Disable stdlib source via premake (#2259)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Added ability to compile slang without stdlib source. It's not requried if stdlib is available if embedded, or is a binary on the file system.

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

2 files changed, 22 insertions, 3 deletions

diff --git a/premake5.lua b/premake5.lua
index a1661e611..8b4348cfa 100644
--- a/premake5.lua
+++ b/premake5.lua
@@ -150,15 +150,23 @@ newoption {
      value       = "bool",
      default     = "true",
      allowed     = { { "true", "True"}, { "false", "False" } }
-  }
+ }
 
-  newoption {
+ newoption {
     trigger     = "enable-experimental-projects",
     description = "(Optional) If true include experimental projects in build.",
     value       = "bool",
     default     = "false",
     allowed     = { { "true", "True"}, { "false", "False" } }
-  }
+ }
+
+ newoption {
+    trigger     = "disable-stdlib-source",
+    description = "(Optional) If true stdlib source will not be included in binary.",
+    value       = "bool",
+    default     = "false",
+    allowed     = { { "true", "True"}, { "false", "False" } }
+ }
 
  buildLocation = _OPTIONS["build-location"]
  executeBinary = (_OPTIONS["execute-binary"] == "true")
@@ -171,6 +179,8 @@ newoption {
  enableEmbedStdLib = (_OPTIONS["enable-embed-stdlib"] == "true")
  enableXlib = (_OPTIONS["enable-xlib"] == "true")
  enableExperimental = (_OPTIONS["enable-experimental-projects"] == "true")
+ disableStdlibSource = (_OPTIONS["disable-stdlib-source"] == "true")
+ 
  -- Determine the target info
 
  targetInfo = slangUtil.getTargetInfo()
@@ -1304,6 +1314,10 @@ tool "slangd"
      --
      defines { "SLANG_DYNAMIC_EXPORT" }
  
+     if disableStdlibSource then
+        defines { "SLANG_DISABLE_STDLIB_SOURCE" }
+     end
+ 
      if enableEmbedStdLib then
          -- We only have this dependency if we are embedding stdlib
          dependson { "embed-stdlib-generator" }
diff --git a/source/slang/slang-stdlib.cpp b/source/slang/slang-stdlib.cpp
index e0727f19a..2bbf3c1c0 100644
--- a/source/slang/slang-stdlib.cpp
+++ b/source/slang/slang-stdlib.cpp
@@ -225,6 +225,7 @@ namespace Slang
 
     String Session::getCoreLibraryCode()
     {
+#if !defined(SLANG_DISABLE_STDLIB_SOURCE)
         if (coreLibraryCode.getLength() > 0)
             return coreLibraryCode;
 
@@ -235,11 +236,14 @@ namespace Slang
         #include "core.meta.slang.h"
 
         coreLibraryCode = sb.ProduceString();
+#endif
+
         return coreLibraryCode;
     }
 
     String Session::getHLSLLibraryCode()
     {
+#if !defined(SLANG_DISABLE_STDLIB_SOURCE)
         if (hlslLibraryCode.getLength() > 0)
             return hlslLibraryCode;
 
@@ -250,6 +254,7 @@ namespace Slang
         #include "hlsl.meta.slang.h"
 
         hlslLibraryCode = sb.ProduceString();
+#endif
         return hlslLibraryCode;
     }
 }