inclyc added a comment. > That is OK for glibc system because glibc includes this file manually. But > with other libc (e.g. musl), which does not manually include this, clang will > fail but GCC can get it compiled.
FWIW currently we cannot build libedit using clang on x86_64-unknown-linux-musl and to fix this issue, they have a workaround here https://patchwork.ozlabs.org/project/buildroot/patch/1452127277-9538-1-git-send-email-sergio.pr...@e-labworks.com/ which manually defined `__STDC_ISO_10646__` Reproducer: #include <stdio.h> // #include <stdc-predef.h> int main() { printf("%d", __STDC_ISO_10646__); } GCC accepted this code but clang complained `use of undeclared identifier '__STDC_ISO_10646__'` test.c:5:15: error: use of undeclared identifier '__STDC_ISO_10646__' printf("%d", __STDC_ISO_10646__); ^ 1 error generated. Note that glibc includes `stdc-predefs.h` at the source-code level, so this problem cannot be reproduced on the glibc-based systems. (The header `stdio.h` actually #includes `stdc-predefs.h` in glibc!) However if we do not #include `stdio.h`, different behaviors can be seen on glibc platforms. int main() { return __STDC_ISO_10646__; } See https://godbolt.org/z/Gd9Kbn766. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D137043/new/ https://reviews.llvm.org/D137043 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
