MacGui: Add flexible dylib path manipulation so that we can handle external dylibs more easily

At startup, add any extra dylib paths to DYLD_FALLBACK_LIBRARY_PATH.  This is the last path
searched by the system for dylibs and we add our paths to the end of it's list, so this
will never override any system libs or paths the user has explicitly set.

Since applications read the environment once at startup, these changes don't take effect
until we restart with execv.  In order to avoid a possible exec bomb, we add a parameter to
the argv list to prevent any further exec's.

Note that this causes a minor glitch when running under gdb. The execv triggers a trap.  You
just have to 'continue'.


git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@3351 b64f7644-9d1e-0410-96f1-a4d463321fa5

1 files changed, 14 insertions, 3 deletions

diff --git a/doc/BUILD-Mac b/doc/BUILD-Mac
index 55a785eea..5416aae23 100644
--- a/doc/BUILD-Mac
+++ b/doc/BUILD-Mac
@@ -1,4 +1,4 @@
-Build Guide for HandBrake svn2591 on Mac OS X
+Build Guide for HandBrake svn3349 on Mac OS X
 *********************************************
 
 Table of Contents
@@ -504,6 +504,13 @@ to build the default configuration:
 
    * click Build or Build and Go
 
+When using Build and Go, xcode launches the application under the gdb
+debugger.  gdb will encounter a trap when starting the program.  This
+trap is harmless and you should just 'continue'.  For the curious, the
+trap occurs because we add some values to the environment with setenv,
+then do a brain transplant with execv. Restarting the application with
+execv triggers the trap.
+
 The first build (on an empty `build' directory) will take a bit of
 time. You may use the Build Results window to observe progress. The
 most time-consuming part of the build is when the external build system
@@ -646,6 +653,10 @@ When troubleshooting build issues, the following files relative to the
      Environment (variables) dump as seen when Xcode forks `make'.
      Mac OS X only.
 
+A note about gdb: We perform an extra execv when starting the
+application.  This triggers a trap in gdb.  It is harmless.  You should
+just 'continue' from the trap.
+
 Appendix A Project Repository Details
 *************************************
 
@@ -653,7 +664,7 @@ Appendix A Project Repository Details
      root:   svn://svn.handbrake.fr/HandBrake
      branch: trunk
      uuid:   b64f7644-9d1e-0410-96f1-a4d463321fa5
-     rev:    2591
-     date:   2009-06-21 13:15:04 -0400
+     rev:    3349
+     date:   2010-06-02 09:49:18 -0700
      type:   developer