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-rw-r--r--Source/cmAddCustomCommandCommand.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/Source/cmAddCustomCommandCommand.h b/Source/cmAddCustomCommandCommand.h
index 47b542c..05e7dc2 100644
--- a/Source/cmAddCustomCommandCommand.h
+++ b/Source/cmAddCustomCommandCommand.h
@@ -75,6 +75,10 @@ public:
"A target created in the same directory (CMakeLists.txt file) that "
"specifies any output of the custom command as a source file is given "
"a rule to generate the file using the command at build time. "
+ "Do not list the output in more than one independent target that may "
+ "build in parallel or the two instances of the rule may conflict "
+ "(instead use add_custom_target to drive the command and make the "
+ "other targets depend on that one). "
"If an output name is a relative path it will be interpreted "
"relative to the build tree directory corresponding to the current "
"source directory. "