Fails to build multiple packages, compiler states "ISO C++17 does not allow dynamic exception specifications"

[jakint0sh]

It seems there is a C++ standard configuration error for freeimage, lotsa complaints about stuff not being okay in C++ 17.

Terminal output and logfile: https://gist.github.com/jakint0sh/de909bfcca8a4a20dd89cf86cd52fefa

[jakint0sh]

Just ran into a nearly identical error building libical:

Failed to build package libical for target i686-w64-mingw32.static!
------------------------------------------------------------
make[3]: *** [CMakeFiles/Makefile2:385: src/libical/CMakeFiles/ical_cxx-static.dir/all] Error 2
make[3]: Leaving directory '/home/jack/dev/mxe-dl/tmp-libical-i686-w64-mingw32.static/libical-2.0.0.build_'
make[2]: *** [Makefile:146: all] Error 2
make[2]: Leaving directory '/home/jack/dev/mxe-dl/tmp-libical-i686-w64-mingw32.static/libical-2.0.0.build_'
make[1]: *** [Makefile:903: build-only-libical_i686-w64-mingw32.static] Error 2
make[1]: Leaving directory '/home/jack/dev/mxe-dl'
real	0m52.462s
user	0m45.163s
sys	0m7.246s
------------------------------------------------------------
[log]      /home/jack/dev/mxe-dl/log/libical_i686-w64-mingw32.static

make: *** [Makefile:891: /home/jack/dev/mxe-dl/usr/i686-w64-mingw32.static/installed/libical] Error 1

Logfile: https://gist.github.com/jakint0sh/f4ac50d95105e70ceabc66951f007cc5

This may be a broader-scope configuration issue...

[uncle-ben-devel]

I can confirm the problem for freeimage. I tried the x86_64 mingw build.
It will work when using -std=gnu++14 or -std=gnu++11 at compile time.
This can be archived in multiple ways. I edited the patch file using sed:

sed -i 's/CXXFLAGS ?= -O3 -fexceptions -Wno-ctor-dtor-privacy -Wno-narrowing -DNDEBUG $(WIN32_CXXFLAGS)/CXXFLAGS ?= -std=gnu++14 -O3 -fexceptions -Wno-ctor-dtor-privacy -Wno-narrowing -DNDEBUG $(WIN32_CXXFLAGS)/g' "$MXE_ROOT/src/freeimage-1-fixes.patch"

The problem seems to be that the source code is not C++17 compliant, and no C++ standard was specified in the project's original makefile.

[uncle-ben-devel]

Version 3.15.4 of Freeimage is positively ancient, too (from 2012).
By then, C++17 did not even exist.
I tried with the latest version, which is 3.18.0 (from 2018), with the checksum f41379682f9ada94ea7b34fe86bf9ee00935a3147be41b6569c9605a53e438fd.

Unfortunately, it seems the patch won't apply correctly to that version (or 3.17.0, for that matter).
So for now, the best solution seems to be enforcing C++11 or C++14 on that project.

[uncle-ben-devel]

The issue is similar with libical. That one can be made to fail in a different way when using C++11 or C++14.

sed -i 's/-DUSE_BUILTIN_TZDATA=true/-DUSE_BUILTIN_TZDATA=true -DCMAKE_CXX_STANDARD=11/g' "$MXE_ROOT/src/libical.mk"

Can be used on that one.

It will fail differently then, complaining about undefined references regarding the icu_74 namespace in the libicuin.a target, so it might miss a linker setting to link against whatever library provides it.
One sample:

undefined reference to `icu_74::SimpleFormatter::format(icu_74::UnicodeString const&, icu_74::UnicodeString&, UErrorCode&) const'