> Date: Thu, 21 Oct 2010 15:04:20 -0400
> From: Mike Shal <mar...@gmail.com>
> Cc: Bug-make@gnu.org
>
> I don't see why Michael's example should fail, but I can reproduce the
> behavior with 3.81 and 3.82.
It fails because, depending on the timing, app1.o may or may not exist
when Make comes to check it. Here's the relevant portion of "make -d"
output:
- Considering target file `app1.o'.
- Still updating file `app1.o'.
Finished prerequisites of target file `app1'.
The prerequisites of `app1' are being made.
-Live child 0x652d40 (lib.a) PID 1894
-Live child 0x651590 (app1.o) PID 1893
-Reaping winning child 0x652d40 PID 1894
-Removing child 0x652d40 PID 1894 from chain.
-Released token for child 0x652d40 (lib.a).
-Live child 0x651590 (app1.o) PID 1893
+Live child 0x652d60 (lib.a) PID 1948
+Reaping winning child 0x652d60 PID 1948
+Removing child 0x652d60 PID 1948 from chain.
Considering target file `app1'.
Considering target file `app1.c'.
File `app1.c' was considered already.
Considering target file `lib.a'.
File `lib.a' was considered already.
- Considering target file `app1.o'.
- Still updating file `app1.o'.
- Finished prerequisites of target file `app1'.
-The prerequisites of `app1' are being made.
-Live child 0x651590 (app1.o) PID 1893
-Reaping winning child 0x651590 PID 1893
-Removing child 0x651590 PID 1893 from chain.
-Considering target file `app1'.
- Considering target file `lib.a'.
- File `lib.a' was considered already.
- Considering target file `app1.o'.
- File `app1.o' was considered already.
+ Pruning file `app1.o'.
Finished prerequisites of target file `app1'.
- Prerequisite `app1.o' is newer than target `app1'. <<<<<<<<<<<<
+ Prerequisite `app1.o' of target `app1' does not exist. <<<<<<<<<<<<
I think Make doesn't really use the rule that was supposed to be used
to rebuild app1. It uses some builtin rule instead. To see that, try
"make -j2 -r", and you will see this (remember: app1.o does not exist
at this point):
Updating goal targets....
Considering target file `app1'.
Looking for an implicit rule for `app1'.
Trying pattern rule with stem `1'.
Trying implicit prerequisite `app1.o'.
Trying pattern rule with stem `1'.
Trying implicit prerequisite `app1.o'.
Looking for a rule with intermediate file `app1.o'.
Avoiding implicit rule recursion.
Trying pattern rule with stem `app1'.
Trying implicit prerequisite `src/app1.c'.
Trying pattern rule with stem `app1'.
Trying implicit prerequisite `src/app1.c'.
Looking for a rule with intermediate file `src/app1.c'.
Avoiding implicit rule recursion.
Avoiding implicit rule recursion.
No implicit rule found for `app1'. <<<<<<<<<<<<<<<
Finished prerequisites of target file `app1'.
No need to remake target `app1'. <<<<<<<<<<<<<<<
make: Nothing to be done for `app1'.
As you see, either it doesn't realize that app1 depends on lib.a, or
that lib.a depends on lib.h via a.o and b.o.
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