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cmake: work with CMake < 2.8.5

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CMake versions 2.8.4 and earlier were giving this error since r146323:
"string end index: -1 is out of range 0 - 6"

Passing -1 as the length of the desired substring was a new feature
added in CMake 2.8.5:
http://www.cmake.org/Bug/view.php?id=10740

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146372 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dylan Noblesmith 2011-12-12 13:06:25 +00:00
parent ddbc274169
commit f931261b51
1 changed files with 3 additions and 1 deletions
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4
cmake/modules/VersionFromVCS.cmake
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@ -30,7 +30,9 @@ function(add_version_info_from_vcs VERS)
OUTPUT_VARIABLE git_output)
if( git_result EQUAL 0 )
string(REGEX MATCH r[0-9]+ git_svn_rev ${git_output})
string(SUBSTRING "${git_svn_rev}" 1 -1 git_svn_rev_number)
string(LENGTH "${git_svn_rev}" rev_length)
math(EXPR rev_length "${rev_length}-1")
string(SUBSTRING "${git_svn_rev}" 1 ${rev_length} git_svn_rev_number)
set(SVN_REVISION ${git_svn_rev_number} PARENT_SCOPE)
set(git_svn_rev "-svn-${git_svn_rev}")