makefile“没有规则可以成为目标"错误 [英] makefile "no rule to make a target" error

问题描述

我已经研究这个问题一段时间了，但仍然不知道出什么问题.

I have been looking at this problem for a while and still don't know what is wrong.

我的makefile如下:

My makefile looks like:

    F90    = pgf90
NETCDF_DIR = /opt/netcdf

LBS             = -L$(NETCDF_DIR)/lib -lnetcdff -lnetcdf
INCLUDE_MODULES = -I$(NETCDF_DIR)/include

EXEC = CNG_WRFCHEM_EMI
OBJS = module_CNG_WRFCHEM_EMI_lib.o \
       CNG_WRFCHEM_EMI.o

${EXEC} : ${OBJS}
        ${F90} -o $@ ${OBJS} ${LIBS}

.f90.o:
        ${F90} -c ${INCLUDE_MODULES} $<

clean:
        rm -f ${EXEC} ${OBJS} *.mod

错误消息是:

 make: *** No rule to make target `module_CNG_WRFCHEM_EMI_lib.o', needed by `CNG_WRFCHEM_EMI'.  Stop.

所有文件都与图片所示在同一目录中

All the files are in the same directory as the picture shows:

谢谢

推荐答案

Make不知道.f90是后缀，因此您的后缀规则无效.如果make不知道后缀规则，仅声明后缀规则是不够的.如果要使用后缀规则，还必须添加带有.SUFFIXES伪目标的新后缀，如下所示:

Make doesn't know that .f90 is a suffix, so your suffix rule is not valid. It's not enough to just declare a suffix rule if make doesn't know about the suffix. If you want to use suffix rules, you also have to add the new suffix with the .SUFFIXES pseudo-target, like this:

.SUFFIXES: .f90

或者您可以使用不需要的模式规则(但特定于GNU make):

Or you can use pattern rules, which don't require this (but are GNU make-specific):

%.o : %.f90
        ${F90} -c ${INCLUDE_MODULES} $<

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