf-linux-gnu.conf` file. If the -default behavior of a variable is satisfactory, the variable does not need to -be set. However, the `configure` script will issue a warning when a default -value is used. When a variable has been set, no warning will be issued. - -A cross configuration file can be passed to `otp_build configure` using the -`--xcomp-conf` command line argument. Note that `configure` does not accept -this command line argument. When using the `configure` script directly, pass -the configuration variables as arguments to `configure` using a -`<VARIABLE>=<VALUE>` syntax. Variables can also be passed as environment -variables to `configure`. However, if you pass the configuration in the -environment, make sure to unset all of these environment variables before -invoking `make`; otherwise, the environment variables might set make variables -in some applications, or parts of some applications, and you may end up with -an erroneously configured build. - -### What can be Cross Compiled? ### - -All Erlang/OTP applications except the `wx` application can be cross compiled. -The build of the `wx` driver will currently be automatically disabled when -cross compiling. - -### Compatibility ### - -The build system, including cross compilation configuration variables used, -may be subject to non backward compatible changes without prior notice. -Current cross build system has been tested when cross compiling some Linux/GNU -systems, but has only been partly tested for more esoteric platforms. The -VxWorks example file is highly dependent on our environment and is here more -or less only for internal use. - -### Patches ### - -Please submit any patches for cross compiling in a way consistent with this -system. All input is welcome as we have a very limited set of cross compiling -environments to test with. If a new configuration variable is needed, add it -to `$ERL_TOP/xcomp/erl-xcomp.conf.template`, and use it in `configure.in`. -Other files that might need to be updated are: - -- `$ERL_TOP/xcomp/erl-xcomp-vars.sh` -- `$ERL_TOP/erl-build-tool-vars.sh` -- `$ERL_TOP/erts/aclocal.m4` -- `$ERL_TOP/xcomp/README.md` -- `$ERL_TOP/xcomp/erl-xcomp-*.conf` - -Note that this might be an incomplete list of files that need to be updated. - -General information on how to submit patches can be found at: - <http://wiki.github.com/erlang/otp/submitting-patches> - -Build and Install Procedure ---------------------------- - -If you are building in Git, you want to read the [Building in Git][] section -of [$ERL_TOP/INSTALL.md][] before proceeding. - -We will first go through the `configure`/`make` build procedure which people -probably are most familiar with. - -### Building With configure/make Directly ### - - (1) - -Change directory into the top directory of the Erlang/OTP source tree. - - $ cd $ERL_TOP - -In order to compile Erlang code, a small Erlang bootstrap system has to be -built, or an Erlang/OTP system of the same release as the one being built -has to be provided in the `$PATH`. The Erlang/OTP for the target system will -be built using this Erlang system, together with the cross compilation tools -provided. - -If you want to build the documentation out of the same source tree as you are -cross compiling in, you currently need a full Erlang/OTP system of the same -release as the one being built for the build machine. If this is the case, -build and install one for the build machine (or use one already built) and add -it to the `$PATH` before cross building, and building the documentation. See -the [How to Build the Documentation][] section in the [$ERL_TOP/INSTALL.md][] -document for information on how to build the documentation. - -If you want to build using a compatible Erlang/OTP system in the `$PATH`, -jump to (3). - -#### Building a Bootstrap System #### - - (2) - - $ ./configure --enable-bootstrap-only - $ make - -The `--enable-bootstrap-only` argument to `configure` isn't strictly necessary, -but will speed things up. It will only run `configure` in applications -necessary for the bootstrap, and will disable a lot of things not needed by -the bootstrap system. If you run `configure` without `--enable-boostrap-only` -you also have to run make as `make bootstrap`; otherwise, the