Created attachment 433772 [details, diff] cxx14-compat.patch Here's the relevant part of the build log: -- >8 -- Precompiling src/emu/emu.h... x86_64-pc-linux-gnu-g++ ${CXXFLAGS} ${CXXFLAGS} -MMD -MP -MP -DPTR64=1 -DNDEBUG -DCRLF=2 -DLSB_FIRST -DXMD_H -DFLAC__NO_DLL -DNATIVE_DRC=drcbe_x64 -DLUA_COMPAT_ALL -DLUA_COMPAT_5_1 -DLUA_COMPAT_5_2 -DUSE_OPENMP=1 -I../../../../../src/osd -I../../../../../src/emu -I../../../../../src/lib/util -m64 --pipe -Wno-deprecated-declarations -O3 -fno-strict-aliasing -fopenmp -Wall -Wcast-align -Wundef -Wformat-security -Wwrite-strings -Wno-sign-compare -Wno-conversion -Wno-unused-result -Wno-array-bounds -m64 -x c++ -std=c++14 -Woverloaded-virtual -x c++-header -DPTR64=1 -DNDEBUG -DCRLF=2 -DLSB_FIRST -DXMD_H -DFLAC__NO_DLL -DNATIVE_DRC=drcbe_x64 -DLUA_COMPAT_ALL -DLUA_COMPAT_5_1 -DLUA_COMPAT_5_2 -DUSE_OPENMP=1 -I../../../../../src/osd -I../../../../../src/emu -I../../../../../src/lib/util -o "../../../../linux_gcc/obj/x64/Release/emu.h.gch" -c "../../../../../src/emu/emu.h" In file included from ../../../../../src/lib/util/corestr.h:17:0, from ../../../../../src/emu/emucore.h:36, from ../../../../../src/emu/emu.h:28: ../../../../../src/lib/util/strformat.h: In constructor 'util::detail::format_argument_pack<Stream>::format_argument_pack(Format&&, const util::detail::format_argument<Stream>*, std::enable_if_t<util::detail::format_argument_pack<Stream>::handle_char_array<typename std::remove_reference<Format>::type>::value, long unsigned int>)': ../../../../../src/lib/util/strformat.h:1097:13: error: 'cbegin' is not a member of 'std' : m_begin(std::cbegin(fmt)) ^ ../../../../../src/lib/util/strformat.h:1098:11: error: 'cend' is not a member of 'std' , m_end(std::cend(fmt)) ^ ../../../../../src/lib/util/strformat.h: In constructor 'util::detail::format_argument_pack<Stream>::format_argument_pack(Format&&, const util::detail::format_argument<Stream>*, std::enable_if_t<util::detail::format_argument_pack<Stream>::handle_container<typename std::remove_reference<Format>::type>::value, long unsigned int>)': ../../../../../src/lib/util/strformat.h:1113:39: error: 'cbegin' is not a member of 'std' : m_begin(fmt.empty() ? nullptr : &*std::cbegin(fmt)) ^ ../../../../../src/lib/util/strformat.h:1114:60: error: 'cbegin' is not a member of 'std' , m_end(fmt.empty() ? nullptr : (m_begin + std::distance(std::cbegin(fmt), st ^ ../../../../../src/lib/util/strformat.h:1114:78: error: 'cend' is not a member of 'std' (fmt.empty() ? nullptr : (m_begin + std::distance(std::cbegin(fmt), std::cend(f ^ precompile.make:263: recipe for target '../../../../linux_gcc/obj/x64/Release/emu.h.gch' failed make[2]: *** [../../../../linux_gcc/obj/x64/Release/emu.h.gch] Error 1 Makefile:58: recipe for target 'precompile' failed make[1]: *** [precompile] Error 2 make[1]: Leaving directory '/tmp/portage/games-emulation/sdlmame-0.173/work/build/projects/sdl/mame/gmake-linux' makefile:1192: recipe for target 'linux_x64' failed make: *** [linux_x64] Error 2 * ERROR: games-emulation/sdlmame-0.173::gentoo failed (compile phase): * emake failed -->8 -- The problem is that gcc-4.9's support for C++14 is experimental and incomplete. The global functions cbegin, cend, etc. were added in gcc-5.1 (see <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64656>). There is a workaround in mame's strformat.h, but the check whether to enable it is broken. That check was changed here: <https://github.com/mamedev/mame/commit/078e954270872fd65a7d6d9d7a41c3c73346d526>. See the comments on that commit for why both the new and the old check are broken (although the old one might work for gentoo). The attached patch should work with either version of libstdc++ (or you could create a patch that reverts the commit linked above if you prefer that route).
what is this? a bug with a patch attached that works around a problem? I'd almost forgotten what such a thing looked like. in portage. thanks for the bug report and patch.
Now also fixed upstream (in 0.175).
