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><H1
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CLASS="SECT1"
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CLASS="SECT1"
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><A
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><A
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NAME="CONFLICTS-AND-CONSTRAINTS">Conflicts and constraints</H1
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NAME="CONFLICTS-AND-CONSTRAINTS">Conflicts and constraints</H1
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><P
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><P
|
>Configuration options are not completely independent. For example
|
>Configuration options are not completely independent. For example
|
the C library's <TT
|
the C library's <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>strtod()</TT
|
>strtod()</TT
|
> and <TT
|
> and <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>atof()</TT
|
>atof()</TT
|
>
|
>
|
functions rely on the math library package to provide certain functionality. If the math library package is removed then the C
|
functions rely on the math library package to provide certain functionality. If the math library package is removed then the C
|
library can no longer provide these functions. Each package describes constraints like these in CDL <SPAN
|
library can no longer provide these functions. Each package describes constraints like these in CDL <SPAN
|
CLASS="emphasis"
|
CLASS="emphasis"
|
><I
|
><I
|
CLASS="EMPHASIS"
|
CLASS="EMPHASIS"
|
>"requires"</I
|
>"requires"</I
|
></SPAN
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></SPAN
|
> properties. If a constraint is not satisfied, then the configuration contains a conflict. For any given conflict there can
|
> properties. If a constraint is not satisfied, then the configuration contains a conflict. For any given conflict there can
|
be several resolution options. For example, it would be possible to add the math library package back to the
|
be several resolution options. For example, it would be possible to add the math library package back to the
|
configuration, or to disable the <TT
|
configuration, or to disable the <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>strtod()</TT
|
>strtod()</TT
|
> and <TT
|
> and <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>atof()</TT
|
>atof()</TT
|
> functions.</P
|
> functions.</P
|
><P
|
><P
|
>The <SPAN
|
>The <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> configuration tools will report any conflicts in the current configuration. If there are any such conflicts
|
> configuration tools will report any conflicts in the current configuration. If there are any such conflicts
|
then the configuration is usually unsafe and it makes no sense to build and run <SPAN
|
then the configuration is usually unsafe and it makes no sense to build and run <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> in such circumstances. In fact,
|
> in such circumstances. In fact,
|
any attempt at building <SPAN
|
any attempt at building <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> is likely to fail. In exceptional cases it is possible to override this by using e.g. the
|
> is likely to fail. In exceptional cases it is possible to override this by using e.g. the
|
<TT
|
<TT
|
CLASS="OPTION"
|
CLASS="OPTION"
|
>--ignore-errors</TT
|
>--ignore-errors</TT
|
> qualifier with ecosconfig. </P
|
> qualifier with ecosconfig. </P
|
><P
|
><P
|
>Many constraints are fairly simple in nature, and the configuration tools contain an inference engine which can
|
>Many constraints are fairly simple in nature, and the configuration tools contain an inference engine which can
|
resolve the associated conflicts automatically. For example, if the math library package is removed then the
|
resolve the associated conflicts automatically. For example, if the math library package is removed then the
|
inference engine can resolve the resulting conflict by disabling the configuration option for <TT
|
inference engine can resolve the resulting conflict by disabling the configuration option for <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>strtod()</TT
|
>strtod()</TT
|
> and <TT
|
> and <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>atof()</TT
|
>atof()</TT
|
>. All
|
>. All
|
such changes will be reported. Sometimes the inference engine cannot resolve a conflict, for example it is not
|
such changes will be reported. Sometimes the inference engine cannot resolve a conflict, for example it is not
|
allowed to override a change that has been made explicitly by the user. Sometimes it will find a solution which does
|
allowed to override a change that has been made explicitly by the user. Sometimes it will find a solution which does
|
not match the application's requirements. </P
|
not match the application's requirements. </P
|
><P
|
><P
|
>A typical session involving conflicts would look something like this:
|
>A typical session involving conflicts would look something like this:
|
<TABLE
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<TABLE
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BORDER="5"
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BORDER="5"
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BGCOLOR="#E0E0F0"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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WIDTH="70%"
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><TR
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><TR
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><TD
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><TD
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><PRE
|
><PRE
|
CLASS="SCREEN"
|
CLASS="SCREEN"
|
>$ ecosconfig new pid</PRE
|
>$ ecosconfig new pid</PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
>This creates a new configuration with the default template. For most targets this will not result in any conflicts,
|
>This creates a new configuration with the default template. For most targets this will not result in any conflicts,
|
because the default settings for the various options meet the requirements of the default template.</P
|
because the default settings for the various options meet the requirements of the default template.</P
|
><P
|
><P
|
> For some targets
|
> For some targets
|
there may be conflicts and the inference engine would come into play.
