[Buildroot] [git commit] boost: fix build on ARC
From: Peter Korsgaard <peter@korsgaard.com>
Date: 2015-08-19 21:06:59
Subsystem:
the rest · Maintainer:
Linus Torvalds
commit: http://git.buildroot.net/buildroot/commit/?id=b7aee38fe2d6409caa2b12d2b6a1e6acdf19014f branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master This commit adds a patch to Boost to make it use the eventfd() function provided by the C library when uClibc is used, rather than falling back to using directly the __NR_eventfd system call. This fixes the build on ARC, which doesn't define __NR_eventfd. The original problem is that uClibc pretends to be glibc 2.2, which didn't had eventfd(), so Boost makes the system call manually. uClibc-ng, in its next release, will pretend to be glibc 2.10 (see http://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng.git/commit/?id=4ff3a6c8eb91db71d6dc3d2932b66e848bd20ac3), which will also fix the problem, but requires bumping the uClibc version, rebuilding the external toolchains, and so on. Ideally, Boost should be doing a compile test to detect if eventfd() is available or not, but the Boost build system is so brain-damaged that doing so would require way too much effort. Fixes: http://autobuild.buildroot.org/results/22b/22b710346d2cd78b7b51cdccd18d670bb6ac5d24/ and many similar build failures [Peter: minor tweaks to description] Signed-off-by: Thomas Petazzoni <redacted> Signed-off-by: Peter Korsgaard <peter@korsgaard.com> --- package/boost/0004-fix-uclibc-eventfd.patch | 38 +++++++++++++++++++++++++++ 1 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/package/boost/0004-fix-uclibc-eventfd.patch b/package/boost/0004-fix-uclibc-eventfd.patch
new file mode 100644
index 0000000..1b7eb87
--- /dev/null
+++ b/package/boost/0004-fix-uclibc-eventfd.patch@@ -0,0 +1,38 @@ +Use eventfd() function with uClibc + +The Boost eventfd code either directly makes the eventfd system call +using __NR_eventfd (when __GLIBC_MINOR is less than 8), or otherwise +uses the eventfd() function provided by the C library. + +However, since uClibc pretends to be glibc 2.2, the Boost eventfd code +directly uses the system call. While it works fine on most +architectures, it doesn't on ARC since __NR_eventfd is not defined on +this architecture. However, eventfd() is properly implemented. + +So, this patch adjusts the logic used by Boost to consider uClibc as a +C library providing the eventfd() function. + +Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> + +Index: b/boost/asio/detail/impl/eventfd_select_interrupter.ipp +=================================================================== +--- a/boost/asio/detail/impl/eventfd_select_interrupter.ipp ++++ b/boost/asio/detail/impl/eventfd_select_interrupter.ipp +@@ -23,7 +23,7 @@ + #include <sys/stat.h> + #include <sys/types.h> + #include <fcntl.h> +-#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8 ++#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8 && !defined(__UCLIBC__) + # include <asm/unistd.h> + #else // __GLIBC__ == 2 && __GLIBC_MINOR__ < 8 + # include <sys/eventfd.h> +@@ -46,7 +46,7 @@ + + void eventfd_select_interrupter::open_descriptors() + { +-#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8 ++#if __GLIBC__ == 2 && __GLIBC_MINOR__ < 8 && !defined(__UCLIBC__) + write_descriptor_ = read_descriptor_ = syscall(__NR_eventfd, 0); + if (read_descriptor_ != -1) + {