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Devs do not love "3".
Notes:
Merged: https://github.com/ruby/ruby/pull/3079
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According to MSVC manual (*1), cl.exe can skip including a header file
when that:
- contains #pragma once, or
- starts with #ifndef, or
- starts with #if ! defined.
GCC has a similar trick (*2), but it acts more stricter (e. g. there
must be _no tokens_ outside of #ifndef...#endif).
Sun C lacked #pragma once for a looong time. Oracle Developer Studio
12.5 finally implemented it, but we cannot assume such recent version.
This changeset modifies header files so that each of them include
strictly one #ifndef...#endif. I believe this is the most portable way
to trigger compiler optimizations. [Bug #16770]
*1: https://docs.microsoft.com/en-us/cpp/preprocessor/once
*2: https://gcc.gnu.org/onlinedocs/cppinternals/Guard-Macros.html
Notes:
Merged: https://github.com/ruby/ruby/pull/3023
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icc warns at this line.
> include/ruby/3/core/rstring.h(126): warning #413: variable "retval" has an uninitialized const field
> struct RString retval;
> ^
This must not be a problem because uninitialized const field is not used
at all. But the warnings are annoying. Let us suppress them.
Notes:
Merged: https://github.com/ruby/ruby/pull/3011
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RUBY3_CAST is a macro to suppress g++/clang++ warnings about C-style
casts. Though Ruby core don't have to bother C++ situations, extension
libraries can benefit from this.
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Split ruby.h
Notes:
Merged-By: shyouhei <[email protected]>
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