Introduction
The Build System section contains information on subjects such as the GCC Compiler and Build Environment.
GCC Compiler Flags
Compiler flags can be added or modified in both NBEclipse and command line makefiles.
Generic
| Language | Mode | Flag | Description |
| C/C++ | R, D | -gdwarf-2 | Adds dwarf-2 debug symbols to the binary. This makes it easier to resolve symbols in gdb. |
| C/C++ | R, D | -Wall | Enables all warnings. |
| C/C++ | R, D | -Werror=return-type | Treats warnings as errors for functions that are missing a return statement. |
| C/C++ | R, D | -Wno-unused | Suppresses warnings for unused variables. |
| C/C++ | R, D | -falign-functions=4 | Aligns functions to 4-byte boundaries for improved performance. |
| C/C++ | R | -O2 | Enables level 2 optimization for improved performance. |
| C/C++ | D | -O0 | Disables optimization for debugging. |
| C/C++ | R, D | -D PLATFORM_NAME=$(PLATFORM_NAME) | Defines the PLATFORM_NAME macro with the value of the PLATFORM_NAME environment variable. |
| C/C++ | R, D | $(NBINCLUDE) | Includes the specified directories in the search path for header files. |
| C | R, D | -std=gnu17 | Sets the C standard to GNU C17. |
| C | R, D | -ffunction-sections | Places each function in a separate section to enable linker optimizations. |
| C | R, D | -fdata-sections | Places each data object in a separate section to enable linker optimizations. |
| C++ | R, D | -std=gnu++17 | Sets the C++ standard to GNU C++17. |
| C++ | R, D | -fno-rtti | Disables runtime type information (RTTI) for improved performance. |
| C++ | R, D | -fno-exceptions | Disables C++ exceptions for improved performance. |
| C++ | R, D | -Wno-register | Suppresses warnings for unused register variables. |
| C++ | R, D | -ffunction-sections | Places each function in a separate section to enable linker optimizations. |
| C++ | R, D | -fdata-sections | Places each data object in a separate section to enable linker optimizations. |
| Assembler | R, D | $(CPUFLAG) | Specifies the CPU architecture flag. |
Architecture-Specific Compiler Flags
ARM Cortex-M7
| Language | Mode | Flag | Description |
| C/C++ | R, D | -fasynchronous-unwind-tables | Enables asynchronous unwind tables |
| C/C++ | R, D | -D_C11_SOURCE | Defines the _C11_SOURCE macro. |
| C/C++ | R, D | -DCORTEX_M7 | Defines the CORTEX_M7 macro. |
ARM Cortex-M0+
| Language | Mode | Flag | Description |
| C/C++ | R, D | -fasynchronous-unwind-tables | Enables asynchronous unwind tables |
| C/C++ | D | -fomit-frame-pointer | Omit frame pointer for improved performance. |
| C/C++ | R, D | -D_C11_SOURCE | Defines the _C11_SOURCE macro. |
| C/C++ | R, D | -DCORTEX_M0PLUS | Defines the CORTEX_M0PLUS macro. |
ColdFire
| Language | Mode | Flag | Description |
| C/C++ | R, D | -fno-omit-frame-pointer | Do not omit frame pointer for improved debugging |
| C/C++ | R, D | -fasynchronous-unwind-tables | Enables asynchronous unwind tables |
| C/C++ | R, D | -DCOLDFIRE | Defines the COLDFIRE macro |
| Assembler | D | --defsym _DEBUG=1 | Defines the _DEBUG symbol. |
CPU-Specific Compiler Flags
SAME70
| Language | Mode | Flag | Description |
| C/C++ | R, D | -mcpu=cortex-m7 | Specifies the CPU architecture. |
