How to treat warnings not as errors....

[Marietto2008]

Hello bro.

I'm trying to recompile the kernel 4.9 for my Jetson nano using your latest patches,but I'm not able to compile the code. Can you give me some help ? thanks.

# git clone https://github.com/OE4T/linux-tegra-4.9.git

# cd linux-tegra-4.9

# git checkout oe4t-patches-l4t-r32.7.4

# cp /proc/config.gz .

# gunzip config.gz

# mv config .config

# CFLAGS=-Wno-error make -j4

  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CC      kernel/rcu/sync.o
  CC      mm/nobootmem.o
In file included from ./include/trace/define_trace.h:95:0,
                 from ./include/trace/events/sched.h:1113,
                 from kernel/sched/core.c:96:
./include/trace/events/sched.h: In function ‘trace_raw_output_sched_load_avg_task’:
./include/trace/events/sched.h:666:12: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 10 has type ‘long unsigned int’ [-Wformat=]
  TP_printk("comm=%s pid=%d cpu=%d load_avg=%lu util_avg=%lu util_fast_avg=%lu"
            ^
./include/trace/events/sched.h:676:5:
     (unsigned long)__entry->util_avg_walt,
     ~~~~~~~~~~~~~~~~~~~~~~~~~
./include/trace/trace_events.h:327:22: note: in definition of macro ‘DECLARE_EVENT_CLASS’
  trace_seq_printf(s, print);     \
                      ^~~~~
./include/trace/trace_events.h:65:9: note: in expansion of macro ‘PARAMS’
         PARAMS(print));         \
         ^~~~~~
./include/trace/events/sched.h:626:1: note: in expansion of macro ‘TRACE_EVENT’
 TRACE_EVENT(sched_load_avg_task,
 ^~~~~~~~~~~
./include/trace/events/sched.h:666:2: note: in expansion of macro ‘TP_printk’
  TP_printk("comm=%s pid=%d cpu=%d load_avg=%lu util_avg=%lu util_fast_avg=%lu"
  ^~~~~~~~~
In file included from ./include/trace/trace_events.h:361:0,
                 from ./include/trace/define_trace.h:95,
                 from ./include/trace/events/sched.h:1113,
                 from kernel/sched/core.c:96:
./include/trace/events/sched.h:667:38: note: format string is defined here
    "util_avg_pelt=%lu util_avg_walt=%u load_sum=%llu"
                                     ~^
                                     %lu
In file included from ./include/trace/define_trace.h:95:0,
                 from ./include/trace/events/sched.h:1113,
                 from kernel/sched/core.c:96:
./include/trace/events/sched.h: In function ‘trace_raw_output_sched_load_avg_cpu’:
./include/trace/events/sched.h:715:12: warning: format ‘%u’ expects argument of type ‘unsigned int’, but argument 8 has type ‘long unsigned int’ [-Wformat=]
  TP_printk("cpu=%d load_avg=%lu util_avg=%lu util_fast_avg=%lu "
            ^
./include/trace/events/sched.h:719:29:
     __entry->util_avg_pelt, (unsigned long)__entry->util_avg_walt)
                             ~~~~~~~~~~~~~~~~~~~~~~~~~
./include/trace/trace_events.h:327:22: note: in definition of macro ‘DECLARE_EVENT_CLASS’
  trace_seq_printf(s, print);     \
                      ^~~~~
./include/trace/trace_events.h:65:9: note: in expansion of macro ‘PARAMS’
         PARAMS(print));         \
         ^~~~~~
./include/trace/events/sched.h:685:1: note: in expansion of macro ‘TRACE_EVENT’
 TRACE_EVENT(sched_load_avg_cpu,
 ^~~~~~~~~~~
./include/trace/events/sched.h:715:2: note: in expansion of macro ‘TP_printk’
  TP_printk("cpu=%d load_avg=%lu util_avg=%lu util_fast_avg=%lu "
  ^~~~~~~~~
In file included from ./include/trace/trace_events.h:361:0,
                 from ./include/trace/define_trace.h:95,
                 from ./include/trace/events/sched.h:1113,
                 from kernel/sched/core.c:96:
./include/trace/events/sched.h:716:40: note: format string is defined here
      "util_avg_pelt=%lu util_avg_walt=%u",
                                       ~^
                                       %lu
  CC      kernel/rcu/srcu.o
  CC      fs/fs_pin.o
    CC [M]  sound/drivers/mpu401/mpu401_uart.o
  CC      sound/core/sound.o
sound/core/sound.c: In function ‘snd_request_other’:
sound/core/sound.c:89:2: warning: format not a string literal and no format arguments [-Wformat-security]
  request_module(str);
