#9689: const_str support needed for hsc2hs in cross-compilation mode -------------------------------------+------------------------------------- Reporter: aosivitz | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.3 Component: hsc2hs | Keywords: zlib ios cross- Resolution: | compilation Operating System: | Architecture: arm Unknown/Multiple | Difficulty: Unknown Type of failure: Other | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by aosivitz): Digging a little deeper... The reason why const_str is not currently supported is that strings cannot be calculated for a cross-compiled target platform the same way numbers can. Booleans can be calculated by attempting to compile a specific program that uses the boolean value in a static array size. The compiler must calculate the array size to determine if it is non-negative. (A negative array size is a compiler error.) This trick can be extended to numbers repeatedly using them to form boolean expressions and performing a binary search. A const_str is something like #define VERSION "1.2.3" Since a string is just an array of chars, shouldn't we be able to calculate it at compile time as well? We can get the length of a string by testing for -Warray-bounds and -Werror. And then calculate the value of the array at each index. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9689#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#9689: const_str support needed for hsc2hs in cross-compilation mode -------------------------------------+------------------------------------- Reporter: aosivitz | Owner: Type: feature | Status: closed request | Milestone: Priority: normal | Version: 7.8.3 Component: hsc2hs | Keywords: zlib ios cross- Resolution: wontfix | compilation Operating System: | Architecture: arm Unknown/Multiple | Difficulty: Unknown Type of failure: Other | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by aosivitz): * status: new => closed * resolution: => wontfix Comment: Yea, I ran into that as well. zlib is the only problem package I've personally encountered, so that patch is great for me. Thanks! I'll close this, and pass on the patch to the zlib maintainer, unless you've already done so. Thanks again! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9689#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler

#9689: const_str support needed for hsc2hs in cross-compilation mode -------------------------------------+------------------------------------- Reporter: aosivitz | Owner: Type: feature | Status: closed request | Milestone: Priority: normal | Version: 7.8.3 Component: hsc2hs | Keywords: zlib ios cross- Resolution: wontfix | compilation Operating System: | Architecture: arm Unknown/Multiple | Difficulty: Unknown Type of failure: Other | Blocked By: Test Case: | Related Tickets: Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by aosivitz): Yep, it works for me (ghc 7.8.3, arm) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9689#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler