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authorDenys Vlasenko2020-12-15 18:39:05 +0100
committerDenys Vlasenko2020-12-15 18:39:05 +0100
commitfad8d6b6c0290e92b89cd18493c0c336f3619ee1 (patch)
treee6f6a6af668e966399c899e3416923f3e5e3fff5
parent2aaacc1453e98bd24341e7dc6edd8e7fdf84e576 (diff)
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build system: combat gcc zealotry in data alignment, now for x86_64 too
function old new delta .rodata 182928 182620 -308 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--arch/x86_64/Makefile11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile
new file mode 100644
index 0000000..16576fb
--- /dev/null
+++ b/arch/x86_64/Makefile
@@ -0,0 +1,11 @@
+# ==========================================================================
+# Build system
+# ==========================================================================
+
+# "Control how GCC aligns variables.
+# Supported values for type are compat uses increased alignment value
+# compatible uses GCC 4.8 and earlier, abi uses alignment value as specified by the psABI,
+# and cacheline uses increased alignment value to match the cache line size.
+# compat is the default."
+# "abi" seems to be somewhat successful in preventing oversealous data alignment.
+CFLAGS += $(call cc-option,-malign-data=abi,)