Linux: Remove <sys/sysctl.h> and the sysctl function

Linux 5.5 remove the system call in commit
61a47c1ad3a4dc6882f01ebdc88138ac62d0df03 ("Linux: Remove
<sys/sysctl.h>").  Therefore, the compat function is just a stub that
sets ENOSYS.

Due to SHLIB_COMPAT, new ports will not add the sysctl function anymore
automatically.

x32 already lacks the sysctl function, so an empty sysctl.c file is
used to suppress it.  Otherwise, a new compat symbol would be added.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/sysctl.c b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/sysctl.c
new file mode 100644
index 0000000000..25203e4aa4
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/sysctl.c
@@ -0,0 +1,29 @@
+/* sysctl function stub.  powerpc64le version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* powerpc64le is special because it has an ABI baseline of 2.17, but
+   still includes the __sysctl symbol.  */
+
+#ifdef SHARED
+
+# include <sysdeps/unix/sysv/linux/sysctl.c>
+
+strong_alias (___sysctl, ___sysctl2)
+compat_symbol (libc, ___sysctl2, __sysctl, GLIBC_2_2);
+
+#endif