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authorWilliam Joye <wjoye@cfa.harvard.edu>2017-05-02 16:40:01 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2017-05-02 16:40:01 (GMT)
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-There are two ways to build this code;
-
-(1) Manually
-
-(2) Using all-singing all-dancing (all-confusing) autotools, ie. autoconf,
-automake, and their little friends (autoheader, etc).
-
-=================
-Building Manually
-=================
-
-There is a basic "Makefile" in this directory that gets moved out of the way and
-ignored when building with autoconf et al. This Makefile is suitable for
-building tunala on Linux using gcc. Any other platform probably requires some
-tweaking. Here are the various bits you might need to do if you want to build
-this way and the default Makefile isn't sufficient;
-
-* Compiler: Edit the "CC" definition in Makefile
-
-* Headers, features: tunala.h controls what happens in the non-autoconf world.
- It, by default, assumes the system has *everything* (except autoconf's
- "config.h") so if a target system is missing something it must define the
- appropriate "NO_***" symbols in CFLAGS. These include;
-
- - NO_HAVE_UNISTD_H, NO_HAVE_FCNTL_H, NO_HAVE_LIMITS_H
- Indicates the compiling system doesn't have (or need) these header files.
- - NO_HAVE_STRSTR, NO_HAVE_STRTOUL
- Indicates the compiling system doesn't have these functions. Replacements
- are compiled and used in breakage.c
- - NO_HAVE_SELECT, NO_HAVE_SOCKET
- Pointless symbols - these indicate select() and/or socket() are missing in
- which case the program won't compile anyway.
-
- If you want to specify any of these, add them with "-D" prefixed to each in
- the CFLAGS definition in Makefile.
-
-* Compilation flags: edit DEBUG_FLAGS and/or CFLAGS directly to control the
- flags passed to the compiler. This can also be used to change the degree of
- optimisation.
-
-* Linker flags: some systems (eg. Solaris) require extra linker flags such as;
- -ldl, -lsocket, -lnsl, etc. If unsure, bring up the man page for whichever
- function is "undefined" when the linker fails - that usually indicates what
- you need to add. Make changes to the LINK_FLAGS symbol.
-
-* Linker command: if a different linker syntax or even a different program is
- required to link, edit the linker line directly in the "tunala:" target
- definition - it currently assumes the "CC" (compiler) program is used to link.
-
-======================
-Building Automagically
-======================
-
-Automagic building is handled courtesy of autoconf, automake, etc. There are in
-fact two steps required to build, and only the first has to be done on a system
-with these tools installed (and if I was prepared to bloat out the CVS
-repository, I could store these extra files, but I'm not).
-
-First step: "autogunk.sh"
--------------------------
-
-The "./autogunk.sh" script will call all the necessary autotool commands to
-create missing files and run automake and autoconf. The result is that a
-"./configure" script should be generated and a "Makefile.in" generated from the
-supplied "Makefile.am". NB: This script also moves the "manual" Makefile (see
-above) out of the way and calls it "Makefile.plain" - the "ungunk" script
-reverses this to leave the directory it was previously.
-
-Once "ungunk" has been run, the resulting directory should be able to build on
-other systems without autoconf, automake, or libtool. Which is what the second
-step describes;
-
-Second step: "./configure"
---------------------------
-
-The second step is to run the generated "./configure" script to create a
-config.h header for your system and to generate a "Makefile" (generated from
-"Makefile.in") tweaked to compile on your system. This is the standard sort of
-thing you see in GNU packages, for example, and the standard tricks also work.
-Eg. to override "configure"'s choice of compiler, set the CC environment
-variable prior to running configure, eg.
-
- CC=gcc ./configure
-
-would cause "gcc" to be used even if there is an otherwise preferable (to
-autoconf) native compiler on your system.
-
-After this run "make" and it should build the "tunala" executable.
-
-Notes
------
-
-- Some versions of autoconf (or automake?) generate a Makefile syntax that gives
- trouble to some "make" programs on some systems (eg. OpenBSD). If this
- happens, either build 'Manually' (see above) or use "gmake" instead of "make".
- I don't like this either but like even less the idea of sifting into all the
- script magic crud that's involved.
-
-- On a solaris system I tried, the "configure" script specified some broken
- compiler flags in the resulting Makefile that don't even get echoed to
- stdout/err when the error happens (evil!). If this happens, go into the
- generated Makefile, find the two affected targets ("%.o:" and "%.lo"), and
- remove the offending hidden option in the $(COMPILE) line all the sludge after
- the two first lines of script (ie. after the "echo" and the "COMPILE" lines).
- NB: This will probably only function if "--disable-shared" was used, otherwise
- who knows what would result ...
-