Date: Sat, 19 Oct 2019 23:51:51 +0200 From: Hauke Mehrtens <hauke@...ke-m.de> To: musl@...ts.openwall.com, Rich Felker <dalias@...c.org> Cc: catalin.marinas@....com, will@...nel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-api@...r.kernel.org, stable@...r.kernel.org Subject: Re: [PATCH] arm64: uapi: Fix user space compile with musl libc On 10/19/19 10:29 PM, Rich Felker wrote: > On Sat, Oct 19, 2019 at 10:17:17PM +0200, Hauke Mehrtens wrote: >> musl libc also defines the structures in their arch/aarch64/bits/signal.h >> header file. Some applications like strace and gdb include both of them >> and then the structure definitions are clashing and the build of these >> user space applications fails. >> >> This patch allows a libc to define a constant which tells the kernel >> header file that the libc already defined these structures and that they >> should not be defined by the kernel uapi header files any more to >> prevent clashes. This is done in a similar way as it is already done for >> other header files. >> >> When this patch was accepted into the kernel I will also update musl >> libc to define these constants. > > I don't entirely object to this outright, but I'd really like to avoid > adding further __UAPI_DEF_* suppressions. AIUI asm/sigcontext.h is not > intended to be used with userspace headers. Is it still being > indirectly included via some other uapi headers? (I thought that was > fixed..) If so, that should really be fixed first, and then we can see > if there's still motivation for the patch here. > > Rich > Hi Rich, I did some more research and it looks like this patch also fixes my problem with strace and gdb compile: https://git.kernel.org/linus/9966a05c7b80f075f2bc7e48dbb108d3f2927234 I will backport it in OpenWrt to kernel 4.19. Please drop my patch. It would be nice if it could go into the stable 4.19 kernel. Hauke
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