[Bug preprocessor/61389] New: libcpp diagnostics shouldn't talk about ISO C99 for C++ input files

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61389

            Bug ID: 61389
           Summary: libcpp diagnostics shouldn't talk about ISO C99 for
                    C++ input files
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org

#define V(A, ...) __VA_ARGS__
void f() {
 V(1);
}


$ g++ v.cc -pedantic -c
v.cc:1:14: warning: anonymous variadic macros were introduced in C99
[-Wvariadic-macros]
 #define V(A, ...) __VA_ARGS__
              ^
v.cc:3:5: warning: ISO C99 requires rest arguments to be used [enabled by
default]
  V(1);
     ^
v.cc:3:5: warning: invoking macro V argument 2: empty macro arguments are
undefined in ISO C90 and ISO C++98 [enabled by default]


1) The reference to C99 is not relevant for C++

2) the term "rest arguments" is not defined by any standard, or AFAICT the GCC
docs, and is confusing


Similarly:

$ g++ -pedantic -c v.cc -std=c++11
v.cc:1:13: warning: ISO C99 requires whitespace after the macro name [enabled
by default]
 #define PLUS+
             ^

This should say C++11 no C99