| C/C++ | R, D | -mthumb | Specifies the Thumb instruction set. |
| C/C++ | R, D | -mfpu=fpv5-d16 | Specifies the floating-point unit. |
| C/C++ | R, D | -mfloat-abi=$(ABI_OPT) | Specifies the floating-point ABI. Defaults to softfp |
| C/C++ | R, D | -D$(CPU) | Defines the $(CPU) macro. |
| C++ | R, D | -fno-use-cxa-atexit | Disables the use of __cxa_atexit |
| C++ | R, D | -falign-fuinctions=4 | Aligns functions to 4-byte boundaries for improved performance. |
MIMXRT11xx, MIMXRT10xx
| Language | Mode | Flag | Description |
| C/C++ | R, D | -mcpu=cortex-m7 | Specifies the CPU architecture. |
| C/C++ | R, D | -mthumb | Specifies the Thumb instruction set. |
| C/C++ | R, D | -mfpu=fpv5-d16 | Specifies the floating-point unit. |
| C/C++ | R, D | -mfloat-abi=$(ABI_OPT) | Specifies the floating-point ABI. Defaults to softfp |
| C/C++ | R, D | -D$(CPU) | Defines the $(CPU) macro. |
| C++ | R, D | -fno-use-cxa-atexit | Disables the use of __cxa_atexit |
| C++ | R, D | -falign-fuinctions=8 | Aligns functions to 8-byte boundaries for improved performance. |
SAMD20
| Language | Mode | Flag | Description |
| C/C++ | R, D | -mcpu=cortex-m0plus | Specifies the CPU architecture. |
| C/C++ | R, D | -mthumb | Specifies the Thumb instruction set. |
| C++ | R | -fno-use-cxa-atexit | Disables the use of __cxa_atexit |
| C++ | R | -falign-fuinctions=4 | Aligns functions to 4-byte boundaries for improved performance. |
MCF5441X
| Language | Mode | Flag | Description |
| C/C++ | R, D | -D$(CPU) | Defines the $(CPU) macro. |
| C/C++ | R, D | -mcpu=54415 | Specifies the CPU architecture. |
Platform-Specific Compiler Flags
MODM7AE70
| Language | Mode | Flag | Description |
| C/C++ | R, D | -D__SAME70Q21__ | Defines the __SAME70Q21__ macro. |
| C/C++ | R, D | -DMODM7AE70 | Defines the MODM7AE70 macro. |
SBE70LC
| Language | Mode | Flag | Description |
| C/C++ | R, D | -D__SAME70Q21__ | Defines the __SAME70Q21__ macro. |
| C/C++ | R, D | -DSBE70LC | Defines the SBE70LC macro. |
SOMRT1061
| Language | Mode | Flag | Description |
| C/C++ | R, D | -D__MIMXRT106xx__ | Defines the __MIMXRT106xx__ macro. |
| C/C++ | R, D | -D__MIMXRT1061__ | Defines the __MIMXRT1061__ macro. |
| C/C++ | R, D | -DSOMRT1061 | Defines the SOMRT1061 macro. |
MOD5441X
| Language | Mode | Flag | Description |
| C/C++ | R, D | -DMOD5441X | Defines the MOD5441X macro. |
NANO54415
| Language | Mode | Flag | Description |
| C/C++ | R, D | -DNANO54415 | Defines the NANO54415 macro. |
SB800EX
| Language | Mode | Flag | Description |
| C/C++ | R, D | -DSB800EX | Defines the SB800EX macro. |
Linker Flags
Generic
| Flag | Description |
$(CPUFLAG) | Specifies the CPU architecture flag. |
-Wl,-n | Disables linking to dyn |
-T$(NNDK_ROOT)/platform/$(PLATFORM)/lib/$(PLATFORM).ld | Specifies the linker script. |
-Wl,-R$(NNDK_ROOT)/platform/$(PLATFORM)/lib/sys.ld | Specifies the linker script. |
-Wl,-Map=$(@:.elf=.map) | Generates a map file. |
-Wl,--cref | Generates a cross-reference table. |
-Wl,--gc-sections | Removes unused sections to reduce the size of the binary. |
-Wl,--start-group,$(NBLIBS) $(XTRALIB) -lstdc++ -lc -Wl,--end-group | Specifies the libraries to link. |
Architecture-Specific Linker Flags
