Author: wyoung
Date: Tue Aug 19 01:50:30 2008
New Revision: 2353
URL: http://svn.gna.org/viewcvs/mysqlpp?rev=2353&view=rev
Log:
Improved section on universal binaries
Modified:
trunk/README-Mac-OS-X.txt
Modified: trunk/README-Mac-OS-X.txt
URL:
http://svn.gna.org/viewcvs/mysqlpp/trunk/README-Mac-OS-X.txt?rev=2353&r1=2352&r2=2353&view=diff
==============================================================================
--- trunk/README-Mac-OS-X.txt (original)
+++ trunk/README-Mac-OS-X.txt Tue Aug 19 01:50:30 2008
@@ -39,23 +39,37 @@
Making Universal Binaries
~~~~~~~~~~~~~~~~~~~~~~~~~
- The command line build system will generate libraries that
- only work with the platform you build MySQL++ on. If you need
- to generate a libmysqlpp that works on both Intel and PowerPC
- machines, something like this may work:
+ By default, the command line build system will generate libraries
+ that only work with the platform you build MySQL++ on. It can be
+ convinced to build "universal" binaries instead by configuring
+ the library like so:
- $ ./configure CXXFLAGS='-arch ppc -arch i386' --disable-dependency-tracking
+ $ ./configure --disable-dependency-tracking \
+ CXXFLAGS='-arch ppc -arch i386'
- This is untested with MySQL++ in particular, but it's said to work
- with other projects.
+ This builds the library for the two 32-bit OS X architectures, and
+ is what most people have traditionally thought of as "universal".
+ However, you may also want a 64-bit build, meaning there are four
+ different architectures, and thus four -arch flags needed:
- Note that with Tiger -- and to a greater extent, Leopard --
- there are really *four* architectures, not two: you have 32-bit
- and 64-bit versions of both PowerPC and Intel. I'm not sure
- exactly how you'd modify the command above to make a library that
- supports all four, but I'll take a wild guess and say you'll need
- four -arch flags. Or, you can just avoid the command line build
- system, and do it in...
+ $ ./configure --disable-dependency-tracking \
+ CXXFLAGS='-arch ppc -arch ppc64 -arch i386 -arch x86_64'
+
+ These are single commands, with the line broken to keep the line
+ lengths in this document reasonable.
+
+ The first command doubles build time relative to the default
+ configuration, and the second quadruples it. It also makes the
+ resulting binaries larger, which increases the amount of time
+ it takes to start a program. Build MySQL++ like this only if
+ you must.
+
+ The --disable-dependency-tracking flag is necessary because,
+ when building universal binaries, it has to rebuild each source
+ module multiple times, which confuses the logic that tries to tell
+ when a given module needs rebuiding based on its dependencies on
+ other files.
+
Xcode
~~~~~
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