Arjan van de Ven wrote:
Subject: allow gcc4 to optimize unit-at-a-time
From: Ingo Molnar <[email protected]>
allow gcc4 compilers to optimize unit-at-a-time.
This flag enables gcc to "see" the entire C file before making optimisation
decisions such as inline, which results in gcc making better decisions. One
of the immediate effects of this is that static functions that are used only
once now get inlined.
gcc 3.4 has this flag as well, however gcc 3.x have a problem with inlining
and stacks and as a result, enabling this flag there would cause excessive
and unacceptable stack use. This problem is fixed in the gcc 4.x series.
The x86-64 architecture already enables this feature so it's well tested
already.
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Arjan van de Ven <[email protected]>
ACK, with a note: gcc also supports limited program-at-a-time -- you
pass multiple .c files on the same command line, and specify a single
output on the command line.
It would be nice to update kbuild to do this for single directory
modules....
Jeff
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