• Andrej Mitrovic (20/29) May 18 2011 This is a very odd behavior I've been seeing for quite a while now with ...
• Nick Sabalausky (24/59) May 18 2011 When you run RDMD, it invokes DMD twice: The first time is *just* to fin...
• Nick Sabalausky (2/8) May 18 2011
• Nick Sabalausky (2/13) May 18 2011
• Nick Sabalausky (2/16) May 18 2011
• Andrej Mitrovic (1/1) May 18 2011 Yeah I see it now, thanks Nick. Thought it was a bug. :]

Andrej Mitrovic <none none.none> writes:

This is a very odd behavior I've been seeing for quite a while now with RDMD.
DMD doesn't recreate this behavior.

Take this module:
module test;

template Foo(T)
{
    pragma(msg, "test");
}

alias Foo!int a;
// alias Foo!double b;

void main()
{    
}

Notice one of the instantiations is commented out. $ is my prompt, > are the
printed results:

$ rdmd test.d
 test
 test

$ rdmd test.d
 test

The first time I run it, it instantiates (or evaluates) the template twice. The
second time I run rdmd, with no changes to the module, it only evaluates the
template once.

Now I comment out the second instantiation in the module and try again:
$ rdmd test.d
 test
 test
 test
 test

$ rdmd test.d
 test
 test

Quite weird.  I'm thinking this could cause some kind of slowdown. Anyone have
a clue what's going on here?

"Nick Sabalausky" <a a.a> writes:

"Andrej Mitrovic" <none none.none> wrote in message 
news:ir1tv8$12ch$1 digitalmars.com...
 This is a very odd behavior I've been seeing for quite a while now with 
 RDMD. DMD doesn't recreate this behavior.

 Take this module:
 module test;

 template Foo(T)
 {
    pragma(msg, "test");
 }

 alias Foo!int a;
 // alias Foo!double b;

 void main()
 {
 }

 Notice one of the instantiations is commented out. $ is my prompt, > are 
 the printed results:

 $ rdmd test.d
 test
 test

 $ rdmd test.d
 test

 The first time I run it, it instantiates (or evaluates) the template 
 twice. The second time I run rdmd, with no changes to the module, it only 
 evaluates the template once.

 Now I comment out the second instantiation in the module and try again:
 $ rdmd test.d
 test
 test
 test
 test

 $ rdmd test.d
 test
 test

 Quite weird.  I'm thinking this could cause some kind of slowdown. Anyone 
 have a clue what's going on here?

When you run RDMD, it invokes DMD twice: The first time is *just* to find 
out all the dependencies. Then it checks the dependencies to see if the 
executable needs to be rebuilt. If so, it passes all the dependencies to DMD 
to compile for real.

You can run it like this to see the DMD-invoking commands RDMD makes:

$ rdmd --chatty test.d

If you've changed test.d (and anything it depends on), then you'll see it 
runds dmd twice, each time with a different command.

If you haven't changed test.d (or anything it depends on), then it'll only 
run the first command: the one to find the dependencies.

You can see it without templates, too:

// test.d
import std.stdio;
pragma(msg, "Compile Time");
void main()
{
    writeln("Runtime");
}


 rdmd --chatty test.d

dmd  -v -o- "test.d" >test.d.deps
Compile Time
dmd  -of"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\test-d-A8FD055311F603E84
689B6FC07BFF23.exe" 
 -od"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\rdmd-test.d-A8FD055311F603E847689B6FC07B
F23""test.d"Compile TimeRuntime> rdmd --chatty test.ddmd  -v -o- "test.d"
>test.d.depsCompile TimeRuntime

"Nick Sabalausky" <a a.a> writes:

"Nick Sabalausky" <a a.a> wrote in message 
news:ir2750$1hd2$1 digitalmars.com...
 rdmd --chatty test.d

 dmd  -v -o- "test.d" >test.d.deps
 Compile Time
 
 md  -of"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\test-d-A8FD055311F603E84
689B6FC07BFF23.exe" 
  -od"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\rdmd-test.d-A8FD055311F603E847689B6FC07BFF23""test.d
CompileTimeRuntime> rdmd --chatty test.ddmd  -v -o- "test.d"
>test.d.depsCompileTimeRuntime>That got messed up, trying again (and note that
I'm on windows, hence the">" prompt):// test.dimport std.stdio;pragma(msg,
"Compile Time");void main(){    writeln("Runtime");}> rdmd --chatty test.ddmd 
-v -o- "test.d" >test.d.depsCompile Timedmd 
-of"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\test-d-A8FD055311F603E84
689B6FC07BFF23.exe" -od"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\rdmd-test.d-A8FD055311F60
E847689B6FC07BFF23" "test.d"Compile TimeRuntime> rdmd --chatty test.ddmd  -v
-o- "test.d" >test.d.depsCompile TimeRuntime

