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[build] Use weak definitions instead of weak declarations

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This removes the need for inline safety wrappers, marginally reducing
the size penalty of weak functions, and works around an apparent
binutils bug that causes undefined weak symbols to not actually be
NULL when compiling with -fPIE (as EFI builds do).

A bug in versions of binutils prior to 2.16 (released in 2005) will
cause same-file weak definitions to not work with those
toolchains. Update the README to reflect our new dependency on
binutils >= 2.16.

Signed-off-by: Joshua Oreman <oremanj@rwcr.net>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Joshua Oreman
2010-05-26 17:52:44 -07:00
committed by Michael Brown
parent ba27168c2e
commit 2aad3fab23
12 changed files with 48 additions and 98 deletions
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3
src/include/usr/autoboot.h
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@@ -19,7 +19,6 @@ extern int boot_next_server_and_filename ( struct in_addr next_server,
const char *filename );
extern int boot_root_path ( const char *root_path );
extern int pxe_menu_boot ( struct net_device *netdev )
__attribute__ (( weak ));
extern int pxe_menu_boot ( struct net_device *netdev );
#endif /* _USR_AUTOBOOT_H */