Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/6.4.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-6.4.0-r1/work/gcc-6.4.0/configure --host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/6.4.0 --includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/include --datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/6.4.0 --mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/6.4.0/man --infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/6.4.0/info --with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/include/g++-v6 --with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/6.4.0/python --enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror --with-system-zlib --enable-nls --without-included-gettext --enable-checking=release --with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 6.4.0-r1 p1.3' --disable-esp --enable-libstdcxx-time --enable-shared --enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64 --disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj --enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts --disable-libmpx --enable-vtable-verify --enable-libvtv --disable-libquadmath --enable-lto --without-isl --enable-libsanitizer --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 6.4.0 (Gentoo 6.4.0-r1 p1.3) 
COLLECT_GCC_OPTIONS='-o' 'pthread_test' '-pthread' '-v' '-mtune=generic' '-march=x86-64'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/6.4.0/cc1 -quiet -v -D_REENTRANT pthread_test.c -quiet -dumpbase pthread_test.c -mtune=generic -march=x86-64 -auxbase pthread_test -version -o /tmp/ccKkD6o0.s
GNU C11 (Gentoo 6.4.0-r1 p1.3) version 6.4.0 (x86_64-pc-linux-gnu)
	compiled by GNU C version 6.4.0, GMP version 6.1.2, MPFR version 3.1.6, MPC version 1.0.3, isl version none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/include-fixed
 /usr/include
End of search list.
GNU C11 (Gentoo 6.4.0-r1 p1.3) version 6.4.0 (x86_64-pc-linux-gnu)
	compiled by GNU C version 6.4.0, GMP version 6.1.2, MPFR version 3.1.6, MPC version 1.0.3, isl version none
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 8fb4a29a4c5051228df74c09e4f28433
COLLECT_GCC_OPTIONS='-o' 'pthread_test' '-pthread' '-v' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../x86_64-pc-linux-gnu/bin/as -v --64 -o /tmp/ccEsR5lB.o /tmp/ccKkD6o0.s
GNU assembler version 2.29.1 (x86_64-pc-linux-gnu) using BFD version (Gentoo 2.29.1 p3) 2.29.1
COMPILER_PATH=/usr/libexec/gcc/x86_64-pc-linux-gnu/6.4.0/:/usr/libexec/gcc/x86_64-pc-linux-gnu/6.4.0/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../x86_64-pc-linux-gnu/bin/
LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/:/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../x86_64-pc-linux-gnu/lib/:/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-o' 'pthread_test' '-pthread' '-v' '-mtune=generic' '-march=x86-64'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/6.4.0/collect2 -plugin /usr/libexec/gcc/x86_64-pc-linux-gnu/6.4.0/liblto_plugin.so -plugin-opt=/usr/libexec/gcc/x86_64-pc-linux-gnu/6.4.0/lto-wrapper -plugin-opt=-fresolution=/tmp/cc6eClkc.res -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lpthread -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie -o pthread_test /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../lib64/Scrt1.o /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../lib64/crti.o /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/crtbeginS.o -L/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0 -L/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../x86_64-pc-linux-gnu/lib -L/usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../.. --as-needed /tmp/ccEsR5lB.o -lgcc --as-needed -lgcc_s --no-as-needed -lpthread -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/crtendS.o /usr/lib/gcc/x86_64-pc-linux-gnu/6.4.0/../../../../lib64/crtn.o
COLLECT_GCC_OPTIONS='-o' 'pthread_test' '-pthread' '-v' '-mtune=generic' '-march=x86-64'