问题描述
我正在尝试使用cygwin编译平面缓冲区。
这是我的工作：
git clone https://github.com/google/flatbuffers.git && cd ./flatbuffers
比：
cmake .
-- The C compiler identification is GNU 10.2.0
-- The CXX compiler identification is GNU 10.2.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc - works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++.exe
-- Check for working CXX compiler: /usr/bin/c++.exe - works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for strtof_l
-- Looking for strtof_l - not found
-- Looking for strtoull_l
-- Looking for strtoull_l - not found
-- `tests/monster_test.fbs`: add generation of C++ code with '--no-includes;--gen-compare'
-- `tests/monster_test.fbs`: add generation of binary (.bfbs) schema
-- `tests/namespace_test/namespace_test1.fbs`: add generation of C++ code with '--no-includes;--gen-compare'
-- `tests/namespace_test/namespace_test2.fbs`: add generation of C++ code with '--no-includes;--gen-compare'
-- `tests/union_vector/union_vector.fbs`: add generation of C++ code with '--no-includes;--gen-compare'
-- `tests/optional_scalars.fbs`: add generation of C++ code with '--no-includes;--gen-compare'
-- `tests/native_type_test.fbs`: add generation of C++ code with ''
-- `tests/arrays_test.fbs`: add generation of C++ code with '--scoped-enums;--gen-compare'
-- `tests/arrays_test.fbs`: add generation of binary (.bfbs) schema
-- `tests/monster_test.fbs`: add generation of C++ embedded binary schema code with '--no-includes;--gen-compare'
-- `tests/monster_extra.fbs`: add generation of C++ code with '--no-includes;--gen-compare'
-- `samples/monster.fbs`: add generation of C++ code with '--no-includes;--gen-compare'
-- `samples/monster.fbs`: add generation of binary (.bfbs) schema
Proceeding with version: 1.12.0.177
-- Configuring done
-- Generating done
-- Build files have been written to: /home/Vivas/flatbuffers
当我跑步时：
$ make
Scanning dependencies of target flatbuffers
[ 1%] Building CXX object CMakeFiles/flatbuffers.dir/src/idl_parser.cpp.o
[ 2%] Building CXX object CMakeFiles/flatbuffers.dir/src/idl_gen_text.cpp.o
[ 3%] Building CXX object CMakeFiles/flatbuffers.dir/src/reflection.cpp.o
[ 4%] Building CXX object CMakeFiles/flatbuffers.dir/src/util.cpp.o
[ 5%] Linking CXX static library libflatbuffers.a
[ 5%] Built target flatbuffers
Scanning dependencies of target flatc
[ 6%] Building CXX object CMakeFiles/flatc.dir/src/idl_parser.cpp.o
[ 7%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_text.cpp.o
[ 9%] Building CXX object CMakeFiles/flatc.dir/src/reflection.cpp.o
[ 10%] Building CXX object CMakeFiles/flatc.dir/src/util.cpp.o
[ 11%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_cpp.cpp.o
[ 12%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_csharp.cpp.o
[ 13%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_dart.cpp.o
[ 14%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_kotlin.cpp.o
[ 15%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_go.cpp.o
[ 17%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_java.cpp.o
[ 18%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_js_ts.cpp.o
[ 19%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_PHP.cpp.o
[ 20%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_python.cpp.o
[ 21%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_lobster.cpp.o
[ 22%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_lua.cpp.o
[ 23%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_rust.cpp.o
[ 25%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_fbs.cpp.o
