Question

我有一个使用arm-none-eabi-gcc工具链在C语言中为ARM设备编写和开发的项目。它使用一个自定义的makefile，它只适用于C编译。我们正在尝试转换到主要的C ++项目，同时保留C源文件，但我在更新makefile时遇到问题。我知道这已被问过几次，但没有一个能够彻底解决我们的问题。如何使用g ++和cpp文件包含C源文件和头文件？

我非常感谢愿意并且能够查看我们的makefile以帮助解决编译问题的任何人。 makefile很长，所以这里有一个有点删节的版本，应该包含一切关键的内容。

请记住，我这里只包含了makefile，而不是platform_id.mk或$（PLATFORM_MCU）.mk，但我对这些文件非常有信心。

BIN_NAME = $(PLATFORM)_firmware.bin
ifdef PLATFORM
include $(PROJECT_ROOT)build/platform_id.mk
include $(PROJECT_ROOT)hal/$(PLATFORM_MCU)/$(PLATFORM_MCU).mk
include $(PROJECT_ROOT)build/$(PLATFORM_MCU_CORE)/$(PLATFORM_MCU_CORE).mk
else
$(error "Platform not defined. Used the -e flag to define the platform in the environment
endif
$(info $(msg))

# C compiler flags
CFLAGS +=\
    -std=c99\
    -Og\
    -g3\
    -Wall\
    -fdata-sections\
    -ffunction-sections\
    -MMD\
    -DHAVE_MMAP=0\
    -Dmalloc_getpagesize=8\
    -DMORECORE_CLEARS=0\
    -DDEFAULT_TRIM_THRESHOLD=8

# C++ compiler flags
CXXFLAGS +=\
    -Wall\
    -D__STDC_LIMIT_MACROS

# C Pre Processor flags
CPPFLAGS +=\

# Undefine WIN32 variable if building on Windows host
ifdef WIN32
CFLAGS += -UWIN32
msg = You're on a windows host.
else
msg = You're not on a windows host.
endif

ifdef TOOLCHAIN
AR = $(TOOLCHAIN)-ar
CC = $(TOOLCHAIN)-gcc
CXX = $(TOOLCHAIN)-g++
endif

# Binary make targets
TARGET = out/$(PLATFORM_MCU)/$(BIN_NAME)


# Binary Sources
VPATH += $(wildcard */src/)
# extract all *.c filenames, don't pull the filepath with it
C_SRCS += $(notdir $(wildcard */src/*.c))
# extract all *.cpp filesnames, don't pull the filepath with it
CXX_SRCS += $(notdir $(wildcard */src/*.cpp))
# extract all *.s filenames, don't pull the filepath with it
S_SRCS += $(notdir $(wildcard */src/*.s))

# Objects
OBJECTS_C += $(patsubst %.c,out/$(PLATFORM_MCU)/obj/%.o,$(C_SRCS))
OBJECTS_CXX += $(patsubst %.cpp,out/$(PLATFORM_MCU)/obj/%.o,$(CXX_SRCS))

# Dependencies
DEP_C := $(OBJECTS_C:.o=.d)
DEP_CXX := $(OBJECTS_CXX:.o=.d)


# Includes
NULL =
SPACE = $(NULL) $(NULL)
INCLUDE_SRC = $(subst $(SPACE),$(SPACE)-I,$(VPATH))
PATH_INC = $(wildcard */inc/)
INCLUDE_INC = $(subst $(SPACE),$(SPACE)-I,$(PATH_INC))

C_INC +=\
    -I$(INCLUDE_INC) \
    -I$(INCLUDE_SRC)



# Clean and precious
PRECIOUS += out/$(PLATFORM_MCU)/obj/%.o
CLEAN += out/$(PLATFORM_MCU)/

# all
all: $(TARGET)

# Create binary
$(TARGET): $(OBJECTS_C) $(OBJECTS_CXX) $(S_SRCS)
    @mkdir -p $(dir $@)
    $(CXX) $(CXXFLAGS) $(C_INC) -T$(LDFILE) $(LFLAGS) -o $@
    $(TOOLCHAIN)-objcopy -O binary $@ $(basename $@).bin

# Compile from cpp files. Compilation works when this is removed (and toolchain and files are tweaked to represent that)
out/$(PLATFORM_MCU)/obj/%.o: %.cpp
    @mkdir -p $(dir $@)
    $(CXX) $(CXXFLAGS) $(C_INC) -o $@ -c $<

-include $(DEP_CXX)

# Create binary from c files
out/$(PLATFORM_MCU)/obj/%.o: %.c
    @mkdir -p $(dir $@)
    $(CC) $(CFLAGS) $(C_INC) -o $@ -c $<

-include $(DEP_C)

.PRECIOUS: $(PRECIOUS)


.PHONY: all clean


clean:
    rm -rf $(CLEAN)

运行make -e PLATFORM=test之后，错误很多，并且主要说明未定义c源代码中的各种功能。现在main.cpp并不比int main()多得多，并且包含在包含大多数其他C头文件的头文件中。

以下是其中一个编译器错误的示例：

hal/atsamg55/sam/drivers/usart/usart.h:333:47: error: 'p_usart' was not declared in this scope
 uint32_t usart_get_writeprotect_status(Usart *p_usart);

这是main.cpp

#include "headers.h"

int main(){   

  while(1)
  {

  }

  return 0;
}

再次感谢您提供的任何帮助。

Answer 1

感谢您的帮助，我想我能够解决这个问题，并希望将其发布在此处以防将来帮助任何人。关于所有C文件的错误来自我没有正确地将定义从CFLAGS转移到CXX标志的错误。一旦我添加了-DBOARD = TEST相关的标志，我的头文件就能识别我正在使用的板，它允许它通过“包含”链。

在一个Makefile中编译C ++和C

1 个答案: