Why does MCC in MATLAB Compiler 4.5 (R2006b) open an X display even though it is a command line utility?
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I am trying to compile an application using MATLAB Compiler on a remote machine that has a full MATLAB installation. I start a terminal window session to this machine and try to compile my MATLAB code.
The compilation does not complete, however, because of a broken X connection:
###>%mcc -R "-nodisplay -nojvm" -m pie3d.m
-----------------------------------------------------------------
X connection to localhost:11.0 broken (explicit kill or server shutdown).
###>%mcc -v -R "-nodisplay -nojvm" -m pie3d.m
-----------------------------------------------------------------
X connection to localhost:11.0 broken (explicit kill or server shutdown).
It appears that MCC is trying to open X display, fails, and crashes. I want to know why MCC would need to use X display, which is a command-line utility.
Accepted Answer
MathWorks Support Team
on 22 Jan 2010
The MCC command in MATLAB Compiler uses MATLAB to perform dependency analysis. MATLAB is looking for X display.
In order to work around this issue, you can use either of the following methods
1. Clear the DISPLAY environment variable. In a terminal window, use the commands:
setenv DISPLAY
mcc -m pie3d
This generates a warning that no display is available. However, MATLAB Compiler successfully compiles the file.
2. If the DISPLAY environment variable does not exist, the operating system will use a value from the cache:
-----------------------------------------------------------------
-> DISPLAY=localhost:11.0 used from the cache. No DISPLAY in the
environment . . .
-----------------------------------------------------------------
X connection to localhost:11.0 broken (explicit kill or server shutdown).
In this case, set the DISPLAY environment variable to an invalid value, for example:
setenv DISPLAY fake_display // the syntax for the 'setenv' line depends on what shell you are using
mcc -m pie3d
This will force MATLAB to accept that no display is available, rather than use a value for DISPLAY from the cache.
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on 22 Jan 2010
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