Hi,
kann mir Jeman erklären, wieso ich bei folgendem:
1 | SET(CMAKE_C_COMPILER ${AVRBIN}/avr-gcc)
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2 | SET(CMAKE_CXX_COMPILER ${AVRBIN}/avr-g++)
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3 |
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4 | #Binaryinterface (ABI)
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5 | #-funsigned-char
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6 | #-funsigned-bitfields
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7 | #-fpack-struct
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8 | #-fshort-enums
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9 | add_compile_options(-funsigned-char) # CMake 2.8.12 or newer
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10 | add_compile_options(-fshort-enums)
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11 | add_compile_options(-ffunction-sections)
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12 | add_compile_options(-fdata-sections)
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13 |
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14 | add_compile_options(-Wall)#all Warnings
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15 | add_compile_options(-std=gnu99)
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16 |
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17 | SET(COMMON_FLAGS -Os -mmcu=${DEVICE} -DF_CPU=${FREQ}UL -Wl,--gc-sections)
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18 | #add_compile_options(${COMMON_FLAGS}) #(__AVR_ATmega??__)
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19 | #add_link_options(${COMMON_FLAGS})
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20 |
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21 | SET(CMAKE_C_FLAGS "-Os -mmcu=${DEVICE} -DF_CPU=${FREQ}UL -std=gnu99 -Wl,--gc-sections")
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22 | SET(CMAKE_CXX_FLAGS "-Os -mmcu=${DEVICE} -DF_CPU=${FREQ}UL -Wl,--gc-sections")
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auf ein Compilat von:
Device: atmega88
Program: 7830 bytes (95.6% Full)
(.text + .data + .bootloader)
Data: 85 bytes (8.3% Full)
(.data + .bss + .noinit)
EEPROM: 6 bytes (1.2% Full)
(.eeprom)
und hingegen bei:
1 | SET(CMAKE_C_COMPILER ${AVRBIN}/avr-gcc)
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2 | SET(CMAKE_CXX_COMPILER ${AVRBIN}/avr-g++)
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3 |
|
4 | #Binaryinterface (ABI)
|
5 | #-funsigned-char
|
6 | #-funsigned-bitfields
|
7 | #-fpack-struct
|
8 | #-fshort-enums
|
9 | add_compile_options(-funsigned-char) # CMake 2.8.12 or newer
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10 | add_compile_options(-fshort-enums)
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11 | add_compile_options(-ffunction-sections)
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12 | add_compile_options(-fdata-sections)
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13 |
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14 | add_compile_options(-Wall)#all Warnings
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15 | add_compile_options(-std=gnu99)
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16 |
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17 | SET(COMMON_FLAGS -Os -mmcu=${DEVICE} -DF_CPU=${FREQ}UL -Wl,--gc-sections)
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18 | add_compile_options(${COMMON_FLAGS}) #(__AVR_ATmega??__)
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19 | add_link_options(${COMMON_FLAGS})
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20 |
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21 | #SET(CMAKE_C_FLAGS "-Os -mmcu=${DEVICE} -DF_CPU=${FREQ}UL -std=gnu99 -Wl,--gc-sections")
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22 | #SET(CMAKE_CXX_FLAGS "-Os -mmcu=${DEVICE} -DF_CPU=${FREQ}UL -Wl,--gc-sections")
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auf:
Device: atmega88
Program: 5382 bytes (65.7% Full)
(.text + .data + .bootloader)
Data: 85 bytes (8.3% Full)
(.data + .bss + .noinit)
EEPROM: 6 bytes (1.2% Full)
(.eeprom)
Meines Verständnisses nach haben ich nur andere Befehle verwendet, um
die Optionen hinzuzufügen. Das Resultät lässt mich aber glauben, dass
bei einem von beiden etwas anders greift.
Viele Grüße
PS: die letzten vier Zeilen sind mit Kommetaren "getoggelt"
