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Include stdbool.h without checking with autoconf

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As reported in <https://bugs.ruby-lang.org/issues/21340>, older autoconf
have an AC_HEADER_STDBOOL that's incompatible with C23. Autoconf 2.72
fixed the macro, but also mentions that it's obsolescent since all
current compilers have this header.

Since we require C99 [1] and VS 2015 [2], we might actually be able take
that suggestion and include stdbool.h without a check. I want to try
this on rubyci.org and will revert if this cause any issues. Not
touching AC_HEADER_STDBOOL in configure.ac for now.

[1]: https://bugs.ruby-lang.org/issues/15347
[2]: https://bugs.ruby-lang.org/issues/19982
This commit is contained in:
Alan Wu 2025-05-21 00:58:32 +09:00 committed by GitHub
parent ce5eb2803e
commit 2297afda7f
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Notes: git 2025-05-20 16:00:17 +00:00 
Merged: https://github.com/ruby/ruby/pull/13384

Merged-By: XrXr
1 changed files with 2 additions and 10 deletions
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12
include/ruby/internal/stdbool.h
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@ -31,17 +31,9 @@
# define __bool_true_false_are_defined
# endif
#elif defined(HAVE_STDBOOL_H)
# /* Take stdbool.h definition. */
#else
# /* Take stdbool.h definition. It exists since GCC 3.0 and VS 2015. */
# include <stdbool.h>
#elif !defined(HAVE__BOOL)
typedef unsigned char _Bool;
# /* See also http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2229.htm */
# define bool _Bool
# define true ((_Bool)+1)
# define false ((_Bool)+0)
# define __bool_true_false_are_defined
#endif
#endif /* RBIMPL_STDBOOL_H */