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Diffstat (limited to 'Config.mk')
| -rw-r--r-- | Config.mk | 21 |
1 files changed, 21 insertions, 0 deletions
@@ -4,6 +4,12 @@ ifeq ($(filter /%,$(XEN_ROOT)),) $(error XEN_ROOT must be absolute) endif +# Convenient variables +comma := , +squote := ' +empty := +space := $(empty) $(empty) + # fallback for older make realpath = $(wildcard $(foreach file,$(1),$(shell cd -P $(dir $(file)) && echo "$$PWD/$(notdir $(file))"))) @@ -128,6 +134,21 @@ endef check-$(gcc) = $(call cc-ver-check,CC,0x040100,"Xen requires at least gcc-4.1") $(eval $(check-y)) +# as-insn: Check whether assembler supports an instruction. +# Usage: cflags-y += $(call as-insn "insn",option-yes,option-no) +as-insn = $(if $(shell echo 'void _(void) { asm volatile ( $(2) ); }' \ + | $(1) -c -x c -o /dev/null - 2>&1),$(4),$(3)) + +# as-insn-check: Add an option to compilation flags, but only if insn is +# supported by assembler. +# Usage: $(call as-insn-check CFLAGS,CC,"nop",-DHAVE_GAS_NOP) +as-insn-check = $(eval $(call as-insn-check-closure,$(1),$(2),$(3),$(4))) +define as-insn-check-closure + ifeq ($$(call as-insn,$$($(2)),$(3),y,n),y) + $(1) += $(4) + endif +endef + define buildmakevars2shellvars export PREFIX="$(PREFIX)"; \ export XEN_SCRIPT_DIR="$(XEN_SCRIPT_DIR)"; \ |