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[build] Work around bug in gcc >= 4.8
Commit 238050d ("[build] Work around bug in gcc >= 4.8") works around one instance of a bug in recent versions of gcc, in which "ebp" cannot be specified within an asm clobber list. Some versions of gcc seem to exhibit the same bug on other points in the codebase. Fix by changing all instances of "ebp" in a clobber list to use the push/pop %ebp workaround instead. Originally-implemented-by: Víctor Román Archidona <contacto@victor-roman.es> Signed-off-by: Michael Brown <mcb30@ipxe.org>
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