JNI共享库中未定义符号，可执行文件正在工作

Question

以下是不同的Makefile：

libcds/src：

CPP=g++

CPPFLAGS=-O9 -w -DNDEBUG 

INCL=-I../includes/

CODERS_DIR=coders
CODERS_OBJECTS=$(CODERS_DIR)/huff.o $(CODERS_DIR)/huffman_codes.o

STATIC_PERMUTATION_DIR=static_permutation
STATIC_PERMUTATION_OBJECTS=$(STATIC_PERMUTATION_DIR)/perm.o ...

STATIC_BITSEQUENCE_DIR=static_bitsequence
STATIC_BITSEQUENCE_OBJECTS=$(STATIC_BITSEQUENCE_DIR)/static_bitsequence.o ..

STATIC_SEQUENCE_DIR=static_sequence
STATIC_SEQUENCE_OBJECTS=$(STATIC_SEQUENCE_DIR)/static_sequence.o, ..., wt_coder.o

UTILS_DIR=utils
UTILS_OBJECTS=$(UTILS_DIR)/alphabet_mapper_none.o $(UTILS_DIR)/alphabet_mapper.o

%.o: %.cpp

$(CPP) $(CPPFLAGS) $(INCL) -c $< -o $@

all: lib 

lib: pre $(CODERS_OBJECTS) $(STATIC_BITSEQUENCE_OBJECTS) $(STATIC_SEQUENCE_OBJECTS) $(UTILS_OBJECTS) $(STATIC_PERMUTATION_OBJECTS)
    ar rcs ../lib/libcds.a $(CODERS_OBJECTS) $(STATIC_BITSEQUENCE_OBJECTS) $(STATIC_SEQUENCE_OBJECTS) $(UTILS_OBJECTS) $(STATIC_PERMUTATION_OBJECTS)

pre:
    cp basics.h ../includes/
    cp */*.h ../includes/

SSA2:

CC=g++

CFLAGS=-w -O9 -DNDEBUG -I../libcds/includes/
CODERS_DIR=../libcds/src/coders

CODERS_OBJECTS=$(CODERS_DIR)/huff.o $(CODERS_DIR)/huffman_codes.o

STATIC_BITSEQUENCE_DIR=../libcds/src/static_bitsequence

STATIC_BITSEQUENCE_OBJECTS=$(STATIC_BITSEQUENCE_DIR)/static_bitsequence.o ...

STATIC_SEQUENCE_DIR=../libcds/src/static_sequence

STATIC_SEQUENCE_OBJECTS=$(STATIC_SEQUENCE_DIR)/static_sequence.o ...

UTILS_DIR=../libcds/src/utils

UTILS_OBJECTS=$(UTILS_DIR)/alphabet_mapper_none.o $(UTILS_DIR)/alphabet_mapper.o

all: index

# pattern rule for all objects files

%.o: %.c *.h

    $(CC) -c $(CFLAGS) $< -o $@

%.o: %.cpp *.h

    $(CC) -c $(CFLAGS) $< -o $@

index: bitrankw32int.o bitarray.o  ds/ds.o ds/globals.o ds/helped.o ds/shallow.o ds/deep2.o ds/blind2.o SSA.o

    cp ../libcds/lib/libcds.a SSA.a

    ar rcs SSA.a SSA.o bitrankw32int.o bitarray.o ds/ds.o ds/globals.o ds/shallow.o ds/helped.o ds/deep2.o ds/blind2.o

CC=g++ -I $(JAVA_HOME)/include -I $(JAVA_HOME)/include/linux
LD_LIBRARY_PATH=./
JNI_NAME= indexlib

all: test

%.o: %.c *.h
    $(CC) -c $(CFLAGS) $< -o $@

test_index: 
    $(CC) run_queries.c -o testIndex SSA.a

test_index_lib: run_queries.o
    ld -shared -soname lib$(JNI_NAME).so -o lib$(JNI_NAME).so run_queries.o SSA.a -lc

(std::basic_ostream>&,char const*,int）U std::__throw_bad_cast()
U std::cout

所以实际上这可能与链接器错误有关：未定义对`std::ctype ::_m_widen_init()的引用

Answer 1

我认为您没有链接到C++标准库。您需要它是因为您链接到的库之一是C++。

在第一种情况下(target test_index)，一切正常，因为您正在使用g++进行编译和链接，并且它将隐式链接到libstdc++。在共享库的情况下，您使用ld链接，它不会隐式链接libstdc++。

您可以使用g++编译和链接共享库，或者显式地使用-lstdc++添加libstdc++。两者都应该有效。