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buildsystem: add a macro to test options supported by the host compiler

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21304 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nico 2010-05-02 17:22:01 +00:00
parent 6b41b93bc5
commit cb2f53e0b7
1 changed files with 12 additions and 1 deletions
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13
include/host.mk
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@ -1,5 +1,5 @@
#
# Copyright (C) 2007 OpenWrt.org
# Copyright (C) 2007-2010 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
@ -14,6 +14,17 @@ export TAR FIND
ifneq ($(__host_inc),1)
__host_inc:=1
try-run = $(shell set -e; \
TMP_F="$(TMP_DIR)/try-run.$$$$.tmp"; \
if ($(1)) >/dev/null 2>&1; then echo "$(2)"; else echo "$(3)"; fi; \
rm -f "$$TMP_F"; \
)
host-cc-option = $(call try-run, \
$(HOSTCC) $(HOST_CFLAGS) $(1) -c -xc /dev/null -o "$$TMP_F",$(1),$(2) \
)
.PRECIOUS: $(TMP_DIR)/.host.mk
$(TMP_DIR)/.host.mk: $(TOPDIR)/include/host.mk
@mkdir -p $(TMP_DIR)