133 lines
3.9 KiB
Text
133 lines
3.9 KiB
Text
This is a loose collection of notes for people hacking on simulators.
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If this document gets big enough it can be prettied it up then.
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Contents
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- The "common" directory
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- Common Makefile Support
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- Generating "configure" files
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The "common" directory
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======================
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The common directory contains:
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- common documentation files (e.g. run.1, and maybe in time .texi files)
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- common source files (e.g. run.c)
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- common Makefile fragment and configury (e.g. Make-common.in, aclocal.m4).
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In addition "common" contains portions of the system call support
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(e.g. callback.c, nltvals.def).
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Even though no files are built in this directory, it is still configured
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so support for regenerating nltvals.def is present.
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Common Makefile Support
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=======================
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A common configuration framework is available for simulators that want
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to use it. The common framework exists to remove a lot of duplication
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in configure.in and Makefile.in, and it also provides a foundation for
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enhancing the simulators uniformly (e.g. the more they share in common
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the easier a feature added to one is added to all).
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The configure.in of a simulator using the common framework should look like:
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--- snip ---
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dnl Process this file with autoconf to produce a configure script.
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sinclude(../common/aclocal.m4)
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AC_PREREQ(2.5)dnl
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AC_INIT(Makefile.in)
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SIM_AC_COMMON
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... target specific additions ...
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SIM_AC_OUTPUT
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--- snip ---
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SIM_AC_COMMON:
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- invokes the autoconf macros most often used by the simulators
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- defines --enable/--with options usable by all simulators
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- initializes sim_link_files/sim_link_links as the set of symbolic links
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to set up
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SIM_AC_OUTPUT:
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- creates the symbolic links defined in sim_link_{files,links}
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- creates config.h
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- creates the Makefile
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The Makefile.in of a simulator using the common framework should look like:
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--- snip ---
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# Makefile for blah ...
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# Copyright blah ...
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## COMMON_PRE_CONFIG_FRAG
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# These variables are given default values in COMMON_PRE_CONFIG_FRAG.
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# We override the ones we need to here.
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# Not all of these need to be mentioned, only the necessary ones.
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# List of object files, less common parts.
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SIM_OBJS =
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# List of flags to always pass to $(CC).
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SIM_EXTRA_CFLAGS =
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# List of extra libraries to link with.
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SIM_EXTRA_LIBS =
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# List of extra program dependencies.
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SIM_EXTRA_LIBDEPS =
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# List of main object files for `run'.
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SIM_RUN_OBJS = run.o
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# Dependency of `all' to build any extra files.
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SIM_EXTRA_ALL =
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# Dependency of `install' to install any extra files.
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SIM_EXTRA_INSTALL =
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# Dependency of `clean' to clean any extra files.
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SIM_EXTRA_CLEAN =
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## COMMON_POST_CONFIG_FRAG
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# Rules need to build $(SIM_OBJS), plus whatever else the target wants.
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... target specific rules ...
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--- snip ---
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COMMON_{PRE,POST}_CONFIG_FRAG are markers for SIM_AC_OUTPUT to tell it
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where to insert the two pieces of common/Make-common.in.
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The resulting Makefile is created by doing autoconf substitions on
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both the target's Makefile.in and Make-common.in, and inserting
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the two pieces of Make-common.in into the target's Makefile.in at
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COMMON_{PRE,POST}_CONFIG_FRAG.
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Generating "configure" files
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============================
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For target's using the common framework, "configure" can be generated
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by running autoconf. This works because configure.in contains
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"sinclude(../common/aclocal.m4)".
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To regenerate the configure files for all targets using the common framework:
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$ cd devo/sim
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$ make -f Makefile.in autoconf-common
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To add a change-log entry to the ChangeLog file for each updated
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directory (WARNING - check the modified new-ChangeLog files before
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renaming):
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$ make -f Makefile.in autoconf-changelog
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$ more */new-ChangeLog
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$ make -f Makefile.in autoconf-install
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In a similar vein, both the configure and config.in files can be
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updated using the sequence:
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$ cd devo/sim
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$ make -f Makefile.in autoheader-common
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$ make -f Makefile.in autoheader-changelog
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$ more */new-ChangeLog
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$ make -f Makefile.in autoheader-install
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