Re: SQLite install
Re: SQLite install
- Subject: Re: SQLite install
- From: Philip Aker <email@hidden>
- Date: Mon, 02 Jun 2008 11:22:31 -0700
On 08-06-02, at 10:24, Bruce Robertson wrote:
It's never a problem if you create an sqlite shell tool
incorporating .a output from your custom build and then embed it in
your application package. Similarly for a framework build of the
library using the @executable_path/../Frameworks install path.
Hm, could you explain that a little more?
A .a build is for statically linked libraries.
When you build the sqlite shell, if you include the dynamic library in
your build, the binary file size will be very small (~100K). That's
because it uses the functions contained in /usr/lib/libsqlite3.0.dylib
and links to the symbols for those functions at load time.
When you build a shell which is linked to the static version of the
library it becomes a standalone program and all the code in the static
library gets included in the build. It's size will be in the
neighborhood of 2.5Megs.
A framework is a package wrapper around a dynamic library. If you want
to be able to include the framework as a part of your application
package (i.e. the library is relocatable), then the dynamic library,
instead of using a hard-wired path which makes it known to the linker,
uses a relative path. One of these relative paths is indicated by
@executable_path (i.e. relative to the application loading the library).
Some of this is explained in the man page for dyld. Especially how,
under some circumstances, you can use special environment variables to
tell the linker you want to link to a certain version of a library
(perhaps not in a standard location). The target library does have to
cooperate in this process though.
Philip Aker
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