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-rw-r--r--profiles/arch/x86_64/make.defaults31
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"