Re: update dependency and signatures.dblite after biilding

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Of course a better scanner is slower.. as would generating the .d files
from the compiler..

That said, the scanner I pointed you at may have room for improvement in
terms of performance.

Honestly.. IMHO using #define HEADER "xyz.h" and then #include HEADER is
not great practice.

For your code how many instances of a header file defined by a macro are
there?
Is it one, which is used all over the place?
Or many, used many places?

On Fri, Jun 6, 2025 at 10:20=E2=80=AFAM =E4=BA=8E <[email protected]> wrote:

>
>  Well, this is why Bill advised trying the C Conditional Scanner, which
> *does* know how to handle preprocessor instructions of this sort.  It's
> still a bit of a work in progress (there are some questions about
> recursion, in particular), which is why it's not the default.  Were you
> able to try that out?
>
> I have try it, as Bill and Mats said, CConditionalScanner can resolve my
> problem.
> And I find that after set CConditionalScanner, the building time change
> from 5min to 8min.
> ---- Replied Message ----
> From Mats Wichmann<[email protected]> <undefined>
> Date 6/6/2025 23:54
> To =E4=BA=8E<[email protected]> <[email protected]>
> Cc SCons users mailing list<[email protected]> <[email protected]=
>
> Subject Re: [Scons-users] update dependency and signatures.dblite after
> biilding
> On 6/6/25 09:46, =E4=BA=8E wrote:
>
>
> =E2=80=8D=E2=80=8DMy problem:
> =E2=80=8D
>
> In my project, there are those code in some source files,
>
> #defineFOO_HEADER "foo.h"
> #includeFOO_HEADER
>
> =E2=80=8D=E2=80=8D
>
> and the files are independent module, I can't modify them.
>
> the scons-user.pdf said, scons the built-in C scanner is unable to
> extract the implicit dependency on a header file.
> So I create .d file for every source file, and parse dependencies
> from .d, and then add dependency by Depends function.
>
> =E2=80=8D=E2=80=8DAnd then, there is a new problem, when there are no .d,=
 (for
> example the first building or dependencies are changed), I need to
> build project with two times, and then I can push all the
> dependencies into signature.
>
>
> yes, this isn't ideal - if the dependencies can't be automatically
> determined, you have both a first-run problem and no detection of changes=
.
>
>
> =E2=80=8D=E2=80=8D
> So I consider that whether could I update all the dependencies into
> signature with just one building.
> that is my problem.
>
> Well, this is why Bill advised trying the C Conditional Scanner, which
> *does* know how to handle preprocessor instructions of this sort.  It's
> still a bit of a work in progress (there are some questions about
> recursion, in particular), which is why it's not the default.  Were you
> able to try that out?
>
> _______________________________________________
> Scons-users mailing list
> [email protected]
> https://pairlist4.pair.net/mailman/listinfo/scons-users
>

