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00894ecf46
We get this error when building GDB on some platforms. I get it using
g++-10 on Ubuntu 20.04 (installed using the distro package). It was
also reported by John Baldwin, using a clang that uses libc++.
CXX unittests/parallel-for-selftests.o
cc1plus: warning: command line option '-Wmissing-prototypes' is valid for C/ObjC but not for C++
/home/smarchi/src/binutils-gdb/gdb/unittests/parallel-for-selftests.c: In function 'void selftests::parallel_for::test(int)':
/home/smarchi/src/binutils-gdb/gdb/unittests/parallel-for-selftests.c:53:30: error: use of deleted function 'std::atomic<int>::atomic(const std::atomic<int>&)'
53 | std::atomic<int> counter = 0;
| ^
In file included from /usr/include/c++/9/future:42,
from /home/smarchi/src/binutils-gdb/gdb/../gdbsupport/thread-pool.h:29,
from /home/smarchi/src/binutils-gdb/gdb/../gdbsupport/parallel-for.h:26,
from /home/smarchi/src/binutils-gdb/gdb/unittests/parallel-for-selftests.c:22:
/usr/include/c++/9/atomic:755:7: note: declared here
755 | atomic(const atomic&) = delete;
| ^~~~~~
/usr/include/c++/9/atomic:759:17: note: after user-defined conversion: 'constexpr std::atomic<int>::atomic(std::atomic<int>::__integral_type)'
759 | constexpr atomic(__integral_type __i) noexcept : __base_type(__i) { }
| ^~~~~~
I haven't dug to know why it does not happen everywhere, but this patch
fixes it by using the constructor to initialize the variable, rather
than the assignment operator.
Change-Id: I6b27958171bf6187f6a875657395fd10441db7e6
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.