问题
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"
No error for ARM:
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: $? = 0
But i was unable to do the same for x86 as i'm getting error:
export CFLAGS="-I/softdev/x86-libs/include -fPIE"
export CPPLAGS="$CPPFLAGS -fPIE"
export CXXLAGS="$CXXFLAGS -fPIE"
export LDFLAGS="-L/softdev/x86-libs/lib -static -fPIE -pie"
error:
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
I need executables to be linked statically. What's wrong and how can i fix it?
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
回答1:
I just did quick test with the fallowing in te.c:
int main( int argc, const char* argv[] )
{
return 0;
}
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 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]
...
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.
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.
回答2:
If -pie and -static are both given together, gcc will issue unexpected error.
-pie
Produce a position independent executable on targets that support it. For predictable results, you must also specify the same set of options used for compilation (-fpie, -fPIE, or model suboptions) when you specify this linker option.
-pie actually create a DYN type elf file with INTERP with /system/bin/linker
executable compiled with -pie
-static
On systems that support dynamic linking, this prevents linking with the shared libraries. On other systems, this option has no effect.
-static create a EXEC type elf file with no INTERP
回答3:
Google's NDK tool contain some info about PIE usage. Visit build/core/build-binary.mk, see line 209. It says:
# enable PIE for executable beyond certain API level, unless "-static"
I guess, it is linux dynamic link principle's limit. Because Android interpreter (/system/bin/linker) determining which address elf file to be loaded in a static linked file has no interpreter, elf file will be mapped to memory into a fixed address by linux kernel. Here is a discuss about this change Google issue
If I have any mistake please figure it out:)
来源：https://stackoverflow.com/questions/27082959/gcc-static-and-pie-are-incompatible-for-x86