diff options
Diffstat (limited to 'tools/build/Build.include')
| -rw-r--r-- | tools/build/Build.include | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tools/build/Build.include b/tools/build/Build.include index 585486e40995..2cf3b1bde86e 100644 --- a/tools/build/Build.include +++ b/tools/build/Build.include @@ -100,3 +100,27 @@ cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXX ## HOSTCC C flags host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(KBUILD_HOSTCFLAGS) -D"BUILD_STR(s)=\#s" $(HOSTCFLAGS_$(basetarget).o) $(HOSTCFLAGS_$(obj)) + +# output directory for tests below +TMPOUT = .tmp_$$$$ + +# try-run +# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise) +# Exit code chooses option. "$$TMP" serves as a temporary file and is +# automatically cleaned up. +try-run = $(shell set -e; \ + TMP=$(TMPOUT)/tmp; \ + mkdir -p $(TMPOUT); \ + trap "rm -rf $(TMPOUT)" EXIT; \ + if ($(1)) >/dev/null 2>&1; \ + then echo "$(2)"; \ + else echo "$(3)"; \ + fi) + +# cc-option +# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) +cc-option = $(call try-run, \ + $(CC) -Werror $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) + +# delete partially updated (i.e. corrupted) files on error +.DELETE_ON_ERROR: |