scripts/Makefile.gcc-plugins

   1 # SPDX-License-Identifier: GPL-2.0
   2 ifdef CONFIG_GCC_PLUGINS
   3   __PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC))
   4   PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")
   5
   6   SANCOV_PLUGIN := -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so
   7
   8   gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY)        += cyc_complexity_plugin.so
   9
  10   gcc-plugin-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY)        += latent_entropy_plugin.so
  11   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_LATENT_ENTROPY) += -DLATENT_ENTROPY_PLUGIN
  12   ifdef CONFIG_GCC_PLUGIN_LATENT_ENTROPY
  13     DISABLE_LATENT_ENTROPY_PLUGIN                       += -fplugin-arg-latent_entropy_plugin-disable
  14   endif
  15
  16   ifdef CONFIG_GCC_PLUGIN_SANCOV
  17     ifeq ($(strip $(CFLAGS_KCOV)),)
  18       # It is needed because of the gcc-plugin.sh and gcc version checks.
  19       gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV)           += sancov_plugin.so
  20
  21       ifneq ($(PLUGINCC),)
  22         CFLAGS_KCOV := $(SANCOV_PLUGIN)
  23       else
  24         $(warning warning: cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is not supported by compiler)
  25       endif
  26     endif
  27   endif
  28
  29   gcc-plugin-$(CONFIG_GCC_PLUGIN_STRUCTLEAK)    += structleak_plugin.so
  30   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE)     += -fplugin-arg-structleak_plugin-verbose
  31   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL)   += -fplugin-arg-structleak_plugin-byref-all
  32   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK)     += -DSTRUCTLEAK_PLUGIN
  33
  34   gcc-plugin-$(CONFIG_GCC_PLUGIN_RANDSTRUCT)    += randomize_layout_plugin.so
  35   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT)     += -DRANDSTRUCT_PLUGIN
  36   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE) += -fplugin-arg-randomize_layout_plugin-performance-mode
  37
  38   GCC_PLUGINS_CFLAGS := $(strip $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y)) $(gcc-plugin-cflags-y))
  39
  40   export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN GCC_PLUGIN_SUBDIR
  41   export SANCOV_PLUGIN DISABLE_LATENT_ENTROPY_PLUGIN
  42
  43   ifneq ($(PLUGINCC),)
  44     # SANCOV_PLUGIN can be only in CFLAGS_KCOV because avoid duplication.
  45     GCC_PLUGINS_CFLAGS := $(filter-out $(SANCOV_PLUGIN), $(GCC_PLUGINS_CFLAGS))
  46   endif
  47
  48   KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
  49   GCC_PLUGIN := $(gcc-plugin-y)
  50   GCC_PLUGIN_SUBDIR := $(gcc-plugin-subdir-y)
  51 endif
  52
  53 # If plugins aren't supported, abort the build before hard-to-read compiler
  54 # errors start getting spewed by the main build.
  55 PHONY += gcc-plugins-check
  56 gcc-plugins-check: FORCE
  57 ifdef CONFIG_GCC_PLUGINS
  58   ifeq ($(PLUGINCC),)
  59     ifneq ($(GCC_PLUGINS_CFLAGS),)
  60       # Various gccs between 4.5 and 5.1 have bugs on powerpc due to missing
  61       # header files. gcc <= 4.6 doesn't work at all, gccs from 4.8 to 5.1 have
  62       # issues with 64-bit targets.
  63       ifeq ($(ARCH),powerpc)
  64         ifeq ($(call cc-ifversion, -le, 0501, y), y)
  65           @echo "Cannot use CONFIG_GCC_PLUGINS: plugin support on gcc <= 5.1 is buggy on powerpc, please upgrade to gcc 5.2 or newer" >&2 && exit 1
  66         endif
  67       endif
  68       ifeq ($(call cc-ifversion, -ge, 0405, y), y)
  69         $(Q)$(srctree)/scripts/gcc-plugin.sh --show-error "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)" || true
  70         @echo "Cannot use CONFIG_GCC_PLUGINS: your gcc installation does not support plugins, perhaps the necessary headers are missing?" >&2 && exit 1
  71       else
  72         @echo "Cannot use CONFIG_GCC_PLUGINS: your gcc version does not support plugins, you should upgrade it to at least gcc 4.5" >&2 && exit 1
  73       endif
  74     endif
  75   endif
  76 endif
  77         @:
  78
  79 # Actually do the build, if requested.
  80 PHONY += gcc-plugins
  81 gcc-plugins: scripts_basic gcc-plugins-check
  82 ifdef CONFIG_GCC_PLUGINS
  83         $(Q)$(MAKE) $(build)=scripts/gcc-plugins
  84 endif
  85         @: