ios - 几乎赤裸裸的iOS8.4 --> 如何获取链接器？

Question

编辑 2015-29-10。 II. 事实上，-arch armv7 代替了 -arch arm64 并且在不降低优化的情况下工作得很好。

编辑 2015-29-10。 I. 我尝试添加

export CFLAGS="-O1"
export CXXFLAGS="-O1"

在配置之前，出现了同样的错误，这次缺少不同的文件:

 "/usr/local/cctools-arm64-port/bin/ld" -demangle -dynamic -arch arm64 -iphoneos_version_min 5.0.0 -syslibroot /usr/local/iPhoneOS8.4.sdk -o testcpp /var/tmp/testcpp-4f79ac.o -lstdc++ -lSystem
ld: file not found: N?L

我还尝试使用 -O0 优化而不是 -01，结果相同。

编辑 2015-28-10。 II. 我这样做了:

./autogen.sh
export CC="clang -arch arm64 -mios-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.4.sdk"
export CXX="clang++ -arch arm64 -mios-version-min=8.4 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.4.sdk"
./configure -v --host=arm-apple-darwin11 --prefix=/usr/local/lvm-cross/cctools-arm64-port
unset CC CXX
make && sudo make install

然后我在 iDevice 上尝试了一个简单的 hello world，其中 testcpp.cpp 包含:

#include <iostream>
int main()
{
    std::cout << "oijo" << std::endl;
    return 0;
}

编译

clang++ -v -isysroot /usr/local/iPhoneOS8.4.sdk -target arm64-apple-darwin11 testcpp.cpp -o testcpp

这给了我:

clang version 3.7.0 (tags/RELEASE_370/final)
Target: arm64-apple-darwin11
Thread model: posix
 "/usr/local/llvm-ios/bin/clang++" -cc1 -triple arm64-apple-ios5.0.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -Werror=implicit-function-declaration -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -main-file-name testcpp.cpp -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -masm-verbose -target-cpu generic -target-feature +neon -target-abi darwinpcs -target-linker-version 253.3.3 -v -dwarf-column-info -resource-dir /usr/local/llvm-ios/bin/../lib/clang/3.7.0 -isysroot /usr/local/iPhoneOS8.4.sdk -fdeprecated-macro -fdebug-compilation-dir /var/mobile/Documents/CODING/MY/TESTS_0/CPP -ferror-limit 19 -fmessage-length 108 -stack-protector 1 -mstackrealign -fallow-half-arguments-and-returns -fblocks -fobjc-runtime=ios-5.0.0 -fencode-extended-block-signature -fcxx-exceptions -fexceptions -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o /var/tmp/testcpp-f1de66.o -x c++ testcpp.cpp
clang -cc1 version 3.7.0 based upon LLVM 3.7.0 default target arm-apple-darwin14.0.0
ignoring nonexistent directory "/usr/local/iPhoneOS8.4.sdk/usr/include/c++/4.2.1/arm64-apple-darwin10/"
ignoring nonexistent directory "/usr/local/iPhoneOS8.4.sdk/usr/local/include"
ignoring nonexistent directory "/usr/local/iPhoneOS8.4.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/iPhoneOS8.4.sdk/usr/include/c++/4.2.1
 /usr/local/iPhoneOS8.4.sdk/usr/include/c++/4.2.1/backward
 /usr/local/llvm-ios/bin/../lib/clang/3.7.0/include
 /usr/local/iPhoneOS8.4.sdk/usr/include
 /usr/local/iPhoneOS8.4.sdk/System/Library/Frameworks (framework directory)
End of search list.
 "/usr/local/cctools-arm64-port/bin/ld" -demangle -dynamic -arch arm64 -iphoneos_version_min 5.0.0 -syslibroot /usr/local/iPhoneOS8.4.sdk -o testcpp /var/tmp/testcpp-f1de66.o -lstdc++ -lSystem
ld: file not found: ?4
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

我也尝试过在没有unset CC CXX的情况下，获得相同的“成功”...

编辑 2015-28-10。 I. 按照建议使用 cydia 解决方案确实有效，但我肯定想自己构建它，所以我遵循了 https://github.com/tpoechtrager/cctools-port 方式。因为为 mac os 获取/构建 libtool 太无聊了，我切换到一个 vitual box ubuntu 15.10 64 bits，在那里我 sudo apt-get install以下软件包:automake、autogen、libtool、clang-3.7、uuid-dev > 和 llvm-3.7-dev。然后我 cd 进入 cctools 目录并执行以下操作:

./autogen.sh
export CC="clang-3.7 -arch arm64"
export CXX="clang++-3.7 -arch arm64"
./configure --prefix=/home/lvm-ubuntu/Desktop/iPad/cctools-produced/ --host=arm-apple-darwin11
make

(完整的输出位于 new following gist. 中)make 产生以下警告和错误:

clang: warning: argument unused during compilation: '-arch arm64'

../include/foreign/libkern/arm/OSByteOrder.h:11:10: error: redefinition of
  '_OSSwapInt16'
uint16_t _OSSwapInt16(uint16_t data)
         ^
../include/foreign/libkern/i386/_OSByteOrder.h:46:1: note: previous definition
      is here
_OSSwapInt16(
^

以及_OSSwapInt32和_OSSwapInt64的模拟错误...我肯定做错了什么。

---

初始问题。

我在越狱的iPad mini 3 wifi上成功交叉构建了iOS8.4的clang+llvm，主要归功于以下两个问题:

https://stackoverflow.com/questions/32808144/how-to-cross-compile-clang-llvm-3-7-0-for-ios8-x-on-ipad-mini-3/

和

https://stackoverflow.com/questions/23946851/how-to-cross-compile-clang-llvm-for-ios/

设置所有路径等，并尝试了clang++ -v testcpp.cpp -o testcpp，其中testcpp.cpp包含:

int main()
{
    return 0;
}

得到了这个:

clang++: error: unable to execute command: Executable "ld" doesn't exist!
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

(整个详细输出都在这个 gist 中。)

显然我没有 GNU 的 ld 也没有任何真正的“替换”(通过 llvm-clang)，所以我问自己:在这种情况下我的策略是什么？ (由于没有链接器，我什至无法尝试在 iPad 上构建 binutils 来使用其 ld)。

Precision :我希望链接在幕后完成，这样我就可以继续执行 clang++ -v testcpp.cpp -o testcpp，也就是说，我不想自己分几步“手动”进行链接。 (但是脚本也可以，即使我发现使用真正的 ld 替换更优雅......)