[ 26%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_grpc.cpp.o
[ 27%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_json_schema.cpp.o
[ 28%] Building CXX object CMakeFiles/flatc.dir/src/idl_gen_swift.cpp.o
[ 29%] Building CXX object CMakeFiles/flatc.dir/src/flatc.cpp.o
[ 30%] Building CXX object CMakeFiles/flatc.dir/src/flatc_main.cpp.o
[ 31%] Building CXX object CMakeFiles/flatc.dir/src/code_generators.cpp.o
[ 32%] Building CXX object CMakeFiles/flatc.dir/grpc/src/compiler/cpp_generator.cc.o
[ 34%] Building CXX object CMakeFiles/flatc.dir/grpc/src/compiler/go_generator.cc.o
[ 35%] Building CXX object CMakeFiles/flatc.dir/grpc/src/compiler/java_generator.cc.o
[ 36%] Building CXX object CMakeFiles/flatc.dir/grpc/src/compiler/python_generator.cc.o
[ 37%] Building CXX object CMakeFiles/flatc.dir/grpc/src/compiler/swift_generator.cc.o
[ 38%] Building CXX object CMakeFiles/flatc.dir/grpc/src/compiler/ts_generator.cc.o
[ 39%] Linking CXX executable flatc.exe
[ 39%] Built target flatc
Scanning dependencies of target generated_code
[ 40%] Run generation: 'samples/monster.bfbs'
[ 42%] Run generation: 'tests/monster_test_generated.h'
[ 43%] Run generation: 'tests/monster_test.bfbs'
[ 44%] Run generation: 'tests/namespace_test/namespace_test1_generated.h'
[ 45%] Run generation: 'tests/namespace_test/namespace_test2_generated.h'
[ 46%] Run generation: 'tests/union_vector/union_vector_generated.h'
[ 47%] Run generation: 'tests/optional_scalars_generated.h'
[ 48%] Run generation: 'tests/native_type_test_generated.h'
[ 50%] Run generation: 'tests/arrays_test_generated.h'
[ 51%] Run generation: 'tests/arrays_test.bfbs'
[ 52%] Run generation: 'tests/monster_test_bfbs_generated.h'
[ 53%] Run generation: 'tests/monster_extra_generated.h'
[ 54%] Run generation: 'samples/monster_generated.h'
[ 55%] All generated files were updated.
[ 55%] Built target generated_code
Scanning dependencies of target flatsamplebfbs
[ 56%] Building CXX object CMakeFiles/flatsamplebfbs.dir/src/idl_parser.cpp.o
[ 57%] Building CXX object CMakeFiles/flatsamplebfbs.dir/src/idl_gen_text.cpp.o
[ 59%] Building CXX object CMakeFiles/flatsamplebfbs.dir/src/reflection.cpp.o
[ 60%] Building CXX object CMakeFiles/flatsamplebfbs.dir/src/util.cpp.o
[ 61%] Building CXX object CMakeFiles/flatsamplebfbs.dir/samples/sample_bfbs.cpp.o
[ 62%] Linking CXX executable flatsamplebfbs.exe
[ 63%] Built target flatsamplebfbs
Scanning dependencies of target flatsampletext
[ 64%] Building CXX object CMakeFiles/flatsampletext.dir/src/idl_parser.cpp.o
[ 65%] Building CXX object CMakeFiles/flatsampletext.dir/src/idl_gen_text.cpp.o
[ 67%] Building CXX object CMakeFiles/flatsampletext.dir/src/reflection.cpp.o
[ 68%] Building CXX object CMakeFiles/flatsampletext.dir/src/util.cpp.o
[ 69%] Building CXX object CMakeFiles/flatsampletext.dir/samples/sample_text.cpp.o
[ 70%] Linking CXX executable flatsampletext.exe
[ 71%] Built target flatsampletext
Scanning dependencies of target flathash
[ 72%] Building CXX object CMakeFiles/flathash.dir/src/flathash.cpp.o
[ 73%] Linking CXX executable flathash.exe
[ 73%] Built target flathash
Scanning dependencies of target flattests
[ 75%] Building CXX object CMakeFiles/flattests.dir/src/idl_parser.cpp.o
[ 76%] Building CXX object CMakeFiles/flattests.dir/src/idl_gen_text.cpp.o
[ 77%] Building CXX object CMakeFiles/flattests.dir/src/reflection.cpp.o
[ 78%] Building CXX object CMakeFiles/flattests.dir/src/util.cpp.o
[ 79%] Building CXX object CMakeFiles/flattests.dir/src/idl_gen_fbs.cpp.o
