Hello,
I'm researching the use of Haskell to replace some perl scripts (in a web app).
The app is deployed with a webhosting provider.
CGI scripts can be executed => I can use Haskell. I've tried some
hello world cgi scripts, compiled them on the same linux
the hosting company uses and deployed them. It worked!
But I would like to implement a search feature for the website. For
Java/php/perl there 's lucene.
For haskell there 's holumbus. Unfortunately, sqlite is a requirement
for holumbus. It is not installed at the server of the
hosting company.
Is it possible to staticly link the sqlite3 library using ghc ?
And are there other lucene like libs available like holumbus for haskell ?
thanks in advance,
Pieter
--
Pieter Laeremans
pieter:
Hello,
I'm researching the use of Haskell to replace some perl scripts (in a web app). The app is deployed with a webhosting provider.
CGI scripts can be executed => I can use Haskell. I've tried some hello world cgi scripts, compiled them on the same linux the hosting company uses and deployed them. It worked!
But I would like to implement a search feature for the website. For Java/php/perl there 's lucene. For haskell there 's holumbus. Unfortunately, sqlite is a requirement for holumbus. It is not installed at the server of the hosting company.
Is it possible to staticly link the sqlite3 library using ghc ?
Yes, it is entirely possible to statically link entire CGI apps. For example, this simple program, import Database.SQLite main = print "hey, test this" when compiled as $ ghc A.hs --make is dynamically linked against: $ ldd A A: Start End Type Open Ref GrpRef Name 0000000000000000 0000000000000000 exe 1 0 0 A 0000000041a85000 0000000041ee5000 rlib 0 1 0 /usr/local/lib/libsqlite3.so.9.0 0000000049b04000 0000000049f1d000 rlib 0 1 0 /usr/lib/libm.so.2.3 0000000042213000 000000004264f000 rlib 0 1 0 /usr/local/lib/libgmp.so.7.0 0000000047d0e000 00000000481e0000 rlib 0 1 0 /usr/lib/libc.so.42.0 0000000047900000 0000000047900000 rtld 0 1 0 /usr/libexec/ld.so Now, we can just pass some linker flags through to statically link this lot, $ ghc A.hs --make -optl-static -no-recomp $ ldd A ldd: A: not a dynamic executable $ file A A: ELF 64-bit LSB executable, AMD64, version 1, for OpenBSD, statically linked, not stripped I've added this information to the web programming FAQ, haskell.org/haskellwiki/Practical_web_programming_in_Haskell#Deploying_statically_linked_applications Note it also works for fastcgi, which when combined with Haskell's lightweight threads, makes a good option for performance-oriented web apps. -- Don
On 02/06/2008, at 5:26 AM, Don Stewart wrote:
pieter: Yes, it is entirely possible to statically link entire CGI apps.
You might want to watch out for a bug in GHC 6.8.2 that means GHC's "- static" flag doesn't work. (At least for me, at least on Debian: the "- lpthread" flag is passed before the "-lrt" one, and symbols are left unresolved as a result.) Apparently the near-to-release 6.8.3 will fix this issue. Presumably dons is using a more recent GHC than 6.8.2, or other (BSD?) platforms are not affected. Note also you may have to tweak sundry .cabal files to add "extra- libraries" fields. As an example, I added this to HSQL's PostgreSQL backend to get it to statically link: extra-libraries: pq, crypt, pthread (If anyone cares you need to build PostgreSQL without kerberos as that doesn't seem to statically link any more.) cheers peter -- http://peteg.org/
peteg42:
On 02/06/2008, at 5:26 AM, Don Stewart wrote:
pieter: Yes, it is entirely possible to statically link entire CGI apps.
You might want to watch out for a bug in GHC 6.8.2 that means GHC's "- static" flag doesn't work. (At least for me, at least on Debian: the "- lpthread" flag is passed before the "-lrt" one, and symbols are left unresolved as a result.) Apparently the near-to-release 6.8.3 will fix this issue.
Presumably dons is using a more recent GHC than 6.8.2, or other (BSD?) platforms are not affected.
Yeah, that's the case.
Note also you may have to tweak sundry .cabal files to add "extra- libraries" fields. As an example, I added this to HSQL's PostgreSQL backend to get it to statically link:
extra-libraries: pq, crypt, pthread
(If anyone cares you need to build PostgreSQL without kerberos as that doesn't seem to statically link any more.)
Hey Pete, Can you add these caveats to the wiki page? haskell.org/haskellwiki/Practical_web_programming_in_Haskell#Deploying_statically_linked_applications
participants (3)
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Don Stewart -
Peter Gammie -
Pieter Laeremans