termios: Consolidate Baud Rate Selection definitions (BZ#23783)

This patch consolidates the termios symbolic constants used for baud rates
selection used along with speed_t on its own header.  The Linux generic
implementation values match the kernel UAPI and each architecture with
deviate values have their own implementation (in this case alpha and
powerpc).

No semantic change is expected, checked on a build against x86_64-linux-gnu,
alpha-linux-gnu, mips64-linux-gnu, and sparc64-linux-gnu.

	[BZ #23783]
	* sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add
	termios-baud.h.
	* sysdeps/unix/sysv/linux/bits/termios-baud.h: New file.
	* sysdeps/unix/sysv/linux/alpha/bits/termios-baud.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/termios-baud.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/termios-baud.h: Likewise.
	* sysdeps/unix/sysv/linux/alpha/bits/termios.h (B57600, B115200,
	B230400, B460800, B500000, B576000, B921600, B1000000, B1152000,
	B1500000, B2000000, B2500000, B3000000, B3500000, B4000000,
	__MAX_BAUD): Move to termios-baud.h.
	[__USE_MISC] (CBAUD, CBAUDEX): Likewise.
	* sysdeps/unix/sysv/linux/bits/termios.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/bits/termios.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/bits/termios.h: Likewise.
	* sysdeps/unix/sysv/linux/sparc/bits/termios.h: Likewise.

2 files changed, 46 insertions, 24 deletions

diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/termios-baud.h b/sysdeps/unix/sysv/linux/powerpc/bits/termios-baud.h
new file mode 100644
index 0000000000..fc16e6333b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/termios-baud.h
@@ -0,0 +1,45 @@
+/* termios baud rate selection definitions.  Linux/powerpc version.
+   Copyright (C) 2019 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _TERMIOS_H
+# error "Never include <bits/termios-baud.h> directly; use <termios.h> instead."
+#endif
+
+#ifdef __USE_MISC
+# define CBAUD	0000377
+# define CBAUDEX 0000020
+# define CMSPAR   010000000000		/* mark or space (stick) parity */
+# define CRTSCTS  020000000000		/* flow control */
+#endif
+
+#define  B57600   00020
+#define  B115200  00021
+#define  B230400  00022
+#define  B460800  00023
+#define  B500000  00024
+#define  B576000  00025
+#define  B921600  00026
+#define  B1000000 00027
+#define  B1152000 00030
+#define  B1500000 00031
+#define  B2000000 00032
+#define  B2500000 00033
+#define  B3000000 00034
+#define  B3500000 00035
+#define  B4000000 00036
+#define __MAX_BAUD B4000000
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/termios.h b/sysdeps/unix/sysv/linux/powerpc/bits/termios.h
index d89fad8368..e35de92529 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/termios.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/termios.h
@@ -29,9 +29,6 @@ typedef unsigned int	tcflag_t;
 #include <bits/termios-c_oflag.h>
 
 /* c_cflag bit meaning */
-#ifdef __USE_MISC
-# define CBAUD	0000377
-#endif
 #define  B0	0000000		/* hang up */
 #define  B50	0000001
 #define  B75	0000002
@@ -51,24 +48,8 @@ typedef unsigned int	tcflag_t;
 #ifdef __USE_MISC
 # define EXTA B19200
 # define EXTB B38400
-# define CBAUDEX 0000020
 #endif
-#define  B57600   00020
-#define  B115200  00021
-#define  B230400  00022
-#define  B460800  00023
-#define  B500000  00024
-#define  B576000  00025
-#define  B921600  00026
-#define  B1000000 00027
-#define  B1152000 00030
-#define  B1500000 00031
-#define  B2000000 00032
-#define  B2500000 00033
-#define  B3000000 00034
-#define  B3500000 00035
-#define  B4000000 00036
-#define __MAX_BAUD B4000000
+#include <bits/termios-baud.h>
 
 #define CSIZE	00001400
 #define   CS5	00000000
@@ -83,10 +64,6 @@ typedef unsigned int	tcflag_t;
 #define HUPCL	00040000
 
 #define CLOCAL	00100000
-#ifdef __USE_MISC
-# define CMSPAR   010000000000		/* mark or space (stick) parity */
-# define CRTSCTS  020000000000		/* flow control */
-#endif
 
 /* c_lflag bits */
 #define ISIG	0x00000080