whole system will -be built. - -#### Cross Building the System #### - - (3) - - $ ./configure --host=<HOST> --build=<BUILD> [Other Config Args] - $ make - -`<HOST>` is the host/target system that you build for. It does not have to be -a full `CPU-VENDOR-OS` triplet, but can be. The full `CPU-VENDOR-OS` triplet -will be created by executing `$ERL_TOP/erts/autoconf/config.sub <HOST>`. If -`config.sub` fails, you need to be more specific. - -`<BUILD>` should equal the `CPU-VENDOR-OS` triplet of the system that you -build on. If you execute `$ERL_TOP/erts/autoconf/config.guess`, it will in -most cases print the triplet you want to use for this. - -Pass the cross compilation variables as command line arguments to `configure` -using a `<VARIABLE>=<VALUE>` syntax. - -> *NOTE*: You can *not* pass a configuration file using the `--xcomp-conf` -> argument when you invoke `configure` directly. The `--xcomp-conf` argument -> can only be passed to `otp_build configure`. - -`make` will verify that the Erlang/OTP system used when building is of the -same release as the system being built, and will fail if this is not the case. -It is possible, however not recommended, to force the cross compilation even -though the wrong Erlang/OTP system is used. This by invoking `make` like this: -`make ERL_XCOMP_FORCE_DIFFERENT_OTP=yes`. - -> *WARNING*: Invoking `make ERL_XCOMP_FORCE_DIFFERENT_OTP=yes` might fail, -> silently produce suboptimal code, or silently produce erroneous code. - -#### Installing #### - -You can either install using the installation paths determined by `configure` -(4), or install manually using (5). - -##### Installing Using Paths Determined by configure ##### - - (4) - - $ make install DESTDIR=<TEMPORARY_PREFIX> - -`make install` will install at a location specified when doing `configure`. -`configure` arguments specifying where the installation should reside are for -example: `--prefix`, `--exec-prefix`, `--libdir`, `--bindir`, etc. By default -it will install under `/usr/local`. You typically do not want to install your -cross build under `/usr/local` on your build machine. Using [DESTDIR][] -will cause the installation paths to be prefixed by `$DESTDIR`. This makes it -possible to install and package the installation on the build machine without -having to place the installation in the same directory on the build machine as -it should be executed from on the target machine. - -When `make install` has finished, change directory into `$DESTDIR`, package -the system, move it to the target machine, and unpack it. Note that the -installation will only be working on the target machine at the location -determined by `configure`. - -##### Installing Manually ##### - - (5) - - $ make release RELEASE_ROOT=<RELEASE_DIR> - -`make release` will copy what you have built for the target machine to -`<RELEASE_DIR>`. The `Install` script will not be run. The content of -`<RELEASE_DIR>` is what by default ends up in `/usr/local/lib/erlang`. - -The `Install` script used when installing Erlang/OTP requires common Unix -tools such as `sed` to be present in your `$PATH`. If your target system -does not have such tools, you need to run the `Install` script on your -build machine before packaging Erlang/OTP. The `Install` script should -currently be invoked as follows in the directory where it resides -(the top directory): - - $ ./Install [-cross] [-minimal|-sasl] <ERL_ROOT> - -where: - -* `-minimal` Creates an installation that starts up a minimal amount - of applications, i.e., only `kernel` and `stdlib` are started. The - minimal system is normally enough, and is what `make install` uses. -* `-sasl` Creates an installation that also starts up the `sasl` - application. -* `-cross` For cross compilation. Informs the install script that it - is run on the build machine. -* `<ERL_ROOT>` - The absolute path to the Erlang installation to use - at run time. This is often the same as the current working directory, - but does not have to be. It can follow any other path through the file - system to the same directory. - -If neither `-minimal`, nor `-sasl` is passed as argument you will be -prompted. - -You can now either do: - - (6) - -* Decide where the installation should be