备注:在 llvm-clang bin 文件夹中我有这个:

XXXXs-iPad:/usr/local/llvm-ios/bin mobile$ ls -l
total 274412
-rwxr-xr-x 1 root wheel   205456 Oct 18 12:49 FileCheck*
-rwxr-xr-x 1 root wheel  7704096 Oct 18 12:48 bugpoint*
-rwxr-xr-x 1 root wheel   122036 Oct 18 12:48 c-index-test*
-rwxr-xr-x 1 root wheel 40802004 Oct 18 12:48 clang*
-rwxr-xr-x 1 root wheel 40802004 Oct 18 12:49 clang++*
-rwxr-xr-x 1 root wheel 31252792 Oct 18 12:49 clang-check*
-rwxr-xr-x 1 root wheel  1225352 Oct 18 12:49 clang-format*
-rwxr-xr-x 1 root wheel   671500 Oct 18 12:49 clang-tblgen*
-rwxr-xr-x 1 root wheel    49684 Oct 18 12:49 count*
-rwxr-xr-x 1 root wheel 22439396 Oct 18 12:49 llc*
-rwxr-xr-x 1 root wheel 10351388 Oct 18 12:49 lli*
-rwxr-xr-x 1 root wheel   208140 Oct 18 12:49 lli-child-target*
-rwxr-xr-x 1 root wheel  9144692 Oct 18 12:49 llvm-ar*
-rwxr-xr-x 1 root wheel  1619592 Oct 18 12:49 llvm-as*
-rwxr-xr-x 1 root wheel   155080 Oct 18 12:49 llvm-bcanalyzer*
-rwxr-xr-x 1 root wheel   120864 Oct 18 12:49 llvm-config*
-rwxr-xr-x 1 root wheel    92232 Oct 18 12:49 llvm-config-host*
-rwxr-xr-x 1 root wheel  1604600 Oct 18 12:49 llvm-cov*
-rwxr-xr-x 1 root wheel  1472656 Oct 18 12:49 llvm-cxxdump*
-rwxr-xr-x 1 root wheel  1471516 Oct 18 12:49 llvm-diff*
-rwxr-xr-x 1 root wheel  1225632 Oct 18 12:49 llvm-dis*
-rwxr-xr-x 1 root wheel 18342488 Oct 18 12:49 llvm-dsymutil*
-rwxr-xr-x 1 root wheel   419892 Oct 18 12:49 llvm-dwarfdump*
-rwxr-xr-x 1 root wheel  1686496 Oct 18 12:49 llvm-extract*
-rwxr-xr-x 1 root wheel  1800856 Oct 18 12:49 llvm-link*
-rwxr-xr-x 1 root wheel 10140692 Oct 18 12:49 llvm-mc*
-rwxr-xr-x 1 root wheel   138552 Oct 18 12:49 llvm-mcmarkup*
-rwxr-xr-x 1 root wheel  9144172 Oct 18 12:49 llvm-nm*
-rwxr-xr-x 1 root wheel 11554352 Oct 18 12:49 llvm-objdump*
-rwxr-xr-x 1 root wheel   220840 Oct 18 12:49 llvm-pdbdump*
-rwxr-xr-x 1 root wheel   469920 Oct 18 12:49 llvm-profdata*
-rwxr-xr-x 1 root wheel  9144692 Oct 18 12:49 llvm-ranlib*
-rwxr-xr-x 1 root wheel  1768528 Oct 18 12:49 llvm-readobj*
-rwxr-xr-x 1 root wheel  8388100 Oct 18 12:50 llvm-rtdyld*
-rwxr-xr-x 1 root wheel  1489124 Oct 18 12:50 llvm-size*
-rwxr-xr-x 1 root wheel  2106052 Oct 18 12:50 llvm-stress*
-rwxr-xr-x 1 root wheel  1610176 Oct 18 12:50 llvm-symbolizer*
-rwxr-xr-x 1 root wheel  1422732 Oct 18 12:50 llvm-tblgen*
-rwxr-xr-x 1 root wheel  1455516 Oct 18 12:50 macho-dump*
-rwxr-xr-x 1 root wheel    71184 Oct 18 12:50 not*
-rwxr-xr-x 1 root wheel  1620520 Oct 18 12:50 obj2yaml*
-rwxr-xr-x 1 root wheel 23007212 Oct 18 12:50 opt*
-rwxr-xr-x 1 root wheel  1768416 Oct 18 12:50 verify-uselistorder*
-rwxr-xr-x 1 root wheel   402360 Oct 18 12:50 yaml2obj*

Answer 1

通过 Cydia 安装 org.coolstar.cctools 和 org.coolstar.ld64。

或者，或者，构建 https://github.com/tpoechtrager/cctools-port手工制作。

CXX="clang++ -arch arm64"CC="clang -arch arm64"./configure --host=arm-apple-darwin11