[builder][standalone-build] Allow for cmake tracing by setting CMAKE_TRACE

[kwk]

Summary

This adds a CMAKE_TRACE variable to the standaline-build.sh script in
zorg/buildbot/builders/annotated/ which allows you to toggle on cmake tracing.

zorg/buildbot/builders/annotated/standalone-build.sh

 
 BUILDBOT_ROOT=${BUILDBOT_ROOT:-${HERE}}
 REVISION=${BUILDBOT_REVISION:-origin/main}
 LLVM_ROOT="${BUILDBOT_ROOT}/llvm-project"
 BUILD_TYPE=Release
 INSTALL_ROOT_DIR=${BUILDBOT_ROOT}/install
 BUILD_ROOT_DIR=${BUILDBOT_ROOT}/build
 
+# Set CMAKE_TRACE=--trace to toggle on tracing of cmake calls to stderr
+CMAKE_TRACE=${CMAKE_TRACE:-}
+
 install_dir() {
     echo ${INSTALL_ROOT_DIR}/$1
 }
 
 build_dir() {
     echo ${BUILD_ROOT_DIR}/$1
 }
 
build_llvm() {
     local LLVM_BUILD_DIR=$(build_dir llvm)
     local LLVM_INSTALL_DIR=$(install_dir llvm)
 
     build_step "Sparse checkout out llvm"
     git -C "${LLVM_ROOT}" sparse-checkout set llvm cmake third-party
 
     build_step "Configuring llvm"
 
-    cmake \
+    cmake ${CMAKE_TRACE} \
         -S ${LLVM_ROOT}/llvm \
         -B ${LLVM_BUILD_DIR} \
         -G Ninja \
         -DCMAKE_BUILD_TYPE=${BUILD_TYPE} \
         -DLLVM_BUILD_LLVM_DYLIB=ON \
         -DLLVM_LINK_LLVM_DYLIB=ON \
         -DLLVM_INCLUDE_BENCHMARKS=OFF \
         -DLLVM_INSTALL_UTILS=ON \
         -DCMAKE_INSTALL_PREFIX=${LLVM_INSTALL_DIR} \
         -DLLVM_EXTERNAL_LIT=${PYTHON_LIT_INSTALL_DIR}/usr/local/bin/lit \
         -DLLVM_INCLUDE_UTILS:BOOL=ON \
         -DLLVM_INSTALL_UTILS:BOOL=ON \
         -DLLVM_UTILS_INSTALL_DIR:PATH=${LLVM_INSTALL_DIR}/bin \
         -DLLVM_CCACHE_BUILD=ON
 
     build_step "Building llvm"
-    cmake --build ${LLVM_BUILD_DIR}
+    cmake ${CMAKE_TRACE} --build ${LLVM_BUILD_DIR}
     
     build_step "Testing llvm"
-    LD_LIBRARY_PATH="${LLVM_INSTALL_DIR}/lib64" cmake --build ${LLVM_BUILD_DIR} --target check-all
+    LD_LIBRARY_PATH="${LLVM_INSTALL_DIR}/lib64" cmake ${CMAKE_TRACE} --build ${LLVM_BUILD_DIR} --target check-all
 
     build_step "Installing llvm"
     rm -rf ${LLVM_INSTALL_DIR}
-    cmake --install ${LLVM_BUILD_DIR}
+    cmake ${CMAKE_TRACE} --install ${LLVM_BUILD_DIR}
 
     # This is meant to extinguish any dependency on files being taken
     # from the llvm build dir when building clang.
     build_step "Removing llvm build dir"
     rm -rf "${LLVM_BUILD_DIR}"
 }
 
 build_clang() {
     local PYTHON_LIT_INSTALL_DIR=$(install_dir python-lit)
     local LLVM_INSTALL_DIR=$(install_dir llvm)
     local CLANG_BUILD_DIR=$(build_dir clang)
     local CLANG_INSTALL_DIR=$(install_dir clang)
 
     build_step "Sparse checkout out clang"
     git -C "${LLVM_ROOT}" sparse-checkout set clang cmake
 
