Bug 1812974 - Remove cctools dependency for clang toolchains. r=firefox-build-system-reviewers,ahochheiden

The non-raw clang toolchains do still need cctools for lipo when
aggregating the compiler-rts.

Differential Revision: https://phabricator.services.mozilla.com/D168034

build/build-clang/build-clang.py

@@ -661,7 +661,11 @@ def main():
         extra_cflags2 = []
         extra_cxxflags2 = []
         extra_asmflags = []
+        # It's unfortunately required to specify the linker used here because
+        # the linker flags are used in LLVM's configure step before
+        # -DLLVM_ENABLE_LLD is actually processed.
         extra_ldflags = [
+            "-fuse-ld=lld",
             "-Wl,-dead_strip",
         ]
     elif is_linux(target):

taskcluster/ci/toolchain/clang-tidy.yml

@@ -58,7 +58,6 @@ macosx64-clang-tidy:
             - 'build/build-clang/macosx64.json'
     fetches:
         toolchain:
-            - linux64-cctools-port
             - linux64-clang-15
             - macosx64-sdk-toolchain
 
@@ -80,7 +79,6 @@ macosx64-arch64-clang-tidy:
             - 'build/build-clang/macosx64-aarch64.json'
     fetches:
         toolchain:
-            - linux64-cctools-port
             - linux64-clang-15
             - macosx64-sdk-toolchain
 

taskcluster/ci/toolchain/clang.yml

@@ -92,7 +92,6 @@ macosx64-clang-14-raw:
         fetch:
             - clang-14
         toolchain:
-            - linux64-cctools-port
             - linux64-clang-14-stage1
             - macosx64-sdk-toolchain
 
@@ -277,7 +276,6 @@ macosx64-clang-15-raw:
         fetch:
             - clang-15
         toolchain:
-            - linux64-cctools-port
             - linux64-clang-15-stage1
             - linux64-clang-15-profile
             - macosx64-sdk-toolchain
@@ -344,7 +342,6 @@ macosx64-aarch64-clang-15-raw:
         fetch:
             - clang-15
         toolchain:
-            - linux64-cctools-port
             - linux64-clang-15-stage1
             - linux64-clang-15-profile
             - macosx64-sdk-toolchain
@@ -665,7 +662,6 @@ macosx64-clang-trunk-raw:
         fetch:
             - clang-trunk
         toolchain:
-            - linux64-cctools-port
             - linux64-clang-trunk-stage1
             - linux64-clang-trunk-profile
             - macosx64-sdk-toolchain
@@ -734,7 +730,6 @@ macosx64-aarch64-clang-trunk-raw:
         fetch:
             - clang-trunk
         toolchain:
-            - linux64-cctools-port
             - linux64-clang-trunk-stage1
             - linux64-clang-trunk-profile
             - macosx64-sdk-toolchain