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我有一个正在做的嵌入式项目，我想用 Vim 和 YCM 来做。我有以下代码作为快速原型：

#include <avr/io.h>

#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((F_CPU/(USART_BAUDRATE*16UL)))-1)

int main(void){
 char recieved_byte;

 UCSR0B |= (1<<RXEN0)  | (1<<TXEN0);
 UCSR0C |= (1<<UCSZ00) | (1<<UCSZ01);
 UBRR0H  = (BAUD_PRESCALE >> 8);
 UBRR0L  = BAUD_PRESCALE;

    for(;;){
  // wait until a byte is ready to read
  while( ( UCSR0A & ( 1 << RXC0 ) ) == 0 ){}

  // grab the byte from the serial port
  recieved_byte = UDR0;

  // wait until the port is ready to be written to
  while( ( UCSR0A & ( 1 << UDRE0 ) ) == 0 ){}

  // write the byte to the serial port
  UDR0 = recieved_byte;
    }
    return 0;   /* never reached */
}

我有一个`.ycm_extra_conf.py

import os
import ycm_core
from clang_helpers import PrepareClangFlags

# Set this to the absolute path to the folder (NOT the file!) containing the
# compile_commands.json file to use that instead of 'flags'. See here for
# more details: http://clang.llvm.org/docs/JSONCompilationDatabase.html
# Most projects will NOT need to set this to anything; you can just change the
# 'flags' list of compilation flags. Notice that YCM itself uses that approach.
compilation_database_folder = ''

# These are the compilation flags that will be used in case there's no
# compilation database set.
flags = [
'-D__AVR_ATtiny167__',
# THIS IS IMPORTANT! Without a "-std=<something>" flag, clang won't know which
# language to use when compiling headers. So it will guess. Badly. So C++
# headers will be compiled as C headers. You don't want that so ALWAYS specify
# a "-std=<something>".
# For a C project, you would set this to something like 'c99' instead of
# 'c++11'.
'-std=c99',
# ...and the same thing goes for the magic -x option which specifies the
# language that the files to be compiled are written in. This is mostly
# relevant for c++ headers.
# For a C project, you would set this to 'c' instead of 'c++'.
'-isystem',
'/usr/avr/include/avr',
'/usr/avr/include/',
'-isystem',
'/usr/local/avr/include',
'/usr/local/avr/',
'-DF_CPU=16000000UL',
'-DARCH=ARCH_ATTINY',
'-DF_USB=16000000',
'-DBOARD=BOARD_NONE',
'-DFLASH_SIZE_BYTES=128000',
'-DBOOTLOADER_SEC_SIZE_BYTES=8192',
'-DUSB_DEVICE_ONLY',
'-DNO_STREAM_CALLBACKS',
'-DINTERRUPT_CONTROL_ENDPOINT',
'-DUSE_FLASH_DESCRIPTORS',
'-DUSE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_PLLCLKSRC)"',
'-DFIXED_CONTROL_ENDPOINT_SIZE=32',
'-DFIXED_NUM_CONFIGURATIONS=1',
'-DMPU9150',
'-Os',
'-funsigned-char',
'-fpack-struct',
'-fshort-enums',
'-Wall',
'-Wstrict-prototypes',
'-I',
'.',
'-I',
'./XMEGA/',
'-I', 'include',
'-I.',
# This path is for AVR gcc. 
]

if compilation_database_folder:
  database = ycm_core.CompilationDatabase( compilation_database_folder )
else:
  database = None


def DirectoryOfThisScript():
  return os.path.dirname( os.path.abspath( __file__ ) )


def MakeRelativePathsInFlagsAbsolute( flags, working_directory ):
  if not working_directory:
    return flags
  new_flags = []
  make_next_absolute = False
  path_flags = [ '-isystem', '-I', '-iquote', '--sysroot=' ]
  for flag in flags:
    new_flag = flag

    if make_next_absolute:
      make_next_absolute = False
      if not flag.startswith( '/' ):
        new_flag = os.path.join( working_directory, flag )

    for path_flag in path_flags:
      if flag == path_flag:
        make_next_absolute = True
        break

      if flag.startswith( path_flag ):
        path = flag[ len( path_flag ): ]
        new_flag = path_flag + os.path.join( working_directory, path )
        break

    if new_flag:
      new_flags.append( new_flag )
  return new_flags


def FlagsForFile( filename ):
  if database:
    # Bear in mind that compilation_info.compiler_flags_ does NOT return a
    # python list, but a "list-like" StringVec object
    compilation_info = database.GetCompilationInfoForFile( filename )
    final_flags = PrepareClangFlags(
        MakeRelativePathsInFlagsAbsolute(
            compilation_info.compiler_flags_,
            compilation_info.compiler_working_dir_ ),
        filename )

  else:
    relative_to = DirectoryOfThisScript()
    final_flags = MakeRelativePathsInFlagsAbsolute( flags, relative_to )

  return {
    'flags': final_flags,
    'do_cache': True
  }

`

问题是，在编辑文件时，AVR 寄存器的每个实例（我认为是在文件中定义的，avr/io.h并且在文件中引用了它的后续位置.ycm_extra_conf.py）都被标记为undeclared identifier.

我正在使用 Arch Linux 并正在编写 ATMega328p。

我究竟做错了什么？

4

1 回答 1

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io.h 包括条件编译以选择特定的 AVR 部分。您的预处理器宏列表（-D...选项）不包括在内__AVR_ATmega328P__，因此代码解析器排除了所有必要的部分特定声明，就像预处理器不存在宏一样。

除了您拥有项目定义外，您还应该设置由编译器或构建系统定义的任何内容。

于 2016-07-02T10:24:41.963 回答