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authorMatt Fleming <matt.fleming@intel.com>2012-07-12 17:39:53 +0100
committerMatt Fleming <matt.fleming@intel.com>2012-07-20 10:20:18 +0100
commit373a42433c4bea38d4d93ee749bd4d7f19bded51 (patch)
tree3a5c905b995521ce8279058f6216d7a1f157bece /com32/cmenu
parentb93e6bc9bdafc9fa2dc8709dc97fa5e598c7e94d (diff)
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lib/sys/module: Add support for weak symbols
We need a means of allowing Syslinux derivative-specific functions to remain unresolved when there is no implementation for them. For example, unload_pxe() is referenced by common code in com32/lib, but is only implemented for PXELINUX. By marking unload_pxe() as __weak we can substitute references with the undefined_symbol() function for SYSLINUX, EXTLINUX and ISOLINUX. Provided that those references are never executed everything works fine. However, if code calls actually calls unload_pxe() from SYSLINUX, EXTLINUX or ISOLINUX an error message is displayed and execution is halted. Signed-off-by: Matt Fleming <matt.fleming@intel.com>
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