Using built-in specs.
COLLECT_GCC=gm2
COLLECT_LTO_WRAPPER=/gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: 
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.1 20201231 (GCC) 
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
 /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/gm2l -v -I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim -o /tmp/ccHfdqPz.l hello.mod
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
 /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/gm2lorder /tmp/ccHfdqPz.l -o /tmp/ccZ3mP5z.lst
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
 /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/gm2lgen -fcpp /tmp/ccZ3mP5z.lst -o hello_m2.cpp
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
 /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/cc1plus -v -mtune=generic -march=x86-64 -g -I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim -quiet hello_m2.cpp -o hello_m2.s
ignoring nonexistent directory "/no-gcc-local-prefix/include"
ignoring nonexistent directory "/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim
 /gnu/store/lcf84ypxacw7614n5d141nxaxqnd7sil-profile/include
 /gnu/store/c3pbsr5gyp8f9bvn45p5p6n0dgbil4dp-profile/include
 /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/include/c++
 /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/include/c++/x86_64-unknown-linux-gnu
 /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/include/c++/backward
 /gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/include
 /gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/include-fixed
 /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/include
End of search list.
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
 as --64 hello_m2.s -o /tmp/cc2pSVfystart.o
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
 rm -f /tmp/ccjsXt8A.a
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
 /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/gm2lcc -L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim -L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim -ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar -ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib -fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim -v --exec --startup /tmp/cc2pSVfystart.o --ar -o /tmp/ccjsXt8A.a --mainobject hello.o /tmp/ccZ3mP5z.lst
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
 rm -f /tmp/cc2pSVfystart
COMPILER_PATH=/gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/:/gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/:/gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/:/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/:/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/
LIBRARY_PATH=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/:/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../../:/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib
COLLECT_GCC_OPTIONS='-I/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-ftarget-ar=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ar' '-ftarget-ranlib=/gnu/store/m1z7cdbqsqyp9xnjw5cvlb4a7gkcg3m4-binutils-2.34/bin/ranlib' '-fobject-path=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-x' 'modula-2' '-fplugin=m2rte' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim' '-shared-libgcc' '-v' '-g' '-fonlylink' '-mtune=generic' '-march=x86-64'
 /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/collect2 -plugin /gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/liblto_plugin.so -plugin-opt=/gnu/store/3v0c18p7zzfbi6hzzgaqp73v3g1kafi2-gm2-gm2-10/libexec/gcc/x86_64-unknown-linux-gnu/10.2.1/lto-wrapper -plugin-opt=-fresolution=/tmp/ccZUGO7x.res -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --eh-frame-hdr -m elf_x86_64 -dynamic-linker /gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib/ld-linux-x86-64.so.2 crt1.o crti.o /gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/crtbegin.o -L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim -L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/m2/m2pim -L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1 -L/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/../../.. -L/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib /tmp/ccjsXt8A.a -lm2pim -lpthread -lstdc++ -lgcc_eh -lgcc_s -lgcc -L/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib -rpath=/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib -rpath=/gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib -lgcc_s -lc -lgcc_s -lgcc /gnu/store/50v4qv942jvfpn5xsqrbb97grym140jl-gm2-gm2-10-lib/lib/gcc/x86_64-unknown-linux-gnu/10.2.1/crtend.o crtn.o
/usr/bin/ld: cannot find crt1.o: No such file or directory
/usr/bin/ld: cannot find crti.o: No such file or directory
collect2: error: ld returned 1 exit status