Pulseaudio provides an implementation of memfd_create which conflicts with the one memfd_wrappers.h :
In file included from pulsecore/shm.c:48:0: ./pulsecore/memfd-wrappers.h:36:19: error: static declaration of 'memfd_create' follows non-static declaration static inline int memfd_create(const char *name, unsigned int flags) { ^~~~~~~~~~~~ In file included from /usr/include/bits/mman-linux.h:115:0, from /usr/include/bits/mman.h:45, from /usr/include/sys/mman.h:41, from pulsecore/shm.c:37: /usr/include/bits/mman-shared.h:46:5: note: previous declaration of 'memfd_create' was here int memfd_create (const char *__name, unsigned int __flags) __THROW; ^~~~~~~~~~~~ https://bugs.freedesktop.org/show_bug.cgi?id=104733 with patch https://bugs.freedesktop.org/attachment.cgi?id=136927 (attached) Since we claim to support older versions of LFS (and 2.27 is a very recent change) I think we'd better use the upstream patch - builds with autoreconf -fiv && intoolize -f. This was only suppsoed to be a dry run to find the bugs in my own buildscript changes. Aren't toolchain changes a pleasure. ĸen -- Truth, in front of her huge walk-in wardrobe, selected black leather boots with stiletto heels for such a barefaced truth. - Unseen Academicals
not yet Submitted By: Ken Moffat <ken at linuxfromscratch dot org> Date: 2018-02-10 Initial Package Version: 11.1 Upstream Status: Applied Origin: Upstream Description: Fixes breakage caused by glibc-2.27. >From 01239c23f57e74ec40c92144d22fe153ee65f4ff Mon Sep 17 00:00:00 2001 From: Tanu Kaskinen <ta...@iki.fi> Date: Wed, 24 Jan 2018 03:51:49 +0200 Subject: [PATCH] memfd-wrappers: only define memfd_create() if not already defined glibc 2.27 is to be released soon, and it will provide memfd_create(). If glibc provides the function, we must not define it ourselves, otherwise building fails due to conflict between the two implementations of the same function. BugLink: https://bugs.freedesktop.org/show_bug.cgi?id=104733 --- configure.ac | 3 +++ src/pulsecore/memfd-wrappers.h | 7 ++++--- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/configure.ac b/configure.ac index 013918f1a..1095ae8cb 100644 --- a/configure.ac +++ b/configure.ac @@ -607,6 +607,9 @@ AS_IF([test "x$enable_memfd" = "xyes" && test "x$HAVE_MEMFD" = "x0"], [AC_MSG_ERROR([*** Your Linux kernel does not support memfd shared memory. *** Use linux v3.17 or higher for such a feature.])]) +AS_IF([test "x$HAVE_MEMFD" = "x1"], + AC_CHECK_FUNCS([memfd_create])) + AC_SUBST(HAVE_MEMFD) AM_CONDITIONAL([HAVE_MEMFD], [test "x$HAVE_MEMFD" = x1]) AS_IF([test "x$HAVE_MEMFD" = "x1"], AC_DEFINE([HAVE_MEMFD], 1, [Have memfd shared memory.])) diff --git a/src/pulsecore/memfd-wrappers.h b/src/pulsecore/memfd-wrappers.h index 3bed9b2b1..c7aadfd3c 100644 --- a/src/pulsecore/memfd-wrappers.h +++ b/src/pulsecore/memfd-wrappers.h @@ -20,13 +20,14 @@ License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. ***/ -#ifdef HAVE_MEMFD +#if defined(HAVE_MEMFD) && !defined(HAVE_MEMFD_CREATE) #include <sys/syscall.h> #include <fcntl.h> /* - * No glibc wrappers exist for memfd_create(2), so provide our own. + * Before glibc version 2.27 there was no wrapper for memfd_create(2), + * so we have to provide our own. * * Also define memfd fcntl sealing macros. While they are already * defined in the kernel header file <linux/fcntl.h>, that file as @@ -63,6 +64,6 @@ static inline int memfd_create(const char *name, unsigned int flags) { #define F_SEAL_WRITE 0x0008 /* prevent writes */ #endif -#endif /* HAVE_MEMFD */ +#endif /* HAVE_MEMFD && !HAVE_MEMFD_CREATE */ #endif -- 2.15.1
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