cctools: fixup building with LTO

Use lto.h from clang+llvm not libtapi. The later is older,
and comes bundled with the libtapi repo.

Copy libLTO.so when building with FORCE_USE_SYSTEM_CLANG.

Author: fanquake

depends/hosts/darwin.mk

@@ -17,6 +17,7 @@ darwin_native_toolchain=native_cctools
 
 clang_prog=$(build_prefix)/bin/clang
 clangxx_prog=$(clang_prog)++
+llvm_config_prog=$(build_prefix)/bin/llvm-config
 
 clang_resource_dir=$(build_prefix)/lib/clang/$(native_clang_version)
 else
@@ -34,8 +35,10 @@ darwin_native_toolchain=
 # Source: https://lists.gnu.org/archive/html/bug-make/2017-11/msg00017.html
 clang_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang")
 clangxx_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v clang++")
+llvm_config_prog=$(shell $(SHELL) $(.SHELLFLAGS) "command -v llvm-config")
 
 clang_resource_dir=$(shell clang -print-resource-dir)
+llvm_lib_dir=$(shell $(llvm_config_prog) --libdir)
 endif
 
 cctools_TOOLS=AR RANLIB STRIP NM LIBTOOL OTOOL INSTALL_NAME_TOOL DSYMUTIL

depends/packages/native_cctools.mk

@@ -16,9 +16,17 @@ define $(package)_set_vars
   $(package)_cxx=$(clangxx_prog)
 endef
 
+ifneq ($(strip $(FORCE_USE_SYSTEM_CLANG)),)
 define $(package)_preprocess_cmds
+  mkdir -p $($(package)_staging_prefix_dir)/lib && \
+  cp $(llvm_lib_dir)/libLTO.so $($(package)_staging_prefix_dir)/lib/ && \
   cp -f $(BASEDIR)/config.guess $(BASEDIR)/config.sub cctools
 endef
+else
+define $(package)_preprocess_cmds
+  cp -f $(BASEDIR)/config.guess $(BASEDIR)/config.sub cctools
+endef
+endif
 
 define $(package)_config_cmds
   $($(package)_autoconf)

depends/packages/native_clang.mk

@@ -16,10 +16,13 @@ endef
 define $(package)_stage_cmds
   mkdir -p $($(package)_staging_prefix_dir)/lib/clang/$($(package)_version)/include && \
   mkdir -p $($(package)_staging_prefix_dir)/bin && \
+  mkdir -p $($(package)_staging_prefix_dir)/include/llvm-c && \
   cp bin/clang $($(package)_staging_prefix_dir)/bin/ && \
   cp -P bin/clang++ $($(package)_staging_prefix_dir)/bin/ && \
   cp bin/dsymutil $($(package)_staging_prefix_dir)/bin/$(host)-dsymutil && \
   cp bin/llvm-config $($(package)_staging_prefix_dir)/bin/ && \
+  cp include/llvm-c/ExternC.h $($(package)_staging_prefix_dir)/include/llvm-c && \
+  cp include/llvm-c/lto.h $($(package)_staging_prefix_dir)/include/llvm-c && \
   cp lib/libLTO.so $($(package)_staging_prefix_dir)/lib/ && \
   cp -r lib/clang/$($(package)_version)/include/* $($(package)_staging_prefix_dir)/lib/clang/$($(package)_version)/include/
 endef

depends/packages/native_libtapi.mk

@@ -13,7 +13,5 @@ define $(package)_build_cmds
 endef
 
 define $(package)_stage_cmds
-  ./install.sh && \
-  mkdir -p $($(package)_staging_prefix_dir)/include/llvm-c && \
-  cp src/llvm/include/llvm-c/lto.h $($(package)_staging_prefix_dir)/include/llvm-c
+  ./install.sh
 endef