barrier/res/DefineIfExist.nsh

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!macro !defineifexist _VAR_NAME _FILE_NAME
!tempfile _TEMPFILE
!ifdef NSIS_WIN32_MAKENSIS
; Windows - cmd.exe
!system 'if exist "${_FILE_NAME}" echo !define ${_VAR_NAME} > "${_TEMPFILE}"'
!else
; Posix - sh
!system 'if [ -e "${_FILE_NAME}" ]; then echo "!define ${_VAR_NAME}" > "${_TEMPFILE}"; fi'
!endif
!include '${_TEMPFILE}'
!delfile '${_TEMPFILE}'
!undef _TEMPFILE
!macroend
!define !defineifexist "!insertmacro !defineifexist"
${!defineifexist} gameDeviceSupport "${binDir}\Release\synxinhk.dll"