None
CPU-Specific Linker Flags
SAME70
| Flag | Description |
-nostartfiles | Disables linking to the default startup files. |
-mfloat-abi=$(ABI_OPT) | Specifies the floating-point ABI. Defaults to softfp |
-Wl--thumb-entry=Reset_Handler | Specifies the entry point. |
-Wl--thumb-entry=_start_ | Specifies the entry point. (SOMRT1061) |
MIMXRT11xx, MIMXRT10xx
| Flag | Description |
-nostartfiles | Disables linking to the default startup files. |
-mfloat-abi=$(ABI_OPT) | Specifies the floating-point ABI. Defaults to softfp |
-Wl--thumb-entry=Reset_Handler | Specifies the entry point. |
SAMD20
| Flag | Description |
-nostartfiles | Disables linking to the default startup files. |
-Wl--thumb-entry=Reset_Handler | Specifies the entry point. |
MCF5441X
None
Platform-Specific Linker Flags
None
Pack Binary
Generic
None
Architecture-Specific
None
CPU-Specific
MCF5441X
| Executable | I/O | Flag | Description |
m68k-elf-objcopy | .elf -> .s19 | -O srec | Converts the elf file to s19 |
m68k-elf-objcopy | .elf -> .s19 | -Wl,--gc-sections | Removes unused sections to reduce the size of the binary. |
m68k-elf-objcopy | .elf -> .s19 | --strip-all | Removes all symbols from the binary. |
compcode | .s19 -> _APP.s19 | -M $(^:.s19=.map) | Specifies the map file. |
compcode | .s19 -> _APP.s19 | -R | Print report. |
compcode | .s19 -> _APP.s19 | -P$(PLATFORM) | Specifies the platform. |
compcode | .s19 -> .bin | -O binary | Converts the s19 file to binary |
compcode | .s19 -> .bin | -M $(^:.s19=.map) | Specifies the map file. |
compcode | .s19 -> .bin | -B | Specifies binary output. |
compcode | .s19 -> .bin | -P$(PLATFORM) | Specifies the platform. |
compcode | .s19 -> .bin | -R | Print report. |
SAMD20
| Executable | I/O | Flag | Description |
nbfspack | .elf -> .bin | -output-target bin | Converts the elf file to binary |
SAME70
| Executable | I/O | Flag | Description |
arm-none-eabi-size | .elf -> .bin | | Displays the size of the binary. |
nbfspack | .elf -> .bin | -output-target bin | Converts the elf file to binary |
nbfspack | .elf -> .bin | -S | Show build statistics. |
nbfspack | .elf -> .bin | -P $(PLATFORM) | Specifies the platform. |
MIMXRT11xx, MIMXRT10xx
| Executable | I/O | Flag | Description |
nbfspack | .elf -> .bin | -output-target bin | Converts the elf file to binary |
Platform-Specific
MODM7AE70
| Executable | I/O | Flag | Description |
nbfspack | .elf -> .bin | -C | Compress program sections |
nbfspack | .elf -> .bin | -cflag S:3 | . |
nbfspack | .elf -> .bin | -cflag S:0 | . |
nbfspack | .elf -> .bin | -cflag S:1 | . |
SBE70LC
| Executable | I/O | Flag | Description |
nbfspack | .elf -> .bin | -C | Compress program sections |
nbfspack | .elf -> .bin | -cflag S:3 | . |
nbfspack | .elf -> .bin | -cflag S:0 | . |
nbfspack | .elf -> .bin | -cflag S:1 | . |
SOMRT1061
None
MOD5441X
| Executable | I/O | Flag | Description |
compcode | .s19 -> .bin | 0xC0040000 0xC1FC0000 | Application address range. |
NANO54415
| Executable | I/O | Flag | Description |
compcode | .s19 -> .bin | 0x04000 0x800000 | Application address range. |
SB800EX
| Executable | I/O | Flag | Description |
compcode | .s19 -> .bin | 0x04000 0x800000 | Application address range. |
