# git rev-parse -q --verify 21f9c8a13bb2a0c24d9c6b86bc0896542a28c197^{commit}
21f9c8a13bb2a0c24d9c6b86bc0896542a28c197
already have revision, skipping fetch
# git checkout -q -f -B kisskb 21f9c8a13bb2a0c24d9c6b86bc0896542a28c197
# git clean -qxdf
# < git log -1
# commit 21f9c8a13bb2a0c24d9c6b86bc0896542a28c197
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Thu Aug 11 08:40:01 2022 -0700
# 
#     Revert "Makefile.extrawarn: re-enable -Wformat for clang"
#     
#     This reverts commit 258fafcd0683d9ccfa524129d489948ab3ddc24c.
#     
#     The clang -Wformat warning is terminally broken, and the clang people
#     can't seem to get their act together.
#     
#     This test program causes a warning with clang:
#     
#             #include <stdio.h>
#     
#             int main(int argc, char **argv)
#             {
#                     printf("%hhu\n", 'a');
#             }
#     
#     resulting in
#     
#       t.c:5:19: warning: format specifies type 'unsigned char' but the argument has type 'int' [-Wformat]
#               printf("%hhu\n", 'a');
#                       ~~~~     ^~~
#                       %d
#     
#     and apparently clang people consider that a feature, because they don't
#     want to face the reality of how either C character constants, C
#     arithmetic, and C varargs functions work.
#     
#     The rest of the world just shakes their head at that kind of
#     incompetence, and turns off -Wformat for clang again.
#     
#     And no, the "you should use a pointless cast to shut this up" is not a
#     valid answer.  That warning should not exist in the first place, or at
#     least be optinal with some "-Wformat-me-harder" kind of option.
#     
#     [ Admittedly, there's also very little reason to *ever* use '%hh[ud]' in
#       C, but what little reason there is is entirely about 'I want to see
#       only the low 8 bits of the argument'. So I would suggest nobody ever
#       use that format in the first place, but if they do, the clang
#       behavious is simply always wrong. Because '%hhu' takes an 'int'. It's
#       that simple. ]
#     
#     Reported-by: Sudip Mukherjee (Codethink) <sudipm.mukherjee@gmail.com>
#     Cc: Nick Desaulniers <ndesaulniers@google.com>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 21f9c8a13bb2a0c24d9c6b86bc0896542a28c197
# < make -s -j 120 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 allyesconfig
# Added to kconfig CONFIG_STANDALONE=y
# Added to kconfig CONFIG_KCOV=n
# Added to kconfig CONFIG_GCC_PLUGINS=n
# Added to kconfig CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=n
# Added to kconfig CONFIG_GCC_PLUGIN_SANCOV=n
# Added to kconfig CONFIG_GCC_PLUGIN_LATENT_ENTROPY=n
# Added to kconfig CONFIG_GCC_PLUGIN_STRUCTLEAK=n
# Added to kconfig CONFIG_GCC_PLUGIN_RANDSTRUCT=n
# Added to kconfig CONFIG_UML_NET=n
# Added to kconfig CONFIG_UML_NET_ETHERTAP=n
# Added to kconfig CONFIG_UML_NET_TUNTAP=n
# Added to kconfig CONFIG_UML_NET_SLIP=n
# Added to kconfig CONFIG_UML_NET_DAEMON=n
# Added to kconfig CONFIG_UML_NET_VDE=n
# Added to kconfig CONFIG_UML_NET_MCAST=n
# Added to kconfig CONFIG_UML_NET_PCAP=n
# Added to kconfig CONFIG_UML_NET_SLIRP=n
# Added to kconfig CONFIG_GCOV_KERNEL=n
# Added to kconfig CONFIG_DEBUG_INFO_BTF=n
# Added to kconfig CONFIG_BPF_PRELOAD=n
# < make -s -j 120 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 help
# make -s -j 120 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 olddefconfig
.config:12671:warning: override: reassigning to symbol GCC_PLUGIN_SANCOV
.config:12676:warning: override: reassigning to symbol UML_NET_ETHERTAP
.config:12678:warning: override: reassigning to symbol UML_NET_SLIP
.config:12681:warning: override: reassigning to symbol UML_NET_MCAST
.config:12683:warning: override: reassigning to symbol UML_NET_SLIRP
# make -s -j 120 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 
/kisskb/src/arch/um/os-Linux/util.c:17:24: fatal error: sys/random.h: No such file or directory
compilation terminated.
make[2]: *** [/kisskb/src/scripts/Makefile.build:249: arch/um/os-Linux/util.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/kisskb/src/Makefile:1855: arch/um/os-Linux] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:222: __sub-make] Error 2
Command 'make -s -j 120 ARCH=um O=/kisskb/build/linus_um-allyesconfig_um-x86_64 CROSS_COMPILE=/opt/cross/kisskb/fe-x86-64-core-i7-2017.05/bin/x86_64-linux- SUBARCH=x86_64 ' returned non-zero exit status 2
# rm -rf /kisskb/build/linus_um-allyesconfig_um-x86_64
# Build took: 0:00:56.780973