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, 2 insertions, 1 deletions

diff --git a/source/core/slang-io.cpp b/source/core/slang-io.cpp
index 8a2243b15..4ef5ecc2d 100644
--- a/source/core/slang-io.cpp
+++ b/source/core/slang-io.cpp
@@ -126,7 +126,8 @@ namespace Slang
         List<char> buffer;
         auto copySize = builder.getLength();
         buffer.setCount(copySize + 1);
-        SLANG_ASSERT(copySize < PTRDIFF_MAX); // Shhh gcc, it's ok, we're not copying 9000 Petabytes
+        // Satisfy GCC
+        SLANG_ASSUME(copySize < PTRDIFF_MAX && copySize > 0);
         ::memcpy(buffer.getBuffer(), builder.getBuffer(), copySize);
         buffer[copySize] = 0;