Build of open-iscsi with musl toolchain

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

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

# /sysroot/lib
# /sysroot/share
# /sysroot/bin
# /sysroot/include
# /sysroot/libexec

# ==> Making package: open-iscsi 2.0_873-7 (Wed Apr 5 00:08:40 UTC 2017)
# ==> Checking runtime dependencies...
# ==> Checking buildtime dependencies...
# ==> WARNING: Using existing $srcdir/ tree
# ==> Starting build()...
# cd utils/open-isns; ./configure --without-slp CFLAGS="" --with-security=no
# checking for gcc... clang
# checking for C compiler default output file name... a.out
# checking whether the C compiler works... configure: error: in `/tmp/open-iscsi/src/open-iscsi-2.0-873/utils/open-isns':
# configure: error: cannot run C compiled programs.
# If you meant to cross compile, use `--host'.
# See `config.log' for more details.
# make: *** [Makefile:45: utils/open-isns/Makefile] Error 1
# ==> ERROR: A failure occurred in build().
# Aborting...

# This file contains any messages produced by compilers while
# running configure, to aid debugging if configure makes a mistake.
#
# It was created by open-isns configure 0.90, which was
# generated by GNU Autoconf 2.63. Invocation command line was
#
# $ ./configure --without-slp CFLAGS= --with-security=no
#
# ## --------- ##
# ## Platform. ##
# ## --------- ##
#
# hostname = eb2271f2feda
# uname -m = x86_64
# uname -r = 4.10.6-1-ARCH
# uname -s = Linux
# uname -v = #1 SMP PREEMPT Mon Mar 27 08:28:22 CEST 2017
#
# /usr/bin/uname -p = unknown
# /bin/uname -X = unknown
#
# /bin/arch = unknown
# /usr/bin/arch -k = unknown
# /usr/convex/getsysinfo = unknown
# /usr/bin/hostinfo = unknown
# /bin/machine = unknown
# /usr/bin/oslevel = unknown
# /bin/universe = unknown
#
# PATH: /sysroot/bin
# PATH: /usr/local/sbin
# PATH: /usr/local/bin
# PATH: /usr/sbin
# PATH: /usr/bin
# PATH: /sbin
# PATH: /bin
#
#
# ## ----------- ##
# ## Core tests. ##
# ## ----------- ##
#
# configure:1895: checking for gcc
# configure:1922: result: clang
# configure:2154: checking for C compiler version
# configure:2162: clang --version >&5
# clang version 3.8.1
# Target: x86_64-unknown-linux-gnu
# Thread model: posix
# InstalledDir: /
# configure:2166: $? = 0
# configure:2173: clang -v >&5
# clang version 3.8.1
# Target: x86_64-unknown-linux-gnu
# Thread model: posix
# InstalledDir: /
# Found candidate GCC installation: //../lib/gcc/x86_64-pc-linux-gnu/6.1.1
# Found candidate GCC installation: //../lib64/gcc/x86_64-pc-linux-gnu/6.1.1
# Selected GCC installation: //../lib64/gcc/x86_64-pc-linux-gnu/6.1.1
# Candidate multilib: .;@m64
# Selected multilib: .;@m64
# configure:2177: $? = 0
# configure:2184: clang -V >&5
# clang-3.8: error: argument to '-V' is missing (expected 1 value)
# clang-3.8: error: no input files
# configure:2188: $? = 1
# configure:2211: checking for C compiler default output file name
# configure:2233: clang conftest.c >&5
# configure:2237: $? = 0
# configure:2275: result: a.out
# configure:2294: checking whether the C compiler works
# configure:2304: ./a.out
# ./a.out: error while loading shared libraries: /usr/lib/libc.so: invalid ELF header
# configure:2308: $? = 127
# configure:2315: error: in `/tmp/open-iscsi/src/open-iscsi-2.0-873/utils/open-isns':
# configure:2319: error: cannot run C compiled programs.
# If you meant to cross compile, use `--host'.
# See `config.log' for more details.
#
# ## ---------------- ##
# ## Cache variables. ##
# ## ---------------- ##
#
# ac_cv_env_CC_set=set
# ac_cv_env_CC_value=clang
# ac_cv_env_CFLAGS_set=set
# ac_cv_env_CFLAGS_value=
# ac_cv_env_CPPFLAGS_set=set
# ac_cv_env_CPPFLAGS_value=
# ac_cv_env_CPP_set=
# ac_cv_env_CPP_value=
# ac_cv_env_LDFLAGS_set=set
# ac_cv_env_LDFLAGS_value=
# ac_cv_env_LIBS_set=
# ac_cv_env_LIBS_value=
# ac_cv_env_build_alias_set=
# ac_cv_env_build_alias_value=
# ac_cv_env_host_alias_set=
# ac_cv_env_host_alias_value=
# ac_cv_env_target_alias_set=
# ac_cv_env_target_alias_value=
# ac_cv_prog_ac_ct_CC=clang
#
# ## ----------------- ##
# ## Output variables. ##
# ## ----------------- ##
#
# CC='clang'
# CFLAGS=''
# CPP=''
# CPPFLAGS=''
# DEFS=''
# ECHO_C=''
# ECHO_N='-n'
# ECHO_T=''
# EGREP=''
# EXEEXT=''
# GETOPTSRC=''
# GREP=''
# INSTALL_DATA=''
# INSTALL_PROGRAM=''
# INSTALL_SCRIPT=''
# LDFLAGS=''
# LIBOBJS=''
# LIBS=''
# LN_S=''
# LTLIBOBJS=''
# OBJEXT=''
# OPTIMIZE=''
# PACKAGE_BUGREPORT=''
# PACKAGE_NAME='open-isns'
# PACKAGE_STRING='open-isns 0.90'
# PACKAGE_TARNAME='open-isns'
# PACKAGE_VERSION='0.90'
# PATH_SEPARATOR=':'
# SECLIBS=''
# SET_MAKE=''
# SH=''
# SHELL='/bin/sh'
# SLPLIBS=''
# ac_ct_CC='clang'
# bindir='${exec_prefix}/bin'
# build=''
# build_alias=''
# build_cpu=''
# build_os=''
# build_vendor=''
# datadir='${datarootdir}'
# datarootdir='${prefix}/share'
# docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
# dvidir='${docdir}'
# exec_prefix='NONE'
# host=''
# host_alias=''
# host_cpu=''
# host_os=''
# host_vendor=''
# htmldir='${docdir}'
# includedir='${prefix}/include'
# infodir='${datarootdir}/info'
# libdir='${exec_prefix}/lib'
# libexecdir='${exec_prefix}/libexec'
# localedir='${datarootdir}/locale'
# localstatedir='${prefix}/var'
# mandir='${datarootdir}/man'
# oldincludedir='/usr/include'
# pdfdir='${docdir}'
# prefix='NONE'
# program_transform_name='s,x,x,'
# psdir='${docdir}'
# sbindir='${exec_prefix}/sbin'
# sharedstatedir='${prefix}/com'
# sysconfdir='${prefix}/etc'
# target_alias=''
#
# ## ----------- ##
# ## confdefs.h. ##
# ## ----------- ##
#
# #define PACKAGE_NAME "open-isns"
# #define PACKAGE_TARNAME "open-isns"
# #define PACKAGE_VERSION "0.90"
# #define PACKAGE_STRING "open-isns 0.90"
# #define PACKAGE_BUGREPORT ""
#
# configure: exit 1