[CMake] find_program search order

[William A. Hoffman]

At 07:20 PM 7/27/2006, Andreas Beckermann wrote:
>Hi
>I have a problem with the search order of FIND_PROGRAM in cmake 2.4.2. The 
>docs say:
>
>[...]
>Projects may override this behavior by simply calling the command twice:
>          FIND_PROGRAM(<VAR> NAMES name PATHS paths NO_DEFAULT_PATH)
>          FIND_PROGRAM(<VAR> NAMES name)
>Once one of these calls succeeds the result variable will be set and stored in 
>the cache so that neither call will search again
>
>I use this as follows:
>
>FIND_PROGRAM(KDE3_DCOPIDL_EXECUTABLE NAME dcopidl
>  PATHS
>  $ENV{KDEDIR}/bin
>  ${KDE3PREFIX}/bin
>  /opt/kde/bin
>  /opt/kde3/bin
>  NO_DEFAULT_PATH
>)
>FIND_PROGRAM(KDE3_DCOPIDL_EXECUTABLE NAME dcopidl)
>
>If I make sure that $KDEDIR is not set, this code will fail on my debian 
>system, although dcopidl is installed in /usr/bin. If I remove 
>NO_DEFAULT_PATH, this code works perfectly.
>The code _also_ works correctly, if I remove the first FIND_PROGRAM() call 
>completely. Once the KDE3_DCOPIDL_EXECUTABLE variable is set to anything, 
>FIND_PROGRAM is apparently a noop.
>
>The following code confirms that:
>SET(KDE3_DCOPIDL_EXECUTABLE "")
>FIND_PROGRAM(KDE3_DCOPIDL_EXECUTABLE NAME dcopidl)
>
>This code won't find dcopidl. If I remove the SET() line however, dcopidl _is_ 
>found.
>
>So to me this looks like a cmake bug. Any idea how to work around this?

The key word is NAMES and not name, that is the problem.  It should be :

Either this:

FIND_PROGRAM(KDE3_DCOPIDL_EXECUTABLE NAMES dcopidl
  PATHS
  $ENV{KDEDIR}/bin
  ${KDE3PREFIX}/bin
  /opt/kde/bin
  /opt/kde3/bin
  NO_DEFAULT_PATH
)
FIND_PROGRAM(KDE3_DCOPIDL_EXECUTABLE NAMES dcopidl)

Or this:

FIND_PROGRAM(KDE3_DCOPIDL_EXECUTABLE dcopidl
  PATHS
  $ENV{KDEDIR}/bin
  ${KDE3PREFIX}/bin
  /opt/kde/bin
  /opt/kde3/bin
  NO_DEFAULT_PATH
)
FIND_PROGRAM(KDE3_DCOPIDL_EXECUTABLE dcopidl)

http://www.cmake.org/HTML/Documentation.html

 FIND_PROGRAM(
             <VAR> 
             name | NAMES name1 [name2 ...]
             PATHS path1 [path2 ... ENV var]
             [PATH_SUFFIXES suffix1 [suffix2 ...]]
             [DOC "cache documentation string"]
             [NO_DEFAULT_PATH]
             [NO_CMAKE_ENVIRONMENT_PATH]
             [NO_CMAKE_PATH]
             [NO_SYSTEM_ENVIRONMENT_PATH]
             [NO_CMAKE_SYSTEM_PATH]
            )

-Bill