- Codeblocks compiler optimization flags manual#
- Codeblocks compiler optimization flags 64 bits#
- Codeblocks compiler optimization flags code#
The 123s choices are sensible groupings for most. Though that's probably for "power users".
Codeblocks compiler optimization flags manual#
User manual here:Īs you'll read there the -O n/-Os choices are really nothing more than a grouping of 10's of -f xxxx options, so if you want even more control you could build your own optimisation by some combination of -O x and -f xxx selections. Of course the final release choice between -Os and -O3 kind of depends on the way in which you want it optimised (size or speed). If you pick -O0 to debug because "it's easy" then you will end up debugging something that is quite unlike the -O1.3/s that you eventually release.ĪS7 (since I told them back at the AS5 stage) now uses -O1 (not -O0) for "Debug" and -Os for "Release", these are probably sensible choices until -Og is more easily available as a choice for "Debug".
Codeblocks compiler optimization flags code#
Loads of things (timed stuff) won't work if you build -O0 because the code is so slow and bloated it won't meet the timing requirements. It is simply there as a test mode for the compiler developers so they can see the dreadful code that is fed into the optimiser. To override the cmake defaults (if needed), you can reset the build related-variables like CMAKE_CXX_FLAGS_RELEASE.Never, ever, ever use -O0. It would be better to let cmake control the optimization flags using CMAKE_BUILD_TYPE and not add them to CMAKE_FLAGS. usr/projects/hpcsoft/toss3/grizzly/openmpi/2.1.2-intel-18.0.5/bin/mpicc -DMIN_NP=128 -DUSE_V4_AVX2 -DUSE_V8_AVX2 -DVPIC_USE_LEGACY_SORT -DVPIC_USE_PTHREADS -I/users/ccranor/src/vpic -g -O3 -inline-forceinline -qoverride-limits -no-ansi-alias -Winline -qopt-report=5 -qopt-report-phase=all -diag-disable 10397 -Wl,-export-dynamic -O3 -DNDEBUG -std=gnu99 -o CMakeFiles/vpic.dir/src/boundary/link.c.o -c /users/ccranor/src/vpic/src/boundary/link.c This explains why "-O3" unexpectedly appears twice in the compile command ("make VERBOSE=1") when you run lanl-cts1 on GR, for example: Building C object CMakeFiles/vpic.dir/src/boundary/link.c.o the optimization level // -g3 specifies the debugging information level. Ive tried different combination of runtime (2.0/4. We need a C/C++ compiler, either GCC (GNU Compiler Collection) from MinGW or. I thought the optimization would only carried on build but turns out it didnt (the foreach loop is still as is on game build). The case of why optimization did not effect into account is unclear. Note that both "-O0" (from CMAKE_C_FLAGS) and "-O3 -DNDEBUG" (from CMAKE_BUILD_TYPE=Release) are both specified on the compile command line. So its just matter of setting the optimize flag to true. usr/bin/cc -O0 -O3 -DNDEBUG -o CMakeFiles/testin.dir/testin.c.o -c /tmp/testin/testin.c Make -f CMakeFiles/testin.dir/build.make CMakeFiles/testin.dir/testin.c.oīuilding C object CMakeFiles/testin.dir/testin.c.o Build files have been written to: /tmp/testin/b Check for working CXX compiler: /usr/bin/c++ - works Check for working CXX compiler: /usr/bin/c++ Check for working C compiler: /usr/bin/cc - works Check for working C compiler: /usr/bin/cc The CXX compiler identification is GNU 5.5.0 The C compiler identification is GNU 5.5.0 % cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_FLAGS="-O0". If you specify both CMAKE_BUILD_TYPE and put optimization flags in CMAKE_FLAGS at the same time, you'll get both sets of flags in your compile command line. Note that if CMAKE_BUILD_TYPE is not specified (i.e. The above gcc flags come from Modules/Compiler/GNU.cmake in the cmake library directory.ĬMAKE_ FLAGS gets merged into CMAKE_FLAGS. I'm trying to debug this, but the flow is a little obscure for me.
Codeblocks compiler optimization flags 64 bits#
Using Windows 10 32 bits or Windows 7 64 bits there is no problem.
The compiler flags are not shown, either in the Settings->Compiler window or in the Project->Build options window. The defaults with cmake are something like: CMAKE_C_FLAGS_DEBUG:STRING=-gĬMAKE_C_FLAGS_MINSIZEREL:STRING=-Os -DNDEBUGĬMAKE_C_FLAGS_RELEASE:STRING=-O3 -DNDEBUGĬMAKE_C_FLAGS_RELWITHDEBINFO:STRING=-O2 -g -DNDEBUGįor portability, the exact flag string used by cmake depends on which compiler it detects (since different compilers may have different flag syntax). Using Windows 10 64 bits, wx312 32 bits and GCC 7.2.0. The traditional way to set compiler optimization flags with cmake is to use CMAKE_BUILD_TYPE.
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