soft-fp: Use multiple-include guards.

This patch makes soft-fp headers consistently use multiple-include
guards, something previously done mainly only in the Linux kernel
version.  The guard macros aren't the same as those used in the Linux
kernel, but there seems to be enough variation in such guards in Linux
kernel code that hopefully this version will be acceptable there.

Tested for powerpc-nofpu that installed stripped shared libraries are
unchanged by this patch.

	* soft-fp/double.h [SOFT_FP_DOUBLE_H]: New multiple-include guard.
	* soft-fp/extended.h [SOFT_FP_EXTENDED_H]: Likewise.
	* soft-fp/op-1.h [SOFT_FP_OP_1_H]: Likewise.
	* soft-fp/op-2.h [SOFT_FP_OP_2_H]: Likewise.
	* soft-fp/op-4.h [SOFT_FP_OP_4_H]: Likewise.
	* soft-fp/op-8.h [SOFT_FP_OP_8_H]: Likewise.
	* soft-fp/op-common.h [SOFT_FP_OP_COMMON_H]: Likewise.
	* soft-fp/quad.h [SOFT_FP_QUAD_H]: Likewise.
	* soft-fp/single.h [SOFT_FP_SINGLE_H]: Likewise.
	* soft-fp/soft-fp.h (SOFT_FP_H): Define to 1 rather than empty.
	Add comment on closing #endif.

11 files changed, 61 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index b6467fd..0298c1d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2015-03-10  Joseph Myers  <joseph@codesourcery.com>
+
+	* soft-fp/double.h [SOFT_FP_DOUBLE_H]: New multiple-include guard.
+	* soft-fp/extended.h [SOFT_FP_EXTENDED_H]: Likewise.
+	* soft-fp/op-1.h [SOFT_FP_OP_1_H]: Likewise.
+	* soft-fp/op-2.h [SOFT_FP_OP_2_H]: Likewise.
+	* soft-fp/op-4.h [SOFT_FP_OP_4_H]: Likewise.
+	* soft-fp/op-8.h [SOFT_FP_OP_8_H]: Likewise.
+	* soft-fp/op-common.h [SOFT_FP_OP_COMMON_H]: Likewise.
+	* soft-fp/quad.h [SOFT_FP_QUAD_H]: Likewise.
+	* soft-fp/single.h [SOFT_FP_SINGLE_H]: Likewise.
+	* soft-fp/soft-fp.h (SOFT_FP_H): Define to 1 rather than empty.
+	Add comment on closing #endif.
+
 2015-03-09  Paul Pluzhnikov  <ppluzhnikov@google.com>
 
 	* posix/wordexp.c (CHAR_IN_SET): New macro.
diff --git a/soft-fp/double.h b/soft-fp/double.h
index b45827b..a05713f 100644
--- a/soft-fp/double.h
+++ b/soft-fp/double.h
@@ -30,6 +30,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef SOFT_FP_DOUBLE_H
+#define SOFT_FP_DOUBLE_H	1
+
 #if _FP_W_TYPE_SIZE < 32
 # error "Here's a nickel kid.  Go buy yourself a real computer."
 #endif
@@ -316,3 +319,5 @@ union _FP_UNION_D
 # define _FP_FRAC_HIGH_DW_D(X)	_FP_FRAC_HIGH_2 (X)
 
 #endif /* W_TYPE_SIZE < 64 */
+
+#endif /* !SOFT_FP_DOUBLE_H */
diff --git a/soft-fp/extended.h b/soft-fp/extended.h
index a96d63e..428f917 100644
--- a/soft-fp/extended.h
+++ b/soft-fp/extended.h
@@ -27,6 +27,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef SOFT_FP_EXTENDED_H
+#define SOFT_FP_EXTENDED_H	1
+
 #if _FP_W_TYPE_SIZE < 32
 # error "Here's a nickel, kid. Go buy yourself a real computer."
 #endif
@@ -506,3 +509,5 @@ union _FP_UNION_E
 # define _FP_FRAC_HIGH_DW_E(X)	(X##_f[2])
 
 #endif /* not _FP_W_TYPE_SIZE < 64 */
+
+#endif /* !SOFT_FP_EXTENDED_H */
diff --git a/soft-fp/op-1.h b/soft-fp/op-1.h
index bc9e33b..e3a91bf 100644
--- a/soft-fp/op-1.h
+++ b/soft-fp/op-1.h
@@ -30,6 +30,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef SOFT_FP_OP_1_H
+#define SOFT_FP_OP_1_H	1
+
 #define _FP_FRAC_DECL_1(X)	_FP_W_TYPE X##_f _FP_ZERO_INIT
 #define _FP_FRAC_COPY_1(D, S)	(D##_f = S##_f)
 #define _FP_FRAC_SET_1(X, I)	(X##_f = I)
@@ -362,3 +365,5 @@
 /* Convert FP values between word sizes.  */
 
 #define _FP_FRAC_COPY_1_1(D, S)		(D##_f = S##_f)
+
+#endif /* !SOFT_FP_OP_1_H */
diff --git a/soft-fp/op-2.h b/soft-fp/op-2.h
index 26bdfc0..c27b890 100644
--- a/soft-fp/op-2.h
+++ b/soft-fp/op-2.h
@@ -30,6 +30,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef SOFT_FP_OP_2_H
+#define SOFT_FP_OP_2_H	1
+
 #define _FP_FRAC_DECL_2(X)				\
   _FP_W_TYPE X##_f0 _FP_ZERO_INIT, X##_f1 _FP_ZERO_INIT
 #define _FP_FRAC_COPY_2(D, S)	(D##_f0 = S##_f0, D##_f1 = S##_f1)
@@ -698,3 +701,5 @@
 #define _FP_FRAC_COPY_2_1(D, S)		((D##_f0 = S##_f), (D##_f1 = 0))
 
