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MINOR: compiler: add a __has_builtin() macro to detect features more easily

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We already have a __has_attribute() macro to detect when the compiler
supports a specific attribute, but we didn't have the equivalent for
builtins. clang-3 and gcc-10 have __has_builtin() for this. Let's just
bring it using the same mechanism as __has_attribute(), which will allow
us to simply define the macro's value for older compilers. It will save
us from keeping that many compiler-specific tests that are incomplete
(e.g. the __builtin_unreachable() test currently doesn't cover clang).
This commit is contained in:
Willy Tarreau 2024-12-17 08:54:23 +01:00
parent 4710ab5604
commit 96cfcb1df3
1 changed files with 8 additions and 0 deletions
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8
include/haproxy/compiler.h
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@ -66,6 +66,14 @@
#define __has_attribute(x) __equals_1(__has_attribute_ ## x)
#endif
/* gcc 10 and clang 3 brought __has_builtin() to test if a builtin exists.
* Just like above, if it doesn't exist, we remap it to a macro allowing us
* to define these ourselves by defining __has_builtin_<name> to 1.
*/
#ifndef __has_builtin
#define __has_builtin(x) __equals_1(__has_builtin_ ## x)
#endif
/* The fallthrough attribute arrived with gcc 7, the same version that started
* to emit the fallthrough warnings and to parse the comments. Comments do not
* manage to stop the warning when preprocessing is split from compiling (e.g.