3.2.9 Other Options

• [-c --compile-only] will compile and assemble the source, but will not call the linkage editor.
• [--c1mode] reads the preprocessed source from standard input and compiles it. The file name for the assembler output must be specified using the -o option.
• [-E] Run only the C preprocessor. Preprocess all the C source files specified and output the results to standard output.
• [-o <path/file>] The output path where everything will be placed or the file name used for all generated output files. If the parameter is a path, it must have a trailing slash (or backslash for the Windows binaries) to be recognized as a path. Note for Windows users: if the path contains spaces, it should be surrounded by quotes. The trailing backslash should be doubled in order to prevent escaping the final quote, for example: -o ''F:\Projects\test3\output 1\\'' or put after the final quote, for example: -o ''F:\Projects\test3\output 1''\. The path using slashes for directory delimiters can be used too, for example: -o ''F:/Projects/test3/output 1/''.
• [--stack-auto] All functions in the source file will be compiled as reentrant, i.e. the parameters and local variables will be allocated on the stack. See section 3.7 Parameters and Local Variables for more details. If this option is used all source files in the project should be compiled with this option. It automatically implies --int-long-reent and --float-reent.
• [--callee-saves] function1[,function2][,function3].... The compiler by default uses a caller saves convention for register saving across function calls, however this can cause unnecessary register pushing and popping when calling small functions from larger functions. This option can be used to switch the register saving convention for the function names specified. The compiler will not save registers when calling these functions, no extra code will be generated at the entry and exit (function prologue and epilogue) for these functions to save and restore the registers used by these functions, this can SUBSTANTIALLY reduce code and improve run time performance of the generated code. In the future the compiler (with inter procedural analysis) will be able to determine the appropriate scheme to use for each function call. DO NOT use this option for built-in functions such as _mulint..., if this option is used for a library function the appropriate library function needs to be recompiled with the same option. If the project consists of multiple source files then all the source file should be compiled with the same --callee-saves option string. Also see #pragma callee_saves ite:callee_saves-function1[,function2[,function3...]]-.
• [--all-callee-saves] Function of --callee-saves will be applied to all functions by default.
• [--debug] When this option is used the compiler will generate debug information. The debug information collected in a file with .cdb extension can be used with the SDCDB. For more information see documentation for SDCDB. Another file with no extension contains debug information in AOMF or AOMF51 format which is commonly used by third party tools.
• [-S] Stop after the stage of compilation proper; do not assemble. The output is an assembler code file for the input file specified.
• [--int-long-reent] Integer (16 bit) and long (32 bit) libraries have been compiled as reentrant. Note by default these libraries are compiled as non-reentrant. See section Installation for more details.
• [--cyclomatic] This option will cause the compiler to generate an information message for each function in the source file. The message contains some important information about the function. The number of edges and nodes the compiler detected in the control flow graph of the function, and most importantly the cyclomatic complexity see section on Cyclomatic Complexity for more details.
• [--float-reent] Floating point library is compiled as reentrant. See section Installation for more details.
• [--funsigned-char] The default signedness for every type is signed. In some embedded environments the default signedness of char is unsigned. To set the signess for characters to unsigned, use the option --funsigned-char. If this option is set and no signedness keyword (unsigned/signed) is given, a char will be signed. All other types are unaffected.
• [--main-return] This option can be used if the code generated is called by a monitor program or if the main routine includes an endless loop. This option results in slightly smaller code and saves two bytes of stack space. The return from the 'main' function will return to the function calling main. The default setting is to lock up i.e. generate a 'sjmp .'.
• [--nostdinc] This will prevent the compiler from passing on the default include path to the preprocessor.
• [--nostdlib] This will prevent the compiler from passing on the default library path to the linker.
• [--verbose] Shows the various actions the compiler is performing.
• [-V] Shows the actual commands the compiler is executing.
• [--no-c-code-in-asm] Hides your ugly and inefficient c-code from the asm file, so you can always blame the compiler :)
• [--fverbose-asm] Include code generator and peep-hole comments in the generated asm files.
• [--no-peep-comments] Don't include peep-hole comments in the generated asm files even if --fverbose-asm option is specified.
• [--i-code-in-asm] Include i-codes in the asm file. Sounds like noise but is most helpful for debugging the compiler itself.
• [--less-pedantic] Disable some of the more pedantic warnings. For more details, see the less_pedantic pragma ite:less_pedantic.
• [--disable-warning <nnnn>] Disable specific warning with number <nnnn>.
• [--Werror] Treat all warnings as errors.
• [--print-search-dirs] Display the directories in the compiler's search path
• [--vc] Display errors and warnings using MSVC style, so you can use SDCC with the visual studio IDE. With SDCC both offering a GCC-like (the default) and a MSVC-like output style, integration into most programming editors should be straightforward.
• [--use-stdout] Send errors and warnings to stdout instead of stderr.
• [-Wa asmOption[,asmOption]...] Pass the asmOption to the assembler. See file sdcc/as/doc/asxhtm.html for assembler options.cd
• [--std-sdcc89] Generally follow the C89 standard, but allow SDCC features that conflict with the standard (default).
• [--std-c89] Follow the C89 standard and disable SDCC features that conflict with the standard.
• [--std-sdcc99] Generally follow the C99 standard, but allow SDCC features that conflict with the standard (incomplete support).
• [--std-c99] Follow the C99 standard and disable SDCC features that conflict with the standard (incomplete support).
• [--codeseg <Name>] The name to be used for the code segment, default CSEG. This is useful if you need to tell the compiler to put the code in a special segment so you can later on tell the linker to put this segment in a special place in memory. Can be used for instance when using bank switching to put the code in a bank.
• [--constseg <Name>] The name to be used for the const segment, default CONST. This is useful if you need to tell the compiler to put the const data in a special segment so you can later on tell the linker to put this segment in a special place in memory. Can be used for instance when using bank switching to put the const data in a bank.
• [--fdollars-in-identifiers] Permit '$' as an identifier character.
• [--more-pedantic] Actually this is not a SDCC compiler option but if you want more warnings you can use a separate tool dedicated to syntax checking like splint http://www.splint.org. To make your source files parseable by splint you will have to include lint.h in your source file and add brackets around extended keywords (like ''__at (0xab)'' and ''__interrupt (2)'').
  Splint has an excellent on line manual at http://www.splint.org/manual/ and it's capabilities go beyond pure syntax checking. You'll need to tell splint the location of SDCC's include files so a typical command line could look like this:
  splint -I /usr/local/share/sdcc/include/mcs51/  myprogram.c
• [--short-is-8bits] Treat short as 8-bit (for backward compatibility with older versions of compiler - see section 1.4)