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<div dir=3D"ltr"><div>Of course a better scanner is slower.. as would gener=
ating the .d files from the compiler..</div><div><br></div><div>That said, =
the scanner I pointed you at may have room for improvement in terms of perf=
ormance.</div><div><br></div><div>Honestly.. IMHO using #define=C2=A0HEADER=
=C2=A0&quot;xyz.h&quot; and then #include HEADER is not great practice.</di=
v><div><br></div><div>For your code how many instances of a header file def=
ined=C2=A0by a macro are there?</div><div>Is it one, which is used all over=
 the place?</div><div>Or many, used many places?</div></div><br><div class=
=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr=
">On Fri, Jun 6, 2025 at 10:20=E2=80=AFAM =E4=BA=8E &lt;<a href=3D"mailto:y=
[email protected]">[email protected]</a>&gt; wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex"><div><div style=3D"font-family:=E5=BE=AE=E8=BD=
=AF=E9=9B=85=E9=BB=91"><div><br></div><div>=C2=A0Well, this is why Bill adv=
ised trying the C Conditional Scanner, which <br>*does* know how to handle =
preprocessor instructions of this sort.=C2=A0 It&#39;s <br>still a bit of a=
 work in progress (there are some questions about <br>recursion, in particu=
lar), which is why it&#39;s not the default.=C2=A0 Were you <br>able to try=
 that out?=C2=A0</div><div style=3D"text-indent:2em"><br></div><div style=
=3D"text-indent:2em">I have try it, as Bill and Mats said, CConditionalScan=
ner can resolve my problem.</div><div style=3D"text-indent:2em">And I find =
that after set CConditionalScanner, the building time change from 5min to 8=
min.</div><div id=3D"m_3080952570899099365ntes-pcmac-signature" style=3D"fo=
nt-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91"><div style=3D"font-size:14p=
x;padding:0px;margin:0px"></div></div></div><div style=3D"padding-top:1px;p=
adding-bottom:1px;font-family:=E5=BE=AE=E8=BD=AF=E9=9B=85=E9=BB=91"><div st=
yle=3D"margin:2em 0px 1em;font-size:14px;line-height:1.25;color:rgb(120,120=
,122)">---- Replied Message ----</div><div style=3D"margin-bottom:1em;font-=
size:12px;line-height:1.25;color:rgb(35,35,36);padding:0.5em 0.25em;border-=
radius:0.67em;background-color:rgb(240,240,240)"><table width=3D"100%" cell=
padding=3D"0" cellspacing=3D"9" border=3D"0" id=3D"m_3080952570899099365nte=
s_editor_table_10010"><tbody><tr><td valign=3D"top" style=3D"width:4.25em;f=
ont-size:12px;line-height:1.25;color:rgb(120,120,122)">From</td><td valign=
=3D"top" style=3D"font-size:12px;line-height:1.25;color:rgb(35,35,36);word-=
break:break-all"><a style=3D"color:rgb(48,97,242);text-decoration:none" hre=
f=3D"mailto:undefined" target=3D"_blank">Mats Wichmann&lt;[email protected]&=
gt;</a></td></tr><tr><td valign=3D"top" style=3D"width:4.25em;font-size:12p=
x;line-height:1.25;color:rgb(120,120,122)">Date</td><td valign=3D"top" styl=
e=3D"font-size:12px;line-height:1.25;color:rgb(35,35,36);word-break:break-a=
ll">6/6/2025 23:54</td></tr><tr><td valign=3D"top" style=3D"width:4.25em;fo=
nt-size:12px;line-height:1.25;color:rgb(120,120,122)">To</td><td valign=3D"=
top" style=3D"font-size:12px;line-height:1.25;color:rgb(35,35,36);word-brea=
k:break-all"><a style=3D"color:rgb(48,97,242);text-decoration:none" href=3D=
"mailto:[email protected]" target=3D"_blank">=E4=BA=8E&lt;[email protected]&gt;</=
a></td></tr><tr><td valign=3D"top" style=3D"width:4.25em;font-size:12px;lin=
e-height:1.25;color:rgb(120,120,122)">Cc</td><td valign=3D"top" style=3D"fo=
nt-size:12px;line-height:1.25;color:rgb(35,35,36);word-break:break-all"><a =
style=3D"color:rgb(48,97,242);text-decoration:none" href=3D"mailto:scons-us=
[email protected]" target=3D"_blank">SCons users mailing list&lt;scons-users@sc=
ons.org&gt;</a></td></tr><tr><td valign=3D"top" style=3D"width:4.25em;font-=
size:12px;line-height:1.25;color:rgb(120,120,122)">Subject</td><td valign=
=3D"top" style=3D"font-size:12px;line-height:1.25;color:rgb(35,35,36);word-=
break:break-all">Re: [Scons-users] update dependency and signatures.dblite =
after biilding</td></tr></tbody></table></div>On 6/6/25 09:46, =E4=BA=8E wr=
ote:<br><blockquote><br> =E2=80=8D=E2=80=8DMy problem:<br> =E2=80=8D<br> <b=
r>     In my project, there are those code in some source files,<br> <br>  =
   #defineFOO_HEADER &quot;foo.h&quot;<br>     #includeFOO_HEADER<br> <br> =
=E2=80=8D=E2=80=8D<br> <br>     and the files are independent module, I can=
&#39;t modify them.<br> <br>     the scons-user.pdf said, scons the built-i=
n C scanner is unable to<br>     extract the implicit dependency on a heade=
r file.<br>     So I create .d file for every source file, and parse depend=
encies<br>     from .d, and then add dependency by Depends function.<br> <b=
r>     =E2=80=8D=E2=80=8DAnd then, there is a new problem, when there are n=
o .d, (for<br>     example the first building or dependencies are changed),=
 I need to<br>     build project with two times, and then I can push all th=
e<br>     dependencies into signature.<br></blockquote><br>yes, this isn&#3=
9;t ideal - if the dependencies can&#39;t be automatically <br>determined, =
you have both a first-run problem and no detection of changes.<br><br><bloc=
kquote><br>     =E2=80=8D=E2=80=8D<br>     So I consider that whether could=
 I update all the dependencies into<br>     signature with just one buildin=
g.<br>     that is my problem.<br> <br></blockquote>Well, this is why Bill =
advised trying the C Conditional Scanner, which <br>*does* know how to hand=
le preprocessor instructions of this sort.=C2=A0 It&#39;s <br>still a bit o=
f a work in progress (there are some questions about <br>recursion, in part=
icular), which is why it&#39;s not the default.=C2=A0 Were you <br>able to =
try that out?<br><br></div></div>__________________________________________=
_____<br>
Scons-users mailing list<br>
<a href=3D"mailto:[email protected]" target=3D"_blank">Scons-users@scon=
s.org</a><br>
<a href=3D"https://pairlist4.pair.net/mailman/listinfo/scons-users" rel=3D"=
noreferrer" target=3D"_blank">https://pairlist4.pair.net/mailman/listinfo/s=
cons-users</a><br>
</blockquote></div>

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