dev-libs/protobuf-c: doesn't compile with lto

[Szpadel]

Build error:
It looks like it isn't passing some runtime checks after build

/usr/bin/protoc --plugin=protoc-gen-c=./protoc-c/protoc-gen-c -I/var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1 --c_out=. /var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1/t/test-proto3.proto                                                  
/usr/bin/protoc --plugin=protoc-gen-c=./protoc-c/protoc-gen-c -I/var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1 --c_out=. /var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1/t/issue220/issue220.proto                                            
/usr/bin/protoc --plugin=protoc-gen-c=./protoc-c/protoc-gen-c -I/var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1 --c_out=. /var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1/t/issue220/issue220.proto                                            
terminate called after throwing an instance of 'std::system_error'                                                                                                                                                                                                               
  what():  Unknown error -1                                                                                                                                                                                                                                                      
/usr/bin/protoc --plugin=protoc-gen-c=./protoc-c/protoc-gen-c -I/var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1 --c_out=. /var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1/t/issue251/issue251.proto                                            
/usr/bin/protoc --plugin=protoc-gen-c=./protoc-c/protoc-gen-c -I/var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1 --c_out=. /var/tmp/portage/dev-libs/protobuf-c-1.3.1/work/protobuf-c-1.3.1/t/issue251/issue251.proto                                            
[libprotobuf WARNING ../../protobuf-3.7.1/src/google/protobuf/compiler/parser.cc:564] No syntax specified for the proto file: t/issue220/issue220.proto. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)      
[libprotobuf WARNING ../../protobuf-3.7.1/src/google/protobuf/compiler/parser.cc:564] No syntax specified for the proto file: t/issue220/issue220.proto. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)      
[libprotobuf WARNING ../../protobuf-3.7.1/src/google/protobuf/compiler/parser.cc:564] No syntax specified for the proto file: t/issue251/issue251.proto. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)      
terminate called after throwing an instance of 'std::system_error'                                                                                                                                                                                                               
  what():  Unknown error -1                                                                                                                                                                                                                                                      
[libprotobuf WARNING ../../protobuf-3.7.1/src/google/protobuf/compiler/parser.cc:564] No syntax specified for the proto file: t/issue251/issue251.proto. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)      
terminate called after throwing an instance of 'std::system_error'                                                                                                                                                                                                               
  what():  Unknown error -1                                                                                                                                                                                                                                                      
terminate called after throwing an instance of 'std::system_error'                                                                                                                                                                                                               
  what():  Unknown error -1                                                                                                                                                                                                                                                      
terminate called after throwing an instance of 'std::system_error'                                                                                                                                                                                                               
  what():  Unknown error -1                                                                                                                                                                                                                                                      
terminate called after throwing an instance of 'std::system_error'                                                                                                                                                                                                               
  what():  Unknown error -1                                                                                                                                                                                                                                                      
--c_out: protoc-gen-c: Plugin killed by signal 6.                                                                                                                                                                                                                                
make: *** [Makefile:2401: t/issue251/issue251.pb-c.h] Error 1                                                                                                                                                                                                                    
make: *** Waiting for unfinished jobs....                                                                                                                                                                                                                                        
--c_out: protoc-gen-c: Plugin killed by signal 6.                                                                                                                                                                                                                                
make: *** [Makefile:2397: t/test-proto3.pb-c.c] Error 1                                                                                                                                                                                                                          
--c_out: protoc-gen-c: Plugin killed by signal 6.                                                                                                                                                                                                                                
make: *** [Makefile:2397: t/test-proto3.pb-c.h] Error 1                                                                                                                                                                                                                          
--c_out: protoc-gen-c: Plugin killed by signal 6.                                                                                                                                                                                                                                
make: *** [Makefile:2399: t/issue220/issue220.pb-c.c] Error 1
--c_out: protoc-gen-c: Plugin killed by signal 6.
make: *** [Makefile:2401: t/issue251/issue251.pb-c.c] Error 1
--c_out: protoc-gen-c: Plugin killed by signal 6.
make: *** [Makefile:2399: t/issue220/issue220.pb-c.h] Error 1

[InBetweenNames]

Strange, it seems to be passing on my system. I emerged with USE=test -- is that sufficient to run these tests?

[Szpadel]

Strange, I didn't enabled any tests, it looks like those are enabled by default in make. I'll check later what exact use flags I have there

[Szpadel]

OK, i don't have any extra flags set for that, and this error occurs in emerge -e so it shouldn't be caused by any dependency.
Tested it on other system with different cpu and experienced the same issue.

[InBetweenNames]

Still can't reproduce -- comment here if this should be reopened.