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macro(assert_var_defined varname)
if(NOT DEFINED ${varname})
message(SEND_ERROR "${varname} is not defined.")
endif()
endmacro()
macro(assert_vars_strequal varname exp_varname)
assert_var_defined(${varname})
if(NOT ${varname} STREQUAL ${exp_varname})
message(SEND_ERROR "${varname} is '${${varname}}', expecting '${${exp_varname}}'.")
endif()
endmacro()
macro(assert_var_str_value varname value)
assert_var_defined(${varname})
set(_value_var "${value}")
if(NOT ${varname} STREQUAL _value_var)
message(SEND_ERROR "${varname} is '${${varname}}', expecting '${value}'.")
endif()
endmacro()
macro(assert_var_relative_path varname)
if(NOT DEFINED ${varname})
message(SEND_ERROR "${varname} is not defined.")
elseif(IS_ABSOLUTE "${${varname}}")
message(SEND_ERROR "${varname} (${${varname}}) should be a relative path, but is absolute.")
endif()
endmacro()
macro(assert_var_absolute_path varname)
if(NOT DEFINED ${varname})
message(SEND_ERROR "${varname} is not defined.")
elseif(NOT IS_ABSOLUTE "${${varname}}")
message(SEND_ERROR "${varname} (${${varname}}) should be an absolute path, but is relative.")
endif()
endmacro()
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