| # Integral type tests |
| |
| These tests check that various macros, constants and typedefs in |
| <stdint.h> and <stddef.h> are correct. |
| |
| There are two essentially identical source files, one in C and one in |
| C++. Certain types are built into C++ but not into C, so we need to |
| test both. Additionally, writing very precise tests comparing values |
| or types is considerably easier with C++ machinery like decltype and |
| templated type traits. |
| |
| Since `wchar_t` in particular is so finicky, it is separately tested |
| in source files that only include <wchar.h>. In the past there were |
| bugs where the `wchar_t` header was broken in a way that was masked by |
| the presence of <stdint.h>, which is very often the case. |
| |
| This level of detail in tests is valuable in part because compilers |
| (GCC and Clang) differ in what predefined macros they create. For |
| instance, sufficiently new GCCs define `__WCHAR_MIN__` as a builtin, |
| but Clang does not. |
