使用 Makefile 编译失败但在命令行中成功

compilation with Makefile fail but success in command line

我使用 Makefile 来编译我的项目并编译成功,但是当我向 linker (-lbcm2835) 添加一个新的库 (libbcm2835.a) 时它失败了,否则当使用按照它编译的命令和 link 没有错误:

gcc -c ihome_*.c
gcc -o iHome_Start ihome*.o -lbcm2835 -lpthread

生成文件:

# project name (generate executable with this name)
TARGET   = iHome_Start

CC       = gcc
# compiling flags here
CFLAGS   = -std=c99 -Wall -I.

LINKER   = gcc -o
# linking flags here
LFLAGS   = -lpthread -lbcm2835

# change these to set the proper directories where each files shoould be
SRCDIR   = .
OBJDIR   = .
BINDIR   = .

SOURCES  := $(wildcard $(SRCDIR)/*.c)
INCLUDES := $(wildcard $(SRCDIR)/*.h)
OBJECTS  := $(SOURCES:$(SRCDIR)/%.c=$(OBJDIR)/%.o)
rm       = rm -f


$(BINDIR)/$(TARGET): $(OBJECTS)
    @$(LINKER) $@ $(LFLAGS) $(OBJECTS)
    @echo "Linking complete!"

$(OBJECTS): $(OBJDIR)/%.o : $(SRCDIR)/%.c
    @$(CC) $(CFLAGS) -c $< -o $@
    @echo "Compiled "$<" successfully!"

.PHONEY: clean
clean:
    @$(rm) $(OBJECTS)
    @echo "Cleanup complete!"

.PHONEY: remove
remove: clean
    @$(rm) $(BINDIR)/$(TARGET)
    @echo "Executable removed!"

问题出在

@$(LINKER) $@ $(LFLAGS) $(OBJECTS)

链接器按照参数出现的顺序处理参数。当它看到库时,它还没有看到任何目标文件,因此没有未解析的符号,因此它不会从库中提取任何内容。交换 $(OBJECTS)$(LFLAGS)

@$(LINKER) $@ $(OBJECTS) $(LFLAGS)

我还建议将 LFLAGS 重命名为 LIBRARIES