Things that might be considered to be evaluated/implemented/included in the future:

Table of Contents Compiler Assembler Linker Disassembler Compile & Link Utility Platform-independent run-time libraries CBM library C64 library C128 library CBM510 library Creativision library Apple II library Atari library GEOS library NES library Ohio Scientific C1P library Documentation

• Fix standard compliance problems in the preprocessor.
• Braces in initializers work in a non-standard way; standard-compliant initializers with braces are not always accepted.
• Floating-point support

• Implement "weak" symbols.
• Eventually, change .addrsize() from an optional (experimental) .feature into a normal (always available) function.
• Add -W error option (and, use it in the C library Makefile).

• Fix issues with the o65 format.
• Map files do not work for o65 output in the presence of o65-external symbols.
• Add an option to omit the generation of output files if the file length is zero (useful for unused overlays).
• Intel hex output.
• Segment overlays.

• Add capability to call other external programs for processing, for example, Pucrunch.

• Complete multiplication and division routines. Currently, it's somewhat a mess.
• The changes in the TGI library need a review and clean-up. The new vector font routines need testing, docs., and maybe a sample program. Clipping is probably not implemented (needs check).
• There's a function tgi_imulround() -- declared in tgi.h -- that can be used with tgi_getaspectratio() to scale a value "up" by the aspect ratio. However, it is desirable to be able to scale "down", as well, by the aspect ratio -- maybe with a function called tgi_idivround().
• Implement an alternative "naive" heap manager that simply increments a pointer for every allocation (and, doesn't actually de-allocate anything), to allow, e.g., the module loader to be used without linking in the full-blown heap manager.
• Discuss if it is desirable to have standard SER and/or EMD drivers -- like the standard JOY, MOU, and TGI drivers.
• Several formats in printf() are broken: printf("%04d",-12) and printf("%#04x",12) are examples.
• Abstract printer support.

• Implement the DIO interface.
• Implement a Userport SER driver based on George Hug's 'Toward 2400' source code -- http://archive.org/details/transactor-magazines-v9-i03.
• Implement another Userport SER driver based on Daniel Dallmann's 'UP9600' source code -- https://github.com/bozimmerman/Zimodem/blob/master/cbm8bit/src/up9600.asm.
• Remove prepending "0:" / "1:" to POSIX filenames -- http://cc65.github.io/mailarchive/2012-08/10683.html.
• Review handling of O_... flags in POSIX open() -- https://cc65.github.io/mailarchive/2010-02/7863.html.

• Implement OUTTEXT in the TGI driver.
• Add extra EMD and joystick drivers.

• Implement OUTTEXT in the TGI drivers.
• Find ways to increase the RAM size available to cc65 programs.
• Test EM drivers with the multidemo sample; and, fix the broken ones.
• Make a VIC-II TGI driver -- needs different BASIC header and CFG files that open nine Kibibytes below the program (i.e., GRAPHIC 1).

• Make a TGI driver, based on the C64 driver.

• Find out CLOCKS_PER_SEC value.
• Implement waitvsync().

• Have the EM driver detect AUXMEM, and cooperate with /RAM.
• Implement a TGI driver that "hides" the hires screen, using AUXMEM.

• Limit effect of cursor() to cgetc() as documented.
• Add dio_query_sectcount() to complete the DIO implementation.
  • algorithm as follows (see http://cc65.github.io/mailarchive/2012-10/10974.html):
    • Read the 4th sector. (The xf551 drive had a bug, it returned the wrong PERCOM info after reading the normally 128-byte boot sectors; a read from sector 4 eliminates that chance). See also https://atariage.com/forums/topic/297498-writing-a-sector-copier-cart-need-some-info/?do=findComment&comment=4383902.
    • Read the status (SIO command 0x53), and save that info.
    • Request a PERCOM block. If it succeeds, use that information.
    • If reading the PERCOM block fails, assume 1050, 810, (or even 815), or compatible. Use the status byte 0 to differentiate between single, enhanced (medium), and double density. (bit 5 is set if double density, and bit 7 is set if enhanced density). If we're looking for only the sector count, only bit 7 matters. See also https://atariage.com/forums/topic/301964-percom-block-question/.
• Complete implementation of the functions in device.h; and, test them with samples/enumdevdir.c.
• Improve exec() command line handling.
• Implement 80-column CONIO support targeting the XEP80 interface module. Possibly as an "extra" .o file that "overrides" cputc.o in the C library.

• Make dio_query_sectcount() less naive.
• Adjust the MOU driver to the current MOU kernel interface.
• Implement the functions in device.h; and, test them with samples/enumdevdir.c.

• Add interruptor support (and check if the current interrupt handling really belongs in crt0.s).

• Add simple POSIX read() and write(), so that portable programs can use the stdio functions to talk through the console.

• Update a font engine sample 'tgi-preview'.
• Describe what the tools show at various levels when they're told to be --verbose.