abseil-cpp:环境搭建

参考: abseil.io/docs/cpp/quickstart-cmake

abseil-cpp.git/dd4c89b == abseil-cpp.git/20240722.1

1. clone代码仓库、编译 git clone github /abseil/abseil-cpp.git /app/abseil-cpp/ #/app/abseil-cpp/.git/config git checkout 20240722.1 git rev-parse HEAD #dd4c89bd657f1e247ce5111a5c89ffe6ccfd0c92 cmake -S /app/abseil-cpp -B /app/abseil-cpp/build -DABSL_BUILD_TESTING=OFF -DABSL_USE_GOOGLETEST_HEAD=ON -DCMAKE_CXX_STANDARD=14 cmake --build /app/abseil-cpp/build --target all ls /app/abseil-cpp/absl/strings/str_split.h 2. test.cpp #include <string> #include <vector> #include "absl/strings/str_split.h" #include <stdio.h> int main(int argc, char** argv){ std::vector<std::string> v = absl::StrSplit("a,b,c", ','); printf("v[0]=%s\n",v[0].c_str()); return 0; } 3. 编译运行 /app/llvm_release_home/clang+llvm-15.0.0-x86_64-linux-gnu-rhel-8.4/bin/clang++ -v -L /app/abseil-cpp/build/absl/base/ -L /app/abseil-cpp/build/absl/strings/ -l absl_base -l absl_raw_logging_internal -l absl_throw_delegate -l absl_string_view -l absl_strings_internal -l absl_strings -I /app/abseil-cpp/ test.cpp -o test.elf && ./test.elf

正常运行，并输出a

3A. 当少给 .a时 链接报错举例 /app/llvm_release_home/clang+llvm-15.0.0-x86_64-linux-gnu-rhel-8.4/bin/clang++ -v -L /app/abseil-cpp/build/absl/base/ -L /app/abseil-cpp/build/absl/strings/ -L /app/abseil-cpp/build/absl/log/ -l absl_base -l absl_log_internal_format -l absl_string_view -l absl_strings_internal -l absl_strings -I /app/abseil-cpp/ test.cpp -o test.elf && ./test.elf

报错

"/usr/bin/ld" -pie -z relro --hash-style=gnu --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 -o test.elf /lib/x86_64-linux-gnu/Scrt1.o /lib/x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/12/crtbeginS.o -L/app/abseil-cpp/build/absl/base/ -L/app/abseil-cpp/build/absl/strings/ -L/app/abseil-cpp/build/absl/log/ -L/app/llvm_release_home/clang+llvm-15.0.0-x86_64-linux-gnu-rhel-8.4/bin/../lib/x86_64-unknown-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/12 -L/usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/lib/../lib64 -L/usr/lib/gcc/x86_64-linux-gnu/12/../../../../lib64 -L/lib/x86_64-linux-gnu -L/lib/../lib64 -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/lib -L/lib -L/usr/lib -labsl_base -labsl_log_internal_format -labsl_string_view -labsl_strings_internal -labsl_strings /tmp/test-9d0c36.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-linux-gnu/12/crtendS.o /lib/x86_64-linux-gnu/crtn.o mold: error: undefined symbol: /app/abseil-cpp/build/absl/strings/libabsl_strings.a(str_split.cc.o): absl::lts_20240722::raw_log_internal::RawLog(absl::lts_20240722::LogSeverity, char const*, int, char const*, ...) mold: error: undefined symbol: /app/abseil-cpp/build/absl/strings/libabsl_strings.a(str_split.cc.o): absl::lts_20240722::base_internal::ThrowStdOutOfRange(char const*) clang-15: error: linker command failed with exit code 1 (use -v to see invocation) 3B. 报错探索并解决: nushell 在*.a中查找给定函数所在.a

nushell == /app5/nu-0.102.0-x86_64-unknown-linux-gnu/nu

3A报错缺少函数

absl::lts_20240722::raw_log_internal::RawLogabsl::lts_20240722::base_internal::ThrowStdOutOfRange

以下用nushell查找这些函数所在.a

/usr/bin/find /app/abseil-cpp/build/absl/ -name "*.a" | lines|each { |f| nm --defined-only -C $f } | str contains "absl::lts_20240722::base_internal::ThrowStdOutOfRange" | /usr/bin/grep true # │ 8 │ true │ /usr/bin/find /app/abseil-cpp/build/absl/ -name "*.a" | lines|each { |f| $f } | /usr/bin/grep " 8 " #│ 8 │ /app/abseil-cpp/build/absl/base/libabsl_throw_delegate.a │ /usr/bin/find /app/abseil-cpp/build/absl/ -name "*.a" | lines|each { |f| nm --defined-only -C $f } | str contains "absl::lts_20240722::raw_log_internal::RawLog" | /usr/bin/grep true # │ 4 │ true │ /usr/bin/find /app/abseil-cpp/build/absl/ -name "*.a" | lines|each { |f| $f } | /usr/bin/grep " 4 " # │ 4 │ /app/abseil-cpp/build/absl/base/libabsl_raw_logging_internal.a │