Work around MacOS compilation issue with embed stlib (#2255)

- The enable-stdlib-generator project is created with
  'kind = StaticLib' to allow the build to work, even though
  the project doesn't actually create a library.

- Unlike some other platforms, MacOs "ar" emits an error if no
  object files are listed to be added to an archive. This causes
  enable-stdlib-generator to fail on MacOS.

- Changing the project's kind to "SharedLib" works around the issue.
  Other values for kind do not seem to work around the issue.

- Add an optional flag to generatorProject to indicate that
  kind = "SharedLibrary" should be used, rather than "StaticLibrary"

- Add MacOS fix for SharedLibraryUtils::getSharedLibraryFileName().

- Enable embed stdlib in github_macos_build.sh

1 files changed, 8 insertions, 4 deletions

diff --git a/premake5.lua b/premake5.lua
index d59c03f90..9b985e29d 100644
--- a/premake5.lua
+++ b/premake5.lua
@@ -628,7 +628,7 @@ newoption {
  -- build items needed for other dependencies
  ---
  
- function generatorProject(name, sourcePath)
+ function generatorProject(name, sourcePath, isSharedLib)
      -- We use the `group` command here to specify that the
      -- next project we create shold be placed into a group
      -- named "generator" in a generated IDE solution/workspace.
@@ -642,9 +642,13 @@ newoption {
      -- Set up the project, but do NOT add any source files.
      baseSlangProject(name, sourcePath)
  
-     -- For now we just use static lib to force something
+     -- By default, just use static lib to force something
      -- to build.
-     kind "StaticLib"
+     if isSharedLib then
+         kind "SharedLib"
+     else
+        kind "StaticLib"
+    end
  end
  
  --
@@ -1222,7 +1226,7 @@ standardProject("slang-rt", "source/slang-rt")
  end
  
  if enableEmbedStdLib then
-     generatorProject("embed-stdlib-generator", nil)
+     generatorProject("embed-stdlib-generator", nil, true)
  
          -- We include these, even though they are not really part of the dummy
          -- build, so that the filters below can pick up the appropriate locations.