https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105377
Bug ID: 105377
Summary: Likely a misleading clang warning
-Wc++20-attribute-extensions
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: mpolacek at gcc dot gnu.org, redi at gcc dot gnu.org
Target Milestone: ---
I noticed the following warning:
clang++ -I/home/marxin/Programming/gcc/libcpp -I.
-I/home/marxin/Programming/gcc/libcpp/../include
-I/home/marxin/Programming/gcc/libcpp/include -g -O2 -W -Wall
-Wno-narrowing -Wwrite-strings -Wmissing-format-attribute -pedantic
-Wno-long-long -fno-exceptions -fno-rtti -I/home/marxin/Programming/gcc/libcpp
-I. -I/home/marxin/Programming/gcc/libcpp/../include
-I/home/marxin/Programming/gcc/libcpp/include -fPIC -fcf-protection -c -o
lex.o -MT lex.o -MMD -MP -MF .deps/lex.Tpo
/home/marxin/Programming/gcc/libcpp/lex.cc -std=c++17
/home/marxin/Programming/gcc/libcpp/lex.cc:1289:7: warning: use of the 'likely'
attribute is a C++20 extension [-Wc++20-attribute-extensions]
ATTR_LIKELY case kind::NONE:
^~~~~~~~~~~
/home/marxin/Programming/gcc/libcpp/system.h:427:25: note: expanded from macro
'ATTR_LIKELY'
# define ATTR_LIKELY [[likely]]
~~^~~~~~~~
