signal: Move sys_errlist to a compat symbol

The symbol is deprecated by strerror since its usage imposes some issues
such as copy relocations.

Its internal name is also changed to _sys_errlist_internal to avoid
static linking usage.  The compat code is also refactored by removing
the over enginered errlist-compat.c generation from manual entried and
extra comment token in linker script file.  It disantangle the code
generation from manual and simplify both Linux and Hurd compat code.

The definitions from errlist.c are moved to errlist.h and a new test
is added to avoid a new errno entry without an associated one in manual.

Checked on x86_64-linux-gnu and i686-linux-gnu. I also run a check-abi
on all affected platforms.

Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

2 files changed, 43 insertions, 12 deletions

diff --git a/sysdeps/unix/sysv/linux/alpha/Versions b/sysdeps/unix/sysv/linux/alpha/Versions
index 3b7971c2a3..b90d5f2e5a 100644
--- a/sysdeps/unix/sysv/linux/alpha/Versions
+++ b/sysdeps/unix/sysv/linux/alpha/Versions
@@ -1,12 +1,5 @@
 libc {
-  # The comment lines with "#errlist-compat" are magic; see
-  # sysdeps/gnu/errlist-compat.awk.
-  # When you get an error from errlist-compat.awk, you need to add a new
-  # version here.  Don't do this blindly, since this means changing the ABI
-  # for all GNU/Linux configurations.
-
   GLIBC_2.0 {
-    #errlist-compat	131
     _sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
 
     # Unfortunately in wider use.
@@ -33,7 +26,6 @@ libc {
     pciconfig_read; pciconfig_write; sethae;
   }
   GLIBC_2.1 {
-    #errlist-compat	131
     _sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
 
     # Linux/Alpha 64-bit timeval functions.
@@ -70,19 +62,15 @@ libc {
     wordexp;
   }
   GLIBC_2.3 {
-    #errlist-compat	132
     _sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
   }
   GLIBC_2.4 {
-    #errlist-compat	138
     _sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
   }
   GLIBC_2.12 {
-    #errlist-compat	139
     _sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
   }
   GLIBC_2.16 {
-    #errlist-compat	140
     _sys_errlist; sys_errlist; _sys_nerr; sys_nerr;
   }
   GLIBC_2.27 {
diff --git a/sysdeps/unix/sysv/linux/alpha/errlist-compat.c b/sysdeps/unix/sysv/linux/alpha/errlist-compat.c
new file mode 100644
index 0000000000..709807aa6b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/errlist-compat.c
@@ -0,0 +1,43 @@
+/* Linux sys_errlist compat symbol definitions.  Alpha 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/>.  */
+
+#include <errlist-compat.h>
+
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
+DEFINE_COMPAT_ERRLIST (131, GLIBC_2_0)
+#endif
+
+#if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_3)
+DEFINE_COMPAT_ERRLIST (131, GLIBC_2_1)
+#endif
+
+#if SHLIB_COMPAT (libc, GLIBC_2_3, GLIBC_2_4)
+DEFINE_COMPAT_ERRLIST (132, GLIBC_2_3)
+#endif
+
+#if SHLIB_COMPAT (libc, GLIBC_2_4, GLIBC_2_12)
+DEFINE_COMPAT_ERRLIST (138, GLIBC_2_4)
+#endif
+
+#if SHLIB_COMPAT (libc, GLIBC_2_12, GLIBC_2_16)
+DEFINE_COMPAT_ERRLIST (139, GLIBC_2_12)
+#endif
+
+#if SHLIB_COMPAT (libc, GLIBC_2_16, GLIBC_2_32)
+DEFINE_COMPAT_ERRLIST (140, GLIBC_2_16)
+#endif