  ^~~~~~~~~~~~~~
  CC      drivers/base/firmware.o
  CC      sound/core/init.o
  LD [M]  sound/drivers/mpu401/snd-mpu401-uart.o
  LD      sound/drivers/opl3/built-in.o
  CC [M]  sound/drivers/opl3/opl3_lib.o
  CC [M]  fs/fscache/proc.o
  CC      drivers/base/init.o
  LD [M]  fs/fscache/fscache.o
  LD      fs/fuse/built-in.o
  CC [M]  fs/fuse/dev.o
  CC      drivers/base/map.o
  CC      sound/core/memory.o
  CC [M]  sound/drivers/opl3/opl3_synth.o
  CC      drivers/base/devres.o
  CC      sound/core/control.o
  CC [M]  sound/drivers/opl3/opl3_seq.o
sound/drivers/opl3/opl3_seq.c: In function ‘snd_opl3_seq_probe’:
sound/drivers/opl3/opl3_seq.c:240:11: warning: format not a string literal and no format arguments [-Wformat-security]
           name);
           ^~~~
  CC      drivers/base/attribute_container.o
  CC [M]  sound/drivers/opl3/opl3_midi.o
  CC [M]  fs/fuse/dir.o
  CC      drivers/base/transport_class.o
  CC [M]  sound/drivers/opl3/opl3_drums.o
  CC      sound/core/misc.o
  LD [M]  sound/drivers/opl3/snd-opl3-lib.o
  LD [M]  sound/drivers/opl3/snd-opl3-synth.o
  LD      sound/drivers/opl4/built-in.o
  LD      sound/drivers/pcsp/built-in.o
  LD      sound/drivers/vx/built-in.o
  CC [M]  sound/drivers/aloop.o
  CC      drivers/base/topology.o
  CC [M]  fs/fuse/file.o
  CC      drivers/base/container.o
  CC      sound/core/device.o
  CC      drivers/base/property.o
  LD      sound/drivers/built-in.o
  LD [M]  sound/drivers/snd-aloop.o
  LD      sound/firewire/built-in.o
  CC      sound/hda/hda_bus_type.o
  CC      sound/core/info.o
  CC      sound/hda/hdac_bus.o
  CC      sound/core/vmaster.o
  CC      drivers/base/cacheinfo.o
  CC [M]  fs/fuse/inode.o
  CC      sound/hda/hdac_device.o
  CC      sound/core/ctljack.o
  CC      drivers/base/devtmpfs.o
  CC      sound/core/jack.o
  CC      sound/hda/hdac_sysfs.o
  CC      drivers/base/dma-contiguous.o
  CC [M]  fs/fuse/control.o
  CC      sound/core/hwdep.o
  CC      sound/hda/hdac_regmap.o
  CC      drivers/base/power/sysfs.o
drivers/base/power/sysfs.c: In function ‘rtpm_status_show’:
drivers/base/power/sysfs.c:184:2: error: format not a string literal and no format arguments [-Werror=format-security]
  return sprintf(buf, p);
  ^~~~~~
  CC [M]  fs/fuse/xattr.o
cc1: all warnings being treated as errors
make[3]: *** [scripts/Makefile.build:338: drivers/base/power/sysfs.o] Errore 1
make[2]: *** [scripts/Makefile.build:652: drivers/base/power] Errore 2
make[1]: *** [scripts/Makefile.build:652: drivers/base] Errore 2
make: *** [Makefile:1122: drivers] Errore 2
make: *** Attesa per i processi non terminati....
  CC [M]  fs/fuse/acl.o
  CC      sound/hda/hdac_controller.o
  CC      sound/core/timer.o
  CC [M]  fs/fuse/cuse.o
  LD [M]  fs/fuse/fuse.o
    CC [M]  sound/pci/emu10k1/emu10k1x.o
In file included from sound/core/seq/seq_info.h:24:0,
                 from sound/core/seq/seq_clientmgr.c:36:
sound/core/seq/seq_clientmgr.c: In function ‘snd_seq_info_dump_subscribers’:
./include/sound/info.h:123:21: warning: format not a string literal and no format arguments [-Wformat-security]
  seq_printf((struct seq_file *)(buf)->buffer, fmt, ##args)
                     ^
sound/core/seq/seq_clientmgr.c:2411:2: note: in expansion of macro ‘snd_iprintf’
  snd_iprintf(buffer, msg);
  ^~~~~~~~~~~
  LD      fs/jbd2/jbd2.o
  LD      fs/jbd2/built-in.o
    LD [M]  fs/overlayfs/overlay.o
  CC      fs/proc/task_mmu.o
sound/usb/mixer_quirks.c: In function ‘snd_create_std_mono_ctl_offset’:
sound/usb/mixer_quirks.c:103:2: warning: format not a string literal and no format arguments [-Wformat-security]
  snprintf(kctl->id.name, sizeof(kctl->id.name), name);
  ^~~~~~~~
  CC      fs/ntfs/file.o
  CC      sound/usb/mixer_scarlett.o
   LD      fs/pstore/built-in.o
  CC      fs/quota/quota_v2.o
fs/quota/dquot.c: In function ‘find_quota_format’:
fs/quota/dquot.c:202:7: warning: format not a string literal and no format arguments [-Wformat-security]
       request_module(module_names[qm].qm_mod_name))
       ^~~~~~~~~~~~~~
  CC      fs/quota/quota_tree.o
  LD      fs/proc/proc.o
   LD      fs/built-in.o

