Initial Spring 2016 commit.
This commit is contained in:
Geoffrey Challen
476
mk/os161.config.mk
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476
mk/os161.config.mk
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#
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# OS/161 build environment base definitions
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#
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# Proper usage:
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# TOP=../.. # or however many levels needed
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# .include "$(TOP)/mk/os161.config.mk"
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#
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# This file takes care of including $(TOP)/defs.mk and sets defaults
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# for things that can be defined there.
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#
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# It and defs.mk collaboratively set various make variables that
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# control the build environment.
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#
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############################################################
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#
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# These build variables are meant to be user-settable:
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#
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# (Locations.)
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#
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# OSTREE The root directory you run OS/161 in.
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# Default is ~/os161/root.
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#
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# WORKDIR Top of a tree to use for compiling.
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# Default is $(TOP)/build.
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#
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# BUILDSYMLINKS If set to "yes", symlinks in each directory
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# will be made to point into $(BUILDTOP).
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# Default is "yes".
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#
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# By default the system will be built within the source tree and
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# installed to ~/os161/root. It is expected this will be sufficient
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# for most uses. If your root directory is somewhere else, set OSTREE
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# in defs.mk. If you're running on a large computing cluster with
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# networked home directories, setting WORKDIR to point somewhere on a
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# local disk will probably make your builds quite a bit faster, at the
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# cost of having to recompile if you switch to a different machine.
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# If you want the source tree to be completely read-only, which is
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# occasionally useful for tracking down build glitches, you can set
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# WORKDIR and also set BUILDSYMLINKS to no.
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#
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# (Platform.)
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#
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# PLATFORM The type of system we're building for.
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# Should always be set by defs.mk.
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#
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# MACHINE The processor type we're building for.
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# Should always be set by defs.mk.
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#
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# The target machine type is set when you configure the source tree.
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# If you change it, be sure to make distclean and recompile everything.
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# Not all possible combinations of PLATFORM and MACHINE are allowed.
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# See the logic at the bottom of this file for a list of supported
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# combinations. If you are trying to port OS/161 to a new machine, the
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# first step is to update that list.
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#
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# (Compilation.)
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#
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# DEBUG Compiler option for debug vs. optimize.
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# Default: -O2
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#
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# WARNINGS Compiler options for warnings.
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# Default: -Wall -Wextra -Wwrite-strings
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# -Wmissing-prototypes
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#
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# WERROR Compiler option to make warnings fatal.
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# Default: -Werror
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#
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# Since debugging of user-level programs is not supported in OS/161
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# (and not really supportable without a lot of work on your part)
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# there's usually not much reason to change DEBUG. If you want to,
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# however, the easiest way is to usually set it on the make command
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# line:
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# make clean
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# make DEBUG=-g all
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# recompiles the current directory with debug info.
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#
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# Similarly, if you have a lot of warnings and you want to temporarily
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# ignore them while you fix more serious problems, you can turn off
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# the error-on-warning behavior on the fly by setting WERROR to empty:
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# make WERROR=
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#
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# This convenience is why these variables are separately defined
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# rather than just being rolled into CFLAGS.
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#
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############################################################
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#
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# These build variables can be set explicitly for further control if
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# desired, but should in general not need attention.
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#
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# (Locations.)
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#
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# BUILDTOP Top of tree where .o files go.
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# Default is $(WORKDIR).
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#
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# TOOLDIR Place for compiled programs used in
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# the build. Default is $(WORKDIR)/tooldir.
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#
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# INSTALLTOP Staging directory for installation.
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# Default is $(WORKDIR)/install
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#
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# Probably the only reason to change these would be if you're short on
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# diskspace in $(WORKDIR).
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#
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# (Platform.)
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#
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# GNUTARGET The GNU gcc/binutils name for the
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# target we're building for.
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# Defaults to $(MACHINE)-harvard-os161.
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#
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# This should not need to be changed.
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#
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# (Programs.)
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#
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# CC (Cross-)compiler.
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# Default is $(GNUTARGET)-gcc.
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#
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# LDCC (Cross-)compiler when invoked for linking.
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# Default is $(CC).
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#
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# AS (Cross-)assembler.
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# Default is $(GNUTARGET)-as.
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#
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# LD (Cross-)linker.
