4.6.2 Port Specific Options

The port specific options appear after the global options in the sdcc --help output.

4.6.2.1 Code Generation Options

These options influence the generated assembler code.

--pstack-model=[model]

Used in conjuction with the command above. Defines the stack model to be used, valid stack models are:

• [small] Selects small stack model. 8 bit stack and frame pointers. Supports 256 bytes stack size.
• [large] Selects large stack model. 16 bit stack and frame pointers. Supports 65536 bytes stack size.

--pno-banksel

Do not generate BANKSEL assembler directives.

--extended

Enable extended instruction set/literal offset addressing mode. Use with care!

4.6.2.2 Optimization Options

--obanksel=n

Set optimization level for inserting BANKSELs.

• [0] no optimization
• [1] checks previous used register and if it is the same then does not emit BANKSEL, accounts only for labels.
• [2] tries to check the location of (even different) symbols and removes BANKSELs if they are in the same bank.
  Important: There might be problems if the linker script has data sections across bank borders!

--denable-peeps

Force the usage of peepholes. Use with care.

--no-optimize-goto

Do not use (conditional) BRA instead of GOTO.

--optimize-cmp

Try to optimize some compares.

--optimize-df

Analyze the dataflow of the generated code and improve it.

4.6.2.3 Assembling Options

--asm=

Sets the full path and name of an external assembler to call.

--mplab-comp

MPLAB compatibility option. Currently only suppresses special gpasm directives.

4.6.2.4 Linking Options

--link=

Sets the full path and name of an external linker to call.

--preplace-udata-with=[kword]

Replaces the default udata keyword for allocating unitialized data variables with [kword]. Valid keywords are: "udata_acs", "udata_shr", "udata_ovr".

--ivt-loc=n

Place the interrupt vector table at address n. Useful for bootloaders.

--nodefaultlibs

Do not link default libraries when linking.

--use-crt=

Use a custom run-time module instead of the defaults.

--no-crt

Don't link the default run-time modules

4.6.2.5 Debugging Options

Debugging options enable extra debugging information in the output files.

--debug-xtra

Similar to --debug, but dumps more information.

--debug-ralloc

Force register allocator to dump <source>.d file with debugging information. <source> is the name of the file being compiled.

--pcode-verbose

Enable pcode debugging information in translation.

--calltree

Dump call tree in .calltree file.

--gstack

Trace push/pops for stack pointer overflow.