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Reported by Mau Magnaguagno See: https://github.com/ruby/ruby/pull/3570#discussion_r495465903
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Since r63443, `-std=gnu99 -D_XOPEN_SOUCE=x00` is added to Solaris'
`CPPFLAGS`. `CPPFLAGS` is shared among `CC` / `CXX`. This results in
both `__STDC_VERSION__` and `__cplusplus` to be defined at the same time
for a C++ compilation, only on Solaris.
It seems the `CPPFLAGS` addition is intentional. We sould not touch
that part. Instead we need to reroute this by always check for
`__cplusplus` first.
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Added description and URL about nested flexible array member.
Notes:
Merged: https://github.com/ruby/ruby/pull/3570
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Was definitely a bad idea to use constexpr. It is not ubiquitous.
Notes:
Merged: https://github.com/ruby/ruby/pull/3570
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It is reported that on a system of i386 System V ABI, GCC returns 8 for
__alignof__(double). OTOH the ABI defines alignments of double to be 4,
and ISO/IEC 9899:2011 reads that _Alignof(double) shall return 4 on such
machine. What we want in ruby is 4 instead of 8 there. We cannot use
__alignof__.
Additionally, both old GCC / old clang return 8 for _Alignof(double) on
such platforms. They are their bugs, and already fixed in recent
versions. But we have to support older compilers for a while. Shall
check sanity of _Alignof.
Notes:
Merged: https://github.com/ruby/ruby/pull/3570
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To fix build failures.
Notes:
Merged: https://github.com/ruby/ruby/pull/3079
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Devs do not love "impl".
Notes:
Merged: https://github.com/ruby/ruby/pull/3079
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