From d26e94149276f8c3d4911aa2c8395ba99b613c8d Mon Sep 17 00:00:00 2001 From: Emese Revfy Date: Fri, 17 Jun 2016 23:28:34 -0700 Subject: [PATCH] kbuild: no gcc-plugins during cc-option tests The gcc-plugins arguments should not be included when performing cc-option tests. Steps to reproduce: 1) make mrproper 2) make defconfig 3) enable GCC_PLUGINS, GCC_PLUGIN_CYC_COMPLEXITY 4) enable FUNCTION_TRACER (it will select other options as well) 5) make && make modules Build errors: MODPOST 18 modules ERROR: "__fentry__" [net/netfilter/xt_nat.ko] undefined! ERROR: "__fentry__" [net/netfilter/xt_mark.ko] undefined! ERROR: "__fentry__" [net/netfilter/xt_addrtype.ko] undefined! ERROR: "__fentry__" [net/netfilter/xt_LOG.ko] undefined! ERROR: "__fentry__" [net/netfilter/nf_nat_sip.ko] undefined! ERROR: "__fentry__" [net/netfilter/nf_nat_irc.ko] undefined! ERROR: "__fentry__" [net/netfilter/nf_nat_ftp.ko] undefined! ERROR: "__fentry__" [net/netfilter/nf_nat.ko] undefined! Reported-by: Laura Abbott Signed-off-by: Emese Revfy [kees: renamed variable, clarified commit message] Signed-off-by: Kees Cook --- scripts/Kbuild.include | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include index 15b196fc2f49b..179219845dfcd 100644 --- a/scripts/Kbuild.include +++ b/scripts/Kbuild.include @@ -108,16 +108,20 @@ as-option = $(call try-run,\ as-instr = $(call try-run,\ printf "%b\n" "$(1)" | $(CC) $(KBUILD_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) +# Do not attempt to build with gcc plugins during cc-option tests. +# (And this uses delayed resolution so the flags will be up to date.) +CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) + # cc-option # Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586) cc-option = $(call try-run,\ - $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) + $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) # cc-option-yn # Usage: flag := $(call cc-option-yn,-march=winchip-c6) cc-option-yn = $(call try-run,\ - $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) + $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n) # cc-option-align # Prefix align with either -falign or -malign @@ -127,7 +131,7 @@ cc-option-align = $(subst -functions=0,,\ # cc-disable-warning # Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable) cc-disable-warning = $(call try-run,\ - $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) + $(CC) $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) # cc-name # Expands to either gcc or clang -- 2.39.5