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@@ -223,6 +223,27 @@ HOST_CFLAGS += $(HOST_CPPFLAGS)
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HOST_CXXFLAGS += $(HOST_CFLAGS)
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HOST_LDFLAGS += -L$(HOST_DIR)/lib -L$(HOST_DIR)/usr/lib -Wl,-rpath,$(HOST_DIR)/usr/lib
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+# The macros below are taken from linux 4.11 and adapted slightly.
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+# Copy more when needed.
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+
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+# try-run
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+# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
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+# Exit code chooses option. "$$TMP" is can be used as temporary file and
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+# is automatically cleaned up.
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+try-run = $(shell set -e; \
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+ TMP="$$(tempfile)"; \
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+ if ($(1)) >/dev/null 2>&1; \
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+ then echo "$(2)"; \
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+ else echo "$(3)"; \
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+ fi; \
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+ rm -f "$$TMP")
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+
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+# host-cc-option
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+# Usage: HOST_FOO_CFLAGS += $(call host-cc-option,-no-pie,)
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+host-cc-option = $(call try-run,\
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+ $(HOSTCC) $(HOST_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
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+
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+
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# host-intltool should be executed with the system perl, so we save
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# the path to the system perl, before a host-perl built by Buildroot
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# might get installed into $(HOST_DIR)/usr/bin and therefore appears
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