Ignore failure to fetch webgpu_dawn and slang-tint (#6689)

* Ignore failure to fetch webgpu_dawn and slang-tint

Fixes #6683

* format code

---------

Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 224bd3c29..5471852a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -369,15 +369,25 @@ add_subdirectory(external)
 
 # webgpu_dawn is only available as a fetched shared library, since Dawn's nested source
 # trees are too large and onerous for us to depend on.
+# We ignore the failure to fetch the library, since it's not required for the build to succeed.
 if(SLANG_WEBGPU_DAWN_BINARY_URL)
-    copy_fetched_shared_library("webgpu_dawn" "${SLANG_WEBGPU_DAWN_BINARY_URL}")
+    copy_fetched_shared_library(
+        "webgpu_dawn"
+        "${SLANG_WEBGPU_DAWN_BINARY_URL}"
+        IGNORE_FAILURE
+    )
 endif()
 
 # slang-tint is only available as a fetched shared library, since it's hosted in the Dawn
 # repository, and Dawn's nested source trees are too large and onerous for us to depend
 # on.
+# We ignore the failure to fetch the library, since it's not required for the build to succeed.
 if(SLANG_SLANG_TINT_BINARY_URL)
-    copy_fetched_shared_library("slang-tint" "${SLANG_SLANG_TINT_BINARY_URL}")
+    copy_fetched_shared_library(
+        "slang-tint"
+        "${SLANG_SLANG_TINT_BINARY_URL}"
+        IGNORE_FAILURE
+    )
 endif()
 
 fetch_or_build_slang_llvm()