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authorAnas Nashif <anashif@tizendev.org>2012-05-23 08:22:02 +0900
committerGerrit Code Review <gerrit2@localhost>2012-05-23 08:22:02 +0900
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+This directory contains the necessary files to port the C compiler
+``LCC'' (available by FTP from sunsite.doc.ic.ac.uk in the directory
+/computing/programming/languages/c/lcc) to compile for Linux (a.out
+or ELF) by using NASM as a back-end code generator.
+
+This patch has been tested on lcc version 3.6.
+
+To install:
+
+- Copy `x86nasm.md' into the `src' directory of the lcc tree.
+
+- Copy either `lin-elf.c' or `lin-aout.c' into the `etc' directory.
+
+- If you're installing for a.out, edit `x86nasm.md' and change the
+ conditional after the comment reading "CHANGE THIS FOR a.out" in
+ the `defsymbol' function from `#if 0' to `#if 1'.
+
+- Make the following changes to `bind.c' in the `src' directory:
+
+ - Near the top of the file, add a line that reads
+ extern Interface x86nasmIR;
+
+ - In the `bindings' array, add the lines
+ "x86-nasm", &x86nasmIR,
+ "x86/nasm", &x86nasmIR,
+ (in sensible looking places...)
+
+ A sample `bind.c' has been provided to show what the result of
+ this might look like. You might be able to get away with using it
+ directly...
+
+- Modify the lcc makefile to include rules for x86nasm.o: this will
+ have to be done in about three places. Just copy any line with
+ `x86' on it and modify it to read `x86nasm' everywhere. (Except
+ that in the list of object files that rcc is made up from, do
+ remember to ensure that every line but the last has a trailing
+ backslash...)
+
+- You may have to modify the contents of `lin-elf.c' or `lin-aout.c'
+ to reflect the true locations of files such as crt0.o, crt1.o,
+ ld-linux.so and so forth. If you don't know where to find these,
+ compile a short C program with `gcc -v' and see what command line
+ gcc feeds to `ld'.
+
+- You should now be able to build lcc, using `lin-elf.c' or
+ `lin-aout.c' as the system-dependent part of the `lcc' wrapper
+ program.
+
+- Symlink x86nasm.c into the `src' directory before attempting the
+ triple test, or the compile will fail.
+
+- Now it should pass the triple test, on either ELF or a.out. Voila!