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Merge topic 'doc-CMP0054-example'

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9535b86d Help: Replace CMP0054 example to show when it makes a difference
This commit is contained in:
Brad King 2015-04-30 10:31:59 -04:00 committed by CMake Topic Stage
commit e2f72ebdbe
1 changed files with 10 additions and 6 deletions
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16
Help/policy/CMP0054.rst
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@ -16,29 +16,33 @@ Given the following partial example:
:: ::
set(MONKEY 1) set(A E)
set(ANIMAL MONKEY) set(E "")
if("${ANIMAL}" STREQUAL "MONKEY") if("${A}" STREQUAL "")
message("Result is TRUE before CMake 3.1 or when CMP0054 is OLD")
else()
message("Result is FALSE in CMake 3.1 and above if CMP0054 is NEW")
endif()
After explicit expansion of variables this gives: After explicit expansion of variables this gives:
:: ::
if("MONKEY" STREQUAL "MONKEY") if("E" STREQUAL "")
With the policy set to ``OLD`` implicit expansion reduces this semantically to: With the policy set to ``OLD`` implicit expansion reduces this semantically to:
:: ::
if("1" STREQUAL "1") if("" STREQUAL "")
With the policy set to ``NEW`` the quoted arguments will not be With the policy set to ``NEW`` the quoted arguments will not be
further dereferenced: further dereferenced:
:: ::
if("MONKEY" STREQUAL "MONKEY") if("E" STREQUAL "")
This policy was introduced in CMake version 3.1. This policy was introduced in CMake version 3.1.
CMake version |release| warns when the policy is not set and uses CMake version |release| warns when the policy is not set and uses