diff --git a/CMakeLists.txt b/CMakeLists.txt
index 01a07b0..4d43ebc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,9 @@ endif()
 if(NOT DEFINED CMAKE_CXX_STANDARD)
     set(CMAKE_CXX_STANDARD 11)
     set(CMAKE_CXX_STANDARD_REQUIRED ON)
-    set(CMAKE_CXX_EXTENSIONS OFF)
+    if(NOT CYGWIN)
+        set(CMAKE_CXX_EXTENSIONS OFF)
+    endif()
 endif()
 if(CMAKE_CXX_STANDARD LESS 11)
     message(FATAL_ERROR "CMAKE_CXX_STANDARD is less than 11, ghc::filesystem only works with C++11 and above.")
diff --git a/cmake/GhcHelper.cmake b/cmake/GhcHelper.cmake
index 78665d2..f7cdb52 100644
--- a/cmake/GhcHelper.cmake
+++ b/cmake/GhcHelper.cmake
@@ -29,6 +29,7 @@ if (CMAKE_COMPILER_IS_GNUCXX AND (CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL 8.0 O
     if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
         target_link_libraries(${targetName} -lstdc++fs)
     endif()
+    target_compile_options(${targetName} PRIVATE $<$<BOOL:${CYGWIN}>:-Wa,-mbig-obj>)
     target_compile_definitions(${targetName} PRIVATE USE_STD_FS)
 endif()
 
@@ -50,7 +51,8 @@ macro(AddTestExecutableWithStdCpp cppStd)
             $<$<BOOL:${EMSCRIPTEN}>:-s DISABLE_EXCEPTION_CATCHING=0>
             $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:-Wall -Wextra -Wshadow -Wconversion -Wsign-conversion -Wpedantic -Werror -Wno-error=deprecated-declarations>
             $<$<CXX_COMPILER_ID:GNU>:-Wall -Wextra -Wshadow -Wconversion -Wsign-conversion -Wpedantic -Wno-psabi -Werror -Wno-error=deprecated-declarations>
-            $<$<CXX_COMPILER_ID:MSVC>:/WX /wd4996>)
+            $<$<CXX_COMPILER_ID:MSVC>:/WX /wd4996>
+            $<$<BOOL:${CYGWIN}>:-Wa,-mbig-obj>)
     if(CMAKE_CXX_COMPILER_ID MATCHES MSVC)
         target_compile_definitions(filesystem_test_cpp${cppStd} PRIVATE _CRT_SECURE_NO_WARNINGS)
     endif()
diff --git a/include/ghc/filesystem.hpp b/include/ghc/filesystem.hpp
index e09bef3..12a67e3 100644
--- a/include/ghc/filesystem.hpp
+++ b/include/ghc/filesystem.hpp
@@ -65,6 +65,8 @@
 #elif defined(_WIN32)
 #define GHC_OS_WINDOWS
 #define GHC_OS_WIN32
+#elif defined(__CYGWIN__)
+#define GHC_OS_CYGWIN
 #elif defined(__svr4__)
 #define GHC_OS_SYS5R4
 #elif defined(BSD)
@@ -166,6 +168,9 @@
 #else
 #include <sys/statvfs.h>
 #endif
+#ifdef GHC_OS_CYGWIN
+#include <strings.h>
+#endif
 #if !defined(__ANDROID__) || __ANDROID_API__ >= 26
 #include <langinfo.h>
 #endif
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index a8ea09b..debe93a 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -21,7 +21,8 @@ else()
         $<$<BOOL:${EMSCRIPTEN}>:-s DISABLE_EXCEPTION_CATCHING=0>
         $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:-Wall -Wextra -Wshadow -Wconversion -Wsign-conversion -Wpedantic -Werror>
         $<$<CXX_COMPILER_ID:GNU>:-Wall -Wextra -Wshadow -Wconversion -Wsign-conversion -Wpedantic -Wno-psabi -Werror>
-        $<$<CXX_COMPILER_ID:MSVC>:/WX>)
+        $<$<CXX_COMPILER_ID:MSVC>:/WX>
+        $<$<BOOL:${CYGWIN}>:-Wa,-mbig-obj>)
     if(CMAKE_CXX_COMPILER_ID MATCHES MSVC)
         target_compile_definitions(filesystem_test PRIVATE _CRT_SECURE_NO_WARNINGS)
     endif()
@@ -60,6 +61,12 @@ add_test(multifile_test multifile_test)
 
 add_executable(fwd_impl_test fwd_test.cpp impl_test.cpp)
 target_link_libraries(fwd_impl_test ghc_filesystem)
+target_compile_options(fwd_impl_test PRIVATE
+        $<$<BOOL:${EMSCRIPTEN}>:-s DISABLE_EXCEPTION_CATCHING=0>
+        $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:-Wall -Wextra -Wshadow -Wconversion -Wsign-conversion -Wpedantic -Werror>
+        $<$<CXX_COMPILER_ID:GNU>:-Wall -Wextra -Wshadow -Wconversion -Wsign-conversion -Wpedantic -Wno-psabi -Werror>
+        $<$<CXX_COMPILER_ID:MSVC>:/WX>
+        $<$<BOOL:${CYGWIN}>:-Wa,-mbig-obj>)
 if(CMAKE_CXX_COMPILER_ID MATCHES MSVC)
     target_compile_definitions(fwd_impl_test PRIVATE _CRT_SECURE_NO_WARNINGS)
 endif()
@@ -70,3 +77,9 @@ if(NOT MSVC)
     target_compile_options(exception PRIVATE -fno-exceptions)
 endif()
 target_include_directories(exception PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../include)
+target_compile_options(exception PRIVATE
+        $<$<BOOL:${EMSCRIPTEN}>:-s DISABLE_EXCEPTION_CATCHING=0>
+        $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:-Wall -Wextra -Wshadow -Wconversion -Wsign-conversion -Wpedantic -Werror>
+        $<$<CXX_COMPILER_ID:GNU>:-Wall -Wextra -Wshadow -Wconversion -Wsign-conversion -Wpedantic -Wno-psabi -Werror>
+        $<$<CXX_COMPILER_ID:MSVC>:/WX>
+        $<$<BOOL:${CYGWIN}>:-Wa,-mbig-obj>)