对..错误的奇怪未定义引用

#include<stdio.h>
#include \"fixmath.h\"
int main()
{
    float num1=6.25f;
    float num2=2.567f;

    fix16_t numfix1=fix16_from_float(num1);
    fix16_t numfix2=fix16_from_float(num2);

    //try out arithmetic on the fixed numbers

    fix16_t simpleAdd= fix16_add(numfix1, numfix2);//(this works !!)no error 

    fix16_t product= fix16_smul(numfix1,numfix2);//undefined reference to \'fix16_smul\'
    fix16_t quotient=fix16_sdiv(numfix1,numfix2);//undefined reference to \'fix16_sdiv\'
    fix16_t sum=fix16_sadd(numfix1,numfix2);//undefined reference to \'fix16_sadd\'
    fix16_t difference=fix16_ssub(numfix1,numfix2);//undefined reference to ....

    //print out the results
    printf(\"the product of %f * %f =%f \\n\",num1,num2,fix16_to_float(product));
    printf(\"the quotient of %f and %f =%f \\n\",num1,num2,fix16_to_float(quotient));
    printf(\"the sum of %f + %f =%f \\n\",num1,num2,fix16_to_float(sum));
    printf(\"the difference of %f - %f =%f \\n\",num1,num2,fix16_to_float(difference));

    //system(\"pause\")
    printf(\"please press any key to continue ...\\n\");
    getchar();

}

//build log
Project   : libfixmath
Compiler  : GNU GCC Compiler (called directly)
Directory : C:\\libfixmath\\
--------------------------------------------------------------------------------
Switching to target: dbg
Linking console executable: fixmathexample.exe
obj\\dbg\\main.o: In function `main\':
C:/libfixmath/main.c:14: undefined reference to `fix16_smul\'
C:/libfixmath/main.c:15: undefined reference to `fix16_sdiv\'
C:/libfixmath/main.c:16: undefined reference to `fix16_sadd\'
obj\\dbg\\main.o: In function `fix16_ssub\':
C:/libfixmath/fix16.h:51: undefined reference to `fix16_sadd\'
collect2: ld returned 1 exit status
Process terminated with status 1 (0 minutes, 0 seconds)
4 errors, 0 warnings

###############################################################################
# Makefile automatically generated by Code::Blocks IDE                        #
###############################################################################

# Project:          libfixmath
# Project filename: C:\\libfixmath\\libfixmath.cbp
# Compiler used:    GNU GCC Compiler

### Variables used in this Makefile
dbg_CC=mingw32-gcc.exe
dbg_CPP=mingw32-g++.exe
dbg_LD=mingw32-g++.exe
dbg_LIB=ar.exe
dbg_RESCOMP=windres.exe
rel_CC=mingw32-gcc.exe
rel_CPP=mingw32-g++.exe
rel_LD=mingw32-g++.exe
rel_LIB=ar.exe
rel_RESCOMP=windres.exe

### Compiler/linker options
dbg_GLOBAL_CFLAGS=
dbg_PROJECT_CFLAGS= -DFIXMATH_NO_CACHE -DFIXMATH_NO_64BIT
dbg_GLOBAL_LDFLAGS=
dbg_PROJECT_LDFLAGS=
dbg_GLOBAL_INCS= -IC:/Program\\ Files/CodeBlocks/include
dbg_PROJECT_INCS=
dbg_GLOBAL_LIBDIRS= -LC:/Program\\ Files/CodeBlocks/lib
dbg_PROJECT_LIBDIRS= -LC:/libfixmath/lib
dbg_GLOBAL_LIBS=
dbg_PROJECT_LIBS= C:\\libfixmath\\lib\\libfixmath.a
rel_GLOBAL_CFLAGS=
rel_PROJECT_CFLAGS= -DFIXMATH_NO_CACHE -DFIXMATH_NO_64BIT
rel_GLOBAL_LDFLAGS=
rel_PROJECT_LDFLAGS=
rel_GLOBAL_INCS= -IC:/Program\\ Files/CodeBlocks/include
rel_PROJECT_INCS=
rel_GLOBAL_LIBDIRS= -LC:/Program\\ Files/CodeBlocks/lib
rel_PROJECT_LIBDIRS= -LC:/libfixmath/lib
rel_GLOBAL_LIBS=
rel_PROJECT_LIBS= C:\\libfixmath\\lib\\libfixmath.a

### Targets compiler flags
dbg_CFLAGS= $(dbg_PROJECT_CFLAGS) -Wall -g $(dbg_GLOBAL_CFLAGS)
rel_CFLAGS= $(rel_PROJECT_CFLAGS) -fexpensive-optimizations -O3 -Wall -fomit-frame-pointer $(rel_GLOBAL_CFLAGS)

### Targets linker flags
dbg_LDFLAGS= $(dbg_PROJECT_LDFLAGS) $(dbg_GLOBAL_LDFLAGS)
rel_LDFLAGS= $(rel_PROJECT_LDFLAGS) -s $(rel_GLOBAL_LDFLAGS)

