llvm: update 3.4 --> 7.0.0

requires c++11 compiler (posix toolchain)

closes #1000 fixes #2106

src/llvm-1-fixes.patch

@@ -0,0 +1,32 @@
+This file is part of MXE. See LICENSE.md for licensing information.
+
+Contains ad hoc patches for cross building.
+
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Tony Theodore <tonyt@logyst.com>
+Date: Sun, 9 Dec 2018 16:04:13 +1100
+Subject: [PATCH 1/1] fix shared build and install
+
+
+diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
+index 1111111..2222222 100644
+--- a/cmake/modules/AddLLVM.cmake
++++ b/cmake/modules/AddLLVM.cmake
+@@ -656,7 +656,7 @@ macro(add_llvm_library name)
+ 
+       install(TARGETS ${name}
+               ${export_to_llvmexports}
+-              ${install_type} DESTINATION ${install_dir}
++              DESTINATION lib RUNTIME DESTINATION bin
+               COMPONENT ${name})
+ 
+       if (NOT CMAKE_CONFIGURATION_TYPES)
+diff --git a/lib/Testing/CMakeLists.txt b/lib/Testing/CMakeLists.txt
+index 1111111..2222222 100644
+--- a/lib/Testing/CMakeLists.txt
++++ b/lib/Testing/CMakeLists.txt
+@@ -1 +1,3 @@
+-add_subdirectory(Support)
++if( LLVM_INCLUDE_TESTS )
++  add_subdirectory(Support)
++endif()

src/llvm.mk

@@ -3,12 +3,15 @@
 PKG             := llvm
 $(PKG)_WEBSITE  := https://llvm.org/
 $(PKG)_IGNORE   :=
-$(PKG)_VERSION  := 3.4
-$(PKG)_CHECKSUM := 25a5612d692c48481b9b397e2b55f4870e447966d66c96d655241702d44a2628
-$(PKG)_SUBDIR   := llvm-$($(PKG)_VERSION)
-$(PKG)_FILE     := llvm-$($(PKG)_VERSION).src.tar.gz
+$(PKG)_VERSION  := 7.0.0
+$(PKG)_CHECKSUM := 8bc1f844e6cbde1b652c19c1edebc1864456fd9c78b8c1bea038e51b363fe222
+$(PKG)_SUBDIR   := llvm-$($(PKG)_VERSION).src
+$(PKG)_FILE     := llvm-$($(PKG)_VERSION).src.tar.xz
 $(PKG)_URL      := https://releases.llvm.org/$($(PKG)_VERSION)/$($(PKG)_FILE)
-$(PKG)_DEPS     := cc
+$(PKG)_DEPS     := cc $(BUILD)~$(PKG)
+# requires posix toolchain
+$(PKG)_TARGETS  := $(BUILD) $(foreach TGT,$(MXE_TARGETS),$(and $(findstring posix,$(TGT)),$(TGT)))
+$(PKG)_DEPS_$(BUILD) := cmake
 
 define $(PKG)_UPDATE
     $(WGET) -q -O- 'https://releases.llvm.org/download.html' | \
@@ -18,11 +21,34 @@ define $(PKG)_UPDATE
 endef
 
 define $(PKG)_BUILD
-    mkdir '$(1)/build'
-    cd '$(1)/build' && '$(TARGET)-cmake' .. \
-        -DLLVM_BUILD_TOOLS=OFF
-    $(MAKE) -C '$(1)/build' -j $(JOBS) llvm-tblgen
-    $(MAKE) -C '$(1)/build' -j $(JOBS) intrinsics_gen
-    $(MAKE) -C '$(1)/build' -j $(JOBS) install
-    cp '$(1)'/build/bin/*.dll '$(PREFIX)/$(TARGET)/bin/'
+    cd '$(BUILD_DIR)' && $(TARGET)-cmake '$(SOURCE_DIR)' \
+        -DLLVM_TABLEGEN='$(PREFIX)/$(BUILD)/bin/llvm-tblgen' \
+        -DLLVM_TARGETS_TO_BUILD=X86 \
+        -DLLVM_TARGET_ARCH=X86 \
+        -DLLVM_BUILD_DOCS=OFF \
+        -DLLVM_BUILD_EXAMPLES=OFF \
+        -DLLVM_BUILD_RUNTIME=OFF \
+        -DLLVM_BUILD_RUNTIMES=OFF \
+        -DLLVM_BUILD_TESTS=OFF \
+        -DLLVM_BUILD_TOOLS=OFF \
+        -DLLVM_BUILD_UTILS=OFF \
+        -DLLVM_ENABLE_BINDINGS=OFF \
+        -DLLVM_ENABLE_DOXYGEN=OFF \
+        -DLLVM_ENABLE_OCAMLDOC=OFF \
+        -DLLVM_ENABLE_SPHINX=OFF \
+        -DLLVM_INCLUDE_DOCS=OFF \
+        -DLLVM_INCLUDE_EXAMPLES=OFF \
+        -DLLVM_INCLUDE_GO_TESTS=OFF \
+        -DLLVM_INCLUDE_RUNTIMES=OFF \
+        -DLLVM_INCLUDE_TESTS=OFF \
+        -DLLVM_INCLUDE_TOOLS=OFF \
+        -DLLVM_INCLUDE_UTILS=OFF
+    $(MAKE) -C '$(BUILD_DIR)' -j '$(JOBS)' VERBOSE=1
+    $(MAKE) -C '$(BUILD_DIR)' -j 1 install
+endef
+
+define $(PKG)_BUILD_$(BUILD)
+    cd '$(BUILD_DIR)' && cmake '$(SOURCE_DIR)'
+    $(MAKE) -C '$(BUILD_DIR)' -j '$(JOBS)' llvm-tblgen VERBOSE=1
+    cp '$(BUILD_DIR)'/bin/* '$(PREFIX)/$(TARGET)/bin/'
 endef