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Fix bug in like terms collection in expression simplification Like term collection would lose the actual "variable" part of the term if the second term collected happened to have no coefficient. This would cause the expression to take the value of the calculated coefficient which is obviously wrong. Thanks to hider <stego@satx.rr.com> for reporting the bug and providing a proper test case. Observation: this bug has been present since the first pre-release of lwtools 3.0 when the algebraic expression system was introduced. Apparently people tend not to create expressions that trigger the like terms handler. The specific conditions require the symbol to be undefined and the second operand to the addition has to have no coefficient so it's likely a fairly rare scenario. Still, it is somewhat surprising that nobody tripped on it before now.
author William Astle <lost@l-w.ca>
date Mon, 23 Jan 2017 22:58:36 -0700
parents fc166b3bbae3
children
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>Chapter 5. Libraries and LWAR</H1
><P
>LWTOOLS also includes a tool for managing libraries. These are analogous to
the static libraries created with the "ar" tool on POSIX systems. Each library
file contains one or more object files. The linker will treat the object
files within a library as though they had been specified individually on
the command line except when resolving external references. External references
are looked up first within the object files within the library and then, if
not found, the usual lookup based on the order the files are specified on
the command line occurs.</P
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>The tool for creating these libary files is called LWAR.</P
><DIV
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><A
NAME="AEN1005"
>5.1. Command Line Options</A
></H1
><P
>The binary for LWAR is called "lwar". Note that the binary is in lower
case. The options lwar understands are listed below. For archive manipulation
options, the first non-option argument is the name of the archive. All other
non-option arguments are the names of files to operate on.</P
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><DT
><CODE
CLASS="OPTION"
>--add</CODE
>, <CODE
CLASS="OPTION"
>-a</CODE
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><DD
><P
>This option specifies that an archive is going to have files added to it.
If the archive does not already exist, it is created. New files are added
to the end of the archive.</P
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><DT
><CODE
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>--create</CODE
>, <CODE
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>-c</CODE
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>This option specifies that an archive is going to be created and have files
added to it. If the archive already exists, it is truncated.</P
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><DT
><CODE
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>--merge</CODE
>, <CODE
CLASS="OPTION"
>-m</CODE
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><DD
><P
>If specified, any files specified to be added to an archive will be checked
to see if they are archives themselves. If so, their constituent members are
added to the archive. This is useful for avoiding archives containing archives.</P
></DD
><DT
><CODE
CLASS="OPTION"
>--list</CODE
>, <CODE
CLASS="OPTION"
>-l</CODE
></DT
><DD
><P
>This will display a list of the files contained in the archive.</P
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><DT
><CODE
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>--debug</CODE
>, <CODE
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>-d</CODE
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>This option increases the debugging level. It is only useful for LWTOOLS
developers.</P
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>--help</CODE
>, <CODE
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>-?</CODE
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><P
>This provides a listing of command line options and a brief description
of each.</P
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><DT
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>--usage</CODE
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>This will display a usage summary
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>This will display the version of LWLINK.
of each.</P
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