### Targets include directories
dbg_INCS= $(dbg_PROJECT_INCS) $(dbg_GLOBAL_INCS)
rel_INCS= $(rel_PROJECT_INCS) $(rel_GLOBAL_INCS)

### Targets library directories
dbg_LIBDIRS= $(dbg_PROJECT_LIBDIRS) $(dbg_GLOBAL_LIBDIRS)
rel_LIBDIRS= $(rel_PROJECT_LIBDIRS) $(rel_GLOBAL_LIBDIRS)

### Targets libraries
dbg_LIBS= $(dbg_PROJECT_LIBS) $(dbg_GLOBAL_LIBS)
rel_LIBS= $(rel_PROJECT_LIBS) $(rel_GLOBAL_LIBS)

###############################################################################
#         You shouldn\'t need to modify anything beyond this point             #
###############################################################################

### Resources used in this Makefile
dbg_RESOURCE=

### Objects used in this Makefile
dbg_OBJS=obj/dbg/main.o 
dbg_LINKOBJS=$(dbg_OBJS)
dbg_DEPS=.deps/main.d 
rel_OBJS=obj/rel/main.o 
rel_LINKOBJS=$(rel_OBJS)
rel_DEPS=.deps/main.d 

### The targets of this project
dbg_BIN=fixmathexample.exe
rel_BIN=fixmathexample

.PHONY: all all-before all-custom all-after clean clean-custom distclean distclean-custom depend_dbg dbg-before dbg-after depend_rel rel-before rel-after 

all: all-before dbg rel all-after


dist:
    @zip libfixmath.cbp.zip libfixmath.cbp Makefile Makefile fix16.c fix16.h fix16_exp.c fix16_sqrt.c fix16_trig.c fixmath.h fract32.c fract32.h int64.h main.c uint32.c uint32.h 

clean_dbg:
    @echo Cleaning target \"dbg\"...
    @$(RM) $(dbg_BIN) $(dbg_OBJS) $(dbg_RESOURCE) 

distclean_dbg:
    @echo Dist-cleaning target \"dbg\"...
    @$(RM) $(dbg_BIN) $(dbg_OBJS) $(dbg_DEPS) $(dbg_RESOURCE) 

clean_rel:
    @echo Cleaning target \"rel\"...
    @$(RM) $(rel_BIN) $(rel_OBJS) $(rel_RESOURCE) 

distclean_rel:
    @echo Dist-cleaning target \"rel\"...
    @$(RM) $(rel_BIN) $(rel_OBJS) $(rel_DEPS) $(rel_RESOURCE) 

clean: clean_dbg clean_rel 

distclean: distclean_dbg distclean_rel 

depend_dbg_DIRS:
    -@if not exist \".deps\\.\" mkdir \".deps\"

depend_dbg: depend_dbg_DIRS $(dbg_DEPS)

depend_rel_DIRS:
    -@if not exist \".deps\\.\" mkdir \".deps\"

depend_rel: depend_rel_DIRS $(rel_DEPS)

depend: depend_dbg depend_rel

dbg_DIRS:
    -@if not exist \"obj\\.\" mkdir \"obj\"
    -@if not exist \"obj\\dbg\\.\" mkdir \"obj\\dbg\"

dbg: depend_dbg dbg_DIRS dbg-before $(dbg_BIN) dbg-after

$(dbg_BIN): $(dbg_LINKOBJS) $(dbg_RESOURCE)
    @echo Linking executable \"fixmathexample.exe\"...
    @$(dbg_LD) $(dbg_LIBDIRS) -o $(dbg_BIN) $(dbg_LINKOBJS) $(dbg_RESOURCE) $(dbg_LDFLAGS) $(dbg_LIBS)

rel_DIRS:
    -@if not exist \"obj\\.\" mkdir \"obj\"
    -@if not exist \"obj\\rel\\.\" mkdir \"obj\\rel\"

rel: depend_rel rel_DIRS rel-before $(rel_BIN) rel-after

$(rel_BIN): $(rel_LINKOBJS) $(rel_RESOURCE)
    @echo Linking executable \"fixmathexample\"...
    @$(rel_LD) $(rel_LIBDIRS) -o $(rel_BIN) $(rel_LINKOBJS) $(rel_RESOURCE) $(rel_LDFLAGS) $(rel_LIBS)


.deps/main.d: main.c
    @echo Calculating dependencies for \"main.c\"...
    @$(dbg_CC) -MM $(dbg_CFLAGS) -MF .deps/main.d -MT obj/dbg/main.o,obj/rel/main.o $(dbg_INCS) main.c

obj/dbg/main.o: .deps/main.d
    @echo Compiling \"main.c\"...
    @$(dbg_CC) $(dbg_CFLAGS) $(dbg_INCS) -c main.c -o obj/dbg/main.o


obj/rel/main.o: main.c
    @echo Compiling \"main.c\"...
    @$(rel_CC) $(rel_CFLAGS) $(rel_INCS) -c main.c -o obj/rel/main.o