From e714f232748c08eee438c7722cf78e0e1999a2f7 Mon Sep 17 00:00:00 2001
From: Michal Sojka <michal.sojka@cvut.cz>
Date: Thu, 10 May 2018 22:42:23 +0200
Subject: [PATCH] Build native *-tblgen during cross builds

For some reason, LLVM buildsystem does treat our crossbuilds as native
builds. Perhaps because we use qemu-user-static to allow running cross
binaries. To build everything correcly, native tblgen binaries are
needed.

This commit build native tblgen binaries and uses them for the cross
build.
---
 Makefile | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index ef0edf3..938764d 100644
--- a/Makefile
+++ b/Makefile
@@ -14,11 +14,14 @@ llvm/tools/clang:
 llvm/projects/openmp:
 	ln -s ../../openmp $@
 
-build build_passes:
+build build_passes build_native:
 	mkdir $@
 
 ifneq ($(DEB_HOST_GNU_TYPE),$(DEB_BUILD_GNU_TYPE))
 
+LLVM_TBLGEN=$(CURDIR)/build_native/bin/llvm-tblgen
+CLANG_TBLGEN=$(CURDIR)/build_native/bin/clang-tblgen
+
 LLVM_CROSS_FLAGS += -DCMAKE_C_COMPILER=$(DEB_HOST_GNU_TYPE)-gcc
 LLVM_CROSS_FLAGS += -DCMAKE_CXX_COMPILER=$(DEB_HOST_GNU_TYPE)-g++
 LLVM_CROSS_FLAGS += -DCMAKE_SYSTEM_PROCESSOR=$(DEB_HOST_GNU_CPU)
@@ -28,9 +31,23 @@ LLVM_CROSS_FLAGS += -DCMAKE_CROSSCOMPILING=True
 ## arm64 binaries on x86
 # LLVM_CROSS_FLAGS += -DLLVM_TABLEGEN="<path-to-host-bin>/llvm-tblgen"
 # LLVM_CROSS_FLAGS += -DCLANG_TABLEGEN="<path-to-host-bin>/clang-tblgen"
+LLVM_CROSS_FLAGS += -DLLVM_TABLEGEN="$(LLVM_TBLGEN)"
+LLVM_CROSS_FLAGS += -DCLANG_TABLEGEN="$(CLANG_TBLGEN)"
 LLVM_CROSS_FLAGS += -DLLVM_DEFAULT_TARGET_TRIPLE=$(DEB_HOST_GNU_TYPE)
 LLVM_CROSS_FLAGS += -DLLVM_TARGET_ARCH=$(DEB_TARGET_GNU_CPU)
 #LLVM_CROSS_FLAGS += -DLLVM_TARGETS_TO_BUILD=$(shell echo $(DEB_HOST_ARCH)|tr '[:lower:]' '[:upper:]')
+
+build/build.ninja: | $(LLVM_TBLGEN) $(CLANG_TBLGEN)
+
+$(LLVM_TBLGEN) $(CLANG_TBLGEN): | build_native/build.ninja
+	ninja -C build_native bin/llvm-tblgen bin/clang-tblgen
+
+build_native/build.ninja: | build_native
+	cd $(@D) && cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="$(PREFIX)" \
+		-DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_BACKTRACES=ON -DLLVM_ENABLE_WERROR=OFF \
+		-DBUILD_SHARED_LIBS=OFF -DLLVM_ENABLE_RTTI=ON \
+		-DCMAKE_CXX_FLAGS='-DHERCULES_PASS_ROOT=\"$(PREFIX)/lib/hercules\"' \
+		-G "Ninja" $(CURDIR)/llvm
 endif
 
 
-- 
2.39.2