On Jun 8, 2024, at 12:38 PM, Paul Eggert <egg...@cs.ucla.edu> wrote: > (Moving this from <https://savannah.gnu.org/support/?111072> to > <mailto:bug-gnulib@gnu.org> because it's Gnulib, not Autoconf.]
Sorry. >> Recently, I started getting warnings like: >> ./slist.h:170:1: warning: [[]] attributes are a C23 extension >> [-Wc23-extensions] >> 170 | NODISCARD >> | ^ >> ../lib/attribute.h:143:19: note: expanded from macro 'NODISCARD' >> 143 | #define NODISCARD _GL_ATTRIBUTE_NODISCARD >> | ^ >> ./config.h:1392:37: note: expanded from macro '_GL_ATTRIBUTE_NODISCARD' >> 1392 | # define _GL_ATTRIBUTE_NODISCARD [[__nodiscard__]] >> | ^ > > It looks like -Wc23-extensions is the problem. If you stop using it (or if > you also use -std=gnu23), you shouldn't get those warnings. At least, that's > the behavior I see with clang 18.1.6 (a bit later than your clang) on Fedora. FYI, I’m not using that option. The options I am using are: -DHAVE_CONFIG_H -D_THREAD_SAFE -D_ISOC11_SOURCE -Wall -Wcast-align -Wcast-function-type -Wcomma -Wconditional-type-mismatch -Wconditional-uninitialized -Wconversion -Wduplicate-enum -Wembedded-directive -Wenum-enum-conversion -Wenum-float-conversion -Wextra -Wfloat-equal -Wfor-loop-analysis -Wformat-nonliteral -Wformat-type-confusion -Wformat=2 -Widiomatic-parentheses -Wimplicit-fallthrough -Wlogical-op-parentheses -Wmisleading-indentation -Wnewline-eof -Wpedantic -Wredundant-decls -Wshadow -Wshift-sign-overflow -Wshorten-64-to-32 -Wsign-compare -Wsign-conversion -Wsometimes-uninitialized -Wstring-conversion -Wtautological-compare -Wtautological-type-limit-compare -Wundef -Wuninitialized -Wunreachable-code-break -Wunreachable-code-return -Wunreachable-code -Wunused -Wwrite-strings -Wzero-as-null-pointer-constant - Paul
