[Fix] Replace PWD with getcwd

PWD is not always the same as current working directory.

This is a problem when calling tests from ctest: the working directory
is changed, but the value of env::PWD is then incorrect.
Kernel files are then not found.

Using this system call the directory is correctly returned.

include/occa/io/utils.hpp

@@ -22,6 +22,8 @@ namespace occa {
     const std::string& cachePath();
     const std::string& libraryPath();
 
+    std::string currentWorkingDirectory();
+
     void endWithSlash(std::string &dir);
     std::string endWithSlash(const std::string &dir);
 

include/occa/tools/env.hpp

@@ -10,7 +10,7 @@ namespace occa {
   properties& settings();
 
   namespace env {
-    extern std::string HOME, PWD;
+    extern std::string HOME, CWD;
     extern std::string PATH, LD_LIBRARY_PATH;
 
     extern std::string OCCA_DIR, OCCA_CACHE_DIR;

src/io/utils.cpp

@@ -65,6 +65,16 @@ namespace occa {
       return path;
     }
 
+    std::string currentWorkingDirectory() {
+      char cwdBuff[FILENAME_MAX];
+#if (OCCA_OS == OCCA_WINDOWS_OS)
+      _getcwd(cwdBuff, sizeof(cwdBuff));
+#else
+      getcwd(cwdBuff, sizeof(cwdBuff));
+#endif
+      return endWithSlash(std::string(cwdBuff));
+    }
+
     void endWithSlash(std::string &dir) {
       const int chars = (int) dir.size();
       if ((0 < chars) &&
@@ -167,7 +177,7 @@ namespace occa {
       expFilename = fo.expand(expFilename);
 
       if (makeAbsolute && !isAbsolutePath(expFilename)) {
-        expFilename = env::PWD + expFilename;
+        expFilename = env::CWD + expFilename;
       }
       return expFilename;
     }

src/lang/preprocessor.cpp

@@ -1171,7 +1171,7 @@ namespace occa {
             header = path + header;
             break;
           } else if (i == (pathCount - 1)) {
-            header = env::PWD + header;
+            header = env::CWD + header;
           }
         }
       }

src/tools/env.cpp

@@ -17,7 +17,7 @@ namespace occa {
   }
 
   namespace env {
-    std::string HOME, PWD;
+    std::string HOME, CWD;
     std::string PATH, LD_LIBRARY_PATH;
 
     std::string OCCA_DIR, OCCA_CACHE_DIR;
@@ -72,15 +72,15 @@ namespace occa {
       // Standard environment variables
 #if (OCCA_OS & (OCCA_LINUX_OS | OCCA_MACOS_OS))
       HOME               = env::var("HOME");
-      PWD                = env::var("PWD");
+      CWD                = occa::io::currentWorkingDirectory();
       PATH               = env::var("PATH");
       LD_LIBRARY_PATH    = env::var("LD_LIBRARY_PATH");
 
       OCCA_CACHE_DIR     = env::var("OCCA_CACHE_DIR");
       OCCA_COLOR_ENABLED = env::get<bool>("OCCA_COLOR_ENABLED", true);
 
       io::endWithSlash(HOME);
-      io::endWithSlash(PWD);
+      io::endWithSlash(CWD);
       io::endWithSlash(PATH);
 #endif
 

tests/src/io/utils.cpp

@@ -87,7 +87,7 @@ void testPathMethods() {
             "b");
 
   ASSERT_EQ(occa::io::dirname("b.okl"),
-            occa::env::PWD);
+            occa::env::CWD);
   ASSERT_EQ(occa::io::dirname("/a/b.okl"),
             "/a/");
   ASSERT_EQ(occa::io::dirname("/a"),
@@ -143,7 +143,7 @@ void testDirMethods() {
 }
 
 void testIOMethods() {
-  const std::string test_foo = occa::env::PWD + "test_foo";
+  const std::string test_foo = occa::env::CWD + "test_foo";
 
   std::string content = "start";
   for (int i = 0; i < 100; ++i) {