Removed support for mingw-std-threads

The support for MinGW >= 11 is broken (meganz/mingw-std-threads#79),
which prevents building on Debian Bookworm.

This commit fixes it by explicitely building with the POSIX variant of MinGW, which has built-in
support for std threads.

Author: socram8888

CMakeLists.txt

@@ -50,11 +50,6 @@ set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 # 3P dependencies.
 include(BuildFmt)
 include(BuildSpdlog)
-
-if (BUILD_LINUX_MIDDLEWARE)
-    include(BuildMingwStdThreads)
-endif()
-
 include(BuildGoogleTest)
 
 if (BUILD_TESTS)

README.md

@@ -48,7 +48,7 @@ sudo apt install windows-fido-bridge
 You can also build this repository from source:
 
 ```
-sudo apt install build-essential cmake g++-mingw-w64-x86-64 git
+sudo apt install build-essential cmake g++-mingw-w64-x86-64-posix git
 
 git clone https://github.com/mgbowen/windows-fido-bridge.git
 cd windows-fido-bridge

cmake/BuildGoogleTest.cmake

@@ -22,8 +22,6 @@ add_subdirectory(${googletest_SOURCE_DIR} ${googletest_BINARY_DIR})
 if (MINGW)
     # When cross-compiling with MinGW, make the Google Test-generated
     # executables statically-linked to allow them to run with no extra DLLs.
-    include(BuildMingwStdThreads)
-
-    target_link_libraries(gtest PUBLIC -static mingw_stdthreads)
-    target_link_libraries(gtest_main PUBLIC -static mingw_stdthreads)
+    target_link_libraries(gtest PUBLIC -static)
+    target_link_libraries(gtest_main PUBLIC -static)
 endif()

cmake/BuildMingwStdThreads.cmake

@@ -1,5 +1,4 @@
 include(BuildFmt)
-include(BuildMingwStdThreads)
 
 include(FetchContent)
 
@@ -22,5 +21,5 @@ option(SPDLOG_FMT_EXTERNAL "" ON)
 add_subdirectory(${spdlog_SOURCE_DIR} ${spdlog_BINARY_DIR})
 
 if (MINGW)
-    target_link_libraries(spdlog PUBLIC mingw_stdthreads fmt)
+    target_link_libraries(spdlog PUBLIC fmt)
 endif()

cmake/BuildSpdlog.cmake

@@ -2,8 +2,8 @@ set(CMAKE_SYSTEM_NAME Windows)
 set(CMAKE_SYSTEM_PROCESSOR x86_64)
 
 set(prefix x86_64-w64-mingw32-)
-set(CMAKE_C_COMPILER ${prefix}gcc)
-set(CMAKE_CXX_COMPILER ${prefix}g++)
+set(CMAKE_C_COMPILER ${prefix}gcc-posix)
+set(CMAKE_CXX_COMPILER ${prefix}g++-posix)
 
 set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
 set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)