|
there may be conflicts and the inference engine would come into play.
|
<TABLE
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<TABLE
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BORDER="5"
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BORDER="5"
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BGCOLOR="#E0E0F0"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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WIDTH="70%"
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><TR
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><TR
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><TD
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><TD
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><PRE
|
><PRE
|
CLASS="SCREEN"
|
CLASS="SCREEN"
|
>$ ecosconfig remove libm
|
>$ ecosconfig remove libm
|
U CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, new inferred value 0
|
U CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, new inferred value 0
|
U CYGFUN_LIBC_strtod, new inferred value 0
|
U CYGFUN_LIBC_strtod, new inferred value 0
|
U CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, new inferred value 0 </PRE
|
U CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, new inferred value 0 </PRE
|
></TD
|
></TD
|
></TR
|
></TR
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></TABLE
|
></TABLE
|
>
|
>
|
ecosconfig reports that this change caused three conflicts, all in the C library. The inference engine was able to
|
ecosconfig reports that this change caused three conflicts, all in the C library. The inference engine was able to
|
resolve all the conflicts and update the relevant configuration options accordingly. </P
|
resolve all the conflicts and update the relevant configuration options accordingly. </P
|
><P
|
><P
|
>To suppress the inference engine <TT
|
>To suppress the inference engine <TT
|
CLASS="OPTION"
|
CLASS="OPTION"
|
>--no-resolve</TT
|
>--no-resolve</TT
|
> can be used:
|
> can be used:
|
<TABLE
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<TABLE
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BORDER="5"
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BORDER="5"
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BGCOLOR="#E0E0F0"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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WIDTH="70%"
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><TR
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><TR
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><TD
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><TD
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><PRE
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><PRE
|
CLASS="SCREEN"
|
CLASS="SCREEN"
|
>$ ecosconfig new pid
|
>$ ecosconfig new pid
|
$ ecosconfig --no-resolve remove libm
|
$ ecosconfig --no-resolve remove libm
|
C CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM </PRE
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM </PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
>
|
>
|
Three unresolved conflicts are reported.</P
|
Three unresolved conflicts are reported.</P
|
><P
|
><P
|
>The <B
|
>The <B
|
CLASS="COMMAND"
|
CLASS="COMMAND"
|
>check</B
|
>check</B
|
> command can be used to get the current state of the
|
> command can be used to get the current state of the
|
configuration, and the <TT
|
configuration, and the <TT
|
CLASS="OPTION"
|
CLASS="OPTION"
|
>--verbose</TT
|
>--verbose</TT
|
> qualifier will provide additional information: </P
|
> qualifier will provide additional information: </P
|
><TABLE
|
><TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="SCREEN"
|
CLASS="SCREEN"
|
>$ ecosconfig --srcdir /home/bartv/ecc/ecc --verbose check
|
>$ ecosconfig --srcdir /home/bartv/ecc/ecc --verbose check
|
Target: pid
|
Target: pid
|
Template: default
|
Template: default
|
Removed:
|
Removed:
|
CYGPKG_LIBM
|
CYGPKG_LIBM
|
3 conflict(s):
|
3 conflict(s):
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM
|
Possible solution:
|
Possible solution:
|
CYGFUN_LIBC_strtod -> 0
|
CYGFUN_LIBC_strtod -> 0
|
CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT -> 0
|
CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT -> 0
|
C CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, "requires" constraint not satisfied: CYGPKG_LIBM
|
Possible solution:
|
Possible solution:
|
CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT -> 0
|
CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT -> 0
|
C CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, "requires" constraint not satisfied: CYGPKG_LIBM
|
Possible solution:
|
Possible solution:
|
CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT -> 0 </PRE
|
CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT -> 0 </PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
><P
|
><P
|
>If the proposed solutions are acceptable, the resolve command can be used to apply them:
