`slangc` tool experience improvements. (#4140)

* `slangc` tool experience improvements.

Fixes #4123.
Fixes #4127.

* Update doc.

3 files changed, 8 insertions, 2 deletions

diff --git a/docs/command-line-slangc-reference.md b/docs/command-line-slangc-reference.md
index c3a7b2ccd..1308f35fe 100644
--- a/docs/command-line-slangc-reference.md
+++ b/docs/command-line-slangc-reference.md
diff --git a/source/slang/slang-options.cpp b/source/slang/slang-options.cpp
index b6fcafb61..fc2fd42c2 100644
--- a/source/slang/slang-options.cpp
+++ b/source/slang/slang-options.cpp
@@ -386,8 +386,8 @@ void initCommandOptions(CommandOptions& options)
         { OptionKind::Optimization, "-O...", "-O<optimization-level>", "Set the optimization level."},
         { OptionKind::Obfuscate, "-obfuscate", nullptr, "Remove all source file information from outputs." },
         { OptionKind::GLSLForceScalarLayout,
-         "-force-glsl-scalar-layout", nullptr,
-         "Force using scalar block layout for uniform and shader storage buffers in GLSL output."},
+         "-force-glsl-scalar-layout,-fvk-use-scalar-layout", nullptr,
+         "Make data accessed through ConstantBuffer, ParameterBlock, StructuredBuffer, ByteAddressBuffer and general pointers follow the 'scalar' layout when targeting GLSL or SPIRV."},
         { OptionKind::VulkanBindShift, vkShiftNames.getBuffer(), "-fvk-<vulkan-shift>-shift <N> <space>", 
         "For example '-fvk-b-shift <N> <space>' shifts by N the inferred binding numbers for all resources in 'b' registers of space <space>. "
         "For a resource attached with :register(bX, <space>) but not [vk::binding(...)], "
diff --git a/source/slang/slang.cpp b/source/slang/slang.cpp
index 45a6933de..bebcd7fab 100644
--- a/source/slang/slang.cpp
+++ b/source/slang/slang.cpp
@@ -316,6 +316,12 @@ SlangResult Session::compileStdLib(slang::CompileStdLibFlags compileFlags)
         return SLANG_FAIL;
     }
 
+#ifdef _DEBUG
+    // Print a message in debug builds to notice the user that compiling the stdlib
+    // can take a while.
+    fprintf(stderr, "Compiling stdlib on debug build, this can take a while.\n");
+#endif
+
     // TODO(JS): Could make this return a SlangResult as opposed to exception
     StringBuilder stdLibSrcBuilder;
     stdLibSrcBuilder