MinGW-w64 - for 32 and 64 bit Windows / Bugs / #406 setjmp/longjmp cause segmentation faults when used in a 64bit environment

I'm still observing this issue in a context roughly like this:

// other set-up
int status = 0;
try {
    // C++ code that can throw
} catch (...) {
    // populate some exception information
    status = 1;
}

if (status)
    // call C library in separate DLL that will longjmp

The over-arching goal is to ensure C longjmps occur in a context where no C++ objects (ie, objects with non-trivial destructors) are on the stack.

In fact, in my particular case, even attempting to directly call a setjmp / longjmp pair after that try-catch block fails (with a crash after a call to msvcrt!longjmp); however, calling __builtin_setjmp and __builtin_longjmp directly seems to work fine. However, the 'success' here seems to depend on stuff done within the try block...

Unfortunately, I haven't yet been able to produce a minimally reproducible example (I have a reproducible example -- it's just not minimal), so some more investigation might be needed.

In my case, I'm using a mingw64 build with SJLJ exceptions, win32 threads and gcc 4.9.3.

Using built-in specs.
COLLECT_GCC=C:\Rtools\GCC-49~1.3\bin\G__~1.EXE
COLLECT_LTO_WRAPPER=C:/Rtools/GCC-49~1.3/bin/../libexec/gcc/i686-w64-mingw32/4.9.3/lto-wrapper.exe
Target: i686-w64-mingw32
Configured with: ../../../src/gcc-4.9.3/configure --host=i686-w64-mingw32 --build=i686-w64-mingw32 --target=i686-w64-mingw32 --prefix=/mingw32 --with-sysroot=/home/Jeroen/mingw-gcc-4.9.3/i686-493-win32-sjlj-rt_v3-s/mingw32 --with-gxx-include-dir=/mingw32/i686-w64-mingw32/include/c++ --enable-static --disable-shared --enable-targets=all --enable-multilib --enable-languages=c,c++,fortran,lto --enable-libstdcxx-time=yes --enable-threads=win32 --enable-libgomp --enable-libatomic --enable-lto --enable-graphite --enable-checking=release --enable-fully-dynamic-string --enable-version-specific-runtime-libs --enable-sjlj-exceptions --disable-isl-version-check --disable-cloog-version-check --disable-libstdcxx-pch --disable-libstdcxx-debug --enable-bootstrap --disable-rpath --disable-win32-registry --disable-nls --disable-werror --disable-symvers --with-gnu-as --with-gnu-ld --with-arch-32=i686 --with-arch-64=nocona --with-tune-32=generic --with-tune-64=core2 --with-libiconv --with-system-zlib --with-gmp=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --with-mpfr=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --with-mpc=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --with-isl=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --with-cloog=/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static --enable-cloog-backend=isl --with-pkgversion='i686-win32-sjlj, Built by MinGW-W64 project' --with-bugurl=http://sourceforge.net/projects/mingw-w64 CFLAGS='-O2 -pipe -I/home/Jeroen/mingw-gcc-4.9.3/i686-493-win32-sjlj-rt_v3-s/mingw32/opt/include -I/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-zlib-static/include -I/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static/include' CXXFLAGS='-O2 -pipe -I/home/Jeroen/mingw-gcc-4.9.3/i686-493-win32-sjlj-rt_v3-s/mingw32/opt/include -I/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-zlib-static/include -I/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static/include' CPPFLAGS= LDFLAGS='-pipe -L/home/Jeroen/mingw-gcc-4.9.3/i686-493-win32-sjlj-rt_v3-s/mingw32/opt/lib -L/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-zlib-static/lib -L/home/Jeroen/mingw-gcc-4.9.3/prerequisites/i686-w64-mingw32-static/lib -Wl,--large-address-aware'
Thread model: win32
gcc version 4.9.3 (i686-win32-sjlj, Built by MinGW-W64 project)

setjmp/longjmp cause segmentation faults when used in a 64bit environment

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#406 setjmp/longjmp cause segmentation faults when used in a 64bit environment

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