Comments (10)
ZsGyao
commented on June 25, 2024
我在CmakeList中使用_D_const_ = __unused__解决了一部分问题，但是在rpc/rpc_session仍然出现了这个bug
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ZsGyao
commented on June 25, 2024
用的编译器是g++11.3
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ZsGyao
commented on June 25, 2024
您好，对于这个问题，brpc compile failed with error "error: macro "__has_attribute" requires an identifier" #1693 也有相同的问题出现，我使用相同的方法更改，但并未完全解决问题，所以我使用了另一种方法供参考，但这种方法是不推荐的。
这个问题的出现是由于gcc对于const解释不彻底导致的。
sudo vim /usr/include/x86_64-linux-gnu/sys/cdefs.h
进行如下更改
/* This declaration tells the compiler that the value is constant. */
// #if __GNUC_PREREQ (2,5) || __glibc_has_attribute (const)
#if __GNUC_PREREQ (2,5)
define attribute_const attribute ((const))
#else
define attribute_const /* Ignore */
#endif
编译通过
[ 96%] Building CXX object CMakeFiles/acid_static.dir/acid/rpc/rpc_session.cpp.o
[100%] Linking CXX static library ../lib/libacid.a
[100%] Built target acid_static
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ZsGyao
commented on June 25, 2024
同时libgo也存在相同的问题，我已经在libgo提交了issue。
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zavier-wong
commented on June 25, 2024
您好，具体是在rpc/rpc_session的哪个部分代码编译有问题
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ZsGyao
commented on June 25, 2024
感谢您及时的回复
在CmakeList中CXX_FLAGS中将参数-D__const__= 改为 -D__const__=__unused__可以解决下面这个报错
[ 3%] Building CXX object CMakeFiles/acid_static.dir/acid/common/byte_array.cpp.o
In file included from /usr/include/features.h:486,
from /usr/include/x86_64-linux-gnu/c++/11/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/11/bits/c++config.h:586,
from /usr/include/c++/11/iosfwd:38,
from /usr/include/c++/11/ios:38,
from /usr/include/c++/11/istream:38,
from /usr/include/c++/11/fstream:38,
from /home/xxx/Downloads/acid/acid/common/byte_array.cpp:5:
/usr/include/x86_64-linux-gnu/sys/cdefs.h:314:60: error: macro "__has_attribute" requires an identifier
314 | #if __GNUC_PREREQ (2,5) || __glibc_has_attribute (__const__)
| ^
make[2]: *** [CMakeFiles/acid_static.dir/build.make:76：CMakeFiles/acid_static.dir/acid/common/byte_array.cpp.o] 错误 1
make[1]: *** [CMakeFiles/Makefile2:83：CMakeFiles/acid_static.dir/all] 错误 2
make: *** [Makefile:91：all] 错误 2
这是参考brpc的方案解决的，但是在后续编译时仍然遇到了下面这个报错，在试过修改系统的方式(上面提到的)后可以通过编译，我认为可能不是代码的问题。ps. libgo在修改-D__const__=__unused__后已经通过make && make install，我不清楚这由于是不是libgo的引起的
具体报错如下
[ 93%] Building CXX object CMakeFiles/acid_static.dir/acid/rpc/rpc_server.cpp.o
[ 96%] Building CXX object CMakeFiles/acid_static.dir/acid/rpc/rpc_session.cpp.o
In file included from /usr/include/features.h:486,
from /usr/include/x86_64-linux-gnu/c++/11/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/11/bits/c++config.h:586,
from /usr/include/c++/11/type_traits:38,
from /usr/include/c++/11/unordered_map:38,
from /usr/local/include/libgo/common/config.h:3,
from /usr/local/include/libgo/coroutine.h:3,
from /usr/local/include/libgo/libgo.h:2,
from /home/xxx/Downloads/acid/acid/rpc/rpc_session.h:8,
from /home/xxx/Downloads/acid/acid/rpc/rpc_session.cpp:5:
/usr/include/x86_64-linux-gnu/sys/cdefs.h:314:60: error: macro "__has_attribute" requires an identifier
314 | #if __GNUC_PREREQ (2,5) || __glibc_has_attribute (__const__)
| ^
make[2]: *** [CMakeFiles/acid_static.dir/build.make:454：CMakeFiles/acid_static.dir/acid/rpc/rpc_session.cpp.o] 错误 1
make[1]: *** [CMakeFiles/Makefile2:83：CMakeFiles/acid_static.dir/all] 错误 2
make: *** [Makefile:91：all] 错误 2
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zavier-wong
commented on June 25, 2024
晕，这bug完全没有头绪啊😂
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ZsGyao
commented on June 25, 2024
hhh，我也觉得，之前弄了一天，最后只能改系统那个文件啦，编译完改回来就可以了。
不过感觉在g++11没解决这个问题前，cmake的cxx_flag里加上-D__const__=__unused__是推荐的，可以看一下我提交的pr
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zavier-wong
commented on June 25, 2024
我好像找到了，之前模仿libgo写cmake，把这条一起写进CMakeList了
set(CMAKE_CXX_FLAGS "-std=c++20 -D__const__= -fPIC -fno-strict-aliasing -Wall ${CMAKE_CXX_FLAGS}")
但是我并不需要-D__const__= 这条flag
所以这行应该改为set(CMAKE_CXX_FLAGS "-std=c++20 -fPIC -fno-strict-aliasing -Wall ${CMAKE_CXX_FLAGS}")
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ZsGyao
commented on June 25, 2024
尝试了一下，还是出现了这种问题🧐，暂时没什么其他解决办法了
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