Hi,
On Mon, 16 Mar 2020 at 23:54, Jonathan Wakely via Gcc-patches <gcc-patches@gcc.gnu.org> wrote: > > The service_already_exists exception type specified in the TS doesn't > have any constructors defined. Since its base class isn't default > constructible, that means has no usable constructors. This may be a > defect in the TS. > > This patch fixes it by adding a default constructor, but making it > private. The make_service function is declared as a friend to be able to > call that private constructor. > > PR libstdc++/94199 > * include/experimental/executor (service_already_exists): Add default > constructor. Declare make_service to be a friend. > * testsuite/experimental/net/execution_context/make_service.cc: New > test. > The new test fails on arm-eabi / aarch64-elf (aka bare-metal / newlib targets), because: /arm-none-eabi/libstdc++-v3/include/experimental/executor:514: error: 'mutex' in namespace 'std' does not name a type /arm-none-eabi/libstdc++-v3/include/experimental/executor:561: error: 'mutex' is not a member of 'std' [...] I don't remember what's the usual "fix" for this Thanks, Christophe > Tested powerpc64le-linux, committed to master. > > I'll backport it to gcc-9 too. >