"Nick Sabalausky" <a a.a> writes:

"Nick Sabalausky" <a a.a> wrote in message 
news:ir27ao$1hob$1 digitalmars.com...
 "Nick Sabalausky" <a a.a> wrote in message 
 news:ir2750$1hd2$1 digitalmars.com...
 rdmd --chatty test.d

 dmd  -v -o- "test.d" >test.d.deps
 Compile Time

 
 d  -of"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\test-d-A8FD055311F603E84
689B6FC07BFF23.exe" 
  -od"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\rdmd-test.d-A8FD055311F603E847689B6FC07BFF23""test.d"Com
ileTimeRuntime>rdmd --chatty test.ddmd  -v -o- "test.d"
>test.d.depsCompileTimeRuntime>Thatgot messed up, trying again (and note that
I'm on windows, hence the">"prompt):// test.dimport std.stdio;pragma(msg,
"Compile Time");voidmain(){    writeln("Runtime");}> rdmd --chatty test.ddmd 
-v -o- "test.d">test.d.depsCompileimedmd 
-of"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\test-d-A8FD055311F603E84
689B6FC07BFF23.exe" -od"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\rdmd-test.d-A8FD055311F60
E847689B6FC07BFF23" "test.d"Compile TimeRuntime>rdmd --chatty test.ddmd  -v -o-
"test.d" >test.d.depsCompile TimeRuntime>What the hell is wrong with my NG
client? One more try:// test.dimport std.stdio;pragma(msg, "Compile Time");void
main(){    writeln("Runtime");}> rdmd --chatty test.ddmd  -v -o- "test.d"
>test.d.depsCompile Timedmd 
-of"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\test-d-A8FD055311F603E84
689B6FC07BFF23.exe" -od"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\rdmd-test.d-A8FD055311F60
E847689B6FC07BFF23" "test.d"Compile TimeRuntime> rdmd --chatty test.ddmd  -v
-o- "test.d" >test.d.depsCompile TimeRuntime

"Nick Sabalausky" <a a.a> writes:

"Nick Sabalausky" <a a.a> wrote in message 
news:ir27fa$1hs0$1 digitalmars.com...
 "Nick Sabalausky" <a a.a> wrote in message 
 news:ir27ao$1hob$1 digitalmars.com...
 "Nick Sabalausky" <a a.a> wrote in message 
 news:ir2750$1hd2$1 digitalmars.com...
 rdmd --chatty test.d

 dmd  -v -o- "test.d" >test.d.deps
 Compile Time


 
   -of"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\test-d-A8FD055311F603E84
689B6FC07BFF23.exe" 
  -od"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\rdmd-test.d-A8FD055311F603E847689B6FC07BFF23""test.d"Com
ileTimeRuntime>rdmd --chatty test.ddmd  -v -o- "test.d"
>test.d.depsCompileTimeRuntime>Thatgotmessed up, trying again (and note that
I'm on windows, hencethe">"prompt):// test.dimport std.stdio;pragma(msg,
"CompileTime");voidmain(){    writeln("Runtime");}> rdmd --chatty test.ddmd  -v
-o-"test.d">test.d.depsCompileimedmd 
-of"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\test-d-A8FD055311F603E84
689B6FC07BFF23.exe" -od"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\rdmd-test.d-A8FD055311F603E847689B6FC07B
F23""test.d"Compile TimeRuntime>rdmd --chatty test.ddmd  -v -o-
"test.d">test.d.depsCompile TimeRuntime>What the hell is wrong with my NG
client?One more try:// test.dimport std.stdio;pragma(msg, "Compile
Time");voidmain(){    writeln("Runtime");}> rdmd --chatty test.ddmd  -v -o-
"test.d">test.d.depsCompileimedmd 
-of"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\test-d-A8FD055311F603E84
689B6FC07BFF23.exe" -od"C:\DOCUME~1\NICKSA~1\LOCALS~1\Temp\.rdmd\rdmd-test.d-A8FD055311F60
E847689B6FC07BFF23" "test.d"Compile TimeRuntime>rdmd --chatty test.ddmd  -v -o-
"test.d" >test.d.depsCompile TimeRuntime>Oh well, fuck it. In any case, run
"rdmd --chatty test.d" a couple times andyou'll see.

Andrej Mitrovic <andrej.mitrovich gmail.com> writes:

Yeah I see it now, thanks Nick. Thought it was a bug. :]