Build of dtc with clang_glibc toolchain

# [tuscan]
# Server = file:///var/cache/pacman/pkg/

# :: Synchronizing package databases...
# downloading tuscan.db...

# /toolchain_root/sysroot --> /sysroot/sysroot
# /toolchain_root/lib --> /sysroot/lib
# /toolchain_root/sbin --> /sysroot/sbin
# /toolchain_root/lib64 --> /sysroot/lib64
# /toolchain_root/etc --> /sysroot/etc
# /toolchain_root/share --> /sysroot/share
# /toolchain_root/bin --> /sysroot/bin
# /toolchain_root/var --> /sysroot/var
# /toolchain_root/usr --> /sysroot/usr
# /toolchain_root/glibc-build --> /sysroot/glibc-build
# /toolchain_root/x86_64-pc-linux-gnu --> /sysroot/x86_64-pc-linux-gnu
# /toolchain_root/include --> /sysroot/include
# /toolchain_root/libexec --> /sysroot/libexec

# ==> Making package: dtc 1.4.1-1 (Thu Apr 13 12:46:18 UTC 2017)
# ==> Checking runtime dependencies...
# ==> Checking buildtime dependencies...
# ==> WARNING: Using existing $srcdir/ tree
# ==> Starting build()...
# DEP tests/dumptrees.c
# DEP tests/trees.S
# DEP tests/testutils.c
# DEP tests/value-labels.c
# DEP tests/asm_tree_dump.c
# DEP tests/truncated_property.c
# DEP tests/subnode_iterate.c
# DEP tests/integer-expressions.c
# DEP tests/utilfdt_test.c
# DEP tests/path_offset_aliases.c
# DEP tests/add_subnode_with_nops.c
# DEP tests/dtbs_equal_unordered.c
# DEP tests/dtb_reverse.c
# DEP tests/dtbs_equal_ordered.c
# DEP tests/extra-terminating-null.c
# DEP tests/incbin.c
# DEP tests/boot-cpuid.c
# DEP tests/phandle_format.c
# DEP tests/path-references.c
# DEP tests/references.c
# DEP tests/string_escapes.c
# DEP tests/propname_escapes.c
# DEP tests/appendprop2.c
# DEP tests/appendprop1.c
# DEP tests/del_node.c
# DEP tests/del_property.c
# DEP tests/setprop.c
# DEP tests/set_name.c
# DEP tests/rw_tree1.c
# DEP tests/open_pack.c
# DEP tests/nopulate.c
# DEP tests/mangle-layout.c
# DEP tests/move_and_save.c
# DEP tests/sw_tree1.c
# DEP tests/nop_node.c
# DEP tests/nop_property.c
# DEP tests/setprop_inplace.c
# DEP tests/addr_size_cells.c
# DEP tests/notfound.c
# DEP tests/sized_cells.c
# DEP tests/char_literal.c
# DEP tests/get_alias.c
# DEP tests/node_offset_by_compatible.c
# DEP tests/node_check_compatible.c
# DEP tests/node_offset_by_phandle.c
# DEP tests/node_offset_by_prop_value.c
# DEP tests/parent_offset.c
# DEP tests/supernode_atdepth_offset.c
# DEP tests/get_path.c
# DEP tests/get_phandle.c
# DEP tests/getprop.c
# DEP tests/get_name.c
# DEP tests/path_offset.c
# DEP tests/subnode_offset.c
# DEP tests/find_property.c
# DEP tests/root_node.c
# DEP tests/get_mem_rsv.c
# DEP libfdt/fdt_addresses.c
# DEP libfdt/fdt_empty_tree.c
# DEP libfdt/fdt_strerror.c
# DEP libfdt/fdt_rw.c
# DEP libfdt/fdt_sw.c
# DEP libfdt/fdt_wip.c
# DEP libfdt/fdt_ro.c
# DEP libfdt/fdt.c
# DEP util.c
# DEP fdtput.c
# DEP fdtget.c
# DEP fdtdump.c
# LEX convert-dtsv0-lexer.lex.c
# make: *** Deleting file 'convert-dtsv0-lexer.lex.c'
# DEP srcpos.c
# BISON dtc-parser.tab.c
# LEX dtc-lexer.lex.c
# DEP treesource.c
# DEP livetree.c
# DEP fstree.c
# DEP flattree.c
# DEP dtc.c
# DEP data.c
# DEP checks.c
# CHK version_gen.h
# UPD version_gen.h
# DEP util.c
# LEX convert-dtsv0-lexer.lex.c
# BISON dtc-parser.tab.c
# DEP dtc-lexer.lex.c
# CHK version_gen.h
# DEP convert-dtsv0-lexer.lex.c
# BISON dtc-parser.tab.c
# CHK version_gen.h
# BISON dtc-parser.tab.c
# CC srcpos.o
# CC util.o
# CC convert-dtsv0-lexer.lex.o
# LD convert-dtsv0
# /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/6.1.1/../../../../lib64/crt1.o: In function `_start':
# (.text+0x20): undefined reference to `main'
# clang-3.8: error: linker command failed with exit code 1 (use -v to see invocation)
# make: *** [Makefile:191: convert-dtsv0] Error 1
# ==> ERROR: A failure occurred in build().
# Aborting...