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Catch is designed to "just work" as much as possible. For most people the only configuration needed is telling Catch which source file should host all the implementation code (CATCH_CONFIG_MAIN).
Nonetheless there are still some occasions where finer control is needed. For these occasions Catch exposes a small set of macros for configuring how it is built.
main()/ implementation
CATCH_CONFIG_MAIN // Designates this as implementation file and defines main()
CATCH_CONFIG_RUNNER // Designates this as implementation file
Although Catch is header only it still, internally, maintains a distinction between interface headers and headers that contain implementation. Only one source file in your test project should compile the implementation headers and this is controlled through the use of one of these macros - one of these identifiers should be defined before including Catch in exactly one implementation file in your project.
Prefixing Catch macros
CATCH_CONFIG_PREFIX_ALL
To keep test code clean and uncluttered Catch uses short macro names (e.g. TEST_CASE and REQUIRE). Occasionally these may conflict with identifiers from platform headers or the system under test. In this case the above identifier can be defined. This will cause all the Catch user macros to be prefixed with CATCH_ (e.g. CATCH_TEST_CASE and CATCH_REQUIRE).
Terminal colour
CATCH_CONFIG_COLOUR_NONE // completely disables all text colouring
CATCH_CONFIG_COLOUR_WINDOWS // forces the Win32 console API to be used
CATCH_CONFIG_COLOUR_ANSI // forces ANSI colour codes to be used
Yes, I am English, so I will continue to spell "colour" with a 'u'.
When sending output to the terminal, if it detects that it can, Catch will use colourised text. On Windows the Win32 API, SetConsoleTextAttribute, is used. On POSIX systems ANSI colour escape codes are inserted into the stream.
For finer control you can define one of the above identifiers (these are mutually exclusive - but that is not checked so may behave unexpectedly if you mix them):
Note that when ANSI colour codes are used "unistd.h" must be includable - along with a definition of isatty()
Typically you should place the #define before #including "catch.hpp" in your main source file - but if you prefer you can define it for your whole project by whatever your IDE or build system provides for you to do so.
Console width
CATCH_CONFIG_CONSOLE_WIDTH = x // where x is a number
Catch formats output intended for the console to fit within a fixed number of characters. This is especially important as indentation is used extensively and uncontrolled line wraps break this. By default a console width of 80 is assumed but this can be controlled by defining the above identifier to be a different value.
stdout
CATCH_CONFIG_NOSTDOUT
Catch does not use std::cout and std::cerr directly but gets them from Catch::cout() and Catch::cerr() respectively. If the above identifier is defined these functions are left unimplemented and you must implement them yourself. Their signatures are:
std::ostream& cout();
std::ostream& cerr();
This can be useful on certain platforms that do not provide std::cout and std::cerr, such as certain embedded systems.
C++ conformance toggles
CATCH_CONFIG_CPP11_NULLPTR
CATCH_CONFIG_CPP11_NOEXCEPT
CATCH_CONFIG_SFINAE // Basic, C++03, support for SFINAE
CATCH_CONFIG_VARIADIC_MACROS // Usually pre-C++11 compiler extensions are sufficient
CATCH_CONFIG_NO_VARIADIC_MACROS // Suppress if Catch is too eager to enable it
Catch has some basic compiler detection that will attempt to select the appropriate mix of these macros. However being incomplete - and often without access to the respective compilers - this detection tends to be conservative. So overriding control is given to the user. If a compiler supports a feature (and Catch does not already detect it) then one or more of these may be defined to enable it (or suppress it, in some cases). If you do do this please raise an issue, specifying your compiler version (ideally with an idea of how to detect it) and stating that it has such support.