**WIP**: Initial Cygwin build

* Cygwin is a platform that shares some similarities with MinGW and Linux. * Tested to pass the build with CMake. * Compiles all the test cases. However, most tests are failing for now.. Signed-off-by: Ookiineko <[email protected]>
ookiineko-cygport · Mar 16, 2024 · 78b76a0 · 78b76a0
1 parent 56d3f22
commit 78b76a0
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Showing 9 changed files with 23 additions and 11 deletions.
diff --git a/CMake/AbseilHelpers.cmake b/CMake/AbseilHelpers.cmake
@@ -433,6 +433,7 @@ function(absl_cc_test)
   endif()
   target_compile_options(${_NAME}
     PRIVATE ${ABSL_CC_TEST_COPTS}
+            $<$<BOOL:${CYGWIN}>:-Wa,-mbig-obj>
   )
 
   target_link_libraries(${_NAME}

diff --git a/absl/base/attributes.h b/absl/base/attributes.h
@@ -139,7 +139,7 @@
 #if (ABSL_HAVE_ATTRIBUTE(weak) ||                                         \
      (defined(__GNUC__) && !defined(__clang__))) &&                       \
     (!defined(_WIN32) || (defined(__clang__) && __clang_major__ >= 9)) && \
-    !defined(__MINGW32__)
+    !defined(__MINGW32__) && !defined(__CYGWIN__)
 #undef ABSL_ATTRIBUTE_WEAK
 #define ABSL_ATTRIBUTE_WEAK __attribute__((weak))
 #define ABSL_HAVE_ATTRIBUTE_WEAK 1

diff --git a/absl/base/config.h b/absl/base/config.h
@@ -416,7 +416,8 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
     defined(__asmjs__) || defined(__EMSCRIPTEN__) || defined(__Fuchsia__) || \
     defined(__sun) || defined(__ASYLO__) || defined(__myriad2__) ||          \
     defined(__HAIKU__) || defined(__OpenBSD__) || defined(__NetBSD__) ||     \
-    defined(__QNX__) || defined(__VXWORKS__) || defined(__hexagon__)
+    defined(__QNX__) || defined(__VXWORKS__) || defined(__hexagon__) ||      \
+    defined(__CYGWIN__)
 #define ABSL_HAVE_MMAP 1
 #endif
 
@@ -428,7 +429,7 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 #error ABSL_HAVE_PTHREAD_GETSCHEDPARAM cannot be directly set
 #elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
     defined(_AIX) || defined(__ros__) || defined(__OpenBSD__) ||          \
-    defined(__NetBSD__) || defined(__VXWORKS__)
+    defined(__NetBSD__) || defined(__VXWORKS__) || defined(__CYGWIN__)
 #define ABSL_HAVE_PTHREAD_GETSCHEDPARAM 1
 #endif
 
@@ -437,7 +438,7 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 // Checks whether sched_getcpu is available.
 #ifdef ABSL_HAVE_SCHED_GETCPU
 #error ABSL_HAVE_SCHED_GETCPU cannot be directly set
-#elif defined(__linux__)
+#elif defined(__linux__) || defined(__CYGWIN__)
 #define ABSL_HAVE_SCHED_GETCPU 1
 #endif
 
@@ -448,7 +449,7 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 #ifdef ABSL_HAVE_SCHED_YIELD
 #error ABSL_HAVE_SCHED_YIELD cannot be directly set
 #elif defined(__linux__) || defined(__ros__) || defined(__native_client__) || \
-    defined(__VXWORKS__)
+    defined(__VXWORKS__) || defined(__CYGWIN__)
 #define ABSL_HAVE_SCHED_YIELD 1
 #endif
 
@@ -463,7 +464,7 @@ static_assert(ABSL_INTERNAL_INLINE_NAMESPACE_STR[0] != 'h' ||
 // platforms.
 #ifdef ABSL_HAVE_SEMAPHORE_H
 #error ABSL_HAVE_SEMAPHORE_H cannot be directly set
-#elif defined(__linux__) || defined(__ros__) || defined(__VXWORKS__)
+#elif defined(__linux__) || defined(__ros__) || defined(__VXWORKS__) || defined(__CYGWIN__)
 #define ABSL_HAVE_SEMAPHORE_H 1
 #endif
 

diff --git a/absl/base/internal/raw_logging.cc b/absl/base/internal/raw_logging.cc
@@ -44,7 +44,7 @@
 #if defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) || \
     defined(__hexagon__) || defined(__Fuchsia__) ||                     \
     defined(__native_client__) || defined(__OpenBSD__) ||               \
-    defined(__EMSCRIPTEN__) || defined(__ASYLO__)
+    defined(__EMSCRIPTEN__) || defined(__ASYLO__) || defined(__CYGWIN__)
 
 #include <unistd.h>
 

diff --git a/absl/base/internal/sysinfo.cc b/absl/base/internal/sysinfo.cc
@@ -461,6 +461,10 @@ pid_t GetTID() {
   return reinterpret_cast<pid_t>(thread);
 }
 
+#elif defined(__CYGWIN__)
+
+pid_t GetTID() { return reinterpret_cast<pid_t>(pthread_self()); }
+
 #else
 
 // Fallback implementation of `GetTID` using `pthread_self`.

diff --git a/absl/base/internal/sysinfo.h b/absl/base/internal/sysinfo.h
@@ -57,6 +57,10 @@ int NumCPUs();
 // return types of GetProcessId() and GetThreadId() are both DWORD, an unsigned
 // 32-bit type.
 using pid_t = uint32_t;
+#elif defined(__CYGWIN__)
+// HACK: Shadowing the builtin pid_t type from the standard library.
+// pthread_t on Cygwin is a pointer type, but pid_t is an int.
+using pid_t = intptr_t;
 #endif
 pid_t GetTID();
 

diff --git a/absl/base/policy_checks.h b/absl/base/policy_checks.h
@@ -36,9 +36,6 @@
 // Operating System Check
 // -----------------------------------------------------------------------------
 
-#if defined(__CYGWIN__)
-#error "Cygwin is not supported."
-#endif
 
 // -----------------------------------------------------------------------------
 // Toolchain Check

diff --git a/absl/debugging/failure_signal_handler.cc b/absl/debugging/failure_signal_handler.cc
@@ -14,6 +14,11 @@
 // limitations under the License.
 //
 
+#ifdef __CYGWIN__
+// for sched_getcpu()
+#define _GNU_SOURCE
+#endif
+
 #include "absl/debugging/failure_signal_handler.h"
 
 #include "absl/base/config.h"

diff --git a/absl/log/stripping_test.cc b/absl/log/stripping_test.cc
@@ -170,7 +170,7 @@ class StrippingTest : public ::testing::Test {
   // Opens this program's executable file.  Returns `nullptr` and writes to
   // `stderr` on failure.
   std::unique_ptr<FILE, std::function<void(FILE*)>> OpenTestExecutable() {
-#if defined(__linux__)
+#if defined(__linux__) || defined(__CYGWIN__)
     std::unique_ptr<FILE, std::function<void(FILE*)>> fp(
         fopen("/proc/self/exe", "rb"), [](FILE* fp) { fclose(fp); });
     if (!fp) {