[gdb/build] Fix build breaker in language.c with gcc 7.5.0

When building gdb on openSUSE Leap 15.3, using gcc 7.5.0, I run into:
...
gdb/language.c: In constructor ‘constexpr language_gdbarch::language_gdbarch()’:
gdb/language.c:921:8: error: use of deleted function \
  ‘language_arch_info::language_arch_info(const language_arch_info&)’
 struct language_gdbarch
        ^~~~~~~~~~~~~~~~
In file included from gdbsupport/common-defs.h:104:0,
                 from gdb/defs.h:28,
                 from gdb/language.c:31:
gdb/language.h:95:28: note: declared here
   DISABLE_COPY_AND_ASSIGN (language_arch_info);
                            ^
include/ansidecl.h:342:3: note: in definition of macro \
  ‘DISABLE_COPY_AND_ASSIGN’
   TYPE (const TYPE&) = delete;   \
   ^~~~
gdb/language.c: In function ‘language_gdbarch* get_language_gdbarch(gdbarch*)’:
gdb/language.c:936:22: note: synthesized method ‘constexpr \
  language_gdbarch::language_gdbarch()’ first required here
       l = new struct language_gdbarch;
                      ^~~~~~~~~~~~~~~~
...

This seems to be fixed by this change in the struct language_gdbarch
definition:
...
-  struct language_arch_info arch_info[nr_languages] {};
+  struct language_arch_info arch_info[nr_languages];
...

Tested on x86_64-linux.

diff --git a/gdb/language.c b/gdb/language.c
index c185a009a724ded0ba72af5c463c6e34ae2de066..bc784a8ec799c5114a2c6810bb622ca157fa386e 100644 (file)
--- a/gdb/language.c
+++ b/gdb/language.c
@@ -922,7 +922,7 @@ struct language_gdbarch
 {
   /* A vector of per-language per-architecture info.  Indexed by "enum
      language".  */
-  struct language_arch_info arch_info[nr_languages] {};
+  struct language_arch_info arch_info[nr_languages];
 };
 
 static const registry<gdbarch>::key<language_gdbarch> language_gdbarch_data;