Красота и мощь Qt Graphics View Framework на примере

--export-all-symbols
If given, all global symbols in the objects used to build a DLL
will be exported by the DLL. Note that this is the default if
there otherwise wouldn't be any exported symbols. When symbols are
explicitly exported via DEF files or implicitly exported via func-
tion attributes, the default is to not export anything else unless
this option is given. Note that the symbols «DllMain@12», «DllEn-
tryPoint@0», «DllMainCRTStartup@12», and «impure_ptr» will not be
automatically exported. Also, symbols imported from other DLLs
will not be re-exported, nor will symbols specifying the DLL's
internal layout such as those beginning with "_head_" or ending
with "_iname". In addition, no symbols from «libgcc», «libstd++»,
«libmingw32», or «crtX.o» will be exported. Symbols whose names
begin with "__rtti_" or "__builtin_" will not be exported, to help
with C++ DLLs. Finally, there is an extensive list of cygwin-pri-
vate symbols that are not exported (obviously, this applies on when
building DLLs for cygwin targets). These cygwin-excludes are:
"_cygwin_dll_entry@12", "_cygwin_crt0_common@8", "_cygwin_noncyg-
win_dll_entry@12", "_fmode", "_impure_ptr", «cygwin_attach_dll»,
«cygwin_premain0», «cygwin_premain1», «cygwin_premain2», «cyg-
win_premain3», and «environ». [This option is specific to the i386
PE targeted port of the linker]