Mapserver Install: undefined symbol: php_gd_gdImageCopy

[Daniel Morissette]

Frank Warmerdam wrote:
> 
> Strangely I ran into the very same thing a couple days ago.  It turned
> out (as I recall) that I needed to install the PHP extension for GD.  In
> my case, on a fedora core system, this amounted to something like
> "yum install php-gd" I believe.
> 


Actually, doing this solves the undefined symbol, but you end up with 
two *different* copies of the GD functions in your executable space: the 
core of MapServer where most of the GD usage happens is built and linked 
with the system GD, and the php_mapscript-specific functions (such as 
imageObj.pasteImage() are built and linked with the PHP bundled GD.

At runtime you are likely going to run into problems if you use 
functions such as imageObj.pasteImage() because the gdImage struct used 
by both copies of GD is different.

As I was writing this, I just realized that removing any calls to 
gd-specific functions from php_mapscript.c and moving those calls down 
to wrappers in the mapserver core might be enough to solve the issue, 
but I am hesitant to change this for 4.10.0.

The other workaround for this issue is to rebuild your PHP using the 
system GD (i.e. --with-gd=/path/to/gd-prefix).

FYI, there is already bug 1879 about this:
http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=1879

Daniel
-- 
Daniel Morissette
http://www.mapgears.com/