cmake: fix paths for vulkan shaders compilation on Windows (#8573)

* Vulkan-shaders: attempt fix compilation on windows

* fix miss-matched parenthesis

ggml/src/vulkan-shaders/vulkan-shaders-gen.cpp

@@ -179,11 +179,7 @@ bool string_ends_with(const std::string& str, const std::string& suffix) {
     return std::equal(suffix.rbegin(), suffix.rend(), str.rbegin());
 }
 
-#ifdef _WIN32
-    static const char path_separator = '\\';
-#else
-    static const char path_separator = '/';
-#endif
+static const char path_separator = '/';
 
 std::string join_paths(const std::string& path1, const std::string& path2) {
     return path1 + path_separator + path2;
@@ -198,7 +194,11 @@ void string_to_spv(const std::string& _name, const std::string& in_fname, const
     std::string out_fname = join_paths(output_dir, name + ".spv");
     std::string in_path = join_paths(input_dir, in_fname);
 
-    std::vector<std::string> cmd = {GLSLC, "-fshader-stage=compute", "--target-env=vulkan1.2", "-O", in_path, "-o", out_fname};
+    #ifdef _WIN32
+        std::vector<std::string> cmd = {GLSLC, "-fshader-stage=compute", "--target-env=vulkan1.2", "-O", "\"" + in_path + "\"", "-o", "\"" + out_fname + "\""};
+    #else
+        std::vector<std::string> cmd = {GLSLC, "-fshader-stage=compute", "--target-env=vulkan1.2", "-O", in_path, "-o",  out_fname};
+    #endif
     for (const auto& define : defines) {
         cmd.push_back("-D" + define.first + "=" + define.second);
     }
@@ -482,10 +482,16 @@ void write_output_files() {
 
     for (const auto& pair : shader_fnames) {
         const std::string& name = pair.first;
-        const std::string& path = pair.second;
+        #ifdef _WIN32
+            std::string path = pair.second;
+            std::replace(path.begin(), path.end(), '/', '\\' );
+        #else
+            const std::string& path = pair.second;
+        #endif
+
         FILE* spv = fopen(path.c_str(), "rb");
         if (!spv) {
-            std::cerr << "Error opening SPIR-V file: " << path << "\n";
+            std::cerr << "Error opening SPIR-V file: " << path << " (" << strerror(errno) << ")\n";
             continue;
         }
 
@@ -497,7 +503,7 @@ void write_output_files() {
         size_t read_size = fread(data.data(), 1, size, spv);
         fclose(spv);
         if (read_size != size) {
-            std::cerr << "Error reading SPIR-V file: " << path << "\n";
+            std::cerr << "Error reading SPIR-V file: " << path << " (" << strerror(errno) << ")\n";
             continue;
         }