enable futexes for arm

gperftools-arm-has-futex.patch

@@ -0,0 +1,17 @@
+diff -up gperftools-2.4/src/base/spinlock_linux-inl.h.armfutex gperftools-2.4/src/base/spinlock_linux-inl.h
+--- gperftools-2.4/src/base/spinlock_linux-inl.h.armfutex	2015-06-01 15:46:32.129618825 -0400
++++ gperftools-2.4/src/base/spinlock_linux-inl.h	2015-06-01 15:46:55.081459716 -0400
+@@ -51,13 +51,8 @@ static struct InitModule {
+     int x = 0;
+     // futexes are ints, so we can use them only when
+     // that's the same size as the lockword_ in SpinLock.
+-#ifdef __arm__
+-    // ARM linux doesn't support sys_futex1(void*, int, int, struct timespec*);
+-    have_futex = 0;
+-#else
+     have_futex = (sizeof (Atomic32) == sizeof (int) &&
+                   sys_futex(&x, FUTEX_WAKE, 1, 0) >= 0);
+-#endif
+     if (have_futex &&
+         sys_futex(&x, FUTEX_WAKE | futex_private_flag, 1, 0) < 0) {
+       futex_private_flag = 0;

gperftools.spec

@@ -4,12 +4,13 @@
 
 Name:		gperftools
 Version:	2.4
-Release:	2%{?dist}
+Release:	3%{?dist}
 License:	BSD
 Group:		Development/Tools
 Summary:	Very fast malloc and performance analysis tools
 URL:		http://code.google.com/p/gperftools/
 Source0:	https://googledrive.com/host/0B6NtGsLhIcf7MWxMMF9JdTN3UVk/%{name}-%{version}.tar.gz
+Patch0:		gperftools-arm-has-futex.patch
 ExcludeArch:	s390 s390x
 %ifnarch ppc %{power64}
 BuildRequires:	libunwind-devel
@@ -56,6 +57,7 @@ Pprof is a heap and CPU profiler tool, part of the gperftools suite.
 
 %prep
 %setup -q
+%patch0 -p1 -b .armfutex
 
 # Fix end-of-line encoding
 sed -i 's/\r//' README_windows.txt
@@ -108,6 +110,9 @@ rm -rf %{buildroot}%{_pkgdocdir}/INSTALL
 %{_libdir}/*.so.*
 
 %changelog
+* Mon Jun  1 2015 Tom Callaway <spot@fedoraproject.org> - 2.4-3
+- enable futex for ARM
+
 * Sat May 02 2015 Kalev Lember <kalevlember@gmail.com> - 2.4-2
 - Rebuilt for GCC 5 C++11 ABI change