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# Default is $(GNUTARGET)-ld.
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#
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# AR Archiver (librarian).
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# Default is $(GNUTARGET)-ar.
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#
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# RANLIB Library postprocessor/indexer.
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# Default is $(GNUTARGET)-ranlib.
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#
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# NM Tool to print symbol tables.
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# Default is $(GNUTARGET)-nm.
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#
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# SIZE Tool to print sizes of binaries.
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# Default is $(GNUTARGET)-size.
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#
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# STRIP Tool to remove debugging information.
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# Default is $(GNUTARGET)-strip.
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#
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# The above are the compilation tools for OS/161. They create programs
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# that run on OS/161. Since OS/161 is not meant to be self-hosting,
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# programs that we need to run during the build, or run manually
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# outside of the machine simulator, need to be compiled with a
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# different compiler that creates programs that run for the "host" OS,
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# whatever that is (Linux, NetBSD, FreeBSD, MacOS X, Solaris, etc.)
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# The host compilation tools are prefixed with HOST_ as follows:
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#
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#
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# HOST_CC Host compiler.
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# Default is gcc.
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#
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# HOST_LDCC Host compiler when invoked for linking.
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# Default is $(HOST_CC).
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#
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# HOST_AS Host assembler.
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# Default is as.
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#
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# HOST_LD Host linker.
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# Default is ld.
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#
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# HOST_AR Host archiver (librarian).
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# Default is ar.
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#
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# HOST_RANLIB Host library postprocessor/indexer.
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# Default is ranlib.
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#
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# HOST_NM Host tool to print symbol tables.
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# Default is nm.
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#
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# HOST_SIZE Host tool to print sizes of binaries.
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# Default is size.
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#
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# HOST_STRIP Host tool to remove debugging information.
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# Default is strip.
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#
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# In general there should be no need to change the cross-compiler
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# variables, unless you are e.g. trying to build OS/161 with something
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# other than gcc, or you want to supply an explicit location for a
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# specific copy of gcc somewhere rather than use the one on your
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# $PATH.
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#
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# However, on some systems it might conceivably be necessary to change
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# the host tool variables. For example, there are some (now extremely
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# old) systems where "ranlib" is not only not needed but also corrupts
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# libraries, in which case you might set HOST_RANLIB=true. If your
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# host machine doesn't have "gcc" you may be able to set HOST_CC=cc
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# and fiddle with HOST_WARNINGS and HOST_CFLAGS (below) and have
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# things still more or less work.
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#
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# (Compilation.)
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#
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# HOST_DEBUG Like DEBUG, but for programs to be
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# built to run on the host OS.
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# Default is $(DEBUG).
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#
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# HOST_WARNINGS Like WARNINGS, but for programs to be
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# built to run on the host OS.
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# Default is $(WARNINGS).
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#
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# HOST_WERROR Like WERROR, but for programs to be
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# built to run on the host OS.
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# Default is $(WERROR).
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#
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############################################################
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#
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# These build variables should probably not be tinkered with in
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# defs.mk and serve as baseline values to be added to by individual
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# program makefiles and used by other os161.*.mk files.
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#
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# (Compilation.)
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#
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# CFLAGS Full baseline compile flags.
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# Default is $(DEBUG) $(WARNINGS) $(WERROR),
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# plus what's needed for -nostdinc.
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#
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# KCFLAGS Like CFLAGS, but for the kernel, which
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# configures debug/optimize separately.
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# Default is $(KDEBUG) $(WARNINGS) $(WERROR).
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# (KDEBUG is set by the kernel config script.)
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#
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# HOST_CFLAGS Like CFLAGS, but for programs to be
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# built to run on the host OS. Default is
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# $(HOST_DEBUG) $(HOST_WARNINGS) $(HOST_WERROR).
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#
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# LDFLAGS Baseline link-time flags.
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# Default is empty plus what's needed for
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# -nostdlib.
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#
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# KLDFLAGS Baseline link-time flags for kernel.
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# Default is empty.
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#
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# HOST_LDFLAGS Like LDFLAGS, but for programs to be
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# built to run on the host OS.
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# Default is empty.
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#
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# LIBS Baseline list of libraries to link to.
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# Default is empty plus what's needed for
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# -nostdlib.
