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Appendix B: Errors Generated by Make 175

‘missing target pattern. Stop.’

‘multiple target patterns. Stop.’

‘target pattern contains no ‘%’. Stop.’

‘mixed implicit and static pattern rules. Stop.’

These are generated for malformed static pattern rules. The ﬁrst means there’s

no pattern in the target section of the rule; the second means there are multiple

patterns in the target section; the third means the target doesn’t contain a

pattern character (%); and the fourth means that all three parts of the static

pattern rule contain pattern characters (%)–only the ﬁrst two parts should. If

you see these errors and you aren’t trying to create a static pattern rule, check

the value of any variables in your target and prerequisite lists to be sure they do

not contain colons. See Section 4.11.1 [Syntax of Static Pattern Rules], page 36.

‘warning: -jN forced in submake: disabling jobserver mode.’

This warning and the next are generated if make detects error conditions re-

lated to parallel processing on systems where sub-makes can communicate (see

Section 5.7.3 [Communicating Options to a Sub-make], page 54). This warning

is generated if a recursive invocation of a make process is forced to have ‘-jN’

in its argument list (where N is greater than one). This could happen, for

example, if you set the MAKE environment variable to ‘make -j2’. In this case,

the sub-make doesn’t communicate with other make processes and will simply

pretend it has two jobs of its own.

‘warning: jobserver unavailable: using -j1. Add ‘+’ to parent make rule.’

In order for make processes to communicate, the parent will pass information to

the child. Since this could result in problems if the child process isn’t actually

a make, the parent will only do this if it thinks the child is a make. The parent

uses the normal algorithms to determine this (see Section 5.7.1 [How the MAKE

Variable Works], page 51). If the makeﬁle is constructed such that the parent

doesn’t know the child is a make process, then the child will receive only part

of the information necessary. In this case, the child will generate this warning

message and proceed with its build in a sequential manner.

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Roland Ver. 4.5 Informações Técnicas Página 185