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Checkpoint lwcc development - preprocessor is runnable but nonfunctional The preprocessor is currently runnable but doesn't actually do anything useful. This is just a checkpoint.
author William Astle <lost@l-w.ca>
date Tue, 17 Sep 2013 19:33:41 -0600
parents 83bb31ca8b6a
children b0fb675d1ed4
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1 These files are extra utility type scripts that can be used for various
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2 purposes.
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3
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4 as
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6 This is a sort of front-end script that makes lwasm look approximately like
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7 gnu as which is useful for using lwasm as a backend to gcc. You may need to
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8 edit it to make it work fully.
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9
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10 ld
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12 Similar to the "as" script above except for lwlink.
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15 ar
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16
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17 Similar to the "as" script above except for lwar.
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18
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19 gcc6809lw-4.6.1-1.patch
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20
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21 These are patches to the main gcc source distribution for specific releases.
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22 The last number after the dash is a patch level for the specific patch.
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23 These are different to the official gcc6809 releases in the following ways.
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24 First, all the source for as-6809 is removed. Also, the special "helper"
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25 makefile and directory is removed. Also, as of this writing, the latest
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26 "official" release was for gcc 4.3.4 which does not build on 64 bit linux.
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28 In the event you have used the "official" gcc6809 with the default as6809
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29 assembler that comes with it, you should be aware that while lwasm is mostly
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30 compatible with it syntax wise, there are differences, particularly in
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31 pseudo operations and source line syntax (most notably that you must have
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32 whitespace preceeding assembler directives and instructions). You will
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33 likely not run into these unless you are using inline asm. Refer to the
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34 lwtools documentation for the specific line format required by lwasm.
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35
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36 It is worth noting that neither gcc6809 nor lwtools comes with a standard C
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37 library.
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38
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39 It is also worth noting that for many projects, it will be more flexible to
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40 invoke lwlink directly rather than using the ld script or gcc as a front
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41 end. See the lwtools documentation for details on using lwlink.
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43 To use these scripts, you really need to understand how to build a gcc as a
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44 cross compiler. The basics are that you put the as, ld, and ar scripts
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45 whereever you plan to put your cross-development binaries. Then, when
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46 building the cross compiler, you tell it where the scripts are.
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47
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48 Please note that the following recipe is an example only. If you are
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49 planning to install multiple instances of gcc6809 for different targets, you
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50 will most certainly need to modify the steps below. Providing a complete
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51 understanding of building a gcc toolchain for cross compilation is well
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52 beyond the scope of this document.
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53
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54 The following works for a single installation.
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56 1. Install the ar, as, and ld scripts named m6809-unknown-{as,ar,ld} in a
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57 directory in your path, say /usr/local/coco/bin/.
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59 2. Make symbolic links to /bin/true for similarly named nm, objdump, ranlib,
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60 and strip in the same directory Some of these may not be necessary.
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61
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62 3. Unpack gcc and apply the gcc6809 patch. The gcc6809lw* patch file
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63 in this directory is known to work with these instructions.
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65 4. Make sure /usr/local/coco/bin is in your PATH
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67 5. Make sure "." is NOT in your path or is at the END of PATH. If you have
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68 gazillions of errors pop up compiling "gemodes.c", this is your problem.
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70 6. In a directory (other than the gcc source, say "gcc-build" at the same
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71 level as the main gcc directory, do (assuming gcc 4.3.4):
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73 configure --enable-languages=c --target=m6809-unknown \
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74 --program-prefix=m6809-unknown- --enable-obsolete \
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75 --srcdir=../gcc-4.3.4 --disable-threads --disable-nls \
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76 --disable-libssp --prefix=/usr/local/coco \
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77 --with-as=/usr/local/coco/bin/m6809-unknown-as \
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78 --with-ld=/usr/local/coco/bin/m6809-unknown-ld \
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79 --with-ar=/usr/local/coco/bin/m6809-unknown-ar
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80
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81 NOTE: the last three are required to prevent selection of the wrong binutils
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82 programs at runtime.
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83
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84 --with-sysroot might be useful if you have a C library involved.
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85
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86 7. Run "make". If errors appear, troubleshoot.
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87
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88 8. Run "make install". Note that you will have to have your PATH variable
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89 for "root" set up correctly if your install prefix requires root privileges.
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90
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91 The above is WOMM certified. YMMV.