Author: wyoung
Date: Thu May 27 08:50:11 2010
New Revision: 2662
URL: http://svn.gna.org/viewcvs/mysqlpp?rev=2662&view=rev
Log:
Clarity rewrite of the new 64-bit discussion in the Mac OS X README
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=2662&r1=2661&r2=2662&view=diff
==============================================================================
--- trunk/README-Mac-OS-X.txt (original)
+++ trunk/README-Mac-OS-X.txt Thu May 27 08:50:11 2010
@@ -39,21 +39,28 @@
Dealing with the 64-Bit Transition in Snow Leopard
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- By default, the command-line compiler that comes with Xcode for Snow
- Leopard wants to build 64-bit binaries, even if your system is booted
- into 32-bit mode. This can cause various problems, such as a
- failure in the "configure" step when it's trying to find the MySQL
- C API library, if it was built as a 32-bit library only.
+ Xcode for Snow Leopard installs two independent versions of the GNU
+ Compiler Collection. The default is GCC 4.2, and it is set up to
+ build 64-bit executables by default, even if your system is booted
+ into 32-bit mode. You also get GCC 4.0, which builds 32-bit
+ executables by default. On top of that, you have the confusion
+ added by Apple's decision to make all 64-bit capable machines boot
+ into 32-bit mode by default, except for the Xserves.
- There are many ways to skin this cat. Here are the ones I prefer:
+ The first symptom most people run into as a result of this mess is
+ that the "configure" script fails, yelling something about being
+ unable to link to libmysqlclient, the MySQL C API client library.
+ It's because the library was probably built as a 32-bit executable
+ and you're using the default compiler which tries to build a 64-bit
+ test executable against this library and fails.
- First, you can force the default compiler to build 32-bit binaries:
+ There are many ways out of this tarpit. Here are the ones I prefer:
- ./configure CFLAGS=-m32 CXXFLAGS=-m32 --other-flags-here
+ First, you can force GCC 4.2 to build 32-bit binaries:
- Second, instead of using the GCC 4.2 compilers which default to
- 64-bit, you can configure the build system to use the GCC 4.0
- compilers instead, which default to 32-bit:
+ ./configure CFLAGS=-m32 CXXFLAGS=-m32 LDFLAGS=-m32 --other-flags-here
+
+ Second, you can make the MySQL++ build system use GCC 4.0 instead:
./configure CC=gcc-4.0 CXX=g++-4.0 --other-flags-here
@@ -63,7 +70,8 @@
http://macperformanceguide.com/SnowLeopard-64bit.html
-
+ I'm aware of other solutions to the problem, but I expect one among
+ these will work for you.
Making Universal Binaries
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