# SPDX-License-Identifier: GPL-2.0-only

  preferred-plugin-hostcc := $(if-success,[ $(gcc-version) -ge 40800 ],$(HOSTCXX),$(HOSTCC))
  
  config PLUGIN_HOSTCC
  	string

  	default "$(shell,$(srctree)/scripts/gcc-plugin.sh "$(preferred-plugin-hostcc)" "$(HOSTCXX)" "$(CC)")" if CC_IS_GCC

  	help
  	  Host compiler used to build GCC plugins.  This can be $(HOSTCXX),
  	  $(HOSTCC), or a null string if GCC plugin is unsupported.
  
  config HAVE_GCC_PLUGINS
  	bool
  	help
  	  An arch should select this symbol if it supports building with
  	  GCC plugins.

  config GCC_PLUGINS
  	bool

  	depends on HAVE_GCC_PLUGINS
  	depends on PLUGIN_HOSTCC != ""

  	default y

  	help
  	  GCC plugins are loadable modules that provide extra features to the
  	  compiler. They are useful for runtime instrumentation and static analysis.

  	  See Documentation/core-api/gcc-plugins.rst for details.

  menu "GCC plugins"
  	depends on GCC_PLUGINS

  
  config GCC_PLUGIN_CYC_COMPLEXITY
  	bool "Compute the cyclomatic complexity of a function" if EXPERT
  	depends on !COMPILE_TEST	# too noisy
  	help
  	  The complexity M of a function's control flow graph is defined as:
  	   M = E - N + 2P
  	  where
  
  	  E = the number of edges
  	  N = the number of nodes
  	  P = the number of connected components (exit nodes).
  
  	  Enabling this plugin reports the complexity to stderr during the
  	  build. It mainly serves as a simple example of how to create a
  	  gcc plugin for the kernel.
  
  config GCC_PLUGIN_SANCOV
  	bool
  	help
  	  This plugin inserts a __sanitizer_cov_trace_pc() call at the start of
  	  basic blocks. It supports all gcc versions with plugin support (from
  	  gcc-4.5 on). It is based on the commit "Add fuzzing coverage support"
  	  by Dmitry Vyukov <dvyukov@google.com>.
  
  config GCC_PLUGIN_LATENT_ENTROPY
  	bool "Generate some entropy during boot and runtime"
  	help
  	  By saying Y here the kernel will instrument some kernel code to
  	  extract some entropy from both original and artificially created
  	  program state.  This will help especially embedded systems where
  	  there is little 'natural' source of entropy normally.  The cost
  	  is some slowdown of the boot process (about 0.5%) and fork and
  	  irq processing.
  
  	  Note that entropy extracted this way is not cryptographically
  	  secure!
  
  	  This plugin was ported from grsecurity/PaX. More information at:
  	   * https://grsecurity.net/
  	   * https://pax.grsecurity.net/

  config GCC_PLUGIN_RANDSTRUCT
  	bool "Randomize layout of sensitive kernel structures"
  	select MODVERSIONS if MODULES
  	help
  	  If you say Y here, the layouts of structures that are entirely
  	  function pointers (and have not been manually annotated with
  	  __no_randomize_layout), or structures that have been explicitly
  	  marked with __randomize_layout, will be randomized at compile-time.
  	  This can introduce the requirement of an additional information
  	  exposure vulnerability for exploits targeting these structure
  	  types.
  
  	  Enabling this feature will introduce some performance impact,
  	  slightly increase memory usage, and prevent the use of forensic
  	  tools like Volatility against the system (unless the kernel
  	  source tree isn't cleaned after kernel installation).
  
  	  The seed used for compilation is located at
  	  scripts/gcc-plgins/randomize_layout_seed.h.  It remains after
  	  a make clean to allow for external modules to be compiled with
  	  the existing seed and will be removed by a make mrproper or
  	  make distclean.
  
  	  Note that the implementation requires gcc 4.7 or newer.
  
  	  This plugin was ported from grsecurity/PaX. More information at:
  	   * https://grsecurity.net/
  	   * https://pax.grsecurity.net/
  
  config GCC_PLUGIN_RANDSTRUCT_PERFORMANCE
  	bool "Use cacheline-aware structure randomization"
  	depends on GCC_PLUGIN_RANDSTRUCT
  	depends on !COMPILE_TEST	# do not reduce test coverage
  	help
  	  If you say Y here, the RANDSTRUCT randomization will make a
  	  best effort at restricting randomization to cacheline-sized
  	  groups of elements.  It will further not randomize bitfields
  	  in structures.  This reduces the performance hit of RANDSTRUCT
  	  at the cost of weakened randomization.

  config GCC_PLUGIN_ARM_SSP_PER_TASK
  	bool
  	depends on GCC_PLUGINS && ARM

  endmenu