Optimization when building library from source

[drtimes]

When I build OpenJPEG 2.1.1 from source using cmake (cmake 2.8.12.2, gcc 4.8.4, Ubuntu 14.04), I get execution time of decoding that is almost three times slower than that of the prebuilt library. So to accomplish speed of the prebuilt library I have to add -O3 optimization flag manually: set(CMAKE_C_FLAGS "-O3")

What compiler and optimization did you use to build library in release 2.1.1? Why not add optimization into the cmake lists?

[boxerab]

set CMAKE_BUILD_TYPE to Release
Default is Debug i.e. no optimizations

[boxerab]

Also, the appropriate place for this type of discussion is the Google discussion group:
https://groups.google.com/forum/#!forum/openjpeg