在深度嵌套的源/ makefile中正确包含(POSIX)库

简而言之:我们有一个大型SDK,其中包含由Elbonian Code Slaves共同攻击的~1Gb多毛的代码,由一个颤抖的RPC格式,共享内存,互斥/信号量和吐痰捆绑在一起.它是在Linux机器上编译的,用于嵌入式SoC目标.

作为改进部分代码的一部分,我想将POSIX信号量添加到其中一个源中,这些源包含在一些RPC例程中.

但是,只需编写一些有效的代码并坚持下去

#include 

在顶部当然不足以启用编译.

所需要的是makefile中的特殊标志,具体取决于您所读取的内容可能是以下任何/全部:

-pthread
-lpthread
-lpthreads
-lrt
-rt

我没有很多编写makefile的经验,不幸的是由于代码库的大小,它们有多个嵌套级别(SDK中超过2,000个makefile),具有各种依赖关系,所有这些都来自One True Makefile在根文件夹中.

makefile中有很多macroification(TM)正在进行,这无助于我解开正确的咒语.

作为项目结构和我试图修改的文件的一瞥,文件夹结构类似于:

/home/project/kernel/... Contains the Linux kernel & PSP / BSP
/home/project/the_system/... Contains the software suite we're building

我们正在查看的文件位于:

/home/project/the_system/core_app/interface/src/messaging.c

其中包括5个其他来源,例如:

/home/project/the_system/core_app/interface/src/sys-control.c
/home/project/the_system/core_app/interface/src/file-control.c
/home/project/the_system/core_app/interface/src/audio-control.c

......你明白了.这些中的每一个都可能被其他希望彼此通信的进程包含/调用我是否提到这一切都很可怕？

该链中的每个文件夹中都有makefile,本地文件夹中的makefile

/home/project/the_system/core_app/interface/src/Makefile

是这样的(为清楚起见,我删除了一些位,忽略了未引用的对象):

    INCLUDES += -I./ -I$(PUBLIC_INCLUDE_DIR) -I$(LINUXKERNEL_INSTALL_DIR)/include -I$(CMEM_INSTALL_DIR)/packages/ti/sdo/linuxutils/cmem/include -lpthreads

    C_FLAGS += -Wall -g -O3
    AR_FLAGS += -r

    CC = $(MVTOOL_PREFIX)gcc $(INCLUDES) $(C_FLAGS) -c
    AR = $(MVTOOL_PREFIX)ar

    REL_EXE1 = reboot_me

    REL_LIB1 = file-control.a

    REL_LIB3 = share_mem.a

    REL_LIB4 = sys-control.a

    REL_LIB5 = msg_util.a

    REL_LIB9 = messaging.a

    REL_LIB10 = sysctrl.a

    REL_LIB11 = audio-control.a

    REL_OBJ1 = file-control.o share_mem.o msg_util.o

    REL_OBJ3 = share_mem.o

    REL_OBJ4 = sys-control.o share_mem.o msg_util.o

    REL_OBJ5 = msg_util.o

    REL_OBJ9 = messaging.o

    REL_OBJ10 = sysctrl.o sys-control.o share_mem.o msg_util.o messaging.o audio-control.o

    REL_OBJ11 = audio-control.o messaging.o share_mem.o msg_util.o


    all:  $(REL_EXE1) $(REL_LIB9) $(REL_LIB12) $(REL_LIB3) $(REL_LIB1) $(REL_LIB2) $(REL_LIB4) $(REL_LIB5) $(REL_LIB6) $(REL_LIB7) $(REL_LIB8) $(REL_LIB10) $(REL_LIB11) install

    $(REL_LIB1): $(REL_OBJ1)
        $(AR) $(AR_FLAGS) $(REL_LIB1) $(REL_OBJ1)

    $(REL_LIB2): $(REL_OBJ2)
        $(AR) $(AR_FLAGS) $(REL_LIB2) $(REL_OBJ2)

    $(REL_LIB3): $(REL_OBJ3)
        $(AR) $(AR_FLAGS) $(REL_LIB3) $(REL_OBJ3)

    $(REL_LIB4): $(REL_OBJ4)
        $(AR) $(AR_FLAGS) $(REL_LIB4) $(REL_OBJ4)

    $(REL_LIB5): $(REL_OBJ5)
        $(AR) $(AR_FLAGS) $(REL_LIB5) $(REL_OBJ5)

    $(REL_LIB7): $(REL_OBJ7) 
        $(AR) $(AR_FLAGS) $(REL_LIB7) $(REL_OBJ7)

