$ cat exc.d
void main() {
    try {
        throw new Exception("muh");
    } catch (Exception e) {
    }
}

$ dmd exc.d -L--gc-sections -L--print-gc-sections 2>&1 |grep exc
/usr/bin/ld: Removing unused section '.deh_eh' in file 'exc.o'
/usr/bin/ld: Removing unused section '.tdata' in file 'exc.o'

$ ./exc
unhandled exception

This "unhandled exception" thing is printed when the D runtime (Tango; based on Phobos1 runtime) doesn't find any exception records. It seems --gc-sections removes all D sections (including the bottom most exception handler in the runtime). It seems the linker removes all entries from section .deh_eh.

I wonder if this can be fixed. It works in g++.