How to add libc to android application? - android-ndk

Question

I am writing a C code which I wish to run in android using ndk. I have glibc library in the code which as I understood is difficult to port directly. Hence I tried to use libc instead from the bionic repository in github. I am facing numerous errors while building it.
Could anyone explain how to include libc in a step by step procedure(or guide me to some source). I have searched a lot and was unable to find a tutorial anywhere.
These are the errors I get:
In file included from jni/libc/private/ScopedPthreadMutexLocker.h:22:0,
from jni/libc/bionic/malloc_debug_common.cpp:47:
jni/libc/private/bionic_macros.h:27:31: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11 [enabled by default]
TypeName(const TypeName&) = delete; \
^
jni/libc/private/ScopedPthreadMutexLocker.h:37:3: note: in expansion of macro 'DISALLOW_COPY_AND_ASSIGN'
DISALLOW_COPY_AND_ASSIGN(ScopedPthreadMutexLocker);
^
jni/libc/private/bionic_macros.h:28:37: warning: defaulted and deleted functions only available with -std=c++11 or -std=gnu++11 [enabled by default]
void operator=(const TypeName&) = delete
^
jni/libc/private/ScopedPthreadMutexLocker.h:37:3: note: in expansion of macro 'DISALLOW_COPY_AND_ASSIGN'
DISALLOW_COPY_AND_ASSIGN(ScopedPthreadMutexLocker);
^
In file included from jni/libc/bionic/jemalloc.h:20:0,
from jni/libc/bionic/malloc_debug_common.cpp:50:
jni/libc/jemalloc/jemalloc.h:108:36: error: declaration of C function 'size_t malloc_usable_size(void*)' conflicts with
# define JEMALLOC_CXX_THROW throw()
^
jni/libc/jemalloc/jemalloc.h:231:43: note: in expansion of macro 'JEMALLOC_CXX_THROW'
JEMALLOC_USABLE_SIZE_CONST void *ptr) JEMALLOC_CXX_THROW;
^
In file included from /home/yogi/android-ndk/platforms/android-21/arch-arm/usr/include/string.h:33:0,
from /home/yogi/android-ndk/platforms/android-21/arch-arm/usr/include/signal.h:35,
from /home/yogi/android-ndk/platforms/android-21/arch-arm/usr/include/pthread.h:33,
from jni/libc/bionic/malloc_debug_common.h:36,
from jni/libc/bionic/malloc_debug_common.cpp:40:
/home/yogi/android-ndk/platforms/android-21/arch-arm/usr/include/malloc.h:36:15: error: previous declaration 'size_t malloc_usable_size(const void*)' here
extern size_t malloc_usable_size(const void* p);
^
jni/libc/bionic/malloc_debug_common.cpp:51:27: error: 'je_calloc' was not declared in this scope
#define Malloc(function) je_ ## function
^
jni/libc/bionic/malloc_debug_common.cpp:67:3: note: in expansion of macro 'Malloc'
Malloc(calloc),
^
jni/libc/bionic/malloc_debug_common.cpp:51:27: error: 'je_free' was not declared in this scope
#define Malloc(function) je_ ## function
^
jni/libc/bionic/malloc_debug_common.cpp:68:3: note: in expansion of macro 'Malloc'
Malloc(free),
^
jni/libc/bionic/malloc_debug_common.cpp:51:27: error: 'je_malloc' was not declared in this scope
#define Malloc(function) je_ ## function
^
jni/libc/bionic/malloc_debug_common.cpp:70:3: note: in expansion of macro 'Malloc'
Malloc(malloc),
^
jni/libc/bionic/malloc_debug_common.cpp:51:27: error: 'je_malloc_usable_size' was not declared in this scope
#define Malloc(function) je_ ## function
^
jni/libc/bionic/malloc_debug_common.cpp:71:3: note: in expansion of macro 'Malloc'
Malloc(malloc_usable_size),
^
jni/libc/bionic/malloc_debug_common.cpp:51:27: error: 'je_posix_memalign' was not declared in this scope
#define Malloc(function) je_ ## function
^
jni/libc/bionic/malloc_debug_common.cpp:73:3: note: in expansion of macro 'Malloc'
Malloc(posix_memalign),
^
jni/libc/bionic/malloc_debug_common.cpp:51:27: error: 'je_realloc' was not declared in this scope
#define Malloc(function) je_ ## function
^
jni/libc/bionic/malloc_debug_common.cpp:77:3: note: in expansion of macro 'Malloc'
Malloc(realloc),
^
jni/libc/bionic/malloc_debug_common.cpp:51:27: error: 'je_valloc' was not declared in this scope
#define Malloc(function) je_ ## function
^
jni/libc/bionic/malloc_debug_common.cpp:79:3: note: in expansion of macro 'Malloc'
Malloc(valloc),
^
jni/libc/bionic/malloc_debug_common.cpp: In function 'void get_malloc_leak_info(uint8_t**, size_t*, size_t*, size_t*, size_t*)':
jni/libc/bionic/malloc_debug_common.cpp:191:96: error: 'je_malloc' was not declared in this scope
HashEntry** list = static_cast<HashEntry**>(Malloc(malloc)(sizeof(void*) * g_hash_table.count));
^
jni/libc/bionic/malloc_debug_common.cpp:214:22: error: 'je_free' was not declared in this scope
Malloc(free)(list);
^
jni/libc/bionic/malloc_debug_common.cpp:236:20: error: 'je_free' was not declared in this scope
Malloc(free)(list);
^
jni/libc/bionic/malloc_debug_common.cpp: In function 'void free_malloc_leak_info(uint8_t*)':
jni/libc/bionic/malloc_debug_common.cpp:240:20: error: 'je_free' was not declared in this scope
Malloc(free)(info);
^
jni/libc/bionic/malloc_debug_common.cpp: In function 'size_t malloc_usable_size(const void*)':
jni/libc/bionic/malloc_debug_common.cpp:262:53: error: declaration of C function 'size_t malloc_usable_size(const void*)' conflicts with
extern "C" size_t malloc_usable_size(const void* mem) {
^
In file included from jni/libc/bionic/jemalloc.h:20:0,
from jni/libc/bionic/malloc_debug_common.cpp:50:
jni/libc/jemalloc/jemalloc.h:70:33: error: previous declaration 'size_t malloc_usable_size(void*)' here
# define je_malloc_usable_size malloc_usable_size
^
jni/libc/jemalloc/jemalloc.h:230:41: note: in expansion of macro 'je_malloc_usable_size'
JEMALLOC_EXPORT size_t JEMALLOC_NOTHROW je_malloc_usable_size(
^
make: *** [obj/local/armeabi-v7a/objs/c/bionic/malloc_debug_common.o] Error 1
How to fix it?
Thanks!

Answer 1

I tried to use libc instead from the bionic repository in github.
It appears that you've copied Bionic libc into your project, and are trying to build it.
Don't. A prebuilt copy is already provided to you as part of the ndk, and you don't need to do anything special to use it: the ndk-provided compiler will do that automatically.
You should concentrate on building your application, not copying random libc variants and trying to build them.