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buildsystem: add a macro to test options supported by the host compiler
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21304 3c298f89-4303-0410-b956-a3cf2f4a3e73
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@ -1,5 +1,5 @@
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#
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# Copyright (C) 2007 OpenWrt.org
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# Copyright (C) 2007-2010 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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@ -14,6 +14,17 @@ export TAR FIND
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ifneq ($(__host_inc),1)
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__host_inc:=1
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try-run = $(shell set -e; \
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TMP_F="$(TMP_DIR)/try-run.$$$$.tmp"; \
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if ($(1)) >/dev/null 2>&1; then echo "$(2)"; else echo "$(3)"; fi; \
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rm -f "$$TMP_F"; \
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)
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host-cc-option = $(call try-run, \
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$(HOSTCC) $(HOST_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP_F",$(1),$(2) \
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)
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.PRECIOUS: $(TMP_DIR)/.host.mk
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$(TMP_DIR)/.host.mk: $(TOPDIR)/include/host.mk
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@mkdir -p $(TMP_DIR)
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