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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>
Denys Vlasenko 3 years ago
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fad8d6b6c0
1 changed files with 11 additions and 0 deletions
  1. 11 0
      arch/x86_64/Makefile

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arch/x86_64/Makefile

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+# ==========================================================================
+# 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,)