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libiberty: remove FINAL and OVERRIDE from ansidecl.h

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libiberty's ansidecl.h provides macros FINAL and OVERRIDE to allow
virtual functions to be labelled with the C++11 "final" and "override"
specifiers, but with empty implementations on pre-C++11 C++ compilers.

We've used the macros in many places in GCC, but as of as of GCC 11
onwards GCC has required a C++11 compiler, such as GCC 4.8 or later.
On the assumption that any such compiler correctly implements "final"
and "override", I've simplified GCC's codebase by replacing all uses of
the FINAL and OVERRIDE macros in GCC's source tree with the lower-case
specifiers (via commits r13-690-gff171cb13df671 and
r13-716-g8473ef7be60443)

The macros are reportedly not used anywhere in binutils-gdb.

This patch completes this transition for GCC by eliminating the macros
from ansidecl.h.

include/ChangeLog:
	* ansidecl.h: Drop macros OVERRIDE and FINAL.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>
This commit is contained in:
David Malcolm 2022-05-24 10:22:37 -04:00
parent e8a25550da
commit 2c5c645663
1 changed files with 0 additions and 41 deletions
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41
include/ansidecl.h
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@ -321,47 +321,6 @@ So instead we use the macro below and test it against specific values. */
#define CONSTEXPR
#endif
/* C++11 adds the ability to add "override" after an implementation of a
virtual function in a subclass, to:
(A) document that this is an override of a virtual function
(B) allow the compiler to issue a warning if it isn't (e.g. a mismatch
of the type signature).
Similarly, it allows us to add a "final" to indicate that no subclass
may subsequently override the vfunc.
Provide OVERRIDE and FINAL as macros, allowing us to get these benefits
when compiling with C++11 support, but without requiring C++11.
For gcc, use "-std=c++11" to enable C++11 support; gcc 6 onwards enables
this by default (actually GNU++14). */
#if defined __cplusplus
# if __cplusplus >= 201103
/* C++11 claims to be available: use it. Final/override were only
implemented in 4.7, though. */
# if GCC_VERSION < 4007
# define OVERRIDE
# define FINAL
# else
# define OVERRIDE override
# define FINAL final
# endif
# elif GCC_VERSION >= 4007
/* G++ 4.7 supports __final in C++98. */
# define OVERRIDE
# define FINAL __final
# else
/* No C++11 support; leave the macros empty. */
# define OVERRIDE
# define FINAL
# endif
#else
/* No C++11 support; leave the macros empty. */
# define OVERRIDE
# define FINAL
#endif
/* A macro to disable the copy constructor and assignment operator.
When building with C++11 and above, the methods are explicitly
deleted, causing a compile-time error if something tries to copy.