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Sebastien Carlier 6d8962e814 Switch from archive libraries to partial linking 
Before this commit, weak symbols were not overridden by non-weak symbols
found in archive libraries when linking with recent versions of
binutils.  As stated in the System V ABI, "the link editor does not
extract archive members to resolve undefined weak symbols".

This commit changes all Makefiles to use partial linking (ld -r) instead
of creating library archives, which forces all symbols to participate in
linking, allowing non-weak symbols to override weak symbols as intended.
This approach is also used by Linux, from which the gmake function
cmd_link_o_target (defined in config.mk and used in all Makefiles) is
inspired.

The name of each former library archive is preserved except for
extensions which change from ".a" to ".o".  This commit updates
references accordingly where needed, in particular in some linker
scripts.

This commit reveals board configurations that exclude some features but
include source files that depend these disabled features in the build,
resulting in undefined symbols.  Known such cases include:
- disabling CMD_NET but not CMD_NFS;
- enabling CONFIG_OF_LIBFDT but not CONFIG_QE.

Signed-off-by: Sebastien Carlier <sebastien.carlier@gmail.com>
2010-11-17 21:02:18 +01:00
..
fdt.c Move libfdt/ into lib/ 2010-04-13 09:13:04 +02:00
fdt_ro.c Move libfdt/ into lib/ 2010-04-13 09:13:04 +02:00
fdt_rw.c Move libfdt/ into lib/ 2010-04-13 09:13:04 +02:00
fdt_strerror.c Move libfdt/ into lib/ 2010-04-13 09:13:04 +02:00
fdt_sw.c Move libfdt/ into lib/ 2010-04-13 09:13:04 +02:00
fdt_wip.c Move libfdt/ into lib/ 2010-04-13 09:13:04 +02:00
libfdt_internal.h Move libfdt/ into lib/ 2010-04-13 09:13:04 +02:00
Makefile Switch from archive libraries to partial linking 2010-11-17 21:02:18 +01:00
README Move libfdt/ into lib/ 2010-04-13 09:13:04 +02:00

README 

The libfdt functionality was written by David Gibson.  The original
source came from the git repository:

URL:		git://ozlabs.org/home/dgibson/git/libfdt.git

author		David Gibson <dgibson@sneetch.(none)>
		Fri, 23 Mar 2007 04:16:54 +0000 (15:16 +1100)
committer	David Gibson <dgibson@sneetch.(none)>
		Fri, 23 Mar 2007 04:16:54 +0000 (15:16 +1100)
commit		857f54e79f74429af20c2b5ecc00ee98af6a3b8b
tree		2f648f0f88225a51ded452968d28b4402df8ade0
parent		07a12a08005f3b5cd9337900a6551e450c07b515

To adapt for u-boot usage, only the applicable files were copied and
imported into the u-boot git repository.
Omitted:
* GPL - u-boot comes with a copy of the GPL license
* test subdirectory - not directly useful for u-boot

After importing, other customizations were performed.  See the git log
for details.

Jerry Van Baren