# git rev-parse -q --verify d0ee23f9d78be5531c4b055ea424ed0b489dfe9b^{commit}
d0ee23f9d78be5531c4b055ea424ed0b489dfe9b
already have revision, skipping fetch
# git checkout -q -f -B kisskb d0ee23f9d78be5531c4b055ea424ed0b489dfe9b
# git clean -qxdf
# < git log -1
# commit d0ee23f9d78be5531c4b055ea424ed0b489dfe9b
# Author: Nathan Chancellor <nathan@kernel.org>
# Date:   Mon Sep 13 15:09:00 2021 -0700
# 
#     tools: compiler-gcc.h: Guard error attribute use with __has_attribute
#     
#     When building objtool with HOSTCC=clang, there are several errors along
#     the lines of
#     
#       orc_dump.c:201:28: error: unknown attribute 'error' ignored [-Werror,-Wunknown-attributes]
#     
#     This occurs after commit 4e59869aa655 ("compiler-gcc.h: drop checks for
#     older GCC versions"), which removed the GCC_VERSION gating.  The removed
#     version check just so happened to prevent __compiletime_error() from
#     being defined with clang because it pretends to be GCC 4.2.1 for
#     compatibility but the error attribute was not added to clang until
#     14.0.0.
#     
#     Commit 815f0ddb346c ("include/linux/compiler*.h: make compiler-*.h
#     mutually exclusive") and commit a3f8a30f3f00 ("Compiler Attributes: use
#     feature checks instead of version checks") refactored the handling of
#     attributes in the main kernel to avoid situations like this but that
#     refactoring has never been done for the tools directory.
#     
#     Refactoring is a rather large undertaking and this has never been an
#     issue before so instead, just guard the definition of
#     __compiletime_error() with __has_attribute() so that there are no more
#     errors.
#     
#     Fixes: 4e59869aa655 ("compiler-gcc.h: drop checks for older GCC versions")
#     Signed-off-by: Nathan Chancellor <nathan@kernel.org>
#     Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 d0ee23f9d78be5531c4b055ea424ed0b489dfe9b
# < make -s -j 8 ARCH=powerpc O=/kisskb/build/linus_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pseries_le_defconfig
# Added to kconfig CONFIG_PPC_SPLPAR=n
# < make -s -j 8 ARCH=powerpc O=/kisskb/build/linus_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 8 ARCH=powerpc O=/kisskb/build/linus_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 8 ARCH=powerpc O=/kisskb/build/linus_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
In file included from <command-line>:0:0:
/kisskb/src/include/linux/compiler_attributes.h:62:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__assume_aligned__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:62:20: error: missing binary operator before token "("
 #if __has_attribute(__assume_aligned__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:88:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__copy__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:88:20: error: missing binary operator before token "("
 #if __has_attribute(__copy__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:113:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__designated_init__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:113:20: error: missing binary operator before token "("
 #if __has_attribute(__designated_init__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:124:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__error__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:124:20: error: missing binary operator before token "("
 #if __has_attribute(__error__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:135:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__externally_visible__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:135:20: error: missing binary operator before token "("
 #if __has_attribute(__externally_visible__)
                    ^
In file included from <command-line>:0:0:
/kisskb/src/include/linux/compiler_attributes.h:171:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__no_caller_saved_registers__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:171:20: error: missing binary operator before token "("
 #if __has_attribute(__no_caller_saved_registers__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:182:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__noclone__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:182:20: error: missing binary operator before token "("
 #if __has_attribute(__noclone__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:199:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__fallthrough__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:199:20: error: missing binary operator before token "("
 #if __has_attribute(__fallthrough__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:226:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__nonstring__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:226:20: error: missing binary operator before token "("
 #if __has_attribute(__nonstring__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:238:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__no_profile_instrument_function__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:238:20: error: missing binary operator before token "("
 #if __has_attribute(__no_profile_instrument_function__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:296:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__warning__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:296:20: error: missing binary operator before token "("
 #if __has_attribute(__warning__)
                    ^
make[2]: *** [/kisskb/src/arch/powerpc/boot/Makefile:225: arch/powerpc/boot/crt0.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from <command-line>:0:0:
/kisskb/src/include/linux/compiler_attributes.h:62:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__assume_aligned__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:62:20: error: missing binary operator before token "("
 #if __has_attribute(__assume_aligned__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:88:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__copy__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:88:20: error: missing binary operator before token "("
 #if __has_attribute(__copy__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:113:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__designated_init__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:113:20: error: missing binary operator before token "("
 #if __has_attribute(__designated_init__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:124:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__error__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:124:20: error: missing binary operator before token "("
 #if __has_attribute(__error__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:135:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__externally_visible__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:135:20: error: missing binary operator before token "("
 #if __has_attribute(__externally_visible__)
                    ^
In file included from <command-line>:0:0:
/kisskb/src/include/linux/compiler_attributes.h:171:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__no_caller_saved_registers__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:171:20: error: missing binary operator before token "("
 #if __has_attribute(__no_caller_saved_registers__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:182:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__noclone__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:182:20: error: missing binary operator before token "("
 #if __has_attribute(__noclone__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:199:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__fallthrough__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:199:20: error: missing binary operator before token "("
 #if __has_attribute(__fallthrough__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:226:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__nonstring__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:226:20: error: missing binary operator before token "("
 #if __has_attribute(__nonstring__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:238:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__no_profile_instrument_function__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:238:20: error: missing binary operator before token "("
 #if __has_attribute(__no_profile_instrument_function__)
                    ^
/kisskb/src/include/linux/compiler_attributes.h:296:5: warning: "__has_attribute" is not defined [-Wundef]
 #if __has_attribute(__warning__)
     ^
/kisskb/src/include/linux/compiler_attributes.h:296:20: error: missing binary operator before token "("
 #if __has_attribute(__warning__)
                    ^
make[2]: *** [/kisskb/src/arch/powerpc/boot/Makefile:225: arch/powerpc/boot/div64.o] Error 1
make[1]: *** [/kisskb/src/arch/powerpc/Makefile:283: zImage] Error 2
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:219: __sub-make] Error 2
Command 'make -s -j 8 ARCH=powerpc O=/kisskb/build/linus_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ' returned non-zero exit status 2
# rm -rf /kisskb/build/linus_pseries_le_defconfig+NO_SPLPAR_powerpc-gcc5
# Build took: 0:05:06.856187