located on the target machine, - run the `Install` script on the build machine, and package the installed - installation. The installation just need to be unpacked at the right - location on the target machine: - - $ cd <RELEASE_DIR> - $ ./Install -cross [-minimal|-sasl] <ABSOLUTE_INSTALL_DIR_ON_TARGET> - -or: - - (7) - -* Package the installation in `<RELEASE_DIR>`, place it wherever you want - on your target machine, and run the `Install` script on your target - machine: - - $ cd <ABSOLUTE_INSTALL_DIR_ON_TARGET> - $ ./Install [-minimal|-sasl] <ABSOLUTE_INSTALL_DIR_ON_TARGET> - -### Building With the otp\_build Script ### - - (8) - - $ cd $ERL_TOP - - (9) - - $ ./otp_build configure --xcomp-conf=<FILE> [Other Config Args] - -alternatively: - - $ ./otp_build configure --host=<HOST> --build=<BUILD> [Other Config Args] - -If you have your cross compilation configuration in a file, pass it using the -`--xcomp-conf=<FILE>` command line argument. If not, pass `--host=<HOST>`, -`--build=<BUILD>`, and the configuration variables using a `<VARIABLE>=<VALUE>` -syntax on the command line (same as in (3)). Note that `<HOST>` and `<BUILD>` -have to be passed one way or the other; either by using `erl_xcomp_host=<HOST>` -and `erl_xcomp_build=<BUILD>` in the configuration file, or by using the -`--host=<HOST>`, and `--build=<BUILD>` command line arguments. - -`otp_build configure` will configure both for the boostrap system on the -build machine and the cross host system. - - (10) - - $ ./otp_build boot -a - -`otp_build boot -a` will first build a bootstrap system for the build machine -and then do the cross build of the system. - - (11) - - $ ./otp_build release -a <RELEASE_DIR> - -`otp_build release -a` will do the same as (5), and you will after this have -to do a manual install either by doing (6), or (7). - -Testing the cross compiled system --------------------------------------- -Some of the tests that come with erlang use native code to test. This means -that when cross compiling erlang you also have to cross compile test suites -in order to run tests on the target host. To do this you first have to release -the tests as usual. - - $ make release_tests - -or - - $ ./otp_build tests - -The tests will be released into `$ERL_TOP/release/tests`. After releasing the -tests you have to install the tests on the build machine. You supply the same -xcomp file as to `./otp_build` in (9). - - $ cd $ERL_TOP/release/tests/test_server/ - $ $ERL_TOP/bootstrap/bin/erl -eval 'ts:install([{xcomp,"<FILE>"}])' -s ts compile_testcases -s init stop - -You should get a lot of printouts as the testcases are compiled. Once done you -should copy the entire `$ERL_TOP/release/tests` folder to the cross host system. - -Then go to the cross host system and setup the erlang installed in (4) or (5) -to be in your `$PATH`. Then go to what previously was -`$ERL_TOP/release/tests/test_server` and issue the following command. - - $ erl -s ts install -s ts run all_tests -s init stop - -The configure should be skipped and all tests should hopefully pass. For more -details about how to use ts run `erl -s ts help -s init stop` - -Currently Used Configuration Variables --------------------------------------- - -Note that you cannot define arbitrary variables in a cross compilation -configuration file. Only the ones listed below will be guaranteed to be -visible throughout the whole execution of all `configure` scripts. Other -variables needs to be defined as arguments to `configure` or exported in -the environment. - -### Variables for otp\_build Only ### - -Variables in this section are only used, when configuring Erlang/OTP for -cross compilation using `$ERL_TOP/otp_build configure`. - -> *NOTE*: These variables currently have *no* effect if you configure using -> the `configure` script directly. - -* `erl_xcomp_build` - The build system used. This value will be passed as - `--build=$erl_xcomp_build` argument to the `configure` script. It does - not have to be a full `CPU-VENDOR-OS` triplet, but can be. The full - `CPU-VENDOR-OS` triplet will be created by - `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_build`. If set to `guess`, - the build system will be guessed using - `$ERL_TOP/erts/autoconf/config.guess`. - -* `erl_xcomp_host` - Cross host/target system to build for. This value will - be passed as `--host=$erl_xcomp_host` argument to the `configure` script. - It does not have to be a full `CPU-VENDOR-OS` triplet, but can be. The - full `CPU-VENDOR-OS` triplet will be created by - `$ERL_TOP/erts/autoconf/config.sub $erl_xcomp_host`. - -* `erl_xcomp_configure_flags` - Extra configure flags to pass to the - `configure` script. - -### Cross Compiler and Other Tools ### - -If the cross compilation tools are prefixed by `<HOST>-` you probably do -not need to set these variables (where `<HOST>` is what has been passed as -`--host=<HOST>` argument to `configure`). - -All variables in this section can also be used when native compiling. - -* `CC` - C compiler. - -* `CFLAGS` - C compiler flags. - -* `STATIC_CFLAGS` - Static C compiler flags. - -* `CFLAG_RUNTIME_LIBRARY_PATH` - This flag should set runtime library - search path for the shared libraries. Note that this actually is a - linker flag, but it needs to be passed via the compiler. - -* `CPP` - C pre-processor. - -* `CPPFLAGS` - C pre-processor flags. - -* `CXX` - C++ compiler. - -* `CXXFLAGS` - C++ compiler flags. - -* `LD` - Linker. - -* `LDFLAGS` - Linker flags. - -* `LIBS` - Libraries. - -#### Dynamic Erlang Driver Linking #### - -> *NOTE*: Either set all or none of the `DED_LD*` variables. - -* `DED_LD` - Linker for Dynamically loaded Erlang Drivers. - -* `DED_LDFLAGS` - Linker flags to use with `DED_LD`. - -* `DED_LD_FLAG_RUNTIME_LIBRARY_PATH` - This flag should set runtime library - search path for shared libraries when linking with `DED_LD`. - -#### Large File Support #### - -> *NOTE*: Either set all or none of the `LFS_*` variables. - -* `LFS_CFLAGS` - Large file support C compiler flags. - -* `LFS_LDFLAGS` - Large file support linker flags. - -* `LFS_LIBS` - Large file support libraries. - -#### Other Tools #### - -* `RANLIB` - `ranlib` archive index tool. - -* `AR` - `ar` archiving tool. - -* `GETCONF` - `getconf` system configuration inspection tool. `getconf` is - currently used for finding out large file support flags to use, and - on Linux systems for finding out if we have an NPTL thread library or - not. - -### Cross System Root Locations ### - -* `erl_xcomp_sysroot` - The absolute path to the system root of the cross - compilation environment. Currently, the `crypto`, `odbc`, `ssh` and - `ssl` applications need the system root. These applications will be - skipped if the system root has not been set. The system root might be - needed for other things too. If this is the case and the system root - has not been set, `configure` will fail and request you to set it. - -* `erl_xcomp_isysroot` - The absolute path to the system root for includes - of the cross compilation environment. If not set, this value defaults - to `$erl_xcomp_sysroot`, i.e., only set this value if the include system - root path is not the same as the system root path. - -### Optional Feature, and Bug Tests ### - -These tests cannot (always) be done automatically when cross compiling. You -usually do not need to set these variables. - -> *WARNING*: Setting these variables wrong may cause hard to detect -> runtime errors. If you need to change these values, *really* make sure -> that the values are correct. - -> *NOTE*: Some of these values will override results of tests performed -> by `configure`, and some will not be used until `configure` is sure that -> it cannot figure the result out. - -The `configure` script will issue a warning when a default value is used. -When a variable has been set, no warning will be issued. - -* `erl_xcomp_after_morecore_hook` - `yes|no`. Defaults to `no`. If `yes`, - the target system must have a working `__after_morecore_hook` that can be - used for tracking used `malloc()` implementations core memory usage. - This is currently only used by unsupported features. - -* `erl_xcomp_bigendian` - `yes|no`. No default. If `yes`, the target system - must be big endian. If `no`, little endian. This can often be - automatically detected, but not always. If not automatically detected, - `configure` will fail unless this variable is set. Since no default - value is used, `configure` will try to