[gentoo-commits] proj/linux-patches:6.1 commit in: /

["Mike Pagano" <mpagano@gentoo.org>]

commit:     e34c0cb7d58c06e7245d9f5347d5da8e817b95ce
Author:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
AuthorDate: Thu Feb  2 19:01:33 2023 +0000
Commit:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
CommitDate: Thu Feb  2 19:01:33 2023 +0000
URL:        https://gitweb.gentoo.org/proj/linux-patches.git/commit/?id=e34c0cb7

gcc-plugins: drop -std=gnu++11 to fix GCC 13 build

See: https://lore.kernel.org/all/20230201230009.2252783-1-sam <AT> gentoo.org/

Signed-off-by: Mike Pagano <mpagano <AT> gentoo.org>

 0000_README                                        |  4 ++
 ...rop-std-gnu-plus-plus-to-fix-GCC-13-build.patch | 46 ++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/0000_README b/0000_README
index 0965d9a9..1f899f11 100644
--- a/0000_README
+++ b/0000_README
@@ -115,6 +115,10 @@ Patch:	2930_gcc-plugins-Reorg-gimple-incs-for-gcc-13.patch
 From:   https://lore.kernel.org/lkml/mhng-8bc81919-3023-4d72-bd44-2443606b4fd7@palmer-ri-x1c9a/T/
 Desc:   gcc-plugins: Reorganize gimple includes for GCC 13
 
+Patch:  2940_gcc-plugins-drop-std-gnu-plus-plus-to-fix-GCC-13-build.patch
+From:   https://lore.kernel.org/all/20230201230009.2252783-1-sam@gentoo.org/
+Desc:   gcc-plugins: drop -std=gnu++11 to fix GCC 13 build
+
 Patch:  3000_Support-printing-firmware-info.patch
 From:   https://bugs.gentoo.org/732852
 Desc:   Print firmware info (Reqs CONFIG_GENTOO_PRINT_FIRMWARE_INFO). Thanks to Georgy Yakovlev

diff --git a/2940_gcc-plugins-drop-std-gnu-plus-plus-to-fix-GCC-13-build.patch b/2940_gcc-plugins-drop-std-gnu-plus-plus-to-fix-GCC-13-build.patch
new file mode 100644
index 00000000..55797805
--- /dev/null
+++ b/2940_gcc-plugins-drop-std-gnu-plus-plus-to-fix-GCC-13-build.patch
@@ -0,0 +1,46 @@
+From 5a6b64adc18d9adfb497a529ff004d59b6df151f Mon Sep 17 00:00:00 2001
+From: Sam James <sam@gentoo.org>
+Date: Wed, 1 Feb 2023 23:00:09 +0000
+Subject: gcc-plugins: drop -std=gnu++11 to fix GCC 13 build
+
+The latest GCC 13 snapshot (13.0.1 20230129) gives the following:
+```
+cc1: error: cannot load plugin ./scripts/gcc-plugins/randomize_layout_plugin.so
+ :./scripts/gcc-plugins/randomize_layout_plugin.so: undefined symbol: tree_code_type
+```
+
+This ends up being because of https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=b0241ce6e37031
+upstream in GCC which changes the visibility of some types used by the kernel's
+plugin infrastructure like tree_code_type.
+
+After discussion with the GCC folks, we found that the kernel needs to be building
+plugins with the same flags used to build GCC - and GCC defaults to gnu++17
+right now. The minimum GCC version needed to build the kernel is GCC 5.1
+and GCC 5.1 already defaults to gnu++14 anyway, so just drop the flag, as
+all GCCs that could be used to build GCC already default to an acceptable
+version which was >= the version we forced via flags until now.
+
+Bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108634
+Signed-off-by: Sam James <sam@gentoo.org>
+Signed-off-by: Kees Cook <keescook@chromium.org>
+Link: https://lore.kernel.org/r/20230201230009.2252783-1-sam@gentoo.org
+---
+ scripts/gcc-plugins/Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
+index b34d11e226366..320afd3cf8e82 100644
+--- a/scripts/gcc-plugins/Makefile
++++ b/scripts/gcc-plugins/Makefile
+@@ -29,7 +29,7 @@ GCC_PLUGINS_DIR = $(shell $(CC) -print-file-name=plugin)
+ plugin_cxxflags	= -Wp,-MMD,$(depfile) $(KBUILD_HOSTCXXFLAGS) -fPIC \
+ 		  -include $(srctree)/include/linux/compiler-version.h \
+ 		  -DPLUGIN_VERSION=$(call stringify,$(KERNELVERSION)) \
+-		  -I $(GCC_PLUGINS_DIR)/include -I $(obj) -std=gnu++11 \
++		  -I $(GCC_PLUGINS_DIR)/include -I $(obj) \
+ 		  -fno-rtti -fno-exceptions -fasynchronous-unwind-tables \
+ 		  -ggdb -Wno-narrowing -Wno-unused-variable \
+ 		  -Wno-format-diag
+-- 
+cgit 
+