error: only position independent executables (PIE) are supported

PIE, position independent executables.

Android 4.1上开始支持PIE，所以4.1之前的版本不能使用PIE的executable，而之前开发的app一般都是非PIE的。

Android 4.1        PIE (Position Independent Executable) support        Read-only relocations / immediate binding (-Wl,-z,relro -Wl,-z,now)        dmesg_restrict enabled (avoid leaking kernel addresses)        kptr_restrict enabled (avoid leaking kernel addresses)
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在android L后，linker.cpp中，

//bionic\linker\linker.cppstatic ElfW(Addr) __linker_init_post_relocation(KernelArgumentBlock& args, ElfW(Addr) linker_base) {  ElfW(Ehdr)* elf_hdr = reinterpret_cast<ElfW(Ehdr)*>(si->base);  //不是PIE的直接报错返回，而之前的版本中都没有  if (elf_hdr->e_type != ET_DYN) {    __libc_format_fd(2, "error: only position independent executables (PIE) are supported.\n");    exit(EXIT_FAILURE);  }}
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所以在android L后，非PIE的exe执行都会报错error: only position independent executables (PIE) are supported.。

1.但是如果在android 4.1之前的版本运行PIE, 也是有办法的： 
The Chromium project released a wrapper that allows PIE binaries to run on pre-JB Android releases。

具体的使用方法见http://stackoverflow.com/questions/24818902/running-a-native-library-on-android-l-error-only-position-independent-executab，

其中run_pie在android L中的external\chromium_org\tools\android\run_pie中可找到，下面是run_pie.c中的注释，说明run_pie主要是为了在linker不支持PIE的早期版本中运行PIE。

// This is a wrapper to run position independent executables on Android ICS,// where the linker doesn't support PIE. This requires the PIE binaries to be// built with CFLAGS +=-fvisibility=default -fPIE, and LDFLAGS += -rdynamic -pie// such that the main() symbol remains exported and can be dlsym-ed.
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2.那么在android L之后的版本运行非PIE，有没有办法？ 
目前是没有解决方案，除非你把bionic的linker替换，具体参考下面的文章，使用其中修改编译过的linker, http://forum.xda-developers.com/google-nexus-5/development/fix-bypassing-pie-security-check-t2797731

LOCAL_PATH := $(call my-dir)# Forcefully disable PIE globally. This makes it possible to# build some binaries without PIE by adding the necessary flags# manually. These will not get reset by $(CLEAR_VARS). PIE is# force-enabled on NDK 10b so we'll need this even if APP_PIE# is set to false.TARGET_PIE := falseNDK_APP_PIE := falseinclude $(CLEAR_VARS)# Enable PIE manually. Will get reset on $(CLEAR_VARS). This# is what enabling PIE translates to behind the scenes.LOCAL_CFLAGS += -fPIELOCAL_LDFLAGS += -fPIE -pieLOCAL_MODULE := mymodLOCAL_SRC_FILES := \    mymod.cinclude $(BUILD_EXECUTABLE)include $(CLEAR_VARS)LOCAL_MODULE := mymod-nopieLOCAL_SRC_FILES := \    mymod.cinclude $(BUILD_EXECUTABLE)