On 27 March 2014 07:54, jfrm.maurel@xxxxxxxxx wrote: > > Hi, > > Trying to build boost libraries I have following failure when issuing > following command under cygwin 64 on Windows 7 (64bits 6Go RAM): > > "g++" -x assembler-with-cpp -O3 -finline-functions -Wno-inline -Wall > -DBOOST_ALL_NO_LIB=1 -DBOOST_CONTEXT_SOURCE -DNDEBUG -I"." -c -o > "bin.v2/libs/context/build/gcc-4.8.2/release/link-static/asm/make_x86_64_sysv_elf_gas.o" > "libs/context/src/asm/make_x86_64_sysv_elf_gas.S" The assembler is not part of G++, it comes from the binutils project, so the errors you are getting are not from G++. I don't know what the assembler errors mean, but the first thing I would try is updating your binutils from Cygwin.