以下混乱的宏在visual studio和Keil ARM编译器下正确编译，但是对于ARM 6.3.1的GCC失败了：
#define DRV_ACFGCAL_REG_INDEX(regulator_name,register_num) ((ACFG_CFG##register_num##_EN##regulator_name##_LSB+3)/4 + ((register_num-2)*8))
#define DRV_ACFGCAL_RESET_INDEX(reset_name,reg_offset) ((ACFG_CFG##reg_offset##_R##reset_name##_LSB)+((reg_offset-1)*32))
#define DRV_ACFGCAL_INFO(rst,rst_reg,idx,docx,regi,vtr,pdcal) \
{ \
0 ,\
0 ,\
idx##_ACFG_IDX ,\
docx##_WORD_COUNT ,\
DRV_ACFGCAL_RESET_INDEX(rst,rst_reg) ,\
DRV_ACFGCAL_REG_INDEX(rst,##regi##) ,\
docx##_##vtr##_LSB ,\
docx##_##vtr##_OFFSET ,\
docx##_##pdcal##_VTRCAL_MASK ,\
docx##_##pdcal##_VTRCAL_RESET_VALUE ,\
}
#define DRV_ACFGCAL_INFOn(rst,rst_reg,idx,docx,regi,vtr,pdcal) \
{ \
0 ,\
0 ,\
idx##_ACFG_IDX ,\
docx##_WORD_COUNT ,\
DRV_ACFGCAL_RESET_INDEX(rst,rst_reg) ,\
DRV_ACFGCAL_REG_INDEX(rst,##regi##) ,\
0 ,\
0 ,\
0 ,\
0 ,\
}
/* Some blocks with reset bits don't have regulator bits. Deal with it by creating bogus values
* that can be used to identify those blocks in code. */
#define ACFG_CFGNONE_ENDAC01_LSB (NONE_INDEX*4)
#define ACFG_CFGNONE_ENDAC23_LSB (NONE_INDEX*4)
#define ACFG_CFGNONE_ENDAC45_LSB (NONE_INDEX*4)
#define ACFG_CFGNONE_ENREFCAL_LSB (NONE_INDEX*4)
#define ACFG_CFGNONE_ENTESTADC_LSB (NONE_INDEX*4)
#define ACFG_NONE_ENNONE_LSB 7
#define ACFG_NONE_ENNONE_OFFSET 2
#define ACFG_NONE_ENDAC01_LSB ACFG_NONE_ENNONE_LSB
#define ACFG_NONE_ENDAC01_OFFSET ACFG_NONE_ENNONE_OFFSET
#define ACFG_NONE_ENDAC23_LSB ACFG_NONE_ENNONE_LSB
#define ACFG_NONE_ENDAC23_OFFSET ACFG_NONE_ENNONE_OFFSET
#define ACFG_NONE_ENDAC45_LSB ACFG_NONE_ENNONE_LSB
#define ACFG_NONE_ENDAC45_OFFSET ACFG_NONE_ENNONE_OFFSET
#define ACFG_NONE_ENREFCAL_LSB ACFG_NONE_ENNONE_LSB
#define ACFG_NONE_ENREFCAL_OFFSET ACFG_NONE_ENNONE_OFFSET
#define ACFG_NONE_ENTESTADC_LSB ACFG_NONE_ENNONE_LSB
#define ACFG_NONE_ENTESTADC_OFFSET ACFG_NONE_ENNONE_OFFSET
#define NONE (2)
#define NONE_INDEX (63)
#define ACFG_INFO_addr(block) ((g_drv_acfg_info[block].m_index << 4) | FIRST_ACFG_BASE_ADDR)
#define DAC01_ACFG_IDX 1
#define DAC_WORD_COUNT 5
#define ACFG_CFG1_RDAC01_LSB 0
#define DAC_TESTA_T_VTR_LSB 1
#define DAC_TESTA_T_VTR_OFFSET 1
#define DAC_PDCAL_VTRCAL_MASK 0xf
#define DAC_PDCAL_VTRCAL_RESET_VALUE 0
typedef struct {
unsigned m_bEnabled : 1;
unsigned m_caled : 1; /**< 0 until calibration occurs. After being set, cal will not occur again */
unsigned m_index : 9; /**< The base index of the hardware block */
unsigned m_count : 5; /**< Number of registers in this hardware block */
