Compilation of praat.cpp fails on i386 with g++ 13

[rlaboiss]

The autobuild on an i386 system for the praat Debian package fails for version 6.3.11. The previous version (6.3.10) successfully built.

The sensible difference between these two runs is the fact that the former was built against g++ v12 and the latter against g++ v13.

The error message is the following:

Crashing bug: Praat will crash. Please notify the author (paul.boersma@uva.nl) with all of the following information (and please mention in your email precisely what you were doing when this crash occurred):

Assertion failed in file "praat.cpp" at line 2208:
   x3 [2] == 2.718

This error message percolated all the way to the top.

I wonder if the code in line 2207 of file sys/praat.cpp works properly on a 32-bit system.

[rlaboiss]

I am currently applying a patch to the Debian package, which comments out the lines 2207 to 2010 in sys/praat.cpp.

[AdrianBunk]

The sensible difference between these two runs is the fact that the former was built against g++ v12 and the latter against g++ v13.

Yes, gcc 13 has new excess precision issues in C++ on i386/m68k/s390x.

There are two possible solutions:

• build with -std=gnu++17 instead of -std=c++17 (e.g. by appending it to CXXFLAGS in debian/mk-vars-hardening), or
• add -fexcess-precision=fast to CXXFLAGS

[rlaboiss]

According to the GCC documentation, -fexcess-precision=fast is the default. Wouldn't the second option (add -fexcess-precision=fast to CXXFLAGS) be moot?

[AdrianBunk]

@rlaboiss The default differs in the "strict conformance" part of the paragraph.

[rlaboiss]

@AdrianBunk: I changed the Debian package according to your suggestion (commit aaf9e43). The FTBFS is apparently fixed on i386 and the change does not seem to have an impact on amd64. Thanks for the tip!