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Re: Libtool and CUDA

From: Ralf Wildenhues
Subject: Re: Libtool and CUDA
Date: Mon, 6 Dec 2010 04:34:48 +0100
User-agent: Mutt/1.5.20 (2010-08-04)

Hello Paweł,

* Paweł Daniluk wrote on Sun, Dec 05, 2010 at 11:16:37PM CET:
> I am trying to run nvcc compiler driver through libtool, and I keep
> getting errors about compiler flags which are not supported by nvcc:
> address@hidden:~/sandbox/libdesc/libdesc/trunk$ /opt/local/bin/glibtool
> --mode=compile --tag=CC nvcc -c -m64 -arch=sm_11 -g  -DTIMER
> -Xcompiler -fno-common -I/usr/local/cuda/include/  -o
> cliques_cuda_int.lo
> glibtool: compile:  nvcc -c -m64 -arch=sm_11 -g -fno-common -DTIMER
> -I/usr/local/cuda/include/  -fno-common -DPIC -o
> .libs/cliques_cuda_int.o
> nvcc fatal   : Unknown option 'fno-common'
> This is understandable because -fno-common should be prepended with
> -Xcompiler in nvcc call. One would expect that libtool should do it
> automagically, since it has some kind of CUDA support built in.
> What am I doing wrong? Is there any method to override regular
> libtool behavior to put -Xcompiler before flags it adds?
> I'm using libtool 2.4 from MacPorts on Mac OS 10.6.5.

Does this patch fix things for you?  As far as I see, you should be
getting -fPIC passed instead of -fno-common, so it's not completely
clear that this is right, or what other changes MacPorts has done to
their glibtool code over upstream Libtool.  Please also send 'glibtool
--config' output.

OK to apply?  OK to add you to THANKS, Paweł?


    Fix nvcc PIC setting on darwin.
    * libltdl/m4/libtool.m4 (_LT_COMPILER_PIC)
    <lt_prog_compiler_pic>: Prepend -Xcompiler to nonempty variable
    setting rather than hard-coding -Xcompiler -fPIC, for darwin.
    * NEWS, THANKS: Update.
    Report by Paweł Daniluk.

diff --git a/NEWS b/NEWS
index 1679c58..d8fc3ea 100644
--- a/NEWS
+++ b/NEWS
@@ -18,6 +18,7 @@ New in 2.4.2 2010-12-??: git version 2.4.1a, Libtool team:
     not available) works again.  Regression introduced in v2.2.6-39-g9c3d4d8.
   - The bug that leaked developer tool paths into the release tarballs
     from ./bootstrap is fixed.
+  - Improved support for the Cuda Compiler Driver (nvcc) on Darwin.
 * Important incompatible changes:
diff --git a/libltdl/m4/libtool.m4 b/libltdl/m4/libtool.m4
index 99d66bb..5f18dcb 100644
--- a/libltdl/m4/libtool.m4
+++ b/libltdl/m4/libtool.m4
@@ -4240,7 +4240,9 @@ m4_if([$1], [CXX], [
     case $cc_basename in
     nvcc*) # Cuda Compiler Driver 2.2
       _LT_TAGVAR(lt_prog_compiler_wl, $1)='-Xlinker '
-      _LT_TAGVAR(lt_prog_compiler_pic, $1)='-Xcompiler -fPIC'
+      if test -n "$_LT_TAGVAR(lt_prog_compiler_pic, $1)"; then
+        _LT_TAGVAR(lt_prog_compiler_pic, $1)="-Xcompiler 
$_LT_TAGVAR(lt_prog_compiler_pic, $1)"
+      fi

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