Note that this has been modified from the original commit, to use __has_include instead of __has_include__, as the later was causing build failures with GCC 10. See also: http://lists.busybox.net/pipermail/buildroot/2020-July/590376.html. https://sourceware.org/git/?p=glibc.git;a=commit;h=0b9c84906f653978fb8768c7ebd0ee14a47e662e This patch can be dropped when we are building with glibc 2.28+. From 562c52cc81a4e456a62e6455feb32732049e9070 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Mon, 31 Dec 2018 09:26:42 -0800 Subject: [PATCH] riscv: Use __has_include__ to include [BZ #24022] has been removed by commit 27f8899d6002e11a6e2d995e29b8deab5aa9cc25 Author: David Abdurachmanov Date: Thu Nov 8 20:02:39 2018 +0100 riscv: add asm/unistd.h UAPI header Marcin Juszkiewicz reported issues while generating syscall table for riscv using 4.20-rc1. The patch refactors our unistd.h files to match some other architectures. - Add asm/unistd.h UAPI header, which has __ARCH_WANT_NEW_STAT only for 64-bit - Remove asm/syscalls.h UAPI header and merge to asm/unistd.h - Adjust kernel asm/unistd.h So now asm/unistd.h UAPI header should show all syscalls for riscv. may be restored by Subject: [PATCH] riscv: restore asm/syscalls.h UAPI header Date: Tue, 11 Dec 2018 09:09:35 +0100 UAPI header asm/syscalls.h was merged into UAPI asm/unistd.h header, which did resolve issue with missing syscalls macros resulting in glibc (2.28) build failure. It also broke glibc in a different way: asm/syscalls.h is being used by glibc. I noticed this while doing Fedora 30/Rawhide mass rebuild. The patch returns asm/syscalls.h header and incl. it into asm/unistd.h. I plan to send a patch to glibc to use asm/unistd.h instead of asm/syscalls.h In the meantime, we use __has_include__, which was added to GCC 5, to check if exists before including it. Tested with build-many-glibcs.py for riscv against kernel 4.19.12 and 4.20-rc7. [BZ #24022] * sysdeps/unix/sysv/linux/riscv/flush-icache.c: Check if exists with __has_include__ before including it. --- sysdeps/unix/sysv/linux/riscv/flush-icache.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/sysdeps/unix/sysv/linux/riscv/flush-icache.c b/sysdeps/unix/sysv/linux/riscv/flush-icache.c index d612ef4c6c..0b2042620b 100644 --- a/sysdeps/unix/sysv/linux/riscv/flush-icache.c +++ b/sysdeps/unix/sysv/linux/riscv/flush-icache.c @@ -21,7 +21,11 @@ #include #include #include -#include +#if __has_include () +# include +#else +# include +#endif typedef int (*func_type) (void *, void *, unsigned long int); -- 2.31.1