James Mitchell wrote:
I'm writing an interface to Berkeley DB, and, while I
can link to my wrapper library fine from C, I can't
seem to do it successfully from GHC.
I think you are trying to link agains an Microsoft Visual C++ library. You need to convert it first to a mingw compatible library and you can do that using a special utitility called. "reimp.exe". You can get it by downloading the wxHaskell sources -- it is in the "bin" directory.
when you do "reimp foo.lib", it will create "libfoo.a" and "foo.def" that can be linked with ghc stuff.
I hope this helps, -- Daan Leijen
My first attempt was: D:\src\dm>ghc -fffi test.hs db.lib libdb43.lib compilation IS NOT required Warning: .drectve `/DEFAULTLIB:"libcp" /DEFAULTLIB:"LIBC" /DEFAULTLIB:"OLDNAMES" /EXPORT:_db_info_status_pos,DATA /EXPOR T:_db_info_struct_size,DATA /EXPORT:[EMAIL PROTECTED] /EXPORT:[EMAIL PROTECTED] /EXPORT:[EMAIL PROTECTED] /EXPORT:[EMAIL PROTECTED] /EXPORT:_db_re [EMAIL PROTECTED] /EXPORT:_db_info_mode_pos,DATA /EXPORT:_db_info_out_data_pos,DATA /EXPORT:_db_info_in_data_length_pos,DATA /EXPOR T:_db_info_pathname_pos,DATA /EXPORT:_db_info_error_pos,DATA /EXPORT:_db_info_in_data_pos,DATA /EXPORT:_db_info_key_leng th_pos,DATA /EXPORT:_db_info_key_pos,DATA /EXPORT:_db_info_out_data_length_pos,DATA /EXPORT:_db_info_db_name_pos,DATA ' unrecognized db.lib(Release/berk_db.obj)(.text+0xd):berk_db.cpp: undefined reference to [EMAIL PROTECTED]@Z' db.lib(Release/berk_db.obj)(.text+0xc):berk_db.cpp: undefined reference to `_except_list' db.lib(Release/berk_db.obj)(.text+0x14):berk_db.cpp: undefined reference to `_except_list' db.lib(Release/berk_db.obj)(.text+0x5d):berk_db.cpp: undefined reference to [EMAIL PROTECTED]@Z' db.lib(Release/berk_db.obj)(.text+0x7e):berk_db.cpp: undefined reference to `_except_list' db.lib(Release/berk_db.obj)(.text+0x6c):berk_db.cpp: undefined reference to [EMAIL PROTECTED]@Z' db.lib(Release/berk_db.obj)(.text+0x78):berk_db.cpp: undefined reference to [EMAIL PROTECTED]@Z'
... where db.lib is my wrapper library. Taking a hint from the compiler defaultlib directives, I then did the following:
D:\src\dm>ghc -fffi test.hs db.lib libdb43.lib libc.lib libcp.lib oldnames.lib compilation IS NOT required libc.lib(build/intel/st_obj/crt0.obj)(.text+0x0): In function `mainCRTStartup': f:\vs70builds\9466: multiple definition of `mainCRTStartup' D:/GHC/GHC-6.2.2/gcc-lib/crt2.o(.text+0x240):crt1.c: first defined here Warning: .drectve `/DEFAULTLIB:"libcp" /DEFAULTLIB:"LIBC" /DEFAULTLIB:"OLDNAMES" /EXPORT:_db_info_status_pos,DATA /EXPOR T:_db_info_struct_size,DATA /EXPORT:[EMAIL PROTECTED] /EXPORT:[EMAIL PROTECTED] /EXPORT:[EMAIL PROTECTED] /EXPORT:[EMAIL PROTECTED] /EXPORT:_db_re [EMAIL PROTECTED] /EXPORT:_db_info_mode_pos,DATA /EXPORT:_db_info_out_data_pos,DATA /EXPORT:_db_info_in_data_length_pos,DATA /EXPOR T:_db_info_pathname_pos,DATA /EXPORT:_db_info_error_pos,DATA /EXPORT:_db_info_in_data_pos,DATA /EXPORT:_db_info_key_leng th_pos,DATA /EXPORT:_db_info_key_pos,DATA /EXPORT:_db_info_out_data_length_pos,DATA /EXPORT:_db_info_db_name_pos,DATA ' unrecognized Warning: .drectve `/merge:.CRT=.data /defaultlib:kernel32.lib /disallowlib:libcd.lib /disallowlib:libcmt.lib /disallowli b:libcmtd.lib /disallowlib:msvcrt.lib /disallowlib:msvcrtd.lib ' unrecognized Warning: .drectve `/MERGE:.rtc=.rdata ' unrecognized
I assume that the warnings are no problem, but I can't figure out how to get rid of the duplicate "mainCRTStartup" symbol.
This's really vexing me, as there are a number of things such as gdb support that would go a long way towards making Haskell more useable for general purpose applications (instead of the "hard" calculations at which it excels), but I just can't seem to make it work.
thanks in advance,
James
|-----------------------------------------------| | James Mitchell | http://www.jimdesu.us | |-----------------------------------------------| |When the shoe fits, the foot is forgotten; when| |the belt fits, the belly is forgotten; when the| |heart is right, "for" and "against" are | |forgotten. -- Chuang Tzu | |-----------------------------------------------|
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