flang-aarch64-ubuntu-clang: Refine the set-up for `-WError`
As this builder is primiarly used for testing Flang, use -WError only
when building Flang (as opposed to all of LLVM).
Differential Revision: https://reviews.llvm.org/D88811
diff --git a/buildbot/osuosl/master/config/builders.py b/buildbot/osuosl/master/config/builders.py
index 0272a18..3d35bd9 100644
--- a/buildbot/osuosl/master/config/builders.py
+++ b/buildbot/osuosl/master/config/builders.py
@@ -1522,7 +1522,8 @@
"-DCMAKE_CXX_COMPILER=/usr/bin/clang++-10",
"-DLLVM_INSTALL_UTILS=ON",
"-DCMAKE_CXX_STANDARD=17",
- "-DLLVM_ENABLE_WERROR=ON",
+ "-DLLVM_ENABLE_WERROR=OFF",
+ "-DFLANG_ENABLE_WERROR=ON",
"-DBUILD_SHARED_LIBS=ON",
"-DLLVM_ENABLE_ASSERTIONS=ON",
"-DLLVM_ENABLE_LIBCXX=On",