[GHC] #5101: GHC and GHCi use different syntax for dynamic libraries

[GHC]

#5101: GHC and GHCi use different syntax for dynamic libraries
---------------------------------------------------+------------------------
    Reporter:  mcandre                             |        Owner:                                   
        Type:  feature request                     |       Status:  infoneeded                       
    Priority:  normal                              |    Milestone:  7.2.1                            
   Component:  Compiler                            |      Version:  7.0.3                            
    Keywords:  ghc ghci dylib load compile c2hs c  |     Testcase:                                   
   Blockedby:                                      |   Difficulty:                                   
          Os:  MacOS X                             |     Blocking:                                   
Architecture:  Unknown/Multiple                    |      Failure:  Incorrect warning at compile-time
---------------------------------------------------+------------------------
Changes (by mcandre):

  * keywords:  => ghc ghci dylib load compile c2hs c
  * architecture:  x86 => Unknown/Multiple


Comment:

 {{{
 $ gcc -march=i686 -m32 -lcharm hellocharm.c
 Undefined symbols:
   "_start_charm", referenced from:
       _main in ccfP9YO9.o
   "_end_charm", referenced from:
       _main in ccfP9YO9.o
   "_vcenter_string", referenced from:
       _main in ccfP9YO9.o
   "_get_key", referenced from:
       _main in ccfP9YO9.o
 ld: symbol(s) not found
 collect2: ld returned 1 exit status
 }}}

 {{{
 $ gcc -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-version-min=10.5
 -lcharm hellocharm.c
 ld: library not found for -lcharm
 collect2: ld returned 1 exit status
 }}}

 The {{{ -search_paths_first }}} one seems to work, producing an {{{ a.out
 }}} that works just like https://github.com/mcandre/charm#readme

 {{{
 $ gcc -lcharm -Wl,-search_paths_first hellocharm.c
 wonko:charm andrew$ mate .
 wonko:charm andrew$ ./a.out
 }}}

 {{{
 $ gcc -march=i686 -m32 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx-
 version-min=10.5 -lcharm -Wl,-search_paths_first hellocharm.c
 ld: library not found for -lcharm
 collect2: ld returned 1 exit status
 }}}

 The makefile that works for me:

 https://github.com/mcandre/charm/blob/master/Makefile

 {{{
 gcc -c charm.c charm.h
 gcc -arch i386 -arch x86_64 -dynamiclib -o libcharm.dylib -flat_namespace
 charm.o
 ld: warning: in charm.o, file was built for unsupported file format which
 is not the architecture being linked (i386)
 gcc -o hellocharm hellocharm.c -Wall -I/usr/include -L. -lcharm
 }}}

 Apple does a poor job explaining how to create dylibs, so I don't expect
 my makefile to be the best.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5101#comment:5>
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