Depending on your build system it’s either in your qmake project file(.pro, standard for new projects) or in one of the CMake files (CMakeLists.txt, used by KDE and several other projects). Using .pro: QMAKE_CXXFLAGS += -O2 Using CMake: set( CMAKE_CXX_FLAGS “-g -Wall”)
You can select the options for the GPU Code Generation in this dialog: In this case “compute_20” means that i am compiling for the virtual compute architecture 2.0 – virtual architecture influences the PTX generation stage. The second part that comes after the coma is “sm_21”.This influences the CUBIN generation stage. It defines the real … Read more
Because This Question was marked as Duplicate, even if doesn’t have to do with it, because there is about Linker Flag and here is about Compiler Flags, I will post My answer HERE. You will have to go to Settings -> Compiler… and next you’ll have to click on Linker Settings TAB. On the right … Read more
By compiler: GCC: -Wa,-mbranches-within-32B-boundaries clang (10+): -mbranches-within-32B-boundaries compiler option directly, not -Wa. MSVC: /QIntel-jcc-erratum See Intel JCC Erratum – what is the effect of prefixes used for mitigation? ICC: TODO, look for docs. The GNU toolchain does mitigation in the assembler, with as -mbranches-within-32B-boundaries, which enables (GAS manual: x86 options): -malign-branch-boundary=32 (care about 32-byte boundaries). … Read more
Here are mine: -Wextra, -Wall: essential. -Wfloat-equal: useful because usually testing floating-point numbers for equality is bad. -Wundef: warn if an uninitialized identifier is evaluated in an #if directive. -Wshadow: warn whenever a local variable shadows another local variable, parameter or global variable or whenever a built-in function is shadowed. -Wpointer-arith: warn if anything depends … Read more
In the early days of gcc (2.8 etc.) and in the times of egcs, and redhat 2.96 -O3 was quite buggy sometimes. But this is over a decade ago, and -O3 is not much different than other levels of optimizations (in buggyness). It does however tend to reveal cases where people rely on undefined behavior, … Read more
I use it all the time in my coding. The -ansi flag is equivalent to -std=c89. As noted, it turns off some extensions of GCC. Adding -pedantic turns off more extensions and generates more warnings. For example, if you have a string literal longer than 509 characters, then -pedantic warns about that because it exceeds … Read more
Yes. From documentation v4.1.2 From documentation latest always_inline Generally, functions are not inlined unless optimization is specified. For functions declared inline, this attribute inlines the function even if no optimization level was specified.
You can use the -Q –help=target options: gcc -march=native -Q –help=target … The -v option may also be of use. You can see the documentation on the –help option here.
-pthread tells the compiler to link in the pthread library as well as configure the compilation for threads. For example, the following shows the macros that get defined when the -pthread option gets used on the GCC package installed on my Ubuntu machine: $ gcc -pthread -E -dM test.c > dm.pthread.txt $ gcc -E -dM … Read more