[Bug build/31141] New: gdbsupport fails to compile with clang due to missing C++ prototype for operator delete

["jremus at linux dot ibm.com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31141

            Bug ID: 31141
           Summary: gdbsupport fails to compile with clang due to missing
                    C++ prototype for operator delete
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: jremus at linux dot ibm.com
  Target Milestone: ---

gdbsupport fails to compile with clang on s390x and x86 since commit
553b78748fd ("Rely on C++17 <new> in new-op.cc") as follows:

$ make
make  all-recursive
make[1]: Entering directory
'/home/jremus/my-dev-stuff/binutils-build/gdbsupport'
make[2]: Entering directory
'/home/jremus/my-dev-stuff/binutils-build/gdbsupport'
  CXX      new-op.o
../../binutils-gdb/gdbsupport/new-op.cc:114:1: error: no previous prototype for
function 'operator delete' [-Werror,-Wmissing-prototypes]
operator delete (void *p, std::size_t) noexcept
^
../../binutils-gdb/gdbsupport/new-op.cc:113:1: note: declare 'static' if the
function is not intended to be used outside of this translation unit
void
^
static
../../binutils-gdb/gdbsupport/new-op.cc:132:1: error: no previous prototype for
function 'operator delete[]' [-Werror,-Wmissing-prototypes]
operator delete[] (void *p, std::size_t) noexcept
^
../../binutils-gdb/gdbsupport/new-op.cc:131:1: note: declare 'static' if the
function is not intended to be used outside of this translation unit
void
^
static
2 errors generated.
make[2]: *** [Makefile:554: new-op.o] Error 1
make[2]: Leaving directory
'/home/jremus/my-dev-stuff/binutils-build/gdbsupport'
make[1]: *** [Makefile:574: all-recursive] Error 1
make[1]: Leaving directory
'/home/jremus/my-dev-stuff/binutils-build/gdbsupport'
make: *** [Makefile:446: all] Error 2


It works again when reverting commit 553b78748fd ("Rely on C++17 <new> in
new-op.cc").


My approach to build with clang are as follows:

cd $HOME
git clone git://sourceware.org/git/binutils-gdb.git
mkdir binutils-build
cd binutils-build
CC=clang CXX=clang++ ../binutils-gdb/configure
make


My above test build on x86 was on Fedora 38 with clang 16.0.6 and gcc C++
system header files from package libstdc++-devel 13.2.1.

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