    $(REL_LIB8): $(REL_OBJ8) 
        $(AR) $(AR_FLAGS) $(REL_LIB8) $(REL_OBJ8)

    $(REL_LIB9): $(REL_OBJ9) 
        $(AR) $(AR_FLAGS) $(REL_LIB9) $(REL_OBJ9)

    $(REL_LIB10): $(REL_OBJ10) 
        $(AR) $(AR_FLAGS) $(REL_LIB10) $(REL_OBJ10)

    $(REL_LIB11): $(REL_OBJ11) 
        $(AR) $(AR_FLAGS) $(REL_LIB11) $(REL_OBJ11)

    $(REL_LIB12): $(REL_OBJ12) 
        $(AR) $(AR_FLAGS) $(REL_LIB12) $(REL_OBJ12)


    file-control.o : file-control.c $(PUBLIC_INCLUDE_DIR)/file-control.h $(PUBLIC_INCLUDE_DIR)/Msg_Def.h\
            $(PUBLIC_INCLUDE_DIR)/sys_env_type.h
        $(CC) $(C_FLAGS) -o $@ $<

    audio-control.o : audio-control.c $(PUBLIC_INCLUDE_DIR)/audio-control.h \
            $(PUBLIC_INCLUDE_DIR)/Msg_Def.h $(PUBLIC_INCLUDE_DIR)/sys_env_type.h
        $(CC) $(C_FLAGS) -o $@ $<

    share_mem.o: share_mem.c $(PUBLIC_INCLUDE_DIR)/share_mem.h
        $(CC) $(C_FLAGS) -o $@ $<

    sys-control.o : sys-control.c $(PUBLIC_INCLUDE_DIR)/sys-control.h $(PUBLIC_INCLUDE_DIR)/Msg_Def.h\
            $(PUBLIC_INCLUDE_DIR)/sys_env_type.h $(PUBLIC_INCLUDE_DIR)/share_mem.h
        $(CC) $(C_FLAGS) -o $@ $<

    msg_util.o: msg_util.c $(PUBLIC_INCLUDE_DIR)/Msg_Def.h
        $(CC) $(C_FLAGS) -o $@ $<

    messaging.o: messaging.c $(PUBLIC_INCLUDE_DIR)/messaging.h
        $(CC) $(C_FLAGS) -o $@ $<

    sysctrl.o: sysctrl.c $(PUBLIC_INCLUDE_DIR)/sysctrl.h $(PUBLIC_INCLUDE_DIR)/sys_env_type.h
        $(CC) $(C_FLAGS) -o $@ $<

    reboot_me: 
        $(MVTOOL_PREFIX)gcc -g -Wall -static  -c -o reboot_me.o reboot_me.c
        $(MVTOOL_PREFIX)gcc -o reboot_me reboot_me.o    

    clean:
        -$(RM) -f *.o
        -$(RM) -f *.a
        -$(RM) -f $(REL_EXE1)
        -$(RM) -Rf $(APP_LIB_DIR)

    install: $(REL_EXE1) $(REL_LIB3) $(REL_LIB1) $(REL_LIB2) $(REL_LIB4) $(REL_LIB5) $(REL_LIB7)
        install -d $(APP_LIB_DIR)
        install $(REL_LIB1) $(APP_LIB_DIR)
        install $(REL_LIB2) $(APP_LIB_DIR)
        install $(REL_LIB3) $(APP_LIB_DIR)
        install $(REL_LIB4) $(APP_LIB_DIR)
        install $(REL_LIB5) $(APP_LIB_DIR)
        install $(REL_LIB7) $(APP_LIB_DIR)
        install $(REL_LIB8) $(APP_LIB_DIR)
        install $(REL_LIB9) $(APP_LIB_DIR)
        install $(REL_LIB10) $(APP_LIB_DIR)
        install $(REL_LIB11) $(APP_LIB_DIR)
        install $(REL_LIB12) $(APP_LIB_DIR)
        install $(REL_EXE1) $(EXEC_DIR)

无论如何,已添加

#include 

到顶部

/home/project/the_system/core_app/interface/src/messaging.c

我需要做什么才能让它正确编译？

作为一个奖金问题,有没有办法确定哪一个:

-pthread
-lpthread
-lpthreads
-lrt
-rt

对于我们特定的构建环境,它是正确的吗？

编辑添加(也是TL; DR):

我似乎遇到了这个问题中提到的场景的完全重复.

但是,无论我在哪里粘贴-lpthread和-lrt参数,都会出错.

例如,我尝试添加对pthread_mutex_trylock的调用,但无法编译:

undefined reference to 'pthread_mutex_trylock'

...即使调用pthread_mutex_lock的现有函数编译正常.