Why do my tests take so long to compile?

Contents
Short answer
Long answer
Practical example
Other possible solutions

Several people have reported that test code written with Catch takes much longer to compile than they would expect. Why is that?

Catch is implemented entirely in headers. There is a little overhead due to this - but not as much as you might think - and you can minimise it simply by organising your test code as follows:

Short answer

Exactly one source file must #define either CATCH_CONFIG_MAIN or CATCH_CONFIG_RUNNER before #include-ing Catch. In this file do not write any test cases! In most cases that means this file will just contain two lines (the #define and the #include).

Long answer

Usually C++ code is split between a header file, containing declarations and prototypes, and an implementation file (.cpp) containing the definition, or implementation, code. Each implementation file, along with all the headers that it includes (and which those headers include, etc), is expanded into a single entity called a translation unit - which is then passed to the compiler and compiled down to an object file.

But functions and methods can also be written inline in header files. The downside to this is that these definitions will then be compiled in every translation unit that includes the header.

Because Catch is implemented entirely in headers you might think that the whole of Catch must be compiled into every translation unit that uses it! Actually it's not quite as bad as that. Catch mitigates this situation by effectively maintaining the traditional separation between the implementation code and declarations. Internally the implementation code is protected by #ifdefs and is conditionally compiled into only one translation unit. This translation unit is that one that #defines CATCH_CONFIG_MAIN or CATCH_CONFIG_RUNNER. Let's call this the main source file.

As a result the main source file does compile the whole of Catch every time! So it makes sense to dedicate this file to only #define-ing the identifier and #include-ing Catch (and implementing the runner code, if you're doing that). Keep all your test cases in other files. This way you won't pay the recompilation cost for the whole of Catch

Practical example

Assume you have the Factorial function from the tutorial in factorial.cpp (with forward declaration in factorial.h) and want to test it and keep the compile times down when adding new tests. Then you should have 2 files, tests-main.cpp and tests-factorial.cpp:

// tests-main.cpp
#define CATCH_CONFIG_MAIN
#include "catch.hpp"

// tests-factorial.cpp
#include "catch.hpp"

#include "factorial.h"

TEST_CASE( "Factorials are computed", "[factorial]" ) {
    REQUIRE( Factorial(1) == 1 );
    REQUIRE( Factorial(2) == 2 );
    REQUIRE( Factorial(3) == 6 );
    REQUIRE( Factorial(10) == 3628800 );
}

After compiling tests-main.cpp once, it is enough to link it with separately compiled tests-factorial.cpp. This means that adding more tests to tests-factorial.cpp, will not result in recompiling Catch's main and the resulting compilation times will decrease substantially.

$ g++ tests-main.cpp -c
$ g++ tests-main.o tests-factorial.cpp -o tests && ./tests -r compact
Passed 1 test case with 4 assertions.

Now, the next time we change the file tests-factorial.cpp (say we add REQUIRE( Factorial(0) == 1)), it is enough to recompile the tests instead of recompiling main as well:

$ g++ tests-main.o tests-factorial.cpp -o tests && ./tests -r compact
tests-factorial.cpp:11: failed: Factorial(0) == 1 for: 0 == 1
Failed 1 test case, failed 1 assertion.