[llvm-commits] [llvm-gcc-4.2] r55909 - /llvm-gcc-4.2/trunk/README.LLVM

[Anton Korobeynikov]

Author: asl
Date: Mon Sep  8 09:37:03 2008
New Revision: 55909

URL: http://llvm.org/viewvc/llvm-project?rev=55909&view=rev
Log:
We do support multilib! Clarify possible issues & fixes.

Modified:
    llvm-gcc-4.2/trunk/README.LLVM

Modified: llvm-gcc-4.2/trunk/README.LLVM
URL: http://llvm.org/viewvc/llvm-project/llvm-gcc-4.2/trunk/README.LLVM?rev=55909&r1=55908&r2=55909&view=diff

==============================================================================
--- llvm-gcc-4.2/trunk/README.LLVM (original)
+++ llvm-gcc-4.2/trunk/README.LLVM Mon Sep  8 09:37:03 2008
@@ -57,8 +57,42 @@
 //===-----------------------
 X86-64/AMD-64/EM64-T for any OS other than Darwin/Mac OS X:
 
-If you get a build error, try configuring with --disable-multilib.
+If you want to build multilib-enabled llvm-gcc (so, it will be able to generate
+32 and 64 bit executables) you need to consider you system default lib directory
+layout. 
+
+Usually, your system uses one of these layouts:
+
+I. /usr/lib    => 32 bit libraries (also in /usr/lib32)
+   /usr/lib64  => 64 bit libraries
+
+You're lucky and don't need to do anything, just proceed to usual configure
+steps.
+
+II. /usr/lib   => 64 bit libraries (also in /usr/lib64)
+    /usr/lib32 => 32 bit libraries
+
+You need to apply the following patch:
+
+<==cut==>
+--- gcc/config/i386/t-linux64
++++ gcc/config/i386/t-linux64
+@@ -6,7 +6,7 @@ SHLIB_MAPFILES = $(srcdir)/libgcc-std.ver \
+ 
+ MULTILIB_OPTIONS = m64/m32
+ MULTILIB_DIRNAMES = 64 32 
+-MULTILIB_OSDIRNAMES = ../lib64 ../lib
++MULTILIB_OSDIRNAMES = ../lib64 ../lib32
+ 
+ LIBGCC = stmp-multilib
+ INSTALL_LIBGCC = install-multilib
+<==cut==>
+
+Note, that usually you don't notice such patching with your native gcc, since
+it's done automatically by your favourite system package manager. Maybe we'll
+add some layout detection routine in the future.
 
+If you want just pure 64 bit compiler, configure with with --disable-multilib.
 
 //===-----------------------
 Darwin/Mac OS X Instructions: