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workaround for C++ 98 const union problem.

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Not the case of recent compilers, but compilers before C++11
rejected ruby.h, like 27225706/job/qjca7dpe204dytbd

This is supposedly because a struct with a member qualified with
a const effectively deletes its default copy constructor, which
is considered as being user-defined somehow.  Not sure where
exactly is the phrase in the C++98 standard who allows such C /
C++ incompatibility though.
This commit is contained in:
卜部昌平 2019-09-09 11:13:31 +09:00
parent 042c436cd9
commit 150f514e19
Notes: git 2019-09-09 21:28:05 +09:00
1 changed files with 6 additions and 1 deletions
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7
include/ruby/ruby.h
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@ -1054,7 +1054,12 @@ struct RArray {
long len; long len;
union { union {
long capa; long capa;
const VALUE shared_root; #if defined(__clang__) /* <- clang++ is sane */ || \
!defined(__cplusplus) /* <- C99 is sane */ || \
(__cplusplus > 199711L) /* <- C++11 is sane */
const
#endif
VALUE shared_root;
} aux; } aux;
const VALUE *ptr; const VALUE *ptr;
} heap; } heap;