figure this out automatically. - -* `erl_xcomp_clock_gettime_cpu_time` - `yes|no`. Defaults to `no`. If `yes`, - the target system must have a working `clock_gettime()` implementation - that can be used for retrieving process CPU time. - -* `erl_xcomp_getaddrinfo` - `yes|no`. Defaults to `no`. If `yes`, the target - system must have a working `getaddrinfo()` implementation that can - handle both IPv4 and IPv6. - -* `erl_xcomp_gethrvtime_procfs_ioctl` - `yes|no`. Defaults to `no`. If `yes`, - the target system must have a working `gethrvtime()` implementation and - is used with procfs `ioctl()`. - -* `erl_xcomp_dlsym_brk_wrappers` - `yes|no`. Defaults to `no`. If `yes`, the - target system must have a working `dlsym(RTLD_NEXT, <S>)` implementation - that can be used on `brk` and `sbrk` symbols used by the `malloc()` - implementation in use, and by this track the `malloc()` implementations - core memory usage. This is currently only used by unsupported features. - -* `erl_xcomp_kqueue` - `yes|no`. Defaults to `no`. If `yes`, the target - system must have a working `kqueue()` implementation that returns a file - descriptor which can be used by `poll()` and/or `select()`. If `no` and - the target system has not got `epoll()` or `/dev/poll`, the kernel-poll - feature will be disabled. - -* `erl_xcomp_linux_clock_gettime_correction` - `yes|no`. Defaults to `yes` on - Linux; otherwise, `no`. If `yes`, `clock_gettime(CLOCK_MONOTONIC, _)` on - the target system must work. This variable is recommended to be set to - `no` on Linux systems with kernel versions less than 2.6. - -* `erl_xcomp_linux_nptl` - `yes|no`. Defaults to `yes` on Linux; otherwise, - `no`. If `yes`, the target system must have NPTL (Native POSIX Thread - Library). Older Linux systems have LinuxThreads instead of NPTL (Linux - kernel versions typically less than 2.6). - -* `erl_xcomp_linux_usable_sigaltstack` - `yes|no`. Defaults to `yes` on Linux; - otherwise, `no`. If `yes`, `sigaltstack()` must be usable on the target - system. `sigaltstack()` on Linux kernel versions less than 2.4 are - broken. - -* `erl_xcomp_linux_usable_sigusrx` - `yes|no`. Defaults to `yes`. If `yes`, - the `SIGUSR1` and `SIGUSR2` signals must be usable by the ERTS. Old - LinuxThreads thread libraries (Linux kernel versions typically less than - 2.2) used these signals and made them unusable by the ERTS. - -* `erl_xcomp_poll` - `yes|no`. Defaults to `no` on Darwin/MacOSX; otherwise, - `yes`. If `yes`, the target system must have a working `poll()` - implementation that also can handle devices. If `no`, `select()` will be - used instead of `poll()`. - -* `erl_xcomp_putenv_copy` - `yes|no`. Defaults to `no`. If `yes`, the target - system must have a `putenv()` implementation that stores a copy of the - key/value pair. - -* `erl_xcomp_reliable_fpe` - `yes|no`. Defaults to `no`. If `yes`, the target - system must have reliable floating point exceptions. - -Copyright and License ---------------------- - -%CopyrightBegin% - -Copyright Ericsson AB 2009-2010. All Rights Reserved. - -The contents of this file are subject to the Erlang Public License, -Version 1.1, (the "License"); you may not use this file except in -compliance with the License. You should have received a copy of the -Erlang Public License along with this software. If not, it can be -retrieved online at http://www.erlang.org/. - -Software distributed under the License is distributed on an "AS IS" -basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See -the License for the specific language governing rights and limitations -under the License. - -%CopyrightEnd% - -Modifying This Document ------------------------ - -Before modifying this document you need to have a look at the -`$ERL_TOP/README.md.txt` document. - - - - [$ERL_TOP/INSTALL.md]: INSTALL - [Building in Git]: INSTALL#How-to-Build-and-Install-ErlangOTP_Building-in-Git - [How to Build the Documentation]: INSTALL#The-ErlangOTP-Documentation_How-to-Build-the-Documentation - [cross configuration variables]: #Currently-Used-Configuration-Variables - [DESTDIR]: http://www.gnu.org/prep/standards/html_node/DESTDIR.html - - [?TOC]: true +../HOWTO/INSTALL-CROSS.md
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