llvm dev - Sep 2007 - [LLVMdev] profiling with llvm-gcc4?

How can I do function profiling and BB profiling with current llvm and
llvm-gcc4?

runtime/libprofile is disabled when using llvm-gcc4, but... is there any
alternative to linking with libprofile_rt.so?

How can I use llvm-prof?  is utils/profile.pl obsolete?

Thanks in advance,

josem

On Mon, 10 Sep 2007, Jose M. Moya wrote:
> How can I do function profiling and BB profiling with current llvm and
> llvm-gcc4?
>
> runtime/libprofile is disabled when using llvm-gcc4, but... is there any
> alternative to linking with libprofile_rt.so?
>
> How can I use llvm-prof?  is utils/profile.pl obsolete?
The profiling support in LLVM hasn't been used for quite a while, so it 
may have bitrotted slightly.  However, the support should basically work, 
so it shouldn't take much to bring it back to life.

-Chris

-- 
http://nondot.org/sabre/
http://llvm.org/

El lun, 10-09-2007 a las 11:55 -0700, Chris Lattner
escribió:
> The profiling support in LLVM hasn't been used for quite a while, so it
> may have bitrotted slightly.  However, the support should basically work, 
> so it shouldn't take much to bring it back to life.
Thank you, it seems working again with this simple patch:

Index: runtime/Makefile
==================================================================---
runtime/Makefile    (revision 41794)
+++ runtime/Makefile    (working copy)
@@ -11,11 +11,7 @@
 include $(LEVEL)/Makefile.config
 
 ifeq ($(LLVMGCC_MAJVERS),4)
-PARALLEL_DIRS :-install all::
-       $(Echo) "Warning: These runtime libraries only need to be built
with"
-       $(Echo) "Warning: llvm-gcc version 3. They are automatically
included"
-       $(Echo) "Warning: with llvm-gcc version 4 and beyond"
+PARALLEL_DIRS  := libprofile
 else 
 ifneq ($(wildcard $(LLVMGCC)),)
 PARALLEL_DIRS  := libdummy libprofile GC
Index: utils/profile.pl
==================================================================---
utils/profile.pl    (revision 41794)
+++ utils/profile.pl    (working copy)
@@ -62,11 +62,10 @@
 
 shift @ARGV;
 
-my $LLIPath = `which lli`;
-$LLIPath = `dirname $LLIPath`;
-chomp $LLIPath;
+my $libdir = `llvm-config --libdir`;
+chomp $libdir;
 
-my $LibProfPath = $LLIPath . "/../../Debug/lib/profile_rt.so";
+my $LibProfPath = $libdir . "/profile_rt.so";
 
 system "opt -q -f $ProfilePass $BytecodeFile -o $BytecodeFile.inst";
 system "lli -fake-argv0 '$BytecodeFile' -load $LibProfPath "
.