gdb: Document C++17 build requirement.

We require C++17 to build for a while now:
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=f74dc26792a0679e29db45e56367331ff48666d1

Reviewed-By: Lancelot Six <lancelot.six@amd.com>

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index e4b89cfccfcf774c62b42ee6f673348715381f66..79805486dd68ee26196606b8a83ea06cb2077f92 100644 (file)
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -40555,9 +40555,9 @@ Other packages will be used only if they are found.
 
 @heading Tools/Packages Necessary for Building @value{GDBN}
 @table @asis
-@item C@t{++}11 compiler
-@value{GDBN} is written in C@t{++}11.  It should be buildable with any
-recent C@t{++}11 compiler, e.g.@: GCC.
+@item C@t{++}17 compiler
+@value{GDBN} is written in C@t{++}17.  It should be buildable with any
+recent C@t{++}17 compiler, e.g.@: GCC.
 
 @item GNU make
 @value{GDBN}'s build system relies on features only found in the GNU