我正在尝试在项目中使用Poco C ++库，而在为Android进行构建时遇到了一些问题。
我使用Conan C ++程序包管理器作为基础，但我将Poco源代码包含在项目中，并将其子目录包含在项目的顶级CMakeLists.txt中，以使过程更加透明。
如果我使用不依赖于OpenSSL的Poco库构建项目，则可以正常构建。如果我添加Poco的NetSSL，则会遇到一些与math.h相关的问题：
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据我所知，这是由于路径C中先前包含的纯C语言math.h beeing作为libc ++ math.h。有谁知道如何解决这个问题？
实际上，我正在尝试找到一种解决方案，以在使用柯南依赖关系和构建要求时构建和链接无法为Android正确构建的Poco库（由于一些与OpenSSL依赖关系的构建问题），而android-ndk / r18 @ theodelrieu / testing或Ubuntu 18.04上的android_ndk_installer / r19b @ bincrafters / stable。因此，我试图在不使用Conan软件包的情况下构建Poco库并对其进行OpenSSL。
在此先感谢您的提示或想法！
这是我的Android版柯南个人资料：
In file included from /home/uname/storage/projects/-some-project-/thirdparty/poco/Crypto/src/Cipher.cpp:15:
In file included from /home/uname/storage/projects/-some-project-/thirdparty/poco/Crypto/include/Poco/Crypto/Cipher.h:22:
In file included from /home/uname/storage/projects/-some-project-/thirdparty/poco/Foundation/include/Poco/RefCountedObject.h:22:
In file included from /home/uname/storage/projects/-some-project-/thirdparty/poco/Foundation/include/Poco/MemoryPool.h:24:
In file included from /home/uname/storage/projects/-some-project-/thirdparty/poco/Foundation/include/Poco/NestedDiagnosticContext.h:24:
In file included from /home/uname/storage/projects/-some-project-/thirdparty/poco/Foundation/include/Poco/OrderedMap.h:28:
In file included from /home/uname/storage/projects/-some-project-/thirdparty/poco/Foundation/include/Poco/ordered_hash.h:31:
/home/uname/.conan/data/android-ndk/r18/theodelrieu/testing/package/2296cbf988942dec6e0ebdfef682b5c678acade8/sources/cxx-stl/llvm-libc++/include/cmath:313:9: error: no member named 'signbit' in the global
namespace; did you mean '__signbit'?
using ::signbit;
~~^
/usr/include/bits/mathcalls-helper-functions.h:25:20: note: '__signbit' declared here
__MATHDECL_1 (int, __signbit,, (_Mdouble_ __value))
和根CMakeLists.txt
# --------------------------------------------------------------------------------------------------------------------
# PARAMETERS
#standalone_toolchain=/home/uname/Android/ndk/android-ndk-r19b/toolchains/llvm/prebuilt/linux-x86_64
target_host=armv7a-linux-androideabi
ar_host=arm-linux-androideabi
api_level=21
cc_compiler=clang
cxx_compiler=clang++
# --------------------------------------------------------------------------------------------------------------------
[settings]
os_build=Linux
arch_build=x86_64
compiler=clang
compiler.version=7.0
compiler.libcxx=libc++
os=Android
os.api_level=$api_level
arch=armv7
#Debug/Release
build_type=Debug
# --------------------------------------------------------------------------------------------------------------------
[build_requires]
android-ndk/r18@theodelrieu/testing
#android_ndk_installer/r19b@bincrafters/stable
# --------------------------------------------------------------------------------------------------------------------
[options]
*:shared=False
#Poco:no_asm=True
# --------------------------------------------------------------------------------------------------------------------
[env]
CONAN_CMAKE_FIND_ROOT_PATH=$standalone_toolchain/sysroot
PATH=[$standalone_toolchain/bin]
CHOST=$target_host
# Flags can be also appended after the path to the compiler
CC=$target_host$api_level-$cc_compiler
CXX=$target_host$api_level-$cxx_compiler
CMAKE_C_COMPILER=$CC
CMAKE_CXX_COMPILER=$CXX
AR=$ar_host-ar
AS=$ar_host-as
RANLIB=$target_host-ranlib
LD=$target_host-ld
STRIP=$target_host-strip
CFLAGS= -fPIE -fPIC -I$standalone_toolchain/include/c++/4.9.x
CXXFLAGS= -fPIE -fPIC -I$standalone_toolchain/include/c++/4.9.x
LDFLAGS= -pie
export ANDROID_API=$api_level
OpenSSL:compiler=clang
OpenSSL:options.no_zlib=True
PS：我是否使用正确的方法，还是应该尝试以其他方式包含和构建适用于Android的Poco库和OpenSSL？主要目标是Android和iOS设备以及用于开发和测试的本地macOS或Linux。
答案 0 :(得分：0)
虽然上述方法尚未解决此问题，但我发现通过以下组合可将其与柯南软件包一起使用：
conanfile.py：
requires = "OpenSSL/1.0.2r@conan/stable", "Poco/1.9.0@pocoproject/stable"
〜/ .conan / profiles / android
# ------------------------------------------------------------------------------
# PARAMETERS
target_host=armv7a-linux-androideabi
ar_host=arm-linux-androideabi
api_level=21
cc_compiler=clang
cxx_compiler=clang++
# ------------------------------------------------------------------------------
[settings]
os_build=Linux
arch_build=x86_64
compiler=clang
compiler.version=8
compiler.libcxx=libc++
os=Android
os.api_level=$api_level
arch=armv7
build_type=Release
# ------------------------------------------------------------------------------
[build_requires]
android_ndk_installer/r19b@bincrafters/stable
# ------------------------------------------------------------------------------
[options]
OpenSSL:shared=False
OpenSSL:no_threads=False
OpenSSL:no_zlib=False
OpenSSL:no_asm=True
OpenSSL:386=False
OpenSSL:no_sse2=False
OpenSSL:no_bf=False
OpenSSL:no_cast=False
OpenSSL:no_des=False
OpenSSL:no_dh=False
OpenSSL:no_cast=False
OpenSSL:no_dsa=False
OpenSSL:no_hmac=False
OpenSSL:no_md2=False
OpenSSL:no_md5=False
OpenSSL:no_rc2=False
OpenSSL:no_rc4=False
OpenSSL:no_rc5=False
OpenSSL:no_rsa=False
OpenSSL:no_sha=False
Poco:shared=False
Poco:enable_tests=False
Poco:cxx_14=True
Poco:force_openssl=True
Poco:enable_xml=True
Poco:enable_json=True
Poco:enable_mongodb=False
Poco:enable_pdf=False
Poco:enable_util=True
Poco:enable_net=True
Poco:enable_netssl=True
Poco:enable_netssl_win=False
Poco:enable_crypto=True
Poco:enable_data=False
Poco:enable_data_sqlite=False
Poco:enable_data_mysql=False
Poco:enable_data_odbc=False
Poco:enable_sevenzip=False
Poco:enable_zip=True
Poco:enable_sevenzip=True
Poco:enable_apacheconnector=False
Poco:enable_cppparser=True
Poco:enable_pocodoc=False
Poco:enable_pagecompiler=False
Poco:enable_pagecompiler_file2page=False