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powerpc: Enable support for GCC plugins

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Enable support for GCC plugins on powerpc.

Add an additional version check in gcc-plugins-check to advise users to
upgrade to gcc 5.2+ on powerpc to avoid issues with header files (gcc <=
4.6) or missing copies of rs6000-cpus.def (4.8 to 5.1 on 64-bit
targets).

Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Andrew Donnellan 2016-12-06 17:28:00 +11:00 committed by Michael Ellerman
parent eac6f8b0c7
commit 65c059bcaa
2 changed files with 9 additions and 0 deletions
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1
arch/powerpc/Kconfig
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@ -93,6 +93,7 @@ config PPC
select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_GCC_PLUGINS
select SYSCTL_EXCEPTION_TRACE
select VIRT_TO_BUS if !PPC64
select HAVE_IDE

8
scripts/Makefile.gcc-plugins
View File

@ -47,6 +47,14 @@ gcc-plugins-check: FORCE
ifdef CONFIG_GCC_PLUGINS
ifeq ($(PLUGINCC),)
ifneq ($(GCC_PLUGINS_CFLAGS),)
# Various gccs between 4.5 and 5.1 have bugs on powerpc due to missing
# header files. gcc <= 4.6 doesn't work at all, gccs from 4.8 to 5.1 have
# issues with 64-bit targets.
ifeq ($(ARCH),powerpc)
ifeq ($(call cc-ifversion, -le, 0501, y), y)
@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
endif
endif
ifeq ($(call cc-ifversion, -ge, 0405, y), y)
$(Q)$(srctree)/scripts/gcc-plugin.sh --show-error "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)" || true
@echo "Cannot use CONFIG_GCC_PLUGINS: your gcc installation does not support plugins, perhaps the necessary headers are missing?" >&2 && exit 1