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Daniel Bristot de Oliveira 3ff3e6a936 tools/rtla: Fix Makefile compiler options for clang 
commit bc4cbc9d26 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@kernel.org

Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Justin Stitt <justinstitt@google.com>
Fixes: 1a7b22ab15 ("tools/rtla: Build with EXTRA_{C,LD}FLAGS")
Suggested-by: Donald Zickus <dzickus@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-02-23 09:12:45 +01:00
..
accounting
arch work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:12:28 +01:00
bootconfig
bpf bpftool: Use a local bpf_perf_event_value to fix accessing its fields 2023-09-13 09:42:30 +02:00
build perf cs-etm: Bump minimum OpenCSD version to ensure a bugfix is present 2024-02-05 20:12:58 +00:00
certs
cgroup
counter
debugging
edid
firewire
firmware
gpio
hv vmbus_testing: fix wrong python syntax for integer value comparison 2023-09-13 09:42:23 +02:00
iio tools: iio: iio_generic_buffer ensure alignment 2023-11-20 11:52:10 +01:00
include work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:12:28 +01:00
io_uring
kvm/kvm_stat
laptop
leds
lib libsubcmd: Fix memory leak in uniq() 2024-02-05 20:12:59 +00:00
memory-model
objtool objtool: Propagate early errors 2023-11-20 11:51:50 +01:00
pci
pcmcia
perf perf env: Avoid recursively taking env->bpf_progs.lock 2024-01-25 15:27:48 -08:00
power tools/power/turbostat: Enable the C-state Pre-wake printing 2023-11-28 17:07:06 +00:00
rcu
scripts
spi
testing selftests: mptcp: increase timeout to 30 min 2024-02-23 09:12:36 +01:00
thermal
time
tracing tools/rtla: Fix Makefile compiler options for clang 2024-02-23 09:12:45 +01:00
usb
verification
virtio
vm
wmi
Makefile