# make -j4 Image

  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CHK     scripts/mod/devicetable-offsets.h
  CHK     include/generated/timeconst.h
  CHK     include/generated/bounds.h
  CHK     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  CHK     kernel/config_data.h
  CC      drivers/base/power/sysfs.o
  CC      net/socket.o
drivers/base/power/sysfs.c: In function ‘rtpm_status_show’:
drivers/base/power/sysfs.c:184:2: error: format not a string literal and no format arguments [-Werror=format-security]
  return sprintf(buf, p);
  ^~~~~~
cc1: all warnings being treated as errors
make[3]: *** [scripts/Makefile.build:338: drivers/base/power/sysfs.o] Errore 1
make[2]: *** [scripts/Makefile.build:652: drivers/base/power] Errore 2
make[1]: *** [scripts/Makefile.build:652: drivers/base] Errore 2
make: *** [Makefile:1122: drivers] Errore 2
make: *** Attesa per i processi non terminati....
  CC      net/802/p8022.o
  CC      net/802/psnap.o

root@jetson:/home/aresuser/Desktop/antmicro/linux-tegra-4.9# find . -name Image
nothing

[madisongh]

I think the environment variable you would use is KBUILD_CFLAGS.

[Marietto2008]

like this ? ---> KBUILD_CFLAGS=-Wno-error make -j4 ?

[madisongh]

I think so, yes. I always cross-compile using a controlled build environment that sets things up correctly for me, so I may be misremembering. With the right version of the toolchain and the right build environment, you shouldn't need to disable errors globally during the kernel build.

[Marietto2008]

The point is that I'm not an experienced user. I'm an hobbyst. Rarely I'm sure about what are the proper toolchains and build environments. Usually I use google to find a case similar to mine and then I apply the trial and error tecnique.