Build of fftw 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: fftw 3.3.4-2 (Wed Apr 5 00:52:52 UTC 2017)
# ==> Checking runtime dependencies...
# ==> Checking buildtime dependencies...
# ==> WARNING: Using existing $srcdir/ tree
# ==> Starting build()...
# checking for a BSD-compatible install... /usr/bin/install -c
# checking whether build environment is sane... yes
# checking for x86_64-unknown-linux-strip... no
# checking for strip... strip
# checking for a thread-safe mkdir -p... /usr/sbin/mkdir -p
# checking for gawk... gawk
# checking whether make sets $(MAKE)... yes
# checking whether make supports nested variables... yes
# checking whether to enable maintainer-specific portions of Makefiles... no
# checking build system type... x86_64-unknown-linux-gnu
# checking host system type... x86_64-unknown-linux-gnu
# checking for x86_64-unknown-linux-gcc... clang
# checking whether the C compiler works... no
# configure: error: in `/tmp/fftw/src/fftw-3.3.4-double':
# configure: error: C compiler cannot create executables
# See `config.log' for more details
# ==> 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 fftw configure 3.3.4, which was
# generated by GNU Autoconf 2.69. Invocation command line was
#
# $ ./configure --host=x86_64-unknown-linux F77=gfortran --prefix=/usr --enable-shared --enable-threads --enable-openmp --enable-sse2 --enable-avx
#
# ## --------- ##
# ## Platform. ##
# ## --------- ##
#
# hostname = 3f7bb6b973cf
# 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:2750: checking for a BSD-compatible install
# configure:2818: result: /usr/bin/install -c
# configure:2829: checking whether build environment is sane
# configure:2884: result: yes
# configure:2943: checking for x86_64-unknown-linux-strip
# configure:2973: result: no
# configure:2983: checking for strip
# configure:2999: found /sysroot/bin/strip
# configure:3010: result: strip
# configure:3035: checking for a thread-safe mkdir -p
# configure:3074: result: /usr/sbin/mkdir -p
# configure:3081: checking for gawk
# configure:3097: found /usr/sbin/gawk
# configure:3108: result: gawk
# configure:3119: checking whether make sets $(MAKE)
# configure:3141: result: yes
# configure:3170: checking whether make supports nested variables
# configure:3187: result: yes
# configure:3316: checking whether to enable maintainer-specific portions of Makefiles
# configure:3325: result: no
# configure:3373: checking build system type
# configure:3387: result: x86_64-unknown-linux-gnu
# configure:3407: checking host system type
# configure:3420: result: x86_64-unknown-linux-gnu
# configure:3818: checking for x86_64-unknown-linux-gcc
# configure:3845: result: clang
# configure:4114: checking for C compiler version
# configure:4123: clang --version >&5
# clang version 3.8.1
# Target: x86_64-unknown-linux-gnu
# Thread model: posix
# InstalledDir: /
# configure:4134: $? = 0
# configure:4123: 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:4134: $? = 0
# configure:4123: clang -V >&5
# clang-3.8: error: argument to '-V' is missing (expected 1 value)
# clang-3.8: error: no input files
# configure:4134: $? = 1
# configure:4123: clang -qversion >&5
# clang-3.8: error: unknown argument: '-qversion'
