# git rev-parse -q --verify c67a85bee78db74c6889a5ca645c3763ad23d863^{commit}
c67a85bee78db74c6889a5ca645c3763ad23d863
already have revision, skipping fetch
# git checkout -q -f -B kisskb c67a85bee78db74c6889a5ca645c3763ad23d863
# git clean -qxdf
# < git log -1
# commit c67a85bee78db74c6889a5ca645c3763ad23d863
# Author: Nick Desaulniers <ndesaulniers@google.com>
# Date:   Fri Oct 14 09:53:02 2022 -0700
# 
#     kbuild: add -fno-discard-value-names to cmd_cc_ll_c
#     
#     When debugging LLVM IR, it can be handy for clang to not discard value
#     names used for local variables and parameters. Compare the generated IR.
#     
#     -fdiscard-value-names:
#       define i32 @core_sys_select(i32 %0, ptr %1, ptr %2, ptr %3, ptr %4) {
#         %6 = alloca i64
#         %7 = alloca %struct.poll_wqueues
#         %8 = alloca [64 x i32]
#     
#     -fno-discard-value-names:
#       define i32 @core_sys_select(i32 %n, ptr %inp, ptr %outp, ptr %exp,
#                                   ptr %end_time) {
#         %expire.i = alloca i64
#         %table.i = alloca %struct.poll_wqueues
#         %stack_fds = alloca [64 x i32]
#     
#     The rule for generating human readable LLVM IR (.ll) is only useful as a
#     debugging feature:
#     
#     $ make LLVM=1 fs/select.ll
#     
#     As Fangrui notes:
#       A LLVM_ENABLE_ASSERTIONS=off build of Clang defaults to
#       -fdiscard-value-names.
#     
#       A LLVM_ENABLE_ASSERTIONS=on build of Clang defaults to
#       -fno-discard-value-names.
#     
#     Explicitly enable -fno-discard-value-names so that the IR always contains
#     value names regardless of whether assertions were enabled or not.
#     Assertions generally are not enabled in releases of clang packaged by
#     distributions.
#     
#     Link: https://github.com/ClangBuiltLinux/linux/issues/1467
#     Reviewed-by: Nathan Chancellor <nathan@kernel.org>
#     Reviewed-by: Fangrui Song <maskray@google.com>
#     Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
#     Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 c67a85bee78db74c6889a5ca645c3763ad23d863
# < make -s -j 32 ARCH=x86 O=/kisskb/build/kbuild_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  x86_64_defconfig
# < make -s -j 32 ARCH=x86 O=/kisskb/build/kbuild_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 32 ARCH=x86 O=/kisskb/build/kbuild_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
# make -s -j 32 ARCH=x86 O=/kisskb/build/kbuild_x86_64_defconfig_x86_64-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/kbuild_x86_64_defconfig_x86_64-gcc8
# Build took: 0:02:15.638486