AdiAtAnd AdiAtAnd - 3 months ago 27
C Question

jni/Android.mk:8:curlLib/packages/Android/Android.mk: No such file or directory

I have never built curl with Android.

Pre-requisites : I am using Android Studio 2.1.2
I am using NDK , non-experimental way
I have Source code of the curl-7.49.1 library inside my jni folder in curlLib directory
ExtLibCurl is folder/directory inside my application jni folder, which has source code downloaded from
https://android.googlesource.com/platform/external/curl/+/e6f2b03027b5feb92b30f5d47801ec3fabe9fd95

Can check Android.mk for cURL and other files there.

Updating the files according to the comments in the question.

Following is my Android.mk file

JNI_DIR := $(call my-dir)

LOCAL_PATH:= $(JNI_DIR)
include $(CLEAR_VARS)

include $(LOCAL_PATH)/ExtLibCurl/Android.mk

# Build main library as shared library.
LOCAL_PATH := $(JNI_DIR)
include $(CLEAR_VARS)

LOCAL_C_INCLUDES := $(LOCAL_PATH)
LOCAL_C_INCLUDES += $(LOCAL_PATH)/ExtLibCurl/include/curl
LOCAL_C_INCLUDES += $(LOCAL_PATH)/ExtLibCurl/lib

FILE_LIST += $(wildcard $(LOCAL_PATH)/ExtLibCurl/src/*.c)

LOCAL_MODULE := ndksampleapp
LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)

LOCAL_STATIC_LIBRARIES := ExtLibCurl

include $(BUILD_SHARED_LIBRARY)


Application.mk

APP_ABI := all
APP_STL := gnustl_static
APP_CFLAGS += -std=gnu++11
APP_OPTIM := debug
LOCAL_CPP_FEATURES += exceptions

NDK_TOOLCHAIN_VERSION := 4.9


Is my way of building curl's Android.mk is correct?

when I do ndk-build in src\main path I am getting following error

[arm64-v8a] Compile : ndksampleapp <= curlutil.c
cc1.exe: warning: command line option '-std=gnu++11' is valid for C++/ObjC++ but not for C
In file included from jni/ExtLibCurl/lib/strdup.h:24:0,
from jni/ExtLibCurl/src/setup.h:206,
from jni/ExtLibCurl/src/curlutil.c:23:
jni/ExtLibCurl/lib/setup.h:120:28: fatal error: curl/curlbuild.h: No such file or directory
#include <curl/curlbuild.h>
^
compilation terminated.
make: *** [obj/local/arm64-v8a/objs-debug/ndksampleapp/ExtLibCurl/src/curlutil.o] Error 1


If I remove FILE_LIST += $(wildcard $(LOCAL_PATH)/ExtLibCurl/src/*.c) no cURL files are getting build.

Answer

yours Android.mk file should look like this:

JNI_DIR := $(call my-dir)

LOCAL_PATH:= $(JNI_DIR)
include $(CLEAR_VARS)

include $(LOCAL_PATH)/ExtLibCurl/Android.mk

# Build main library as shared library.
LOCAL_PATH := $(JNI_DIR)
include $(CLEAR_VARS)

LOCAL_C_INCLUDES += $(LOCAL_PATH)/ExtLibCurl/include
LOCAL_C_INCLUDES += $(LOCAL_PATH)/ExtLibCurl/lib

# !!! place list of YOUR sources to this variable !!!
FILE_LIST += $(wildcard $(LOCAL_PATH)/src/*.c) 

LOCAL_MODULE := ndksampleapp
LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)

LOCAL_STATIC_LIBRARIES := libcurl
LOCAL_LDLIBS += -lz

include $(BUILD_SHARED_LIBRARY)

name of the module don't need to match its directory name.

From ExtLibCurl/Android.mk you must uncomment the BUILD_STATIC_LIBRARY part, and you can also remove all part with creating executable curl (lines 74+), that is the file will looks like this:

# Google Android makefile for curl and libcurl
#
# Place the curl source (including this makefile) into external/curl/ in the
# Android source tree.  Then build them with 'make curl' or just 'make libcurl'
# from the Android root. Tested with Android 1.5
#
# Note: you must first create a curl_config.h file by running configure in the
# Android environment. The only way I've found to do this is tricky. Perform a
# normal Android build with libcurl in the source tree, providing the target
# "showcommands" to make. The build will eventually fail (because curl_config.h
# doesn't exist yet), but the compiler commands used to build curl will be
# shown. Now, from the external/curl/ directory, run curl's normal configure
# command with flags that match what Android itself uses. This will mean
# putting the compiler directory into the PATH, putting the -I, -isystem and
# -D options into CPPFLAGS, putting the -m, -f, -O and -nostdlib options into
# CFLAGS, and putting the -Wl, -L and -l options into LIBS, along with the path
# to the files libgcc.a, crtbegin_dynamic.o, and ccrtend_android.o. Remember
# that the paths must be absolute since you will not be running configure from
# the same directory as the Android make.  The normal cross-compiler options
# must also be set.
#
# The end result will be a configure command that looks something like this
# (the environment variable A is set to the Android root path):
#
#  A=`realpath ../..` && \
#  PATH="$A/prebuilt/linux-x86/toolchain/arm-eabi-X/bin:$PATH" \
#  ./configure --host=arm-linux CC=arm-eabi-gcc \
#  CPPFLAGS="-I $A/system/core/include ..." \
#  CFLAGS="-fno-exceptions -Wno-multichar ..." \
#  LIB="$A/prebuilt/linux-x86/toolchain/arm-eabi-X/lib/gcc/arm-eabi/X\
#  /interwork/libgcc.a ..." \
#
# Dan Fandrich
# September 2009
LOCAL_PATH:= $(call my-dir)
common_CFLAGS := -Wpointer-arith -Wwrite-strings -Wunused -Winline -Wnested-externs -Wmissing-declarations -Wmissing-prototypes -Wno-long-long -Wfloat-equal -Wno-multichar -Wsign-compare -Wno-format-nonliteral -Wendif-labels -Wstrict-prototypes -Wdeclaration-after-statement -Wno-system-headers -DHAVE_CONFIG_H
#########################
# Build the libcurl library
include $(CLEAR_VARS)
include $(LOCAL_PATH)/lib/Makefile.inc
CURL_HEADERS := \
    curlbuild.h \
    curl.h \
    curlrules.h \
    curlver.h \
    easy.h \
    mprintf.h \
    multi.h \
    stdcheaders.h \
    typecheck-gcc.h \
    types.h
LOCAL_SRC_FILES := $(addprefix lib/,$(CSOURCES))
LOCAL_C_INCLUDES := \
    $(LOCAL_PATH)/include \
    external/openssl/include \
    external/zlib
LOCAL_CFLAGS += $(common_CFLAGS)
LOCAL_COPY_HEADERS_TO := libcurl/curl
LOCAL_COPY_HEADERS := $(addprefix include/curl/,$(CURL_HEADERS))
#LOCAL_SHARED_LIBRARIES := libz
LOCAL_MODULE:= libcurl
include $(BUILD_STATIC_LIBRARY)