compilation-time

Is there a way to include a library only if it is available to the compiler? I thought about checking it with #ifndef (as shown below) but it just checks if a macro name is not defined and what I really need is to check if the compiler can reach to a C library in the compilation time. #ifndef _MY_LIBRARY_H #include "my_library.h" #endif Is there a way to do this verification? Clang and GCC have had a __has_include macro for a very long time, which you can use like this: #if __has_include("my_library.h") #include "my_library.h" #endif It works with angle brackets too (in fact, it works with

Is there options, except -O0 , that can speed up compilation time? It's not matter if resulting programs will be not optimised. Actually I want to just type-check large haskell package often and fast. Flag -fno-code dramatically speeds up compilation but it's not possible to use it because TemplateHaskell is used by this program. Looks like a task for hdevtools ! Hdevtools is used to as a backend for vim-plugin of the same name and it provides speedy syntax and type checking, directly from the editor. It is about as fast as ghci when reloading modules. I assume that it can be used from the

I am compiling 2 C++ projects in a buildbot, on each commit. Both are around 1000 files, one is 100 kloc, the other 170 kloc. Compilation times are very different from gcc (4.4) to Visual C++ (2008). Visual C++ compilations for one project take in the 20 minutes. They cannot take advantage of the multiple cores because a project depend on the other. In the end, a full compilation of both projects in Debug and Release, in 32 and 64 bits takes more than 2 1/2 hours. gcc compilations for one project take in the 4 minutes. It can be parallelized on the 4 cores and takes around 1 min 10 secs. All 8

It is well known that If compiling takes even 15 seconds, programmers will get bored while the compiler runs and switch over to reading The Onion , which will suck them in and kill hours of productivity. Our MonoTouch app takes 40 seconds to compile on Macbook Air in Debug/Simulator configuration. We have about 10 assemblies in the solution. We're also linking against some native libraries with gcc_flags . I'm sure there are ways to optimize compilation time that I'm not aware of, which might have to do with references, linker, whatever. I'm asking this question in hope that someone with