# clang-3.8: error: no input files
# configure:4134: $? = 1
# configure:4154: checking whether the C compiler works
# configure:4176: clang -O3 -fomit-frame-pointer -malign-double -fstrict-aliasing -ffast-math conftest.c >&5
# clang-3.8: error: unknown argument: '-malign-double'
# configure:4180: $? = 1
# configure:4218: result: no
# configure: failed program was:
# | /* confdefs.h */
# | #define PACKAGE_NAME "fftw"
# | #define PACKAGE_TARNAME "fftw"
# | #define PACKAGE_VERSION "3.3.4"
# | #define PACKAGE_STRING "fftw 3.3.4"
# | #define PACKAGE_BUGREPORT "fftw@fftw.org"
# | #define PACKAGE_URL ""
# | #define PACKAGE "fftw"
# | #define VERSION "3.3.4"
# | #define FFTW_ENABLE_ALLOCA 1
# | #define HAVE_SSE2 1
# | #define HAVE_AVX 1
# | /* end confdefs.h. */
# |
# | int
# | main ()
# | {
# |
# | ;
# | return 0;
# | }
# configure:4223: error: in `/tmp/fftw/src/fftw-3.3.4-double':
# configure:4225: error: C compiler cannot create executables
# See `config.log' for more details
#
# ## ---------------- ##
# ## Cache variables. ##
# ## ---------------- ##
#
# ac_cv_build=x86_64-unknown-linux-gnu
# ac_cv_env_CC_set=set
# ac_cv_env_CC_value=clang
# ac_cv_env_CFLAGS_set=set
# ac_cv_env_CFLAGS_value=' -O3 -fomit-frame-pointer -malign-double -fstrict-aliasing -ffast-math'
# ac_cv_env_CPPFLAGS_set=set
# ac_cv_env_CPPFLAGS_value=
# ac_cv_env_CPP_set=
# ac_cv_env_CPP_value=
# ac_cv_env_F77_set=set
# ac_cv_env_F77_value=gfortran
# ac_cv_env_FFLAGS_set=
# ac_cv_env_FFLAGS_value=
# ac_cv_env_LDFLAGS_set=set
# ac_cv_env_LDFLAGS_value=
# ac_cv_env_LIBS_set=
# ac_cv_env_LIBS_value=
# ac_cv_env_MPICC_set=
# ac_cv_env_MPICC_value=
# ac_cv_env_build_alias_set=
# ac_cv_env_build_alias_value=
# ac_cv_env_host_alias_set=set
# ac_cv_env_host_alias_value=x86_64-unknown-linux
# ac_cv_env_target_alias_set=
# ac_cv_env_target_alias_value=
# ac_cv_host=x86_64-unknown-linux-gnu
# ac_cv_path_install='/usr/bin/install -c'
# ac_cv_path_mkdir=/usr/sbin/mkdir
# ac_cv_prog_AWK=gawk
# ac_cv_prog_CC=clang
# ac_cv_prog_ac_ct_STRIP=strip
# ac_cv_prog_make_make_set=yes
# am_cv_make_support_nested_variables=yes
#
# ## ----------------- ##
# ## Output variables. ##
# ## ----------------- ##
#
# ACLOCAL='${SHELL} /tmp/fftw/src/fftw-3.3.4-double/missing aclocal-1.14'
# ALLOCA=''
# ALTIVEC_CFLAGS=''
# AMDEPBACKSLASH=''
# AMDEP_FALSE=''
# AMDEP_TRUE=''
# AMTAR='$${TAR-tar}'
# AM_BACKSLASH='\'
# AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
# AM_DEFAULT_VERBOSITY='1'
# AM_V='$(V)'
# AR=''
# AS=''
# AUTOCONF='${SHELL} /tmp/fftw/src/fftw-3.3.4-double/missing autoconf'
# AUTOHEADER='${SHELL} /tmp/fftw/src/fftw-3.3.4-double/missing autoheader'
# AUTOMAKE='${SHELL} /tmp/fftw/src/fftw-3.3.4-double/missing automake-1.14'
# AVX_CFLAGS=''
# AWK='gawk'
# CC='clang'
# CCDEPMODE=''
# CFLAGS=' -O3 -fomit-frame-pointer -malign-double -fstrict-aliasing -ffast-math'
# CHECK_PL_OPTS=''
# COMBINED_THREADS_FALSE=''
# COMBINED_THREADS_TRUE=''
# CPP=''
# CPPFLAGS=''
# CYGPATH_W='echo'
# C_FFTW_R2R_KIND=''
# C_MPI_FINT=''
# DEFS=''
# DEPDIR=''
# DLLTOOL=''
# DSYMUTIL=''
# DUMPBIN=''
# ECHO_C=''
# ECHO_N='-n'
# ECHO_T=''
# EGREP=''
# EXEEXT=''
# F77='gfortran'
# FFLAGS=''
# FGREP=''
# FLIBS=''
# GREP=''
# HAVE_ALTIVEC_FALSE=''
