Windows build support (#71)

Windows build support

* MSVC: Ensure CRT is statically linked into executables

* Use fopen_s on Windows to avoid security warning

* Use std::strtoull and include its header

* Use #if defined(_MSC_VER)

1 files changed, 6 insertions, 1 deletions

diff --git a/samples/amber.cc b/samples/amber.cc
index d5a5d94..b03a3da 100644
--- a/samples/amber.cc
+++ b/samples/amber.cc
@@ -112,7 +112,12 @@ bool ParseArgs(const std::vector<std::string>& args, Options* opts) {
 }
 
 std::string ReadFile(const std::string& input_file) {
-  FILE* file = fopen(input_file.c_str(), "rb");
+  FILE* file = nullptr;
+#if defined(_MSC_VER)
+  fopen_s(&file, input_file.c_str(), "rb");
+#else
+  file = fopen(input_file.c_str(), "rb");
+#endif
   if (!file) {
     std::cerr << "Failed to open " << input_file << std::endl;
     return {};