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ENH: Add SKIP_RULE_DEPENDS option for add_custom_command()

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- Allows make rules to be created with no dependencies.
  - Such rules will not re-run even if the commands themselves change.
  - Useful to create rules that run only if the output is missing.
This commit is contained in:
Brad King
2008-05-14 11:38:47 -04:00
parent 3fb5602e54
commit 600e5e274e
8 changed files with 61 additions and 10 deletions
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Source/cmAddCustomCommandCommand.h
+7 -1
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@@ -71,7 +71,7 @@ public:
" COMMAND command1 [ARGS] [args1...]\n"
" [COMMAND command2 [ARGS] [args2...] ...]\n"
" [MAIN_DEPENDENCY depend]\n"
" [DEPENDS [depends...]]\n"
" [DEPENDS [depends...]] [SKIP_RULE_DEPENDS]\n"
" [IMPLICIT_DEPENDS <lang1> depend1 ...]\n"
" [WORKING_DIRECTORY dir]\n"
" [COMMENT comment] [VERBATIM] [APPEND])\n"
@@ -134,6 +134,12 @@ public:
"created as a file on disk it should be marked as SYMBOLIC with "
"SET_SOURCE_FILES_PROPERTIES.\n"
"The SKIP_RULE_DEPENDS option prevents the custom build rule from "
"having a dependency on itself. This prevents the rule from running "
"again just because the command changed but is useful to create "
"rules that have absolutely no dependencies. Such rules run only "
"when the output file is missing.\n"
"The IMPLICIT_DEPENDS option requests scanning of implicit "
"dependencies of an input file. The language given specifies the "
"programming language whose corresponding dependency scanner should "