Building on recent OpenBSD fails because the mask macros have been
redefined.  Use the new macros if available.

libstdc++-v3/ChangeLog:

        * config/os/bsd/openbsd/ctype_base.h:

Signed-off-by: Pietro Monteiro <[email protected]>
---
 libstdc++-v3/config/os/bsd/openbsd/ctype_base.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/libstdc++-v3/config/os/bsd/openbsd/ctype_base.h 
b/libstdc++-v3/config/os/bsd/openbsd/ctype_base.h
index c86c77e60fc..e1d982f81cd 100644
--- a/libstdc++-v3/config/os/bsd/openbsd/ctype_base.h
+++ b/libstdc++-v3/config/os/bsd/openbsd/ctype_base.h
@@ -42,6 +42,21 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     // on the mask type. Because of this, we don't use an enum.
     typedef char               mask;
 
+#ifdef _CTYPE_S
+    // OpenBSD 7.5 uses this style of define.
+    static const mask upper    = _CTYPE_U;
+    static const mask lower    = _CTYPE_L;
+    static const mask alpha    = _CTYPE_U | _CTYPE_L;
+    static const mask digit    = _CTYPE_N;
+    static const mask xdigit   = _CTYPE_N | _CTYPE_X;
+    static const mask space    = _CTYPE_S;
+    static const mask print    = _CTYPE_P | _CTYPE_U | _CTYPE_L | _CTYPE_N | 
_CTYPE_B;
+    static const mask graph    = _CTYPE_P | _CTYPE_U | _CTYPE_L | _CTYPE_N;
+    static const mask cntrl    = _CTYPE_C;
+    static const mask punct    = _CTYPE_P;
+    static const mask alnum    = _CTYPE_U | _CTYPE_L | _CTYPE_N;
+#else
+    // Older versions use this style.
     static const mask upper    = _U;
     static const mask lower    = _L;
     static const mask alpha    = _U | _L;
@@ -53,6 +68,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     static const mask cntrl    = _C;
     static const mask punct    = _P;
     static const mask alnum    = _U | _L | _N;
+#endif
 #if __cplusplus >= 201103L
     static const mask blank    = space;
 #endif
-- 
2.54.0

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