Yes, that seems to be it. The compiler also prints:
/usr/include/sys/types.h:27:1: note: ‘extern "C"’ linkage started here
27 | __BEGIN_DECLS
| ^~~~~~~~~~~~~
Those are system includes - not sure why it's suddenly a problem.
Also causing trouble is that ToHost and FromHost are each defined twice in
endian.h, in two different namespaces, little_endian and big_endian. No
idea why that's a problem.
Anyway thanks for your insights!
Michelle
On Friday, March 14, 2025 at 2:13:02 PM UTC-7 Adam Cozzette wrote:
> Those errors make it seem like you're somehow including a bunch of C++
> headers inside an extern "C" {} block, though I'm not sure why that would
> happen. One thing to watch out for is that it's important to regenerate
> your pb.h and pb.cc files with the new protoc if you have not already done
> so.
>
> On Fri, Mar 14, 2025 at 1:52 PM Michelle Eshow <[email protected]>
> wrote:
>
>> We are upgrading PB from 3.14 to 30.0, on Alma Linux 9, with g++ 11.5.0.
>> We are using it in C++ as well as Java code.
>>
>> protoc, shared libs, and include files all show the right release --
>> 30.0.
>>
>> The new installs are in /usr/local/... where the old version is in /usr/
>> directly
>>
>> When I try to compile our message library using gnu make, we are getting
>> errors around use of Templates in C code and conflicting definitions of PB
>> functions. Does this seem familiar to anyone? Below are detailed examples.
>> We would appreciate any help at all!
>>
>> Michelle
>>
>> In file included from /usr/include/c++/11/utility:76,
>> from /usr/local/include/absl/base/optimization.h:37,
>> from /usr/local/include/absl/base/macros.h:36,
>> from /usr/local/include/google/protobuf/port_def.inc:35,
>> from /usr/local/include/google/protobuf/endian.h:20,
>> from /usr/include/sys/types.h:176,
>> from /usr/include/stdlib.h:394,
>> from /usr/include/c++/11/cstdlib:75,
>> from /usr/include/c++/11/bits/stl_algo.h:59,
>> from /usr/include/c++/11/string:52,
>> from AcLandProtobuf.pb.h:10,
>> from AcLandProtobuf.pb.cc:6:
>> /usr/include/c++/11/initializer_list:99:3: error: template with C linkage
>> 99 | template<class _Tp>
>> | ^~~~~~~~
>>
>> /usr/local/include/google/protobuf/endian.h:161:17: error: conflicting
>> declaration of C function ‘uint64_t
>> google::protobuf::internal::big_endian::ToHost(uint64_t)’
>> 161 | inline uint64_t ToHost(uint64_t value) {
>> | ^~~~~~
>> /usr/local/include/google/protobuf/endian.h:145:17: note: previous
>> declaration ‘uint16_t
>> google::protobuf::internal::big_endian::ToHost(uint16_t)’
>> 145 | inline uint16_t ToHost(uint16_t value) {
>>
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