On Thu, Sep 4, 2014 at 1:44 PM, Clark Wang <dearv...@gmail.com> wrote:
> On Thu, Sep 4, 2014 at 1:36 PM, Chuck Atkins <chuck.atk...@kitware.com> > wrote: > >> Hi Clark >> >> The expression inside the if statement has it's variables dereferenced >> before evaluating and the non-variables are treated as constant >> expressions. In this case, a resolves to "b", b resolves to "c", and c is >> not a variable so it's treated as the constant expression "c". Thus >> >> >> if(a STREQUAL b OR a STREQUAL c) >> >> gets evaluated as >> >> if( ("b" STREQUAL "c") OR ("b" STREQUAL "c") ) >> > > Thanks a lot. It's clear now. But is there a way to check if the value of > the variable a equals to "b" or "c"? > Found http://stackoverflow.com/questions/19982340/cmake-compare-to-empty-string-with-strequal-failed which suggests to use if(a MATCHES "^b$"). -clark > > -clark > >> >> which is clearly false. Hope that helps. >> >> - Chuck >> >> >
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