Error(271004): Can't process assignment. Attribute format is illegal -- parsing error <text> (line <number>). Use legal format for ALTERA_ATTRIBUTE assignment.

Description

Due to a problem in the Intel® Quartus® Prime Pro Edition software in Linux* OS, this error may occur when trying to compile a design that was generated in Windows* OS and contains multiline syntax in the ALTERA_ATTRIBUTE. 

Example: (* altera_attribute = "-name VIRTUAL_PIN ON -to a[*]; \

                                                        -name VIRTUAL_PIN ON -to b[*]; \

                                                        -name VIRTUAL_PIN ON -to clock" *)

The use of multiline syntax for ALTERA_ATTRIBUTE in the Intel® Quartus® Prime Pro Edition software in Windows* OS contains Windows* DOS* line endings that may cause this error.

Resolution

To work around this problem in the Intel® Quartus® Prime Pro Edition software in Linux* OS, convert the design file to use UNIX* line ending format.