GCC:-static和-pie与x86不兼容? [英] GCC: -static and -pie are incompatible for x86?

问题描述

我正在为Android 5.0重新编译一些可执行文件，因为它要求可执行文件为PIE.我能够通过配置(使用独立工具链)时添加一些参数来为ARM重新编译它:

I'm recompiling some executable for Android 5.0 as it requires executables to be PIE. I was able to recompile it for ARM with just adding some arguments while configuring (with standalone toolchain):

export CFLAGS="-I/softdev/arm-libs/include -fPIE"
export CPPLAGS="$CPPFLAGS -fPIE"
export CXXLAGS="$CXXFLAGS -fPIE"
export LDFLAGS="-L/softdev/arm-libs/lib -static -fPIE -pie"

ARM没有错误:

configure:3406: arm-linux-androideabi-gcc -o conftest -I/softdev/arm-libs/include -fPIE  -L/softdev/arm-libs/lib -static -fPIE -pie conftest.c  >&5
configure:3410: $? = 0

但是由于出现错误，我无法对x86做同样的事情:

But i was unable to do the same for x86 as i'm getting error:

export CFLAGS="-I/softdev/x86-libs/include -fPIE"
export CPPLAGS="$CPPFLAGS -fPIE"
export CXXLAGS="$CXXFLAGS -fPIE"
export LDFLAGS="-L/softdev/x86-libs/lib -static -fPIE -pie"

错误:

configure:3336: i686-linux-android-gcc -I/softdev/x86-libs/include -fPIE  -L/softdev/x86-libs/lib -static -fPIE -pie conftest.c  >&5
/softdev/x86-toolchain-gcc4.8/bin/../lib/gcc/i686-linux-android/4.8/../../../../i686-linux-android/bin/ld: fatal error: -pie and -static are incompatible
collect2: error: ld returned 1 exit status
configure:3340: $? = 1

我需要将可执行文件静态链接.怎么了，我该如何解决?

I need executables to be linked statically. What's wrong and how can i fix it?

PS.还尝试使用来自android ndk r9d和r10c的x86独立工具链:

PS. Also tried using x86 standalone toolchain from android ndk r9d and r10c:

./make-standalone-toolchain.sh --toolchain=x86-4.8 --arch=x86 --install-dir=/softdev/x86-toolchain-gcc4.8-r9d --ndk-dir=/softdev/android-ndk-r9d/ --system=darwin-x86_64

推荐答案

我刚刚对te.c中的不足进行了快速测试:

I just did quick test with the fallowing in te.c:

int main( int argc, const char* argv[] )
{
   return 0;
}

运行arm-linux-androideabi-gcc -o conftest -static -FPIE -pie te.c不会产生任何错误.但是file -k conftest输出

Running arm-linux-androideabi-gcc -o conftest -static -FPIE -pie te.c produces no error. However file -k conftest outputs

conftest: ELF 32-bit LSB shared object, ARM, EABI5 version 1 (SYSV), dynamically linked (uses shared libs), not stripped

readelf -l conftest输出 Elf档案类型为DYN(共用物件档案) 入口点0x500 从偏移量52开始有7个程序头.

readelf -l conftest outputs Elf file type is DYN (Shared object file) Entry point 0x500 There are 7 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  PHDR           0x000034 0x00000034 0x00000034 0x000e0 0x000e0 R   0x4
  INTERP         0x000114 0x00000114 0x00000114 0x00013 0x00013 R   0x1
      [Requesting program interpreter: /system/bin/linker]
...

PHDR和INTERP标头的存在指示-pie在arm编译器中静默覆盖-static.为什么我不知道为什么，但是我会认为当-static和-pie一起使用时没有给出警告的错误.相反，像您这样的程序员会给人一种错误的印象，即这两个选项可以一起使用.

The presence of the PHDR and INTERP headers indicates that -pie silently overrides -static in the arm compiler. Why this is I don't know but I would consider it a bug that no warning is given when -static and -pie are used together. Instead programmers like you are left with the false impression that the two options can be used to together on arm.

这里只是要澄清唯一的行为差异，即x86编译器在同时看到--static和--pie时出错，而arm版本在给出--pie的情况下默默地忽略了--static.如果仅给出这些，则两个编译器的行为都是相同的.

Just to clarify the only behavioral difference here is that the x86 compiler errors on seeing both --static and --pie whereas the arm version silently ignores --static if --pie is given. If only one these is given the behavior is the same for both compilers.

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