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authorLukas Larsson <[email protected]>2012-05-23 16:44:25 +0200
committerLukas Larsson <[email protected]>2012-07-19 12:24:40 +0200
commit6bb1cd1c9595413cdfd9a8875520e1c85e446833 (patch)
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Move README and INSTALL to HOWTO folder
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-Notes about prebuilt beam files under version control
------------------------------------------------------
-
-This information applies mostly to developers, some parts only
-to developers of the main branch i.e. Ericsson and HiPE personel.
-
-There are two types of derived code under version control, namely:
-
-primary bootstrap - Resides in the $ERL_TOP/bootstrap/{lib,bin} directories.
-preloaded code - Resides in the $ERL_TOP/erts/preloaded directory.
-
-Primary bootstrap
-.................
-
-The two types of version controlled code are fundamentally
-different. The primary bootstrap is code compiled from source files in
-the lib/{kernel,stdlib,compiler} (and header files from
-lib/orber/include. They are checked in in the version control system
-to make it possible to build directly from the code base tree without
-the need for an earlier version of the compiler. When a new version of
-OTP is released, these files are updated manually (or rather, by using
-the $ERL_TOP/otp_build script) and checked in. The files can also be
-updated due to changes in the compiler during the development
-process. The primary bootstrap is always updated as a separate
-deliberate process, never during a normal development build.
-
-If a prebuilt open source version of erlang is used, the directory
-bootstrap initially does not contain any beam files, the directory is
-instead populated by copying beam files from the
-$ERL_TOP/lib/{kernel,stdlib,compiler}/ebin directories. This
-construction is to save space in the distribution, but the result
-would be the same. Open source developers need not provide patches for
-the precompiled beam files in the primary bootstrap, the bootstrap
-update is always performed by the main developers.
-
-Preloaded code
-..............
-
-The directory $ERL_TOP/preloaded contains both src and ebin
-subdirectories. The preloaded code is compiled into the virtual
-machine and always present. When compiling the virtual machine, those
-beam files need to be present and they are considered a part of the
-virtual machine rather than a part of the kernel application. When
-preloaded files are to be updated, the source code is built using a
-special Makefile in the $ERL_TOP/preloaded/src directory, which
-creates beam files in the same directory. When they seem to compile
-successfully, they can be used in an emulator build by being copied
-to the ebin directory. otp_build update_preloaded can be used to
-ease the process (there are also similar targets in the
-$ERL_TOP/preloaded/src/Makefile).
-
-In prebuilt open source distributions, these beam files are also
-present, but to update them one might need to change permission on the
-$ERL_TOP/preloaded/ebin directory, then build and then manually copy
-the beam files from the source directory to ../ebin. If patches are
-created that involve the source files used to build preloaded code,
-always note this specially as the preloaded/ebin directory needs
-updating, or provide the new derived files in the patch or as complete
-binaries.
-
-/Patrik, OTP