[PATCH] undefined symbols; mixed architecture build

Machine:

Processor:    3.06 GHz Intel Core 2 Duo
Architecture: x86/x86_64
OS:           Mac OS X 10.6.5

Bootstrap GHC Info:

ghc --info
 [("Project name","The Glorious Glasgow Haskell Compilation System")
 ,("Project version","7.0.0.20100924")
 ,("Booter version","6.12.3")
 ,("Stage","2")
 ,("Build platform","i386-apple-darwin")
 ,("Host platform","i386-apple-darwin")
 ,("Target platform","i386-apple-darwin")
 ,("Have interpreter","YES")
 ,("Object splitting","NO")
 ,("Have native code generator","YES")
 ,("Have llvm code generator","YES")
 ,("Use archives for ghci","True")
 ,("Support SMP","YES")
 ,("Unregisterised","NO")
 ,("Tables next to code","YES")
 ,("RTS ways","l debug  thr thr_debug thr_l thr_p  dyn debug_dyn thr_dyn thr_debug_dyn")
 ,("Leading underscore","YES")
 ,("Debug on","False")
 ,("LibDir","/Library/Frameworks/GHC.framework/Versions/700/usr/lib/ghc-7.0.0.20100924")
 ,("Global Package DB","/Library/Frameworks/GHC.framework/Versions/700/usr/lib/ghc-7.0.0.20100924/package.conf.d")
 ]

Configure Info:

$./configure --build=x86_64-apple-darwin --host=x86_64-apple-darwin --target=x86_64-apple-darwin

...

Configure completed successfully.

   Building GHC version  : 7.1.20101203

   Build platform        : x86_64-apple-darwin
   Host platform         : x86_64-apple-darwin
   Target platform       : x86_64-apple-darwin

   Bootstrapping using   : /usr/bin/ghc
      which is version   : 7.0.0.20100924

   Using GCC             : /usr/bin/gcc
      which is version   : 4.2.1

   ld       : /usr/bin/ld
   Happy    : /usr/local/bin/happy (1.18.5)
   Alex     : /usr/local/bin/alex (2.3.3)
   Python   : /usr/bin/python
   Perl     : /usr/bin/perl
   dblatex  : /usr/local/bin/dblatex
   xsltproc : /usr/bin/xsltproc
   HsColour : /Users/x/.cabal/bin/HsColour

   Building DocBook HTML documentation : YES
   Building DocBook PS documentation   : YES
   Building DocBook PDF documentation  : YES

Error:

"/usr/bin/ghc"    -H32m -O  -package-conf libraries/bootstrapping.conf   -i -iutils/unlit/. -iutils/unlit/dist/build -iutils/unlit/dist/build/autogen -Iutils/unlit/dist/build -Iutils/unlit/dist/build/autogen        -no-user-package-conf -rtsopts     -c utils/unlit/unlit.c -o utils/unlit/dist/build/unlit.o
"inplace/bin/mkdirhier" utils/unlit/dist/build/tmp//.
"/usr/bin/gcc" -o utils/unlit/dist/build/tmp/unlit  -m64 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5 -fno-stack-protector              utils/unlit/dist/build/unlit.o    
ld: warning: in utils/unlit/dist/build/unlit.o, file was built for i386 which is not the architecture being linked (x86_64)
Undefined symbols:
  "_main", referenced from:
      start in crt1.10.5.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[1]: *** [utils/unlit/dist/build/tmp/unlit] Error 1
make: *** [all] Error 2

Hypothesis: The bootstrap ghc (previous one I had installed on the machine) was built for the i386 architecture and generates only i386 binaries/objects. By telling configure "--build=x86_64-apple-darwin", it assumes not only that the machine arch is x86_64 (which is true and is what I'd intended), but also that the bootstrap ghc targets x86_64 (which is false and I hadn't realized). This sort of problem seems to stem from the advent of multi-architecture machines, which has blurred the lines of native-compilation and cross-compilation.

Temporary Workaround: Have configure verify that the bootstrap ghc's arch (from ghc --info) matches the specified build arch, and spit out a sensible error if not. Here's a patch:

--- old-ghc/configure.ac	2010-12-06 01:35:13.000000000 -0500
+++ new-ghc/configure.ac	2010-12-06 01:35:13.000000000 -0500
@@ -227,6 +227,13 @@
     GHC_CONVERT_OS([$build_os], [BuildOS])
 fi
 
+# Verify that the installed (bootstrap) GHC is capable of generating code for the requested build platform.
+if test "$build" != "$bootstrap_target"
+then
+    echo "The bootstrap GHC ($bootstrap_target) cannot generate code for the given build platform ($build)"
+    exit 1
+fi
+
 if test "$host_alias" = ""
 then
     if test "${WithGhc}" != ""

Permanent Resolution: Allow ghc to directly target multiple platforms.

Trac metadata

Trac field	Value
Version	7.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	william.knop.nospam@gmail.com
Operating system
Architecture