 #define _FP_FRAC_COPY_2_2(D, S)		_FP_FRAC_COPY_2 (D, S)
+
+#endif /* !SOFT_FP_OP_2_H */
diff --git a/soft-fp/op-4.h b/soft-fp/op-4.h
index eeb41e0..a580517 100644
--- a/soft-fp/op-4.h
+++ b/soft-fp/op-4.h
@@ -30,6 +30,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef SOFT_FP_OP_4_H
+#define SOFT_FP_OP_4_H	1
+
 #define _FP_FRAC_DECL_4(X)	_FP_W_TYPE X##_f[4]
 #define _FP_FRAC_COPY_4(D, S)			\
   (D##_f[0] = S##_f[0], D##_f[1] = S##_f[1],	\
@@ -868,3 +871,5 @@
   while (0)
 
 #define _FP_FRAC_COPY_4_4(D, S)	_FP_FRAC_COPY_4 (D, S)
+
+#endif /* !SOFT_FP_OP_4_H */
diff --git a/soft-fp/op-8.h b/soft-fp/op-8.h
index b072ab0..5267ae3 100644
--- a/soft-fp/op-8.h
+++ b/soft-fp/op-8.h
@@ -29,6 +29,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef SOFT_FP_OP_8_H
+#define SOFT_FP_OP_8_H	1
+
 /* We need just a few things from here for op-4, if we ever need some
    other macros, they can be added.  */
 #define _FP_FRAC_DECL_8(X)	_FP_W_TYPE X##_f[8]
@@ -143,3 +146,5 @@
       X##_f[0] |= (_FP_FRAC_SRS_8_s != 0);				\
     }									\
   while (0)
+
+#endif /* !SOFT_FP_OP_8_H */
diff --git a/soft-fp/op-common.h b/soft-fp/op-common.h
index ee41476..0a2f86a 100644
--- a/soft-fp/op-common.h
+++ b/soft-fp/op-common.h
@@ -29,6 +29,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef SOFT_FP_OP_COMMON_H
+#define SOFT_FP_OP_COMMON_H	1
+
 #define _FP_DECL(wc, X)						\
   _FP_I_TYPE X##_c __attribute__ ((unused)) _FP_ZERO_INIT;	\
   _FP_I_TYPE X##_s __attribute__ ((unused)) _FP_ZERO_INIT;	\
@@ -2109,3 +2112,5 @@
 #define _FP_DIV_MEAT_1_loop(fs, R, X, Y)  _FP_DIV_MEAT_N_loop (fs, 1, R, X, Y)
 #define _FP_DIV_MEAT_2_loop(fs, R, X, Y)  _FP_DIV_MEAT_N_loop (fs, 2, R, X, Y)
 #define _FP_DIV_MEAT_4_loop(fs, R, X, Y)  _FP_DIV_MEAT_N_loop (fs, 4, R, X, Y)
+
+#endif /* !SOFT_FP_OP_COMMON_H */
diff --git a/soft-fp/quad.h b/soft-fp/quad.h
index 78387fc..9b5191c 100644
--- a/soft-fp/quad.h
+++ b/soft-fp/quad.h
@@ -30,6 +30,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef SOFT_FP_QUAD_H
+#define SOFT_FP_QUAD_H	1
+
 #if _FP_W_TYPE_SIZE < 32
 # error "Here's a nickel, kid. Go buy yourself a real computer."
 #endif
@@ -323,3 +326,5 @@ union _FP_UNION_Q
 # define _FP_FRAC_HIGH_DW_Q(X)	_FP_FRAC_HIGH_4 (X)
 
 #endif /* not _FP_W_TYPE_SIZE < 64 */
+
+#endif /* !SOFT_FP_QUAD_H */
diff --git a/soft-fp/single.h b/soft-fp/single.h
index 849bca5..b035140 100644
--- a/soft-fp/single.h
+++ b/soft-fp/single.h
@@ -30,6 +30,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#ifndef SOFT_FP_SINGLE_H
+#define SOFT_FP_SINGLE_H	1
+
 #if _FP_W_TYPE_SIZE < 32
 # error "Here's a nickel kid.  Go buy yourself a real computer."
 #endif
@@ -192,3 +195,5 @@ union _FP_UNION_S
 #else
 # define _FP_FRAC_HIGH_DW_S(X)	_FP_FRAC_HIGH_1 (X)
 #endif
+
+#endif /* !SOFT_FP_SINGLE_H */
diff --git a/soft-fp/soft-fp.h b/soft-fp/soft-fp.h
index f93a941..bb68df9 100644
--- a/soft-fp/soft-fp.h
+++ b/soft-fp/soft-fp.h
@@ -30,7 +30,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #ifndef SOFT_FP_H
-#define SOFT_FP_H
+#define SOFT_FP_H	1
 
 #ifdef _LIBC
 # include <sfp-machine.h>
@@ -337,4 +337,4 @@ typedef USItype UHWtype;
 extern void abort (void);
 #endif
 
-#endif
+#endif /* !SOFT_FP_H */