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.a .so .a-->.so編譯

測試代碼

hello.c hello.h

makefile:

CFLAGS = -g -O2  -Wall -Werror -Wno-unused -fPIC

CXXFLAGS = -fPIC -shared

hello.o:hello.c hello.h

gcc -c $(CFLAGS) $(CXXFLAGS) hello.c

libhello.so:hello.o

ar cr libhello.a hello.o

staticlib:hello.o

ar cr libhello.a hello.o

dynamic:hello.o

gcc hello.o $(CXXFLAGS) -o libhello.so

all:libhello.so

echo "compile start..."

gcc -fPIC -shared -o libhello.so hello.h -Wl,--whole-archive libhello.a -Wl,--no-whole-archive

clean:

rm *.o *.a

靜态庫:

ar cr libhello.a hello.o

動态庫:

gcc hello.o $(CXXFLAGS) -o libhello.so

靜态->動态

gcc -fPIC -shared -o libhello.so hello.h -Wl,--whole-archive libhello.a -Wl,--no-whole-archive

注意:

在将靜态庫轉為動态庫的過程中,一定要保證在編譯靜态庫的時候加上了 -fpic編譯選項,不然會出現

‘/usr/bin/ld: libhello.a(hello.o): relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC

libhello.a(hello.o): error adding symbols: Bad value collect2: error: ld returned 1 exit status‘ 錯誤資訊。

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