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114 lines
4.1 KiB
Plaintext
114 lines
4.1 KiB
Plaintext
*** GOALS
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the goals of the new configure was to
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1. make it easier to add new platforms/front ends.
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2. allow building objects in a director other than
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the source repository, so it is easy to have several
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builds for a single platform, each being built with
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different options.
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3. make dependencies explicit.
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*** CONFIGURING
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to configure a build directory, do:
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/.../executor/util/configure.sh [options]
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where options include:
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--cflags='flags'; where flags are the default cflags to be used when
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building object files for the target
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--root='dir'; where dir is the path to the executor source tree, in
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this case `/.../executor', this defaults to `...'. `${root}' will
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denote this directory for the rest of this document.
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--target='target'; where target is the gnu-style tuple describing the
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target to build executor for. the build system assumes the toolchain
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for this target can be invoked in the form `<target>-<tool>', ie.,
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`i486-next-ns3-gcc'.
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*** TARGETS
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we have a number of aliases for various targets (ie., cliff build
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binutils with a `i486-go32-bsd' configuration to cross compile to dos.
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cotton configured a newer version as `i386-msdos-go32'. there are
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equal differences in the configuration for other platforms).
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therefore, this target is `canonicalized' to yield the target name for
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selecting various configuration files and syn68k versions. currently
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three canonical configurations are supported (see the case statement
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in util/configure.sh).
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m68k-next-ns3, i486-next-ns3 for nextstep hosts running on black or
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white hardware, respectively. since they are configured `ns3', it
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assumed executor is backwards compatible with earlier versions, or we
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just don't care about that.
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i386-msdos-go32; for dos.
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a target configuration, found in ${root}/targets/<target>, has to parts.
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<target>.h; the configuration header file, and
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<target>.make; a make configuration file.
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currently, configure tests <target>.h to see if it defines `SYN68K',
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in which case it configures the target to build with syn68k (adds
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-DSYN68K to the `DEFINES' make variable, and sets the make variable
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`LIBSYN68K' to point to the appropriate syn68k library for the
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target). ultimately, putting `-DSYN68K' on the command line should be
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unecessary, as all relevent files should include the target and front
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end configuration header files.
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target.make (if it exists) is included in Makefile.in when
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configuring. it can perform any target-depend make operations it
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wants. currently, the build system uses the following make
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variables which <target>.make can define:
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LOWGLOBAL_LD_OPTION
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TARGET_LIBS
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TARGET_POST_LD_CMD, TARGET_POST_LD_OPTIONS
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*** THE FRONT END
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the target describes what type of os/hardware executor will run on,
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the front-end determines what kind of input/output api executor will
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have to interface to. there are three such front-ends (with more to
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be added later, i'm sure).
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x; for x.
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nextstep; for NeXTstep, and
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dos; for vga/dos
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each front end has a `<front-end>.make' file which is included in
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Makefile.in druing configure. this makefile fragment includes
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everything needed to build front-end specific things.
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Makefile.in uses the following make variabes which the front end
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makefile fragment can define:
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FRONT_END_DEFINES
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FRONT_END_LIBS
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FRONT_END_OBJ
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*** Makefile.in
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Makefile.in is the main skeleton which configure.sh processes (via sed
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placements to tokens of the form `@foo@') to create the Makefile in
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the build directory.
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currently the following tokens are replaced
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@target@; the canonicalized target name
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@target_make@; the text of the target makefile fragment
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@target_gcc@; the name of the gnu c compiler targetting
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the target.
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@front_end@; the name of the front end
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@root@; the path to the root directory.
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@syn68k_define@; any syn68k-specific defines, currently just
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`-DSYN68K', empty if the target does not use the synthetic cpu.
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@syn68k_lib@; the path to the syn68k library for this
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target. empty if the target does not use the synthetic cpu.
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@cflags@; default cflags to be used when compiling object
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files for the target.
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currently we include $(ROMLIB_DIR)/romlib.make and
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$(EXECUTOR_DIR)/executor.make. these should proably be included as
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well, for consistency.
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