Package init

0049-iw-fix-cmd_size-determination-with-LTO.patch

@@ -0,0 +1,58 @@
+From ae03bc6effdffe145c871d70ce346f93faefc71b Mon Sep 17 00:00:00 2001
+From: Johannes Berg <johannes.berg@intel.com>
+Date: Thu, 28 Feb 2019 21:34:03 +0100
+Subject: [PATCH 49/50] iw: fix cmd_size determination with LTO
+
+Use a separate section to determine the cmd_size as in LTO
+the entries in __cmd get freely rearranged, leading to a
+(usually) very large cmd_size, and thus to the whole thing
+not working.
+
+Change-Id: I3437ad34de1d927961a3e98f109794d7a884327f
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+---
+ iw.c | 21 ++++++++++++++++++++-
+ 1 file changed, 20 insertions(+), 1 deletion(-)
+
+diff --git a/iw.c b/iw.c
+index 76f152d..afc8118 100644
+--- a/iw.c
++++ b/iw.c
+@@ -542,6 +542,25 @@ int handle_cmd(struct nl80211_state *state, enum id_input idby,
+ 	return __handle_cmd(state, idby, argc, argv, NULL);
+ }
+ 
++/*
++ * Unfortunately, I don't know how densely the linker packs the struct cmd.
++ * For example, if you have a 72-byte struct cmd, the linker will pad each
++ * out to 96 bytes before putting them together in the section. There must
++ * be some algorithm, but I haven't found it yet.
++ *
++ * We used to calculate this by taking the (abs value of) the difference
++ * between __section_get and __section_set, but if LTO is enabled then this
++ * stops working because the entries of the "__cmd" section get rearranged
++ * freely by the compiler/linker.
++ *
++ * Fix this by using yet another "__sizer" section that only contains these
++ * two entries - then the (abs value of) the difference between them will
++ * be how they get packed and that can be used to iterate the __cmd section
++ * as well.
++ */
++static struct cmd sizer1 __attribute__((used,section("__sizer"))) = {};
++static struct cmd sizer2 __attribute__((used,section("__sizer"))) = {};
++
+ int main(int argc, char **argv)
+ {
+ 	struct nl80211_state nlstate;
+@@ -549,7 +568,7 @@ int main(int argc, char **argv)
+ 	const struct cmd *cmd = NULL;
+ 
+ 	/* calculate command size including padding */
+-	cmd_size = labs((long)&__section_set - (long)&__section_get);
++	cmd_size = labs((uintptr_t)&sizer2 - (uintptr_t)&sizer1);
+ 	/* strip off self */
+ 	argc--;
+ 	argv0 = *argv++;
+-- 
+1.8.3.1
+

iw.spec

@@ -0,0 +1,43 @@
+Name:           iw
+Version:        5.0.1
+Release:        1
+Summary:        A nl80211 based wireless configuration tool
+
+License:        ISC
+URL:            https://wireless.kernel.org/en/users/Documentation/%{name}
+Source0:        https://www.kernel.org/pub/software/network/%{name}/%{name}-%{version}.tar.gz
+
+Patch6000:      0049-iw-fix-cmd_size-determination-with-LTO.patch
+
+BuildRequires:  gcc kernel-headers libnl3-devel pkgconfig
+
+%description
+iw is a new nl80211 based CLI configuration utility for wireless devices.
+It supports all new drivers that have been added to the kernel recently.
+The old tool iwconfig, which uses Wireless Extensions interface,
+is deprecated and it's strongly recommended to switch to iw and nl80211.
+
+%package_help
+
+%prep
+%autosetup -n %{name}-%{version} -p1
+
+%build
+export CFLAGS="$RPM_OPT_FLAGS" LDFLAGS="$RPM_LD_FLAGS"
+%make_build
+
+%install
+%make_install MANDIR=%{_mandir}
+
+%files
+%defattr(-,root,root)
+%license COPYING
+%{_sbindir}/%{name}
+
+%files help
+%defattr(-,root,root)
+%{_mandir}/man8/iw.*
+
+%changelog
+* Mon Sep 02 2019 openEuler Buildteam <buildteam@openeuler.org> - 5.0.1-1
+- Package init