Specifying optimization flags in mex

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jh2011
jh2011 2018-1-3
评论： Walter Roberson 2020-4-23
I know that -O is implemented by default when I use the mex command
mex file.cpp
However, I have two questions related to that
(1) Is -O the same as -O when compile c++ files with g++ (i.e. when I'm not using mex)
(2) How can I implement -O3 without a makefile?

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Walter Roberson
Walter Roberson 2018-1-3
"(1) Is -O the same as -O when compile c++ files with g++ (i.e. when I'm not using mex)"
Yes. However, -O for mex is treated as -O2 instead of bare -O
"(2) How can I implement -O3 without a makefile?"
Use
mex -v YourFileName.c
and look through the output for COPTIMFLAGS . Copy the flags there changing -O2 to -O3 and insert that into
mex COPTIMFLAGS="THOSE GO HERE" YourFileName.c
for example,
mex -v COPTIMFLAGS="-O3 -fwrapv -DNDEBUG" tt.c
  2 个评论
Royi Avital
Royi Avital 2020-4-23
Isn't there a dedicated command for Macros?
Walter Roberson
Walter Roberson 2020-4-23
There is a series of functions for adjusting various aspects of the toolchain, and it is plausible that you might be able to use the functions to request a copy of the current toolchain, and modify that, and save it, after which there would be a command to activate it. Or perhaps that only applies to MATLAB Compiler or Coder; I am not sure.
There is no simple command along the lines of
mexconfig optimize -O3 %does not exist

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