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编译失败现象如下
+ /usr/bin/make -O -j64 V=1 VERBOSE=1
[ 42s] /usr/bin/protoc -I. --cpp_out=. ./protobuf-c/protobuf-c.proto
[ 42s] /usr/bin/protoc -I. --cpp_out=. ./protobuf-c/protobuf-c.proto
[ 42s] /usr/bin/protoc -I. --cpp_out=. ./t/test-full.proto
[ 42s] [libprotobuf WARNING google/protobuf/compiler/parser.cc:648] No syntax specified for the proto file: t/test-full.proto. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)
[ 42s] /usr/bin/protoc -I. --cpp_out=. ./t/test-full.proto
[ 42s] [libprotobuf WARNING google/protobuf/compiler/parser.cc:648] No syntax specified for the proto file: t/test-full.proto. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)
[ 43s] g++ -std=c++11 -DHAVE_CONFIG_H -I. -include ./config.h -I./protobuf-c -I. -I. -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/generic-hardened-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fexceptions -c -o protoc-c/protoc_gen_c-main.o `test -f 'protoc-c/main.cc' || echo './'`protoc-c/main.cc
[ 43s] g++ -std=c++11 -DHAVE_CONFIG_H -I. -include ./config.h -I./protobuf-c -I. -I. -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/generic-hardened-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fexceptions -c -o protoc-c/protoc_gen_c-c_extension.o `test -f 'protoc-c/c_extension.cc' || echo './'`protoc-c/c_extension.cc
[ 44s] g++ -std=c++11 -DHAVE_CONFIG_H -I. -include ./config.h -I./protobuf-c -I. -I. -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/generic-hardened-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fexceptions -c -o t/generated-code2/cxx_generate_packed_data-cxx-generate-packed-data.o `test -f 't/generated-code2/cxx-generate-packed-data.cc' || echo './'`t/generated-code2/cxx-generate-packed-data.cc
[ 44s] t/generated-code2/cxx-generate-packed-data.cc:5:10: warning: ./t/test-full.pb.h is shorter than expected
[ 44s] 5 | #include "t/test-full.pb.h"
[ 44s] | ^~~~~~~~~~~~~~~~~~
[ 44s] In file included from t/generated-code2/cxx-generate-packed-data.cc:5:
[ 44s] ./t/test-full.pb.h:4: error: unterminated #ifndef
[ 44s] 4 | #ifndef GOOGLE_PROTOBUF_INCLUDED_t_2ftest_2dfull_2eproto
[ 44s] |
[ 44s] In file included from t/generated-code2/cxx-generate-packed-data.cc:5:
[ 44s] ./t/test-full.pb.h: In member function 'void foo::TestRequiredFieldsBitmap::set_field92(const char*)':
[ 44s] ./t/test-full.pb.h:24620:105: error: 'G' was not declared in this scope
[ 44s] 24620 | field92_.Set(::PROTOBUF_NAMESPACE_ID::internal::ArenaStringPtr::EmptyDefault{}, ::std::string(value), GetArena());
为x86偶现失败，失败原因为并行编译时加载test-full.pb.h报错
在个人工程改为make -j 1，用单线程编译100次，arm和x86都未失败，
个人工程：http://117.78.1.88/package/show/home:caodongxia:branches:openEuler:22.09/protobuf-c
多线程编译平均耗时1min，
Revision Time Reason Status Code Build Time Worker
7 August 25, 2022 09:10 meta change succeeded 1m 7s obs-worker1639015616-x86-0009:5
7 August 25, 2022 06:51 meta change succeeded 1m 8s obs-worker1639015616-x86-0007:3
7 August 25, 2022 03:31 meta change succeeded 1m 11s obs-worker1639015616-x86-0007:6
7 August 24, 2022 18:35 meta change succeeded 1m 20s obs-worker1639015616-x86-0011:5
7 August 24, 2022 08:37 meta change succeeded 1m 13s obs-worker1638948070-x86:5
7 August 24, 2022 06:20 meta change succeeded 1m 7s obs-worker1639015616-x86-0020:3
7 August 24, 2022 03:54 meta change succeeded 1m 5s obs-worker1639015616-x86-0007:2
7 August 23, 2022 19:02 meta change succeeded 1m 20s obs-worker1639015616-x86-0011:4
7 August 23, 2022 11:46 meta change succeeded 1m 2s ecs-obsworker-203:1
7 August 23, 2022 06:24 meta change succeeded 1m 0s ecs-obsworker-205:5
个人工程改为单线程编译耗时，平均耗时2min
4 August 24, 2022 13:12 meta change succeeded 1m 34s ecs-obsworker-202:4
4 August 24, 2022 02:59 new build succeeded 1m 33s obs-worker1639015616-x86-0001:6
4 August 24, 2022 02:56 new build succeeded 2m 42s ecs-obsworker-204:3
4 August 24, 2022 02:54 new build succeeded 1m 32s obs-worker1639015616-x86-0001:3
4 August 24, 2022 02:51 new build succeeded 1m 34s obs-worker1639015616-x86-0001:3
4 August 24, 2022 02:48 new build succeeded 1m 37s obs-worker1639015616-x86-0001:4
4 August 24, 2022 02:45 new build succeeded 2m 37s ecs-obsworker-204:1
4 August 24, 2022 02:43 new build succeeded 1m 32s obs-worker1639015616-x86-0001:2
4 August 24, 2022 02:38 new build succeeded 1m 43s ecs-obsworker-202:2
4 August 24, 2022 02:35 new build succeeded 1m 33s obs-worker1639015616-x86-0001:4
由于偶现失败概率并不大，所以建议保留多线程编译
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