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3.1.5 Using sdcclib to Create and Manage Libraries

Alternatively, instead of having a .rel file for each entry on the library file as described in the preceding section, sdcclib can be used to embed all the modules belonging to such library in the library file itself. This results in a larger library file, but it greatly reduces the number of disk files accessed by the linker. Additionally, the packed library file contains an index of all include modules and symbols that significantly speeds up the linking process. To display a list of options supported by sdcclib type:

sdcclib -?
To create a new library file, start by compiling all the required modules. For example:

sdcc -c _divsint.c

sdcc -c _divuint.c

sdcc -c _modsint.c

sdcc -c _moduint.c

sdcc -c _mulint.c

This will create files _divsint.rel, _divuint.rel, _modsint.rel, _moduint.rel, and _mulint.rel. The next step is to add the .rel files to the library file:

sdcclib libint.lib _divsint.rel

sdcclib libint.lib _divuint.rel

sdcclib libint.lib _modsint.rel

sdcclib libint.lib _moduint.rel

sdcclib libint.lib _mulint.rel

Or, if you preffer:

sdcclib libint.lib _divsint.rel _divuint.rel _modsint.rel _moduint.rel _mulint.rel

If the file already exists in the library, it will be replaced. If a list of .rel files is available, you can tell sdcclib to add those files to a library. For example, if the file 'myliblist.txt' contains

_divsint.rel

_divuint.rel

_modsint.rel

_moduint.rel

_mulint.rel

Use

sdcclib -l libint.lib myliblist.txt

Additionally, you can instruct sdcclib to compiles the files before adding them to the library. This is achieved using the environment variables SDCCLIB_CC and/or SDCCLIB_AS. For example:

set SDCCLIB_CC=sdcc -c

sdcclib -l libint.lib myliblist.txt

To see what modules and symbols are included in the library, options -s and -m are available. For example:
sdcclib -s libint.lib
`_divsint.rel:`

`__divsint_a_1_1`

`__divsint_PARM_2`

`__divsint`
`_divuint.rel:`

`__divuint_a_1_1`

`__divuint_PARM_2`

`__divuint_reste_1_1`

`__divuint_count_1_1`

`__divuint`
`_modsint.rel:`

`__modsint_a_1_1`

`__modsint_PARM_2`

`__modsint`
`_moduint.rel:`

`__moduint_a_1_1`

`__moduint_PARM_2`

`__moduint_count_1_1`

`__moduint`
`_mulint.rel:`

`__mulint_PARM_2`

`__mulint`

If the source files are compiled using --debug, the corresponding debug information file .adb will be include in the library file as well. The library files created with sdcclib are plain text files, so they can be viewed with a text editor. It is not recommended to modify a library file created with sdcclib using a text editor, as there are file indexes numbers located across the file used by the linker to quickly locate the required module to link. Once a .rel file (as well as a .adb file) is added to a library using sdcclib, it can be safely deleted, since all the information required for linking is embedded in the library file itself. Library files created using sdcclib are used as described in the preceding sections.

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