[英]clang: error: linker command failed with exit code 1 (use -v to see invocation) console app
[英]clang++: error: linker command failed with exit code 1 (use -v to see invocation) in cpp with ffmpeg
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
我的 jni 文件夾:
Android.mk 文件
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_C_INCLUDES += ./include
LOCAL_MODULE := native-lib
LOCAL_CFLAGS := -DSTDC_HEADERS -std=c99
LOCAL_CFLAGS := -Wno-pointer-sign
LOCAL_ARM_MODE := arm
APP_OPTIM := release
LOCAL_SRC_FILES := \
./native-lib.cpp
LOCAL_LDLIBS := -llog
include $(BUILD_SHARED_LIBRARY)
本機 lib.cpp 文件
#include <jni.h>
#include <string>
extern "C"
{
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libavutil/opt.h"
}
extern "C" JNIEXPORT jstring JNICALL
Java_com_example_m_MainActivity_stringFromJNI(
JNIEnv* env,
jobject /* this */) {
std::string hello = "Hello from C++";
av_register_all();
return env->NewStringUTF(hello.c_str());
}
當我構建 ndk 時,會發生此錯誤。
D:\Github\n>ndk-build
Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-16.
[arm64-v8a] Compile++ : native-lib <= native-lib.cpp
[arm64-v8a] SharedLibrary : libnative-lib.so
./obj/local/arm64-v8a/objs/native-lib/./libmp3lame/native-lib.o: In function `Java_com_example_m_MainActivity_stringFromJNI':
D:\Github\n/jni/./libmp3lame/native-lib.cpp:16: undefined reference to `av_register_all'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [D:/install/sdk/ndk/21.0.6113669/build//../build/core/build-binary.mk:725: obj/local/arm64-v8a/libnative-lib.so] Error 1
D:\Github\n>ndk-build -v
GNU Make 4.2.1
Built for x86_64-w64-mingw32
Copyright (C) 1988-2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
D:\Github\n>
為什么它像這樣native-lib.cpp:16: undefined reference av_register_all
?
我在我的 jni 文件夾中添加了所有必需的庫,但是為什么會出現這個錯誤和這個native-lib.cpp:16: undefined reference av_register_all
呢? 我該如何解決這個問題?
我在我的 jni 文件夾中添加了所有必需的庫,但是為什么會出現這個錯誤和這個 native-lib.cpp:16: undefined reference av_register_all 呢?
僅僅將庫放到你的項目中是不夠的。 Android.mk 中沒有任何鏈接指令。 因此,即使您的庫在那里,當您的 native-lib 被編譯時,它也不會被鏈接。 因此,您未定義的引用...
我建議你看看這篇文章,重點關注那些LOCAL_C_INCLUDES
和LOCAL_LDLIBS
變量。 你必須在你的項目中做類似的事情。
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