[ 80%] Building CXX object CMakeFiles/flattests.dir/tests/test.cpp.o
/home/Vivas/flatbuffers/tests/test.cpp:66:19: error: ‘const auto infinityf’ redeclared as different kind of entity
66 | static const auto infinityf = std::numeric_limits<float>::infinity();
| ^~~~~~~~~
In file included from /usr/lib/gcc/x86_64-pc-cygwin/10/include/c++/cmath:45,from /home/Vivas/flatbuffers/tests/test.cpp:16:
/usr/include/math.h:398:14: note: prevIoUs declaration ‘float infinityf()’
398 | extern float infinityf (void);
| ^~~~~~~~~
In file included from /home/Vivas/flatbuffers/tests/test.cpp:45:
/home/Vivas/flatbuffers/tests/test.cpp: In function ‘void TestMonsterExtraFloats()’:
/home/Vivas/flatbuffers/tests/test.cpp:702:25: error: wrong type argument to unary minus
702 | TEST_EQ(is_quiet_nan(-infinityf),false);
| ^~~~~~~~~
/home/Vivas/flatbuffers/tests/test_assert.h:19:34: note: in deFinition of macro ‘TEST_EQ’
19 | #define TEST_EQ(exp,val) TestEq(exp,val,"'" #exp "' != '" #val "'",__FILE__,__LINE__,"")
| ^~~
/home/Vivas/flatbuffers/tests/test.cpp:731:29: error: wrong type argument to unary minus
731 | TEST_EQ(def_extra->f3(),-infinityf);
| ^~~~~~~~~
/home/Vivas/flatbuffers/tests/test_assert.h:19:39: note: in deFinition of macro ‘TEST_EQ’
19 | #define TEST_EQ(exp,"")
| ^~~
/home/Vivas/flatbuffers/tests/test.cpp:762:25: error: wrong type argument to unary minus
762 | TEST_EQ(extra->f3(),-infinityf);
| ^~~~~~~~~
/home/Vivas/flatbuffers/tests/test_assert.h:19:39: note: in deFinition of macro ‘TEST_EQ’
19 | #define TEST_EQ(exp,"")
| ^~~
/home/Vivas/flatbuffers/tests/test.cpp:770:35: error: wrong type argument to unary minus
770 | TEST_EQ(extra->fvec()->Get(1),-infinityf);
| ^~~~~~~~~
/home/Vivas/flatbuffers/tests/test_assert.h:19:39: note: in deFinition of macro ‘TEST_EQ’
19 | #define TEST_EQ(exp,"")
| ^~~
/home/Vivas/flatbuffers/tests/test.cpp: In function ‘void ValidFloattest()’:
/home/Vivas/flatbuffers/tests/test.cpp:1971:60: error: wrong type argument to unary minus
1971 | TEST_EQ(TestValue<float>("{ y:-3.4029e+38 }","float"),-infinityf);
| ^~~~~~~~~
/home/Vivas/flatbuffers/tests/test_assert.h:19:39: note: in deFinition of macro ‘TEST_EQ’
19 | #define TEST_EQ(exp,"")
| ^~~
/home/Vivas/flatbuffers/tests/test.cpp:2015:53: error: wrong type argument to unary minus
2015 | TEST_EQ(TestValue<float>("{ y:-inf }",-infinityf);
| ^~~~~~~~~
/home/Vivas/flatbuffers/tests/test_assert.h:19:39: note: in deFinition of macro ‘TEST_EQ’
19 | #define TEST_EQ(exp,"")
| ^~~
/home/Vivas/flatbuffers/tests/test.cpp:2017:53: error: wrong type argument to unary minus
2017 | TEST_EQ(TestValue<float>(nullptr,"float=-inf"),"")
| ^~~
/home/Vivas/flatbuffers/tests/test_assert.h: In instantiation of ‘void TestEq(T,U,const char*,int,const char*) [with T = float; U = float (*)()]’:
/home/Vivas/flatbuffers/tests/test.cpp:730:3: required from here
/home/Vivas/flatbuffers/tests/test_assert.h:92:7: error: invalid ‘static_cast’ from type ‘float’ to type ‘float (*)()’
92 | if (static_cast<U>(expval) != val) {
| ^~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [CMakeFiles/flattests.dir/build.make:184: CMakeFiles/flattests.dir/tests/test.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:247: CMakeFiles/flattests.dir/all] Error 2
make: *** [Makefile:161: all] Error 2
那是为什么，我该如何解决？
解决方法
最简单的方法是重命名infinityf（在tests/test.cpp:66:19处），并将其用法更改为其他名称。如果可以编译，请在https://github.com/google/flatbuffers上打开所做的更改。
似乎与cmath标头中声明的内容冲突。我不确定为什么cygwin会发生这种情况，而不是在我们为gcc构建的其他平台上不会发生这种情况？
还请注意，这是在测试中，您完全不需要构建它们。用-DFLATBUFFERS_BUILD_TESTS=OFF调用CMake可能也可以。