RE: A possible bug (or a feature) : dependencies shown in dry-run but not rebuilt

[David Mentre]

Hello Mr Smith,

> -----Original Message-----
> From: Paul D. Smith [mailto:address@hidden
> Sent: mercredi 13 novembre 2002 16:17

> I tried your environment on my Debian GNU/Linux box with GNU 
> make 3.79.1
> and it worked fine for me: when I ran "make" everything was 
> rebuilt and
> when I ran "make x.o", x.o was rebuilt.

I'll try on my own debian box at home. Good idea.

> You might also try the newest version, GNU make 3.80, to see if that
> helps.

Yes, I'll try that.


> You should use "make -d" to find out why make considers them 
> up to date,
> then if you don't understand it post _selected_ sections of the output
> (it's too long to post all of it, just pick the relevant lines) and
> we'll take a look.

ok. I've done the following steps:

 - touch x.h
 - make -dr x.o

Here is (part of) the result ouput. I've marked lines that I found strange.

Updating goal targets....
Considering target file `x.o'.
 Looking for an implicit rule for `x.o'.
 Trying pattern rule with stem `x'.
 Trying implicit prerequisite `x.c'.
 Found an implicit rule for `x.o'.
[...]
   Finished prerequisites of target file `x.c'.
   Prerequisite `x.h' is newer than target `x.c'.    <<<<---- ok
   Prerequisite `perf.h' is newer than target `x.c'.
   Prerequisite `reas.h' is older than target `x.c'.
   Prerequisite `seg_desc.h' is older than target `x.c'.
   Prerequisite `info.h' is older than target `x.c'.
   Prerequisite `decoding.h' is older than target `x.c'.
   Prerequisite `misc.h' is newer than target `x.c'.
   Prerequisite `autotest.h' is older than target `x.c'.
  Must remake target `x.c'.    
  Successfully remade target file `x.c'.
 Finished prerequisites of target file `x.o'.
 Prerequisite `x.c' is older than target `x.o'. <<--- ok
No need to remake target `x.o'.    <<<<---- ?!??! ---- why?
make: `x.o' is up to date.


Do you think that it could be related to my use of "generic" rules for
compiling %.c files?


Any way, many thanks for your answers and pointers.

I'll try to investigate further and I'll inform you if I have more info.

Best regards,
d. mentré
-- 
David Mentré <address@hidden> - Research engineer
Mitsubishi Electric ITE-TCL / European Telecommunication Research Laboratory

Phone : +33 2 99 84 16 78