configure fails in MSYS2 with deprecation warning in Texinfo/Parser.pm for ffnvcodec

[LigH]

Summary of the bug:

Building ffmpeg in MSYS2 / MinGW32 with GCC 8.2.0 and Perl 5.28.0-1, the configure step fails for ffnvcodec: Texinfo/Parser.pm complains about a deprecated "unescaped left brace in regex".

How to reproduce:

I let the media-autobuild_suite compile ffmpeg, which updates MSYS2 before updating all used libraries to their last revisions (except for cases where a specific revision is required due to bugs).

An archive of log files is attached to this report. The last error messages displayed are:

┌ ffmpeg git ........................................ [Recently updated]
├ Changing options to comply to nonfree...
├ Compiling static FFmpeg...
├ Running configure...
Likely error:
../configure --prefix=/local32 --bindir=/local32/bin-video --pkg-config-flags=--static --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --disable-debug --enable-ffnvcodec --enable-nvdec --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libmfx --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libwavpack --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libaom --enable-version3 --enable-chromaprint --enable-decklink --enable-frei0r --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libflite --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmodplug --enable-libopenh264 --enable-libopenmpt --enable-librtmp --enable-librubberband --enable-libssh --enable-libtesseract --enable-libxavs --enable-libzmq --enable-libzvbi --enable-opencl --enable-opengl --enable-libcodec2 --enable-libsrt --enable-ladspa --enable-openssl --extra-cflags=-fopenmp --extra-libs=-lgomp --extra-cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++ --extra-cflags=-DLIBSSH_STATIC --extra-ldflags=-Wl,--allow-multiple-definition --extra-cflags=-DCACA_STATIC --extra-cflags=-DMODPLUG_STATIC --extra-cflags=-DCHROMAPRINT_NODLL --extra-libs=-lstdc++ --extra-cflags=-DZMQ_STATIC --extra-libs=-lpsapi --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads --extra-cflags=-DKVZ_STATIC_LIB --enable-nonfree
Unescaped left brace in regex is deprecated here (and will be fatal in Perl 5.32), passed through in regex; marked by <-- HERE in m/^\s+@([[:alnum:]][[:alnum:]\-]*)({ <-- HERE })?\s*/ at /usr/share/texinfo/Texinfo/Parser.pm line 5481.
Unescaped left brace in regex is deprecated here (and will be fatal in Perl 5.32), passed through in regex; marked by <-- HERE in m/^\s+@([[:alnum:]][[:alnum:]\-]*)({ <-- HERE })?\s*(\@(c|comment)((\@|\s+).*)?)?/ at /usr/share/texinfo/Texinfo/Parser.pm line 5485.
ERROR: cuda requested, but not all dependencies are satisfied: ffnvcodec

[LigH]

Archived log files from compilation in media-autobuild_suite

[Hendrik]

Those warnings are unrelated. It fails because you requested CUDA features but the required headers are not available.

Please note that we cannot and will not debug issues with third party build scripts.

PS:
The warning is actually from /usr/share/texinfo/Texinfo/Parser.pm, a file local to your system.

[LigH]

OK, so these warnings were misleading for me, sorry...

I will correct my report in the ​issue for the suite, and this ticket can possibly be closed.