使用ARM提供的GNU Tools for ARM Embedded Processors工具链，您需要使用以下代码进行编译：

-mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16

以使用硬件浮点。请参阅readme.txt档案中的下表：

Architecture options usage
--------------------------------------------------------------------
| ARM Core | Command Line Options                       | multilib |
|----------|--------------------------------------------|----------|
|Cortex-M0+| -mthumb -mcpu=cortex-m0plus                | armv6-m  |
|Cortex-M0 | -mthumb -mcpu=cortex-m0                    |          |
|Cortex-M1 | -mthumb -mcpu=cortex-m1                    |          |
|          |--------------------------------------------|          |
|          | -mthumb -march=armv6-m                     |          |
|----------|--------------------------------------------|----------|
|Cortex-M3 | -mthumb -mcpu=cortex-m3                    | armv7-m  |
|          |--------------------------------------------|          |
|          | -mthumb -march=armv7-m                     |          |
|----------|--------------------------------------------|----------|
|Cortex-M4 | -mthumb -mcpu=cortex-m4                    | armv7e-m |
|(No FP)   |--------------------------------------------|          |
|          | -mthumb -march=armv7e-m                    |          |
|----------|--------------------------------------------|----------|
|Cortex-M4 | -mthumb -mcpu=cortex-m4 -mfloat-abi=softfp | armv7e-m |
|(Soft FP) | -mfpu=fpv4-sp-d16                          | /softfp  |
|          |--------------------------------------------|          |
|          | -mthumb -march=armv7e-m -mfloat-abi=softfp |          |
|          | -mfpu=fpv4-sp-d16                          |          |
|----------|--------------------------------------------|----------|
|Cortex-M4 | -mthumb -mcpu=cortex-m4 -mfloat-abi=hard   | armv7e-m |
|(Hard FP) | -mfpu=fpv4-sp-d16                          | /fpu     |
|          |--------------------------------------------|          |
|          | -mthumb -march=armv7e-m -mfloat-abi=hard   |          |
|          | -mfpu=fpv4-sp-d16                          |          |
|----------|--------------------------------------------|----------|
|Cortex-R4 | [-mthumb] -march=armv7-r                   | armv7-ar |
|Cortex-R5 |                                            | /thumb   |
|Cortex-R7 |                                            |      |
|(No FP)   |                                            |          |
|----------|--------------------------------------------|----------|
|Cortex-R4 | [-mthumb] -march=armv7-r -mfloat-abi=softfp| armv7-ar |
|Cortex-R5 | -mfpu=vfpv3-d16                            | /thumb   |
|Cortex-R7 |                                            | /softfp  |
|(Soft FP) |                                            |          |
|----------|--------------------------------------------|----------|
|Cortex-R4 | [-mthumb] -march=armv7-r -mfloat-abi=hard  | armv7-ar |
|Cortex-R5 | -mfpu=vfpv3-d16                            | /thumb   |
|Cortex-R7 |                                            | /fpu     |
|(Hard FP) |                                            |          |
|----------|--------------------------------------------|----------|
|Cortex-A* | [-mthumb] -march=armv7-a                   | armv7-ar |
|(No FP)   |                                            | /thumb   |
|----------|--------------------------------------------|----------|
|Cortex-A* | [-mthumb] -march=armv7-a -mfloat-abi=softfp| armv7-ar |
|(Soft FP) | -mfpu=vfpv3-d16                            | /thumb   |
|          |                                            | /softfp  |
|----------|--------------------------------------------|----------|
|Cortex-A* | [-mthumb] -march=armv7-a -mfloat-abi=hard  | armv7-ar |
|(Hard FP) | -mfpu=vfpv3-d16                            | /thumb   |
|          |                                            | /fpu     |
--------------------------------------------------------------------

您应该 * 真正 * 阅读gcc工具链附带的README文件，无论您从哪里获得它们。