     build_step "Configuring clang"
-    cmake \
+    cmake ${CMAKE_TRACE} \
         -S ${LLVM_ROOT}/clang \
         -B ${CLANG_BUILD_DIR} \
         -G Ninja \
         -DCMAKE_BUILD_TYPE=${BUILD_TYPE} \
         -DCLANG_LINK_CLANG_DYLIB=ON \
         -DCLANG_INCLUDE_TESTS=ON \
         -DLLVM_EXTERNAL_LIT=${PYTHON_LIT_INSTALL_DIR}/usr/local/bin/lit \
         -DCMAKE_INSTALL_PREFIX=${CLANG_INSTALL_DIR} \
         -DLLVM_ROOT=${LLVM_INSTALL_DIR} \
         -DLLVM_ENABLE_ASSERTIONS=ON \
         -DLLVM_TABLEGEN_EXE=${LLVM_INSTALL_DIR}/bin/llvm-tblgen \
         -DLLVM_CCACHE_BUILD=ON
 
     build_step "Building clang"
-    LD_LIBRARY_PATH="${LLVM_INSTALL_DIR}/lib64" cmake --build ${CLANG_BUILD_DIR}
+    LD_LIBRARY_PATH="${LLVM_INSTALL_DIR}/lib64" cmake ${CMAKE_TRACE} --build ${CLANG_BUILD_DIR}
 
     build_step "Installing clang"
     rm -rf ${CLANG_INSTALL_DIR}
-    cmake --install ${CLANG_BUILD_DIR}
+    cmake ${CMAKE_TRACE} --install ${CLANG_BUILD_DIR}
 
     build_step "Removing clang build dir"
     rm -rf ${CLANG_BUILD_DIR}
 }
 
 build_lld() {
     local LLVM_INSTALL_DIR=$(install_dir llvm)
     local PYTHON_LIT_INSTALL_DIR=$(install_dir python-lit)
build_lld() {
     # no sense when the llvm dir doesn't exist. Let's fix this by just providing
     # the empty llvm dir so that paths are resolved without errors.
     # TODO: I don't know how to fix this easily
     rm -rf "${LLVM_ROOT}"/llvm && mkdir "${LLVM_ROOT}"/llvm
     rm -rf ${LLD_INSTALL_DIR}
     rm -rf ${LLD_BUILD_DIR}
 
     build_step "Configuring lld"
-    cmake \
+    cmake ${CMAKE_TRACE} \
         -S ${LLVM_ROOT}/lld \
         -B ${LLD_BUILD_DIR} \
         -G Ninja \
         -DCMAKE_BUILD_TYPE=${BUILD_TYPE} \
         -DLLVM_LINK_LLVM_DYLIB=ON \
         -DCMAKE_INSTALL_PREFIX=${LLD_INSTALL_DIR} \
         -DLLVM_ROOT=${LLVM_INSTALL_DIR} \
         -DLLVM_CCACHE_BUILD=ON \
         -DLLVM_INCLUDE_TESTS=ON \
         -DLLVM_EXTERNAL_LIT=${PYTHON_LIT_INSTALL_DIR}/usr/local/bin/lit
 
     build_step "Building lld"
-    LD_LIBRARY_PATH="${LLVM_INSTALL_DIR}/lib64" cmake --build ${LLD_BUILD_DIR}
+    LD_LIBRARY_PATH="${LLVM_INSTALL_DIR}/lib64" cmake ${CMAKE_TRACE} --build ${LLD_BUILD_DIR}
 
     build_step "Testing lld"
-    LD_LIBRARY_PATH="${LLVM_INSTALL_DIR}/lib64" cmake --build ${LLD_BUILD_DIR} --target check-lld
+    LD_LIBRARY_PATH="${LLVM_INSTALL_DIR}/lib64" cmake ${CMAKE_TRACE} --build ${LLD_BUILD_DIR} --target check-lld
 
     build_step "Installing lld"
     rm -rf ${LLD_INSTALL_DIR}
-    cmake --install ${LLD_BUILD_DIR}
+    cmake ${CMAKE_TRACE} --install ${LLD_BUILD_DIR}
 
     build_step "Removing lld build dir"
     rm -rf ${LLD_BUILD_DIR}
 }
 
 setup_llvm_project
 pre_build_cleanup
 
 build_python_lit
 discover_python_lit
 build_llvm
 build_clang
 build_lld
 
 exit 0