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libselinux: Fix ARM build failure

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Avoid this warning (which is in turn an error via -Werror):
````
avc_internal.c: In function 'avc_netlink_receive':
avc_internal.c:105:25: error: cast increases required alignment of target type [-Werror=cast-align]
 struct nlmsghdr *nlh = (struct nlmsghdr *)buf;
                        ^
````

The code allocates abuffer with "__attribute__ ((aligned))",
then passes it via a 'char*' parameter, which is then finally cast,
causing the warning. So the code is ok but compiler is not smart
enough to see it.

It seems that -Wcast-align is a no-op on x86, so this shows up on ARM
only.
This commit is contained in:
Tuomas Tynkkynen 2016-10-18 23:41:50 +03:00
parent 0240306d01
commit ba42683e9a
1 changed files with 7 additions and 1 deletions
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8
pkgs/os-specific/linux/libselinux/default.nix
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@ -19,7 +19,13 @@ stdenv.mkDerivation rec {
buildInputs = [ pkgconfig libsepol pcre ]
++ optionals enablePython [ swig python ];
NIX_CFLAGS_COMPILE = "-fstack-protector-all -std=gnu89";
# Avoid this false warning:
# avc_internal.c: In function 'avc_netlink_receive':
# avc_internal.c:105:25: error: cast increases required alignment of target type [-Werror=cast-align]
# struct nlmsghdr *nlh = (struct nlmsghdr *)buf;
# ^
NIX_CFLAGS_COMPILE = "-std=gnu89 -Wno-error=cast-align";
# Unreleased upstream patch that fixes Python package issue arising
# from recent SWIG changes.