link failure with mingw

[star-hengxing]

version: v0.12.1
full log: https://github.com/xmake-io/xmake-repo/actions/runs/11916365319/job/33208859126?pr=5783

{
  license = "Apache-2.0",
  libfiles = {
    "C:\Users\star\AppData\Local\.xmake\packages\l\libcoro\v0.12.1\0e3833677e234bbcb1d989de31a06b49\lib\liblibcoro.dll.a",
    "C:\Users\star\AppData\Local\.xmake\packages\l\libcoro\v0.12.1\0e3833677e234bbcb1d989de31a06b49\bin\libcoro.dll"
  },
  version = "v0.12.1",
  linkdirs = {
    "C:\Users\star\AppData\Local\.xmake\packages\l\libcoro\v0.12.1\0e3833677e234bbcb1d989de31a06b49\lib"
  },
  static = true,
  links = {
    "libcoro"
  },
  shared = true,
  includedirs = {
    "C:\Users\star\AppData\Local\.xmake\packages\l\libcoro\v0.12.1\0e3833677e234bbcb1d989de31a06b49\include"
  }
}

checking for C:\msys64\mingw64\bin\x86_64-w64-mingw32-g++ ... ok
checking for flags (-std=c++20) ... ok
checking for flags (-fdiagnostics-color=always) ... ok
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\.xmake\241120\_94B2CCDD690146708353F92630D437D0.o:_F157041C661645FDB44707D8887E67B9.cpp:(.text$_ZN4coro9sync_waitINS_4taskIyEEOyEEDcOT_[_ZN4coro9sync_waitINS_4taskIyEEOyEEDcOT_]+0x1c): undefined reference to `coro::detail::sync_wait_event::sync_wait_event(bool)'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\.xmake\241120\_94B2CCDD690146708353F92630D437D0.o:_F157041C661645FDB44707D8887E67B9.cpp:(.text$_ZN4coro9sync_waitINS_4taskIyEEOyEEDcOT_[_ZN4coro9sync_waitINS_4taskIyEEOyEEDcOT_]+0x5e): undefined reference to `coro::detail::sync_wait_event::wait()'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\msys64\tmp\.xmake\241120\_94B2CCDD690146708353F92630D437D0.o:_F157041C661645FDB44707D8887E67B9.cpp:(.text$_ZZN4coro6detail22sync_wait_task_promiseIOyE13final_suspendEvENK19completion_notifier13await_suspendENSt7__n486116coroutine_handleIS3_EE[_ZZN4coro6detail22sync_wait_task_promiseIOyE13final_suspendEvENK19completion_notifier13await_suspendENSt7__n486116coroutine_handleIS3_EE]+0x23): undefined reference to `coro::detail::sync_wait_event::set()'
collect2.exe: error: ld returned 1 exit status

test code:

auto make_task_inline = [](uint64_t x) -> coro::task<uint64_t> { co_return x + x; };
auto result = coro::sync_wait(make_task_inline(5));

I check the dll export table, only this symbols (global variable) are exported.

_ZN4coro9semaphore22acquire_result_unknownB5cxx11E
_ZN4coro9semaphore23acquire_result_acquiredB5cxx11E
_ZN4coro9semaphore32acquire_result_semaphore_stoppedB5cxx11E

Thanks to the work of #236, I check the code in the generated file export.hpp

#ifdef CORO_STATIC_DEFINE
#  define CORO_EXPORT
#  define CORO_NO_EXPORT
#else
#  ifndef CORO_EXPORT
#    ifdef libcoro_EXPORTS
        /* We are building this library */
#      define CORO_EXPORT __declspec(dllexport)
#    else
        /* We are using this library */
#      define CORO_EXPORT __declspec(dllimport)
#    endif
#  endif

Then I try to add cxflags -DCORO_EXPORT= override the __declspec(dllexport), it work.

https://sourceware.org/binutils/docs/ld.html#Options-Specific-to-i386-PE-Targets

--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.