diff options
| -rw-r--r-- | profiles/arch/x86_64/make.defaults | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/profiles/arch/x86_64/make.defaults b/profiles/arch/x86_64/make.defaults index 7315763c5..8745460a4 100644 --- a/profiles/arch/x86_64/make.defaults +++ b/profiles/arch/x86_64/make.defaults @@ -1 +1,30 @@ -ARCH=x86_64 +# We definitely use 64-bit ABI. +ABI_X86="64" +IUSE_IMPLICIT="abi_x86_64" + +ARCH="x86_64" +ACCEPT_KEYWORDS="${ARCH} amd64" # HACK for using Gentoo ebuilds + +# -O2 -> Perform second-level optimisations. +# Not -Os because most/all x86_64 aren't starved for space. +# -ggdb -> Generate GDB debugging information. +# This is used with splitdebug to make -dbg split packages. +# -march=nocona -> Require a "Nocona" Pentium 4 or newer. +# At some point, pending user demand, this may change to core2. +# !!!NOTE!!! If that happens, Nocona P4 will no longer work! +# -mtune=core2 -> Tune for Core 2 processors. +# Most tuning for Core 2 is applicable to * Bridge and *well, +# and makes code more performant on the much larger base of +# those machines. +# -fno-omit-... -> Never omit the frame pointer. +# This is crucial for proper debugging. +# -mfpmath=sse -> Use SSE for all floating point math. +# Since SSE is always available, this knob ensures that GCC +# will take advantage of it over preferring 387 math, which +# can drag down performance on modern x86_64. +CFLAGS="-O2 -ggdb -march=nocona -mtune=core2 -fno-omit-frame-pointer -mfpmath=sse" +CXXFLAGS="${CFLAGS}" + +ELIBC="musl" + +USE="pam threads" |