# HAVE_ALTIVEC_TRUE='#'
# HAVE_AVX_FALSE='#'
# HAVE_AVX_TRUE=''
# HAVE_NEON_FALSE=''
# HAVE_NEON_TRUE='#'
# HAVE_SSE2_FALSE='#'
# HAVE_SSE2_TRUE=''
# INSTALL_DATA='${INSTALL} -m 644'
# INSTALL_PROGRAM='${INSTALL}'
# INSTALL_SCRIPT='${INSTALL}'
# INSTALL_STRIP_PROGRAM='$(install_sh) -c -s'
# LD=''
# LDFLAGS=''
# LDOUBLE_FALSE=''
# LDOUBLE_TRUE='#'
# LIBOBJS=''
# LIBQUADMATH=''
# LIBS=''
# LIBTOOL=''
# LIPO=''
# LN_S=''
# LTLIBOBJS=''
# MAINT='#'
# MAINTAINER_MODE_FALSE=''
# MAINTAINER_MODE_TRUE='#'
# MAKEINFO='${SHELL} /tmp/fftw/src/fftw-3.3.4-double/missing makeinfo'
# MANIFEST_TOOL=''
# MKDIR_P='/usr/sbin/mkdir -p'
# MPICC=''
# MPILIBS=''
# MPIRUN=''
# MPI_FALSE=''
# MPI_TRUE=''
# NEON_CFLAGS=''
# NM=''
# NMEDIT=''
# OBJDUMP=''
# OBJEXT=''
# OCAMLBUILD=''
# OPENMP_CFLAGS=''
# OPENMP_FALSE=''
# OPENMP_TRUE=''
# OTOOL64=''
# OTOOL=''
# PACKAGE='fftw'
# PACKAGE_BUGREPORT='fftw@fftw.org'
# PACKAGE_NAME='fftw'
# PACKAGE_STRING='fftw 3.3.4'
# PACKAGE_TARNAME='fftw'
# PACKAGE_URL=''
# PACKAGE_VERSION='3.3.4'
# PATH_SEPARATOR=':'
# POW_LIB=''
# PRECISION='d'
# PREC_SUFFIX=''
# PTHREAD_CC=''
# PTHREAD_CFLAGS=''
# PTHREAD_LIBS=''
# QUAD_FALSE=''
# QUAD_TRUE='#'
# RANLIB=''
# SED=''
# SET_MAKE=''
# SHARED_VERSION_INFO='7:4:4'
# SHELL='/bin/sh'
# SINGLE_FALSE=''
# SINGLE_TRUE='#'
# SMP_FALSE=''
# SMP_TRUE=''
# SSE2_CFLAGS=''
# STACK_ALIGN_CFLAGS=''
# STRIP='strip'
# THREADLIBS=''
# THREADS_FALSE=''
# THREADS_TRUE=''
# VERSION='3.3.4'
# ac_ct_AR=''
# ac_ct_CC=''
# ac_ct_DUMPBIN=''
# ac_ct_F77=''
# acx_pthread_config=''
# am__EXEEXT_FALSE=''
# am__EXEEXT_TRUE=''
# am__fastdepCC_FALSE=''
# am__fastdepCC_TRUE=''
# am__include=''
# am__isrc=''
# am__leading_dot='.'
# am__nodep=''
# am__quote=''
# am__tar='$${TAR-tar} chof - "$$tardir"'
# am__untar='$${TAR-tar} xf -'
# bindir='${exec_prefix}/bin'
# build='x86_64-unknown-linux-gnu'
# build_alias=''
# build_cpu='x86_64'
# build_os='linux-gnu'
# build_vendor='unknown'
# datadir='${datarootdir}'
# datarootdir='${prefix}/share'
# docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
# dvidir='${docdir}'
# exec_prefix='NONE'
# host='x86_64-unknown-linux-gnu'
# host_alias='x86_64-unknown-linux'
# host_cpu='x86_64'
# host_os='linux-gnu'
# host_vendor='unknown'
# htmldir='${docdir}'
# includedir='${prefix}/include'
# infodir='${datarootdir}/info'
# install_sh='${SHELL} /tmp/fftw/src/fftw-3.3.4-double/install-sh'
# libdir='${exec_prefix}/lib'
# libexecdir='${exec_prefix}/libexec'
# localedir='${datarootdir}/locale'
# localstatedir='${prefix}/var'
# mandir='${datarootdir}/man'
# mkdir_p='$(MKDIR_P)'
# oldincludedir='/usr/include'
# pdfdir='${docdir}'
# prefix='/usr'
# program_transform_name='s,x,x,'
# psdir='${docdir}'
# sbindir='${exec_prefix}/sbin'
# sharedstatedir='${prefix}/com'
# sysconfdir='${prefix}/etc'
# target_alias=''
#
# ## ----------- ##
# ## confdefs.h. ##
# ## ----------- ##
#
# /* confdefs.h */
# #define PACKAGE_NAME "fftw"
# #define PACKAGE_TARNAME "fftw"
# #define PACKAGE_VERSION "3.3.4"
# #define PACKAGE_STRING "fftw 3.3.4"
# #define PACKAGE_BUGREPORT "fftw@fftw.org"
# #define PACKAGE_URL ""
# #define PACKAGE "fftw"
# #define VERSION "3.3.4"
# #define FFTW_ENABLE_ALLOCA 1
# #define HAVE_SSE2 1
# #define HAVE_AVX 1
#
# configure: exit 77