[pcre-dev] [Bug 1222] Test failures on powerpc-darwin8
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|David Fang at|
|Philip Hazel at|
from man page: -O1 Optimize. Optimizing compilation takes somewhat more time, and a lot more memory for a large function.
With -O, the compiler tries to reduce code size and execution time, without performing any optimizations that take a great deal of com- pilation time.
-O turns on the following optimization flags: -fdefer-pop -fde- layed-branch -fguess-branch-probability -fcprop-registers -floop-optimize -fif-conversion -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename -ftree-fre -ftree-ch -fmerge-constants
-O also turns on -fomit-frame-pointer on machines where doing so does not interfere with debugging.
-O doesn't turn on -ftree-sra for the Ada compiler. This option must be explicitly specified on the command line to be enabled for the Ada compiler.
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