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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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Split ruby.h
Notes:
Merged-By: shyouhei <shyouhei@ruby-lang.org>
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ruby/ruby.h includes ruby/assert.h, and RUBY_NDEBUG is defined
by checking NDEBUG. In other words, NDEBUG is only seen just
after ruby/ruby.h. This patch also cheks NDEBUG just after
including ruby_assert.h.
Without this patch, assertions in array.c are always enabled.
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Should avoid such thing.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61546 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* ruby_assert.h (RUBY_ASSERT_WHEN): fix reference to macro name
* vm_core.h: include ruby_assert.h before using
[ruby-core:73371]
This does not fix the test failure documented in [ruby-core:73371],
that is for later.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53653 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* vm_core.h (VM_ASSERT): use RUBY_ASSERT instead of rb_bug.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53616 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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* error.c (rb_assert_failure): assertion with stack dump.
* ruby_assert.h (RUBY_ASSERT): new header for the assertion.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53615 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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