<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div><span><br></span></div><div>I'm going to close 5560 because you are right, the -lib switch did not affect the final executable. But I still don't understand the discrepancy, what bookkeeping is output for code that isn't generated? I'm not trying for a witch hunt here, I just can't see how the compiler can change the size of an object file when essentially versioned out code is compiled.<br></div><div><br></div><div>However, there is definitely something wrong with -lib if 2254 is still valid. I'll work on compiling phobos and druntime without -lib and see if I can repeat the difference in the final executable.<br></div><div><br></div><div>Also, can you explain how to use obj2asm to figure out if code is properly being generated without knowing assembly? I should say, without knowing how to demangle names in
your head as well. I am not seeing how you do it without knowing these, every trip of mine through obj2asm land is painstakingly slow, and usually ends up with me giving up understanding what's going on.</div><div><br></div><div>-Steve<br></div><div><br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;"><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Arial" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Walter Bright <walter@digitalmars.com><br><b><span style="font-weight: bold;">To:</span></b> Steve Schveighoffer <schveiguy@yahoo.com>; Discuss the phobos library for D <phobos@puremagic.com><br><b><span style="font-weight: bold;">Sent:</span></b> Tuesday, May 3, 2011 6:22 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re:
[phobos] large object files and binaries<br></font><br><meta http-equiv="x-dns-prefetch-control" content="off"><div id="yiv1255100486">
<br>
<br>
On 5/3/2011 10:30 AM, Steve Schveighoffer wrote:
<blockquote type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: arial,helvetica,sans-serif; font-size: 12pt;">
<div><span>This is not a fair response to this problem. When
the code size triples
(<a rel="nofollow" class="yiv1255100486moz-txt-link-freetext" target="_blank" href="http://d.puremagic.com/issues/show_bug.cgi?id=2254">http://d.puremagic.com/issues/show_bug.cgi?id=2254</a>) because
you add the -lib switch, and adding unit tests adds to the
size of the executable, even when unit tests are turned off
(</span><span><a rel="nofollow" class="yiv1255100486moz-txt-link-freetext" target="_blank" href="http://d.puremagic.com/issues/show_bug.cgi?id=5560">http://d.puremagic.com/issues/show_bug.cgi?id=5560</a>)
again, when adding the -lib switch, it's obvious to everyone
(but you it seems) that the -lib switch is adding bloat.
Bug 5660 proves that beyond all reasonable doubt.</span></div>
</div>
</blockquote>
<br>
Again, this is simply not relevant information. Each obj file has
bookkeeping overhead required by the ELF file format. By looking at
the object file size, you have ZERO information about the size of
code/data making it into the executable.<br>
<br>
<blockquote type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: arial,helvetica,sans-serif; font-size: 12pt;">
<div><br>
<span></span></div>
<div><span>Whether it accounts for all the added bloat, I'm not
sure. obj2asm is a great tool, but I am not an assembly
developer, I can't always decipher what's going on.</span></div>
</div>
</blockquote>
<br>
You do not need to know a single iota of assembler to understand
where size is coming from in the output of obj2asm.<br>
<br>
<blockquote type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: arial,helvetica,sans-serif; font-size: 12pt;">
<div><span> the -map switch only tells you what the compiler is
outputting,</span></div>
</div>
</blockquote>
<br>
No, it doesn't. It tells you what symbols (i.e. functions) made it
into the executable, and the size contributed by each function.<br>
<br>
<blockquote type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: arial,helvetica,sans-serif; font-size: 12pt;">
<div><span> it doesn't tell you if the output contains
unnecessary bloat.</span></div>
</div>
</blockquote>
<br>
It does if the functions in the executable don't need to be there.<br>
<br>
<blockquote type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: arial,helvetica,sans-serif; font-size: 12pt;">
<div><br>
</div>
<div>Please, at least agree to look at bug 5560, it's
irrefutable proof that the -lib switch adds bloat, it cannot
get any simpler than that.</div>
</div>
</blockquote>
<br>
I'm afraid 5560 doesn't prove that. Without looking at the obj2asm
contents of those .o files, you simply cannot conclude there is any
bloat in there or if it is nothing more than the ELF bookkeeping.<br>
<br>
<blockquote type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: arial,helvetica,sans-serif; font-size: 12pt;">
<div><br>
<span></span></div>
<div><span>-Steve<br>
</span></div>
<div><br>
<blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;">
<div style="font-family: arial,helvetica,sans-serif; font-size: 12pt;">
<div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Arial" size="2">
<hr size="1"><b><span style="font-weight: bold;">From:</span></b>
Walter Bright <a rel="nofollow" class="yiv1255100486moz-txt-link-rfc2396E" ymailto="mailto:walter@digitalmars.com" target="_blank" href="mailto:walter@digitalmars.com"><walter@digitalmars.com></a><br>
<b><span style="font-weight: bold;">To:</span></b>
Steve Schveighoffer <a rel="nofollow" class="yiv1255100486moz-txt-link-rfc2396E" ymailto="mailto:schveiguy@yahoo.com" target="_blank" href="mailto:schveiguy@yahoo.com"><schveiguy@yahoo.com></a>;
Discuss the phobos library for D
<a rel="nofollow" class="yiv1255100486moz-txt-link-rfc2396E" ymailto="mailto:phobos@puremagic.com" target="_blank" href="mailto:phobos@puremagic.com"><phobos@puremagic.com></a><br>
<b><span style="font-weight: bold;">Sent:</span></b>
Tuesday, May 3, 2011 12:57 PM<br>
<b><span style="font-weight: bold;">Subject:</span></b>
large object files and binaries<br>
</font><br>
<div id="yiv1255100486"> <br>
<br>
On 5/3/2011 7:39 AM, Steve Schveighoffer wrote:
<blockquote type="cite">
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: arial,helvetica,sans-serif; font-size: 12pt;">
<div><span>Dmd has steadily been making binaries
more bloated for the last couple years (many
times pointed out in the NG and there are
several bugzilla reports).<br>
</span></div>
</div>
</blockquote>
<br>
There are two causes of this:<br>
<br>
1. Typeinfo getting larger, and people wanting more
features in Typeinfo (like precise gc) so this will
continue to increase.<br>
<br>
2. Every phobos module imports and relies on every
other one.<br>
<br>
<br>
To find out why .o files are large, run obj2asm on it.
To find out why executables are large, compile with
the -map switch and examine the linker .map file.
<rant>AFAIK, I'm the only person who ever does
this.</rant><br>
<br>
Please, everyone. Once in a while, run obj2asm on the
library module you're developing and have a look-see
at what is coming out of the compiler.<br>
<br>
</div>
<br>
<br>
</div>
</div>
</blockquote>
</div>
</div>
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