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#
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# HOST_LIBS Like LIBS, but for programs to be
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# built to run on the host OS.
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# Default is empty.
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#
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############################################################
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#
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# These variables should not be changed directly, or by individual
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# program makefiles either, and are for use by other os161.*.mk files.
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#
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# (Locations.)
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#
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# MYDIR Name of current source directory, relative
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# to $(TOP); e.g. bin/sh.
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#
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# MYBUILDDIR Build directory for current source directory.
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#
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# MKDIRS Directories to create, mostly for installing.
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#
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# ABSTOP_PATTERN, ABSTOP Private, used to compute other locations.
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#
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# (Compilation.)
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#
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# MORECFLAGS Same as CFLAGS but comes later on the
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# compile command line. In general individual
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# makefiles shouldn't touch this.
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# Default is empty plus what's needed for
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# -nostdinc.
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#
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# MORELIBS Same as LIBS but comes after on the link
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# line. In general individual makefiles
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# shouldn't touch this.
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# Default is empty plus what's needed for
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# -nostdlib.
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#
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############################################################
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# Some further vars that currently exist but should be moved
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# around elsewhere:
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#
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# COMPAT_CFLAGS
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# COMPAT_TARGETS
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############################################################
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# Establish defaults.
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# (Variables are set in the order documented above.)
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#
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# These definitions are set firmly here (that is, not with ?=) because
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# some of them, like CC, are predefined by make. Because defs.mk is
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# included afterwards it can override any of these settings.
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#
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#
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# User-settable configuration
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#
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# Locations of things.
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OSTREE=$(HOME)/os161/root # Root directory to install into.
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WORKDIR=$(TOP)/build # Top of tree to build into.
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BUILDSYMLINKS=yes # yes => link build -> $(BUILDTOP)/$(HERE).
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# Platform we're building for.
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PLATFORM=sys161
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MACHINE=mips
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# Compilation
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DEBUG=-O2
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WARNINGS=-Wall -W -Wwrite-strings -Wmissing-prototypes
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WERROR=-Werror
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#
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# Less-likely-to-need-setting
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#
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# Locations of things.
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BUILDTOP=$(WORKDIR) # Top of directory for compiler output.
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TOOLDIR=$(WORKDIR)/tooldir # Place for host progs used in the build.
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INSTALLTOP=$(WORKDIR)/install # Staging area for installation.
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# Platform.
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GNUTARGET=$(MACHINE)-harvard-os161
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# Programs and tools.
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CC=$(GNUTARGET)-gcc # Compiler.
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LDCC=$(CC) # Compiler when used for linking.
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AS=$(GNUTARGET)-as # Assembler.
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LD=$(GNUTARGET)-ld # Linker.
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AR=$(GNUTARGET)-ar # Archiver.
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RANLIB=$(GNUTARGET)-ranlib # Library indexer.
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NM=$(GNUTARGET)-nm # Symbol dumper.
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SIZE=$(GNUTARGET)-size # Size tool.
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STRIP=$(GNUTARGET)-strip # Debug strip tool.
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HOST_CC=gcc # Host compiler.
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HOST_LDCC=$(HOST_CC) # Host compiler when used for linking.
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HOST_AS=as # Host assembler.
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HOST_LD=ld # Host linker.
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HOST_AR=ar # Host archiver.
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HOST_RANLIB=ranlib # Host library indexer.
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HOST_NM=nm # Host symbol dumper.
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HOST_SIZE=size # Host size tool.
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HOST_STRIP=strip # Host debug strip tool.
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# Compilation.
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HOST_DEBUG=$(DEBUG)
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HOST_WARNINGS=$(WARNINGS)
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HOST_WERROR=$(WERROR)
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#
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# Probably-shouldn't-be-touched
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#
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CFLAGS=$(DEBUG) $(WARNINGS) $(WERROR) -std=gnu99
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KCFLAGS=$(KDEBUG) $(WARNINGS) $(WERROR) -std=gnu99
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HOST_CFLAGS=$(HOST_DEBUG) $(HOST_WARNINGS) $(HOST_WERROR) \
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-I$(INSTALLTOP)/hostinclude
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LDFLAGS=
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KLDFLAGS=
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HOST_LDFLAGS=
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LIBS=
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HOST_LIBS=
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#
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# Don't touch.
