sys-libs/libselinux: un-break build with >=glibc-2.30

Signed-off-by: Thilo Fromm <thilo@kinvolk.io>

sdk_container/src/third_party/coreos-overlay/sys-libs/libselinux/files/0008-do-not-define-gettid-for-glibc-2.30-and-above.patch

@@ -0,0 +1,49 @@
+See https://github.com/SELinuxProject/selinux/commit/707e4b8610733b5c9eaac0f00239778f3edb23c2
+
+(original patch ported to work with Flatcar libselinux version)
+
+libselinux: Do not define gettid() if glibc >= 2.30 is used
+
+Since version 2.30 glibc implements gettid() system call wrapper, see
+https://sourceware.org/bugzilla/show_bug.cgi?id=6399
+
+Fixes:
+cc -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -I../include -D_GNU_SOURCE  -DNO_ANDROID_BACKEND   -c -o procattr.o procattr.c
+procattr.c:28:14: error: static declaration of ‘gettid’ follows non-static declaration
+   28 | static pid_t gettid(void)
+      |              ^~~~~~
+In file included from /usr/include/unistd.h:1170,
+                 from procattr.c:2:
+/usr/include/bits/unistd_ext.h:34:16: note: previous declaration of ‘gettid’ was here
+   34 | extern __pid_t gettid (void) __THROW;
+      |                ^~~~~~
+
+Signed-off-by: Petr Lautrbach <plautrba@redhat.com>
+
+--- a/src/procattr.c
++++ b/src/procattr.c
+@@ -22,10 +22,24 @@ static pthread_key_t destructor_key;
+ static int destructor_key_initialized = 0;
+ static __thread char destructor_initialized;
+ 
++/* Bionic and glibc >= 2.30 declare gettid() system call wrapper in unistd.h and
++ * has a definition for it */
++#ifdef __BIONIC__
++  #define OVERRIDE_GETTID 0
++#elif !defined(__GLIBC_PREREQ)
++  #define OVERRIDE_GETTID 1
++#elif !__GLIBC_PREREQ(2,30)
++  #define OVERRIDE_GETTID 1
++#else
++  #define OVERRIDE_GETTID 0
++#endif
++
++#if OVERRIDE_GETTID
+ static pid_t gettid(void)
+ {
+ 	return syscall(__NR_gettid);
+ }
++#endif
+ 
+ static void procattr_thread_destructor(void __attribute__((unused)) *unused)
+ {

sdk_container/src/third_party/coreos-overlay/sys-libs/libselinux/libselinux-2.4.ebuild

@@ -38,7 +38,8 @@ S="${WORKDIR}/${MY_P}"
 src_prepare() {
 	epatch "${FILESDIR}/0005-use-ruby-include-with-rubylibver.patch"
 	epatch "${FILESDIR}/0006-build-related-fixes-bug-500674.patch"
-    epatch "${FILESDIR}/0007-fix-setexeccon-on-exec.patch"
+	epatch "${FILESDIR}/0007-fix-setexeccon-on-exec.patch"
+	epatch "${FILESDIR}/0008-do-not-define-gettid-for-glibc-2.30-and-above.patch"
 
 	epatch_user