It looks like boost-build's build system dislikes tab characters inside of the CFLAGS variable in /etc/make.conf. For readability, I have my CFLAGS formatted as this (\t == tab): CFLAGS="-O2 -march=core2 -mtune=core2 \ \t-mfpmath=sse -msse -msse2 -mssse3 -msse4.1 \ \t-mcx16 -msahf -maccumulate-outgoing-args \ \t-fforce-addr -fmodulo-sched -fivopts \ \t-fgcse-after-reload -fgcse-lm -fgcse-sm -fgcse-las \ \t-ftree-loop-im -ftree-loop-linear -ftree-loop-ivcanon \ \t-ftree-vectorize" However, because boost-build wraps each CFLAG in double quotes, it looks like it's retaining the tab characters. Note the whitespace before -mfpmath=sse and -mcx16 as examples: "x86_64-pc-linux-gnu-gcc" -o bin.linuxx86_64/b2 "-DNDEBUG" "-DOPT_HEADER_CACHE_EXT" "-DOPT_GRAPH_DEBUG_EXT" "-DOPT_SEMAPHORE" "-DOPT_AT_FILES" "-DOPT_DEBUG_PROFILE" "-DOPT_FIX_TARGET_VARIAB LES_EXT" "-DOPT_IMPROVED_PATIENCE_EXT" "-DYYSTACKSIZE=5000" "-O2" "-march=core2" "-mtune=core2" " -mfpmath=sse" "-msse" "-msse2" "-mssse3" "-msse4.1" " -mcx16" "-msahf" "-maccumulate-outg oing-args" " -fforce-addr" "-fmodulo-sched" "-fivopts" " -fgcse-after-reload" "-fgcse-lm" "-fgcse-sm" "-fgcse-las" " -ftree-loop-im" "-ftree-loop-linear" "-ftree-loop-ivcanon" " -ft ree-vectorize" "command.c" "compile.c" "constants.c" "debug.c" "function.c" "glob.c" "hash.c" "hcache.c" "headers.c" "hdrmacro.c" "jam.c" "jambase.c" "jamgram.c" "lists.c" "make.c" "make1.c" "mem .c" "object.c" "option.c" "output.c" "parse.c" "regexp.c" "rules.c" "scan.c" "search.c" "subst.c" "w32_getreg.c" "timestamp.c" "variable.c" "modules.c" "strings.c" "filesys.c" "builtins.c" "pwd.c " "class.c" "native.c" "md5.c" "modules/set.c" "modules/path.c" "modules/regex.c" "modules/property-set.c" "modules/sequence.c" "modules/order.c" "execunix.c" "fileunix.c" "pathunix.c" "-Wl,-z,no Which leads to this build failure: x86_64-pc-linux-gnu-gcc: error: -mfpmath=sse: No such file or directory x86_64-pc-linux-gnu-gcc: error: -mcx16: No such file or directory x86_64-pc-linux-gnu-gcc: error: -fforce-addr: No such file or directory x86_64-pc-linux-gnu-gcc: error: -fgcse-after-reload: No such file or directory x86_64-pc-linux-gnu-gcc: error: -ftree-loop-im: No such file or directory x86_64-pc-linux-gnu-gcc: error: -ftree-vectorize: No such file or directory ...skipped bjam for lack of b2... ...failed updating 1 target... * ERROR: dev-util/boost-build-1.53.0::gentoo failed (compile phase): * building bjam failed The quick fix is to either make CFLAGS a one-liner or remove the tabs.
Created attachment 364266 [details] emerge --info
Removed from tree, reopen if issue persists. commit abc5c3d3b5a854114070bf6ed2a9e6ad2f04d6e8 Author: David Seifert <soap@gentoo.org> Date: Tue Apr 4 19:33:14 2017 +0200 dev-util/boost-build: Remove old
