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authorAndrew Donnellan <andrew.donnellan@au1.ibm.com>2016-12-06 09:28:00 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2017-02-03 13:59:28 +0300
commit65c059bcaa73197ca71e8d4cc9a6c903560506c1 (patch)
tree45509696e28dba816368254c6372b0e9d1f31a7b
parenteac6f8b0c7adb003776dbad9d037ee2fc64f9d62 (diff)
downloadlinux-65c059bcaa73197ca71e8d4cc9a6c903560506c1.tar.xz
powerpc: Enable support for GCC plugins
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>
-rw-r--r--arch/powerpc/Kconfig1
-rw-r--r--scripts/Makefile.gcc-plugins8
2 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 33f5b8380a7d..bfdd80e7754c 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -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
diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
index 26c67b735dc9..9835a757d52a 100644
--- a/scripts/Makefile.gcc-plugins
+++ b/scripts/Makefile.gcc-plugins
@@ -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