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#
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MORECFLAGS=
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MORELIBS=
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# lib/hostcompat.
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COMPAT_CFLAGS=
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COMPAT_TARGETS=
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############################################################
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# Get defs.mk to get the real configuration for this tree.
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# If it doesn't exist, we'll go with the defaults.
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.-include "$(TOP)/defs.mk"
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############################################################
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# Make sure we have a supported PLATFORM and MACHINE.
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# We support mips on system/161.
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SUPPORTED_TARGETS=sys161 mips
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_OK_=0
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.for _P_ _M_ in $(SUPPORTED_TARGETS)
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.if "$(PLATFORM)" == "$(_P_)" && "$(MACHINE)" == "$(_M_)"
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_OK_=1
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.endif
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.endfor
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.if "$(_OK_)" != "1"
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.init:
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@echo "Platform $(PLATFORM) and machine $(MACHINE) not supported"
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@false
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.endif
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############################################################
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# Get any machine-dependent flags or makefile definitions
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.-include "$(TOP)/mk/os161.config-$(MACHINE).mk"
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############################################################
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# Establish some derived locations.
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#
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# Absolute location of the top of the source tree. This should only be
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# used to un-absolutize other paths; the tree ought to be independent
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# of where it happens to live.
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#
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# This works by turning $(TOP) into a regexp and substituting it into
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# the current directory. Note that it doesn't escape all regexp
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# metacharacters -- if you make a directory named "foo*bar" or
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# something you deserve the consequences.
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#
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# .CURDIR is a make builtin.
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#
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ABSTOP_PATTERN=$(TOP:S/./\\./g:S/\\.\\./[^\/]*/g)
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ABSTOP=$(.CURDIR:C/$(ABSTOP_PATTERN)\$//)
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# Find the name of the current directory relative to TOP.
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# This works by removing ABSTOP from the front of .CURDIR.
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MYDIR=$(.CURDIR:S/^$(ABSTOP)//)
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# Find the build directory corresponding to the current source dir.
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.if "$(MYDIR)" == ""
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# avoid stray slash
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MYBUILDDIR=$(BUILDTOP)
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.else
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MYBUILDDIR=$(BUILDTOP)/$(MYDIR)
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.endif
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############################################################
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# Ensure we compile a consistent tree.
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#
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||||
# Traditionally in Unix the first step of recompiling the system is to
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# install new header files. Furthermore, the second step is to compile
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||||
# and install new libraries, before continuing on to the rest of the
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# OS, which can then be compiled with those new headers and new
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# libraries.
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#
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# Combining the compile and install phases like this is simpler and
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||||
# uses less disk space on extra copies of things (which mattered, back
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# in the day) but has a number of problems. Chief among these is that
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# if the build bombs out halfway through you end up with a partly
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||||
# updated and maybe broken system. It also means that once you start
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# recompiling the system you can't easily back out. And the behavior
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# violates the principle of least surprise.
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#
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# OS/161 1.x had, intentionally, a very traditional build environment.
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# In OS/161 2.x, however, we use a staging area to avoid mixing build
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# and install. This means that we must compile only against the
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# staging area, $(INSTALLTOP), and never use the headers or libraries
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# installed in $(OSTREE) until install time.
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#
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||||
# This means that regardless of whether we have a gcc configured so it
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# includes from our $(OSTREE) by default or not, we must use -nostdinc
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# and -nostdlib and explicitly link with materials from $(INSTALLTOP).
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||||
#
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# Use MORECFLAGS and MORELIBS, which are supported by os161.compile.mk
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||||
# for this purpose, so the include paths and library list come out in
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||||
# the right order.
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||||
#
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||||
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CFLAGS+=-nostdinc
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MORECFLAGS+=-I$(INSTALLTOP)/include
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LDFLAGS+=-nostdlib -L$(INSTALLTOP)/lib $(INSTALLTOP)/lib/crt0.o
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MORELIBS+=-lc
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LIBDEPS+=$(INSTALLTOP)/lib/crt0.o $(INSTALLTOP)/lib/libc.a
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############################################################
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||||
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||||
# end.
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||||
Reference in New Issue
Block a user