llvm: bump to version 18 rc2 to fix the frontend bug with openmp

LLVM.makefile

@@ -173,6 +173,7 @@ LIBCXX_CMAKE_FLAGS = \
 	-DLIBCXXABI_HAS_EXTERNAL_THREAD_API:BOOL=OFF \
 	-DLIBCXXABI_BUILD_EXTERNAL_THREAD_LIBRARY:BOOL=OFF \
 	-DLIBCXXABI_HAS_WIN32_THREAD_API:BOOL=OFF \
+	-DLIBCXXABI_USE_LLVM_UNWINDER=OFF \
 	-DLIBCXX_ENABLE_PIC:BOOL=$(2) \
 	-DUNIX:BOOL=ON \
 	--debug-trycompile

docker/llvm.dockerfile

@@ -21,8 +21,10 @@ RUN apt update \
     && apt install -y \
         autoconf \
         build-essential \
-        # This clang version is needed to help us build LLVM from source below
-        clang-${LLVM_VERSION_MAJOR} \
+        # This clang version is needed to help us build LLVM from source below.
+        # Pin it to one number as it can drift away from the WASM-compiling
+        # LLVM version
+        clang-17 \
         curl \
         git \
         gpg \

faasmtools/env.py

@@ -13,7 +13,8 @@
 VERSION_FILE = join(PROJ_ROOT, "VERSION")
 
 # LLVM variables
-LLVM_VERSION = "17.0.6"
+# LLVM_VERSION = "17.0.6"
+LLVM_VERSION = "18.1.0-rc2"
 LLVM_DIR = join("/opt", "llvm-project")
 LLVM_MAKEFILE = join(PROJ_ROOT, "LLVM.makefile")
 WASI_LIBC_DIR = join(THIRD_PARTY_DIR, "wasi-libc")

tasks/llvm.py

@@ -43,12 +43,6 @@ def do_llvm_clone():
     git_cmd = " ".join(git_cmd)
     run(git_cmd, shell=True, check=True)
 
-    # TODO: do we even need this patch anymore?
-    # llvm_patches_dir = join(PATCHES_DIR, "llvm-project")
-    # for patch in listdir(llvm_patches_dir):
-    # git_cmd = "git apply {}".format(join(llvm_patches_dir, patch))
-    # run(git_cmd, shell=True, check=True, cwd=LLVM_DIR)
-
 
 def do_llvm_build(target, clean_target=None):
     build_env = environ.copy()