Re: Strange C++ error with GCC 9.0.1

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On 27/03/19 16:54 +0100, J. Scheurich wrote:

g++ -DHAVE_CONFIG_H -DUSE_OPENSSL -DPCAPPLAY -DRTP_STREAM -DUSE_SCTP
-DHAVE_EPOLL -I. -I./include   -D__LINUX -I./include -Wall -pedantic
-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong
-grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
-c -o src/sipp-sipp.o `test -f 'src/sipp.cpp' || echo
'./'`src/sipp.cpp
In file included from ./include/strings.hpp:24,
                 from ./include/sipp.hpp:484,
                 from src/sipp.cpp:41:
/usr/include/c++/9/cstddef:52:8: error: expected unqualified-id before
string constant
   52 | extern "C++"
      |        ^~~~~
make[1]: *** [Makefile:1768: src/sipp-sipp.o] Error 1

https://en.cppreference.com/w/cpp/language/language_linkage
...
| Only two language linkages are guaranteed to be supported:
| 1) "C++", the default language linkage.
| 2) "C", which makes it possible to link with functions written in the
| C programming language, and to define, in a C++ program, functions
| that can be called from the modules written in C.

Cause  'extern "C++"' is the default for C++ and the compiler is g++,
you should be able to simply delete 'extern "C++"', is should have no
effect.

That's not true at all:

extern "C" {
extern "C++" void f();
}

extern "C++" {
void g();
}

If you remove the first occurrence of extern "C++" then you change the
language linkage of f() and if you remove the second occurrence then
you have just { at namespace scope, which is ill-formed.

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