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| author | Sverker Eriksson <[email protected]> | 2014-12-02 17:37:13 +0100 |
|---|---|---|
| committer | Sverker Eriksson <[email protected]> | 2014-12-02 17:37:13 +0100 |
| commit | b3e52c026ce4920e1a4e36ef98e5de94666e91ef (patch) | |
| tree | acd32450496744ade5043d8b56cb32b5f3dae1c2 /erts/emulator/beam/sys.h | |
| parent | c0067390b80f015a0342284505543d099b9e20e6 (diff) | |
| download | otp-b3e52c026ce4920e1a4e36ef98e5de94666e91ef.tar.gz otp-b3e52c026ce4920e1a4e36ef98e5de94666e91ef.tar.bz2 otp-b3e52c026ce4920e1a4e36ef98e5de94666e91ef.zip | |
erts: Add compile time assert ERTS_CT_ASSERT
and usage
Diffstat (limited to 'erts/emulator/beam/sys.h')
| -rw-r--r-- | erts/emulator/beam/sys.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/erts/emulator/beam/sys.h b/erts/emulator/beam/sys.h index c29d4b3777..7661bf2dc7 100644 --- a/erts/emulator/beam/sys.h +++ b/erts/emulator/beam/sys.h @@ -189,6 +189,22 @@ __decl_noreturn void __noreturn erl_assert_error(const char* expr, const char *f #endif /* + * Compile time assert + * (the actual compiler error msg can be a bit confusing) + */ +#if ERTS_AT_LEAST_GCC_VSN__(3,1,1) +# define ERTS_CT_ASSERT(e) \ + do { \ + enum { compile_time_assert__ = __builtin_choose_expr((e),0,(void)0) }; \ + } while(0) +#else +# define ERTS_CT_ASSERT(e) \ + do { \ + enum { compile_time_assert__ = 1/(e) }; \ + } while (0) +#endif + +/* * Microsoft C/C++: We certainly want to use stdarg.h and prototypes. * But MSC doesn't define __STDC__, unless we compile with the -Za * flag (strict ANSI C, no Microsoft extension). Compiling with -Za |