unsigned m_resetIdx : 6; /**< which bit index (0-63) the reset for this block sits*/
unsigned m_regulatorIdx : 6; /**< which group of 3 controls the regulator for this block, 63 for none*/
unsigned m_vtrlsb : 4; /**< Left bit shifts into the testa register of a block to
place VTR on diaga */
unsigned m_vtroffset : 4; /**< Offset from base address of a block to the register containing
the bit for VTR on diaga */
unsigned m_vtrmask : 8; /**< The mask of the calcode register for a given block */
unsigned m_vtrcache : 7; /**< The starting calcode for a given block */
} drv_acfg_info_t;
drv_acfg_info_t g_drv_acfg_info[] = {
/* rst rst idx docx acfg VTR on CAL
* name reg# name name reg# diagA name regname function
* ------ ------ -------- -------- ----- ----------------- ------ ----- */
DRV_ACFGCAL_INFO (DAC01,1,DAC01,DAC,NONE,TESTA_T_VTR,PDCAL), //ACFG_BLK_DAC01,
};
预处理器似乎没有完全扩展的问题，正如错误所暗示的那样：
output/gcc_cortex_m3/simple/objs/main.c.o :
+ tests/simple/main.c
"C:/usr/gcc_arm/6_2017-q2-update"/bin/arm-none-eabi-gcc.exe -J"C:/usr/gcc_arm/6_2017-q2-update"/arm-none-eabi/include -MD -MF output/gcc_cortex_m3/simple/objs/main.c.d -E -J"C:/usr/gcc_arm/6_2017-q2-update"/arm-none-eabi/include -I. -D__MICROLIB -include gcc_preinclude.h -E -Dsi4790 -O3 -Os -g -D_DEBUG --no-exceptions -mthumb -mcpu=cortex-m3 -c -o output/gcc_cortex_m3/simple/objs/main.c.o tests/simple/main.c
tests/simple/main.c:17:87: error: pasting "," and "NONE" does not give a valid preprocessing token
DRV_ACFGCAL_REG_INDEX(rst,##regi##) ,\
^
tests/simple/main.c:91:5: note: in expansion of macro 'DRV_ACFGCAL_INFO'
DRV_ACFGCAL_INFO (DAC01,1,DAC01,DAC,NONE,TESTA_T_VTR,PDCAL), //ACFG_BLK_DAC01,
^~~~~~~~~~~~~~~~
tests/simple/main.c:91:41: error: pasting "NONE" and ")" does not give a valid preprocessing token
DRV_ACFGCAL_INFO (DAC01,1,DAC01,DAC,NONE,TESTA_T_VTR,PDCAL), //ACFG_BLK_DAC01,
^
tests/simple/main.c:17:90: note: in definition of macro 'DRV_ACFGCAL_INFO'
DRV_ACFGCAL_REG_INDEX(rst,##regi##) ,\
^~~~
make: *** [output/gcc_cortex_m3/simple/objs/main.c.o] Error 1
我为这些惊人数量的东西挤在一起道歉，但我们正在深度嵌入式环境中工作，我们需要为寄存器自动生成头文件而没有非常规则的布局（或命名约定）并尝试从他们身上做出一些东西。我们最终都试图让硬件看起来更加清醒。
我需要找到一种在GCC下“让它成功”的方法。关于我做错了什么的线索？我是否需要按摩我的宏（以及如何？）或者我是否需要刺激GCC以不同方式查看它们？
答案 0 :(得分：0)
答案是一些编译器对预处理器可以与##运算符一起使用的内容更为宽松。
Visual Studio和Keil ARM编译器基本上允许将任何内容粘贴在一起; GCC只会粘贴“预处理器令牌”（不包括,或.或);在preprocessor tokens上进行网络搜索以找到比我更好的参考提供）。
外卖的教训是：如果你做了疯狂的宏观滥用，那么期待海湾合作委员会更加挑剔，并可能打破你想要做的事情。