Using pre-compiled headers with CMake
There is a third party CMake module named ‘Cotire’ which automates the use of precompiled headers for CMake based build systems and also supports unity builds.
precompiled-headers
Why use precompiled headers (C/C++)?
In C/C++, the #include mechanism is a textual copy of the file specified into the current file. Headers include other headers (which include yet other headers), so when you do a #include, it could be adding tens of thousands of lines of C++ into each cpp file (or cxx, c, whatever), all of which need … Read more
How to fix .pch file missing on build?
NOTE: Later versions of the IDE may use “pch” rather than “stdafx” in the default names for related files. It may be necessary to substitute pch for stdafx in the instructions below. I apologize. It’s not my fault. Right-click on your project in the Solution Explorer. Click Properties at the bottom of the drop-down menu. … Read more
Precompiled Headers
What are precompiled headers? Often C++ source files include headers from external libraries. In Windows you include windows.h. These header files can be very large and they take some time to process. Each time you compile a C++ file the compiler has to read and process thousands of lines from these header files. But external … Read more
Precompiled headers with GCC
I have definitely had success. First, I used the following code: #include <boost/xpressive/xpressive.hpp> #include <iostream> using namespace std; using namespace boost::xpressive; // A simple regular expression test int main() { std::string hello(“Hello, World!”); sregex rex = sregex::compile( “(\\w+) (\\w+)!” ); smatch what; if( regex_match( hello, what, rex ) ) { std::cout << what[0] << ‘\n’; … Read more
GCC and Precompiled Headers
Current GCC (i.e. 4.7) and previous versions of it works nicely with precompiled headers only when you have a single common header to your application, and when that single header (which includes in turn all the system ones, and the library specific ones, required by the application) is #include-d (as the first non-comment lexeme of … Read more
Purpose of stdafx.h [duplicate]
stdafx.h is a file, generated by Microsoft Visual Studio IDE wizards, that describes both standard system and project specific include files that are used frequently but hardly ever change. Compatible compilers (for example, Visual C++ 6.0 and newer) will pre-compile this file to reduce overall compile times. Visual C++ will not compile anything before the … Read more