# git rev-parse -q --verify cafa0010cd51fb711fdcb50fc55f394c5f167a0a^{commit}
cafa0010cd51fb711fdcb50fc55f394c5f167a0a
already have revision, skipping fetch
# git checkout -q -f -B kisskb cafa0010cd51fb711fdcb50fc55f394c5f167a0a
# git clean -qxdf
# < git log -1
# commit cafa0010cd51fb711fdcb50fc55f394c5f167a0a
# Author: Joe Perches <joe@perches.com>
# Date:   Mon Aug 20 13:15:26 2018 -0700
# 
#     Raise the minimum required gcc version to 4.6
#     
#     Various architectures fail to build properly with older versions of the
#     gcc compiler.
#     
#     An example from Guenter Roeck in thread [1]:
#     >
#     >   In file included from ./include/linux/mm.h:17:0,
#     >                    from ./include/linux/pid_namespace.h:7,
#     >                    from ./include/linux/ptrace.h:10,
#     >                    from arch/openrisc/kernel/asm-offsets.c:32:
#     >   ./include/linux/mm_types.h:497:16: error: flexible array member in otherwise empty struct
#     >
#     > This is just an example with gcc 4.5.1 for or32. I have seen the problem
#     > with gcc 4.4 (for unicore32) as well.
#     
#     So update the minimum required version of gcc to 4.6.
#     
#     [1] https://lore.kernel.org/lkml/20180814170904.GA12768@roeck-us.net/
#     
#     Miscellanea:
#     
#      - Update Documentation/process/changes.rst
#     
#      - Remove and consolidate version test blocks in compiler-gcc.h for
#        versions lower than 4.6
#     
#     Signed-off-by: Joe Perches <joe@perches.com>
#     Reviewed-by: Kees Cook <keescook@chromium.org>
#     Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-gcc --version
# < git log --format=%s --max-count=1 cafa0010cd51fb711fdcb50fc55f394c5f167a0a
# < make -s -j 8 ARCH=arm O=/kisskb/build/linus_at91_dt_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  at91_dt_defconfig
# make -s -j 8 ARCH=arm O=/kisskb/build/linus_at91_dt_defconfig_arm CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/arm-unknown-linux-gnueabi/bin/arm-unknown-linux-gnueabi-  
<stdin>:1332:2: warning: #warning syscall io_pgetevents not implemented [-Wcpp]
/kisskb/src/ipc/shm.c: In function 'ksys_shmdt':
/kisskb/src/ipc/shm.c:1658:59: warning: 'file' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl':
/kisskb/src/kernel/printk/printk.c:183:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c: In function 'proc_reg_open':
/kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/fs/proc/inode.c:339:21: note: 'pdeo' was declared here
/kisskb/src/lib/mpi/mpicoder.c: In function 'mpi_read_raw_from_sgl':
/kisskb/src/lib/mpi/mpicoder.c:336:12: warning: 'buff' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/core/gen_stats.c: In function '__gnet_stats_copy_basic':
/kisskb/src/net/core/gen_stats.c:161:19: warning: 'seq' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/core/dev.c: In function 'validate_xmit_skb_list':
/kisskb/src/net/core/dev.c:3344:15: warning: 'tail' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/dma-buf/reservation.c: In function 'reservation_object_add_shared_fence':
/kisskb/src/drivers/dma-buf/reservation.c:208:36: warning: 'k' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/dma-buf/reservation.c:161:17: note: 'k' was declared here
/kisskb/src/lib/rhashtable.c: In function 'rht_deferred_worker':
/kisskb/src/lib/rhashtable.c:267:2: warning: 'next' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/lib/rhashtable.c:232:28: note: 'next' was declared here
/kisskb/src/drivers/gpio/gpiolib-of.c: In function 'of_gpiochip_add':
/kisskb/src/drivers/gpio/gpiolib-of.c:390:8: warning: 'dflags' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/gpio/gpiolib-of.c:376:19: note: 'dflags' was declared here
/kisskb/src/drivers/gpio/gpiolib-of.c:390:8: warning: 'lflags' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/gpio/gpiolib-of.c:375:25: note: 'lflags' was declared here
/kisskb/src/drivers/gpu/drm/drm_dp_mst_topology.c: In function 'drm_dp_sideband_msg_build':
/kisskb/src/drivers/gpu/drm/drm_dp_mst_topology.c:364:23: warning: 'hdrlen' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c: In function 'ieee80211_rx_mgmt_beacon':
/kisskb/src/net/mac80211/mlme.c:1448:3: warning: 'pwr_level_cisco' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/net/mac80211/mlme.c:1405:6: note: 'pwr_level_cisco' was declared here
/kisskb/src/drivers/gpu/drm/drm_atomic.c: In function 'drm_atomic_check_only':
/kisskb/src/drivers/gpu/drm/drm_atomic.c:760:38: warning: 'crtc_state' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/gpu/drm/drm_atomic.c:744:25: note: 'crtc_state' was declared here
/kisskb/src/drivers/mtd/ubi/eba.c: In function 'try_write_vid_and_data':
/kisskb/src/drivers/mtd/ubi/eba.c:1001:7: warning: 'opnum' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/pwm/pwm-atmel-hlcdc.c: In function 'atmel_hlcdc_pwm_apply':
/kisskb/src/drivers/pwm/pwm-atmel-hlcdc.c:78:56: warning: 'clk_period_ns' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/rtc/rtc-rv3029c2.c: In function 'rv3029_probe':
/kisskb/src/drivers/rtc/rtc-rv3029c2.c:664:3: warning: 'elem' may be used uninitialized in this function [-Wuninitialized]
/kisskb/src/drivers/rtc/rtc-rv3029c2.c:643:40: note: 'elem' was declared here
Completed OK
# rm -rf /kisskb/build/linus_at91_dt_defconfig_arm
# Build took: 0:01:14.664687