v21.0 does not install all the required headers

[coryan]

What version of protobuf and what language are you using?

Version: v21.0
Language: C++

What operating system (Linux, Windows, ...) and version?

Linux, but I assume it affects all operating systems

What runtime / compiler are you using (e.g., python version or gcc version)

 gcc --version
gcc (Ubuntu 11.2.0-19ubuntu1) 11.2.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

What did you do?

Compiled and installed Protobuf using CMake. To workaround #10045 I used the CMake FindProtobuf module.

What did you expect to see

I would expect a simple program that includes google/protobuf/message.h to compile.

What did you see instead?

The program does not compile with this error:

18 0.913 /usr/bin/c++    -MD -MT CMakeFiles/main.dir/test.cc.o -MF CMakeFiles/main.dir/test.cc.o.d -o CMakeFiles/main.dir/test.cc.o -c /var/tmp/build/test/test.cc
#18 0.913 In file included from /usr/local/include/google/protobuf/unknown_field_set.h:53,
#18 0.913                  from /usr/local/include/google/protobuf/generated_message_reflection.h:47,
#18 0.913                  from /usr/local/include/google/protobuf/message.h:124,
#18 0.913                  from /var/tmp/build/test/test.cc:1:
#18 0.913 /usr/local/include/google/protobuf/parse_context.h:45:10: fatal error: google/protobuf/endian.h: No such file or directory
#18 0.913    45 | #include <google/protobuf/endian.h>
#18 0.913       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~
#18 0.913 compilation terminated.

Anything else we should know about your project / environment

You can use Dockerfile-2.txt to repro the problem, just run:

docker buildx build --progress plain -t test - <Dockerfile-2.txt

[acozzette]

@coryan Thanks for the bug report! #10057 fixes this and the fix will be released in 21.1.