Since around 2010/09/07 g++ started to barf on the attached source about a mismatched prototype. Apparently the culprit is the forward declaration + later definition with additional attribute of one of the argument, and, if the forward declaration is sprinkled with said attribute, the error goes away.
I've failed to reduce both manually and with delta (mismatched prototypes are too easily produced). Sorry. $ /usr/local/gcc-4.6-20100910/bin/g++ -std=c++0x -c synth.ii src/audio/synth_voice_impl.h:140:6: error: prototype for 'bool synth::voice::voice_t::produce_chunk(const synth::semitones_lut_t&, const synth::midi_channels_params_t&, synth::chunk_array_mono_t&)' does not match any in class 'synth::voice::voice_t' src/audio/synth_voice.h:153:156: error: candidate is: template<synth::voice::waves::waves_enum_t wave_shape> bool synth::voice::voice_t::produce_chunk(const synth::semitones_lut_t&, const synth::midi_channels_params_t&, synth::chunk_array_mono_t&) ... $ /usr/local/gcc-4.6-20100910/bin/g++ -v Using built-in specs. COLLECT_GCC=/usr/local/gcc-4.6-20100910/bin/g++ COLLECT_LTO_WRAPPER=/usr/local/gcc-4.6-20100910/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ../configure --prefix=/usr/local/gcc-4.6.0 --enable-languages=c,c++ --enable-threads=posix --disable-checking --disable-nls --with-system-zlib --disable-bootstrap --enable-checking=none --enable-mpfr --enable-gold --enable-lto --with-ppl --with-cloog --with-arch=native Thread model: posix gcc version 4.6.0 20100910 (experimental) (GCC) midi_channels_params_t is the trigger. Known to work on g++ 4.4.x, 4.5.x and up to and including 4.6-20100901. PS: http://gcc.gnu.org/ml/gcc/2010-09/msg00152.html -- Summary: g++ 4.6 regression, c++0x, weird mismatch for arguments with forwarded declaration when attributes are involved Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: tbptbp at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45642
