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, 48 insertions, 28 deletions

diff --git a/sysdeps/unix/sysv/linux/sparc/bits/termios-baud.h b/sysdeps/unix/sysv/linux/sparc/bits/termios-baud.h
new file mode 100644
index 0000000000..3803e124dd
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/sparc/bits/termios-baud.h
@@ -0,0 +1,46 @@
+/* termios baud rate selection definitions.  Linux/sparc 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   0x0000100f
+# define CBAUDEX 0x00001000
+# define CIBAUD	 0x100f0000	/* input baud rate (not used) */
+# define CMSPAR  0x40000000	/* mark or space (stick) parity */
+# define CRTSCTS 0x80000000	/* flow control */
+#endif
+
+#define  B57600  0x00001001
+#define  B115200 0x00001002
+#define  B230400 0x00001003
+#define  B460800 0x00001004
+#define  B76800  0x00001005
+#define  B153600 0x00001006
+#define  B307200 0x00001007
+#define  B614400 0x00001008
+#define  B921600 0x00001009
+#define  B500000 0x0000100a
+#define  B576000 0x0000100b
+#define B1000000 0x0000100c
+#define B1152000 0x0000100d
+#define B1500000 0x0000100e
+#define B2000000 0x0000100f
+#define __MAX_BAUD B2000000
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/termios.h b/sysdeps/unix/sysv/linux/sparc/bits/termios.h
index df278b6571..38128e7c6a 100644
--- a/sysdeps/unix/sysv/linux/sparc/bits/termios.h
+++ b/sysdeps/unix/sysv/linux/sparc/bits/termios.h
@@ -30,9 +30,6 @@ typedef unsigned int tcflag_t;
 #include <bits/termios-c_oflag.h>
 
 /* c_cflag bit meaning */
-#ifdef __USE_MISC
-# define CBAUD	0x0000100f
-#endif
 #define  B0	0x00000000	/* hang up */
 #define  B50	0x00000001
 #define  B75	0x00000002
@@ -53,6 +50,8 @@ typedef unsigned int tcflag_t;
 # define EXTA    B19200
 # define EXTB    B38400
 #endif
+#include <bits/termios-baud.h>
+
 #define  CSIZE  0x00000030
 #define   CS5	0x00000000
 #define   CS6	0x00000010
@@ -64,31 +63,6 @@ typedef unsigned int tcflag_t;
 #define PARODD	0x00000200
 #define HUPCL	0x00000400
 #define CLOCAL	0x00000800
-#ifdef __USE_MISC
-# define CBAUDEX 0x00001000
-#endif
-#define  B57600  0x00001001
-#define  B115200 0x00001002
-#define  B230400 0x00001003
-#define  B460800 0x00001004
-#define  B76800  0x00001005
-#define  B153600 0x00001006
-#define  B307200 0x00001007
-#define  B614400 0x00001008
-#define  B921600 0x00001009
-#define  B500000 0x0000100a
-#define  B576000 0x0000100b
-#define B1000000 0x0000100c
-#define B1152000 0x0000100d
-#define B1500000 0x0000100e
-#define B2000000 0x0000100f
-#define __MAX_BAUD B2000000
-
-#ifdef __USE_MISC
-# define CIBAUD	 0x100f0000	/* input baud rate (not used) */
-# define CMSPAR	 0x40000000	/* mark or space (stick) parity */
-# define CRTSCTS 0x80000000	/* flow control */
-#endif
 
 /* c_lflag bits */
 #define ISIG	0x00000001