The flags F_OK, R_OK and W_OK are defined in unistd.h, which does not exist under the Windows platform. Windows still defines the `access` function. Its access flags are documented at https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/access-waccess. For compatibility, define the flags F_OK, R_OK and W_OK using these constants.
This patch is part of the series to make flang compilable with MS Visual Studio <http://lists.llvm.org/pipermail/flang-dev/2020-July/000448.html>.
Reviewed By: klausler
Differential Revision: https://reviews.llvm.org/D88508
bool IsATerminal(int fd) { return ::isatty(fd); }
+#ifdef WIN32
+// Access flags are normally defined in unistd.h, which unavailable under
+// Windows. Instead, define the flags as documented at
+// https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/access-waccess
+#define F_OK 00
+#define W_OK 02
+#define R_OK 04
+#endif
+
bool IsExtant(const char *path) { return ::access(path, F_OK) == 0; }
bool MayRead(const char *path) { return ::access(path, R_OK) == 0; }
bool MayWrite(const char *path) { return ::access(path, W_OK) == 0; }