gnu: pulseaudio: Fix build with glibc-2.27.

* gnu/packages/patches/pulseaudio-glibc-2.27.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/pulseaudio.scm (pulseaudio)[source]: Add the patch.
[arguments]: Replace 'bootstrap' phase.
[native-inputs]: Add autoconf, automake, and libtool.

gnu/local.mk

@@ -1002,6 +1002,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/psm-ldflags.patch			\
   %D%/packages/patches/psm-repro.patch				\
   %D%/packages/patches/pt-scotch-build-parallelism.patch	\
+  %D%/packages/patches/pulseaudio-glibc-2.27.patch		\
   %D%/packages/patches/pulseaudio-fix-mult-test.patch		\
   %D%/packages/patches/pulseaudio-longer-test-timeout.patch	\
   %D%/packages/patches/pycairo-wscript.patch			\

gnu/packages/patches/pulseaudio-glibc-2.27.patch

@@ -0,0 +1,67 @@
+Copied from:
+https://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=dfb0460fb4743aec047cdf755a660a9ac2d0f3fb
+
+
+From dfb0460fb4743aec047cdf755a660a9ac2d0f3fb Mon Sep 17 00:00:00 2001
+From: Tanu Kaskinen <tanuk@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 0084c86e..0eb44b08 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -610,6 +610,9 @@ 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 3bed9b2b..c7aadfd3 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
+-- 
+2.16.2
+

gnu/packages/pulseaudio.scm

@@ -141,6 +141,7 @@ rates.")
                     (string-append "#" all "\n")))
                  #t))
              (patches (search-patches
+                       "pulseaudio-glibc-2.27.patch"
                        "pulseaudio-fix-mult-test.patch"
                        "pulseaudio-longer-test-timeout.patch"))))
     (build-system gnu-build-system)
@@ -152,6 +153,13 @@ rates.")
                                               (assoc-ref %outputs "out")
                                               "/lib/udev/rules.d"))
        #:phases (modify-phases %standard-phases
+                 (replace 'bootstrap
+                   ;; TODO: Remove this custom bootstrap phase when
+                   ;; pulseaudio-glibc-2.27.patch is removed.
+                   (lambda _
+                     (patch-shebang "git-version-gen")
+                     (setenv "NOCONFIGURE" "1")
+                     (invoke "bash" "bootstrap.sh")))
                  (add-before 'check 'pre-check
                    (lambda _
                      ;; 'tests/lock-autospawn-test.c' wants to create a file
@@ -179,7 +187,12 @@ rates.")
        ("eudev" ,eudev)           ;for the detection of hardware audio devices
        ("check" ,check)))
     (native-inputs
-     `(("pkg-config" ,pkg-config)))
+     `(("pkg-config" ,pkg-config)
+       ;; TODO: Remove "autoconf", "automake", and "libtool" from
+       ;; native-inputs when pulseaudio-glibc-2.27.patch is removed.
+       ("autoconf" ,autoconf)
+       ("automake" ,automake)
+       ("libtool" ,libtool)))
     (propagated-inputs
      ;; 'libpulse*.la' contain `-lgdbm' and `-lcap', so propagate them.
      `(("libcap" ,libcap)