This is a note to let you know that I've just added the patch titled
tools/rtla: Fix Makefile compiler options for clang
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tools-rtla-fix-makefile-compiler-options-for-clang.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From bc4cbc9d260ba8358ca63662919f4bb223cb603b Mon Sep 17 00:00:00 2001
From: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Date: Tue, 6 Feb 2024 12:05:29 +0100
Subject: tools/rtla: Fix Makefile compiler options for clang
From: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
commit bc4cbc9d260ba8358ca63662919f4bb223cb603b upstream.
The following errors are showing up when compiling rtla with clang:
$ make HOSTCC=clang CC=clang LLVM_IAS=1
[...]
clang -O -g -DVERSION=\"6.8.0-rc1\" -flto=auto -ffat-lto-objects
-fexceptions -fstack-protector-strong
-fasynchronous-unwind-tables -fstack-clash-protection -Wall
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS -Wno-maybe-uninitialized
$(pkg-config --cflags libtracefs) -c -o src/utils.o src/utils.c
clang: warning: optimization flag '-ffat-lto-objects' is not supported [-Wignored-optimization-argument]
warning: unknown warning option '-Wno-maybe-uninitialized'; did you mean '-Wno-uninitialized'? [-Wunknown-warning-option]
1 warning generated.
clang -o rtla -ggdb src/osnoise.o src/osnoise_hist.o src/osnoise_top.o
src/rtla.o src/timerlat_aa.o src/timerlat.o src/timerlat_hist.o
src/timerlat_top.o src/timerlat_u.o src/trace.o src/utils.o $(pkg-config --libs libtracefs)
src/osnoise.o: file not recognized: file format not recognized
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [Makefile:110: rtla] Error 1
Solve these issues by:
- removing -ffat-lto-objects and -Wno-maybe-uninitialized if using clang
- informing the linker about -flto=auto
Link: https://lore.kernel.org/linux-trace-kernel/567ac1b94effc228ce9a0225b9df7232a9b35b55.1707217097.git.bristot@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Bill Wendling <morbo@xxxxxxxxxx>
Cc: Justin Stitt <justinstitt@xxxxxxxxxx>
Fixes: 1a7b22ab15eb ("tools/rtla: Build with EXTRA_{C,LD}FLAGS")
Suggested-by: Donald Zickus <dzickus@xxxxxxxxxx>
Signed-off-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/tracing/rtla/Makefile | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/tools/tracing/rtla/Makefile
+++ b/tools/tracing/rtla/Makefile
@@ -28,10 +28,15 @@ FOPTS := -flto=auto -ffat-lto-objects -f
-fasynchronous-unwind-tables -fstack-clash-protection
WOPTS := -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -Wno-maybe-uninitialized
+ifeq ($(CC),clang)
+ FOPTS := $(filter-out -ffat-lto-objects, $(FOPTS))
+ WOPTS := $(filter-out -Wno-maybe-uninitialized, $(WOPTS))
+endif
+
TRACEFS_HEADERS := $$($(PKG_CONFIG) --cflags libtracefs)
CFLAGS := -O -g -DVERSION=\"$(VERSION)\" $(FOPTS) $(MOPTS) $(WOPTS) $(TRACEFS_HEADERS) $(EXTRA_CFLAGS)
-LDFLAGS := -ggdb $(EXTRA_LDFLAGS)
+LDFLAGS := -flto=auto -ggdb $(EXTRA_LDFLAGS)
LIBS := $$($(PKG_CONFIG) --libs libtracefs)
SRC := $(wildcard src/*.c)
Patches currently in stable-queue which might be from bristot@xxxxxxxxxx are
queue-6.6/tools-rtla-replace-setting-prio-with-nice-for-sched_other.patch
queue-6.6/tools-rv-fix-makefile-compiler-options-for-clang.patch
queue-6.6/tools-rtla-fix-uninitialized-bucket-data-bucket_size-warning.patch
queue-6.6/tools-rtla-exit-with-exit_success-when-help-is-invoked.patch
queue-6.6/tools-rtla-fix-clang-warning-about-mount_point-var-size.patch
queue-6.6/tools-rv-fix-curr_reactor-uninitialized-variable.patch
queue-6.6/tools-rtla-fix-makefile-compiler-options-for-clang.patch
queue-6.6/tracing-timerlat-move-hrtimer_init-to-timerlat_fd-open.patch
queue-6.6/tools-rtla-remove-unused-sched_getattr-function.patch