|
>If the proposed solutions are acceptable, the resolve command can be used to apply them:
|
<TABLE
|
<TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="SCREEN"
|
CLASS="SCREEN"
|
>$ ecosconfig resolve
|
>$ ecosconfig resolve
|
U CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, new inferred value 0
|
U CYGSEM_LIBC_STDIO_SCANF_FLOATING_POINT, new inferred value 0
|
U CYGFUN_LIBC_strtod, new inferred value 0
|
U CYGFUN_LIBC_strtod, new inferred value 0
|
U CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, new inferred value 0 </PRE
|
U CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT, new inferred value 0 </PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
></P
|
></P
|
><P
|
><P
|
>The current configuration is again conflict-free and it is possible to generate a build tree. The <TT
|
>The current configuration is again conflict-free and it is possible to generate a build tree. The <TT
|
CLASS="OPTION"
|
CLASS="OPTION"
|
>--quiet</TT
|
>--quiet</TT
|
> qualifier can
|
> qualifier can
|
be used to suppress the change messages, if desired.</P
|
be used to suppress the change messages, if desired.</P
|
><P
|
><P
|
>When changing individual configuration options by editing the ecos.ecc file (as described below), the resulting
|
>When changing individual configuration options by editing the ecos.ecc file (as described below), the resulting
|
system should be checked and any problems should be resolved. For example, if CYGFUN_LIBC_strtod is
|
system should be checked and any problems should be resolved. For example, if CYGFUN_LIBC_strtod is
|
explicitly enabled in the savefile:
|
explicitly enabled in the savefile:
|
<TABLE
|
<TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="SCREEN"
|
CLASS="SCREEN"
|
>$ edit ecos.ecc
|
>$ edit ecos.ecc
|
$ ecosconfig check
|
$ ecosconfig check
|
Target: pid
|
Target: pid
|
Template: default
|
Template: default
|
Removed:
|
Removed:
|
CYGPKG_LIBM
|
CYGPKG_LIBM
|
1 conflict(s):
|
1 conflict(s):
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM
|
$ ecosconfig resolve
|
$ ecosconfig resolve
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM </PRE
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM </PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
>
|
>
|
In this case the inference engine cannot resolve the conflict automatically because that would involve changing a
|
In this case the inference engine cannot resolve the conflict automatically because that would involve changing a
|
user setting. Any attempt to generate a build tree will fail:
|
user setting. Any attempt to generate a build tree will fail:
|
<TABLE
|
<TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="SCREEN"
|
CLASS="SCREEN"
|
>$ ecosconfig --srcdir /home/bartv/ecc/ecc tree
|
>$ ecosconfig --srcdir /home/bartv/ecc/ecc tree
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM
|
Unable to generate build tree, this configuration still contains conflicts.
|
Unable to generate build tree, this configuration still contains conflicts.
|
Either resolve the conflicts or use --ignore-errors </PRE
|
Either resolve the conflicts or use --ignore-errors </PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
></P
|
></P
|
><P
|
><P
|
>It is still possible to generate a build tree:
|
>It is still possible to generate a build tree:
|
<TABLE
|
<TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="SCREEN"
|
CLASS="SCREEN"
|
>$ ecosconfig --srcdir /home/bartv/ecc/ecc --ignore-errors tree
|
>$ ecosconfig --srcdir /home/bartv/ecc/ecc --ignore-errors tree
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM
|
C CYGFUN_LIBC_strtod, "requires" constraint not satisfied: CYGPKG_LIBM
|
$ make </PRE
|
$ make </PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
>
|
>
|
In this case <SPAN
|
In this case <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> will fail to build. In other cases of unresolved conflicts <SPAN
|
> will fail to build. In other cases of unresolved conflicts <SPAN
|
CLASS="PRODUCTNAME"
|
CLASS="PRODUCTNAME"
|
>eCos</SPAN
|
>eCos</SPAN
|
> may build, but may not run. In
|
> may build, but may not run. In
|
general all conflicts should be resolved by editing the <TT
|
general all conflicts should be resolved by editing the <TT
|
CLASS="FILENAME"
|
CLASS="FILENAME"
|
>ecos.ecc</TT
|
>ecos.ecc</TT
|
> file, by letting the inference engine make appropriate
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> file, by letting the inference engine make appropriate
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changes, or by other means, before any attempt is made to build or run <SPAN
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changes, or by other means, before any attempt is made to build or run <SPAN
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>eCos</SPAN
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>eCos</SPAN
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