add mingw support (#468)

Signed-off-by: U-CW01\uig08771 <[email protected]>
(cherry picked from commit 826cd46)

Author: felixf4xu

include/rcutils/macros.h

@@ -22,11 +22,11 @@ extern "C"
 {
 #endif
 
-#ifndef _WIN32
+#ifndef _MSC_VER
 /// A macro to make the compiler warn when the return value of a function is not used.
 #define RCUTILS_WARN_UNUSED __attribute__((warn_unused_result))
 #else
-/// A macro to make the compiler warn when the return value of a function is not used.
+/// A macro to make the compiler (MSVC) warn when the return value of a function is not used.
 #define RCUTILS_WARN_UNUSED _Check_return_
 #endif
 

include/rcutils/stdatomic_helper.h

@@ -27,7 +27,7 @@
 # endif
 #endif
 
-#if !defined(_WIN32)
+#if !defined(_WIN32) || defined(__MINGW64__)
 
 // The my__has_feature avoids a preprocessor error when you check for it and
 // use it on the same line below.

src/process.c

@@ -60,7 +60,7 @@ char * rcutils_get_executable_name(rcutils_allocator_t allocator)
 
 #if defined __APPLE__ || defined __FreeBSD__ || (defined __ANDROID__ && __ANDROID_API__ >= 21)
   const char * appname = getprogname();
-#elif defined __GNUC__ && !defined(__QNXNTO__) && !defined(__OHOS__)
+#elif (defined __GNUC__ && !defined(__MINGW64__)) && !defined(__QNXNTO__) && !defined(__OHOS__)
   const char * appname = program_invocation_name;
 #elif defined _WIN32 || defined __CYGWIN__
   char appname[MAX_PATH];
@@ -85,7 +85,7 @@ char * rcutils_get_executable_name(rcutils_allocator_t allocator)
   }
 
   // Get just the executable name (Unix may return the absolute path)
-#if defined __APPLE__ || defined __FreeBSD__ || defined __GNUC__
+#if defined __APPLE__ || defined __FreeBSD__ || (defined __GNUC__ && !defined(__MINGW64__))
   // We need an intermediate copy because basename may modify its arguments
   char * intermediate = rcutils_strdup(appname, allocator);
   if (NULL == intermediate) {

test/test_process.cpp

@@ -33,7 +33,7 @@ TEST(TestProcess, test_get_executable_name) {
   EXPECT_STREQ(NULL, rcutils_get_executable_name(time_bomb_allocator));
 
   // Allocating intermediate fails. This allocation doesn't happen on windows
-#if defined __APPLE__ || defined __FreeBSD__ || defined __GNUC__
+#if defined __APPLE__ || defined __FreeBSD__ || (defined __GNUC__ && !defined(__MINGW64__))
   set_time_bomb_allocator_malloc_count(time_bomb_allocator, 1);
   EXPECT_STREQ(NULL, rcutils_get_executable_name(time_bomb_allocator));
 #endif