Fix warnings for gcc 12.3 (#3286)

* Silence a few gcc out of bounds warnings

* Search upwards from executable for prelude directory instead of assuming depth

* comment wording

* Check return values of read and write

* Correct path to vulkan headers in gfx

* Correct diagnostic on missing file in slang-embed

* Do not use absolute path to libraries in test-context.cpp

---------

Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/tools/slang-generate/main.cpp b/tools/slang-generate/main.cpp
index 7d07cd613..af81385dd 100644
--- a/tools/slang-generate/main.cpp
+++ b/tools/slang-generate/main.cpp
@@ -809,7 +809,11 @@ SourceFile* parseSourceFile(const String& path)
     fseek(inputStream, 0, SEEK_SET);
 
     char* input = (char*)malloc(inputSize + 1);
-    fread(input, inputSize, 1, inputStream);
+    if(fread(input, inputSize, 1, inputStream) != 1)
+    {
+        fprintf(stderr, "unable to read input file: %s\n", path.getBuffer());
+        return nullptr;
+    }
     input[inputSize] = 0;
 
     char const* inputEnd = input + inputSize;