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/render-test/slang-support.cpp b/tools/render-test/slang-support.cpp
index d9d8ddb45..82d292cee 100644
--- a/tools/render-test/slang-support.cpp
+++ b/tools/render-test/slang-support.cpp
@@ -348,7 +348,11 @@ void ShaderCompilerUtil::Output::reset()
     fseek(sourceFile, 0, SEEK_SET);
 
     outSourceText.setCount(sourceSize + 1);
-    fread(outSourceText.getBuffer(), sourceSize, 1, sourceFile);
+    if(fread(outSourceText.getBuffer(), sourceSize, 1, sourceFile) != 1)
+    {
+        fprintf(stderr, "error: failed to read from '%s'\n", inSourcePath.getBuffer());
+        return SLANG_FAIL;
+    }
     fclose(sourceFile);
     outSourceText[sourceSize] = 0;