yann@2076
|
1 |
File.........: 5 - Using the toolchain.txt
|
yann@2076
|
2 |
Copyrigth....: (C) 2010 Yann E. MORIN <yann.morin.1998@anciens.enib.fr>
|
yann@2076
|
3 |
License......: Creative Commons Attribution Share Alike (CC-by-sa), v2.5
|
yann@2076
|
4 |
|
yann@2076
|
5 |
|
yann@2076
|
6 |
Using the toolchain /
|
yann@2076
|
7 |
____________________/
|
yann@2076
|
8 |
|
yann@2076
|
9 |
|
yann@2076
|
10 |
Using the toolchain is as simple as adding the toolchain's bin directory in
|
yann@2076
|
11 |
your PATH, such as:
|
yann@2076
|
12 |
export PATH="${PATH}:/your/toolchain/path/bin"
|
yann@2076
|
13 |
|
yann@2076
|
14 |
and then using the target tuple to tell the build systems to use your
|
yann@2076
|
15 |
toolchain:
|
yann@2076
|
16 |
./configure --target=your-target-tuple
|
yann@2076
|
17 |
or
|
yann@2076
|
18 |
make CC=your-target-tuple-gcc
|
yann@2076
|
19 |
or
|
yann@2076
|
20 |
make CROSS_COMPILE=your-target-tuple-
|
yann@2076
|
21 |
and so on...
|
yann@2076
|
22 |
|
yann@2076
|
23 |
It is strongly advised not to use the toolchain sys-root directory as an
|
yann@2076
|
24 |
install directory for your programs/packages. If you do so, you will not be
|
yann@2076
|
25 |
able to use your toolchain for another project. It is even strongly advised
|
yann@2076
|
26 |
that your toolchain is chmod-ed to read-only once successfully build, so that
|
yann@2076
|
27 |
you don't go polluting your toolchain with your programs/packages' files.
|
yann@2076
|
28 |
|
yann@2076
|
29 |
Thus, when you build a program/package, install it in a separate directory,
|
yann@2076
|
30 |
eg. /your/root. This directory is the /image/ of what would be in the root file
|
yann@2076
|
31 |
system of your target, and will contain all that your programs/packages have
|
yann@2076
|
32 |
installed.
|
yann@2076
|
33 |
|
yann@2076
|
34 |
|
yann@2076
|
35 |
The 'populate' script |
|
yann@2076
|
36 |
----------------------+
|
yann@2076
|
37 |
|
yann@2076
|
38 |
When your root directory is ready, it is still missing some important bits: the
|
yann@2076
|
39 |
toolchain's libraries. To populate your root directory with those libs, just
|
yann@2076
|
40 |
run:
|
yann@2076
|
41 |
your-target-tuple-populate -s /your/root -d /your/root-populated
|
yann@2076
|
42 |
|
yann@2076
|
43 |
This will copy /your/root into /your/root-populated, and put the needed and only
|
yann@2076
|
44 |
the needed libraries there. Thus you don't polute /your/root with any cruft that
|
yann@2076
|
45 |
would no longer be needed should you have to remove stuff. /your/root always
|
yann@2076
|
46 |
contains only those things you install in it.
|
yann@2076
|
47 |
|
yann@2076
|
48 |
You can then use /your/root-populated to build up your file system image, a
|
yann@2076
|
49 |
tarball, or to NFS-mount it from your target, or whatever you need.
|
yann@2076
|
50 |
|
yann@2076
|
51 |
The populate script accepts the following options:
|
yann@2076
|
52 |
|
yann@2076
|
53 |
-s src_dir
|
yann@2076
|
54 |
Use 'src_dir' as the un-populated root directory.
|
yann@2076
|
55 |
|
yann@2076
|
56 |
-d dst_dir
|
yann@2076
|
57 |
Put the populated root directory in 'dst_dir'.
|
yann@2076
|
58 |
|
yann@2076
|
59 |
-l lib1 [...]
|
yann@2076
|
60 |
Always add specified libraries.
|
yann@2076
|
61 |
|
yann@2076
|
62 |
-L file
|
yann@2076
|
63 |
Always add libraries listed in 'file'.
|
yann@2076
|
64 |
|
yann@2076
|
65 |
-f
|
yann@2076
|
66 |
Remove 'dst_dir' if it previously existed; continue even if any library
|
yann@2076
|
67 |
specified with -l or -L is missing.
|
yann@2076
|
68 |
|
yann@2076
|
69 |
-v
|
yann@2076
|
70 |
Be verbose, and tell what's going on (you can see exactly where libs are
|
yann@2076
|
71 |
coming from).
|
yann@2076
|
72 |
|
yann@2076
|
73 |
-h
|
yann@2076
|
74 |
Print the help.
|
yann@2076
|
75 |
|
yann@2076
|
76 |
See 'your-target-tuple-populate -h' for more information on the options.
|
yann@2076
|
77 |
|
yann@2076
|
78 |
Here is how populate works:
|
yann@2076
|
79 |
|
yann@2076
|
80 |
1) performs some sanity checks:
|
yann@2076
|
81 |
- src_dir and dst_dir are specified
|
yann@2076
|
82 |
- src_dir exists
|
yann@2076
|
83 |
- unless forced, dst_dir does not exist
|
yann@2076
|
84 |
- src_dir != dst_dir
|
yann@2076
|
85 |
|
yann@2076
|
86 |
2) copy src_dir to dst_dir
|
yann@2076
|
87 |
|
yann@2076
|
88 |
3) add forced libraries to dst_dir
|
yann@2076
|
89 |
- build the list from -l and -L options
|
yann@2076
|
90 |
- get forced libraries from the sysroot (see below for heuristics)
|
yann@2076
|
91 |
- abort on the first missing library, unless -f is specified
|
yann@2076
|
92 |
|
yann@2076
|
93 |
4) add all missing libraries to dst_dir
|
yann@2076
|
94 |
- scan dst_dir for every ELF files that are 'executable' or
|
yann@2076
|
95 |
'shared object'
|
yann@2076
|
96 |
- list the "NEEDED Shared library" fields
|
yann@2076
|
97 |
- check if the library is already in dst_dir/lib or dst_dir/usr/lib
|
yann@2076
|
98 |
- if not, get the library from the sysroot
|
yann@2076
|
99 |
- if it's in sysroot/lib, copy it to dst_dir/lib
|
yann@2076
|
100 |
- if it's in sysroot/usr/lib, copy it to dst_dir/usr/lib
|
yann@2076
|
101 |
- in both cases, use the SONAME of the library to create the file
|
yann@2076
|
102 |
in dst_dir
|
yann@2076
|
103 |
- if it was not found in the sysroot, this is an error.
|