C compiler diagnostics

Other error messages

The following messages may appear at compile time, but they are not generated by the compiler. Messages beginning with Assembler: are produced by as. Messages beginning with ld: are generated by ld, the link editor. Note that the format of the messages varies, and some of the messages are displayed over several lines.

Assembler: file.c
   aline n (cline n) : trouble writing; probably out of temp-file space

The file system may be low on space, or the temporary file or output file exceeded the current ulimit.

Assembler: file.c aline n (cline n)
   Cannot open Output File filename

The directory containing the source file is unwritable, or the file system containing source file is mounted read-only.

ld: Symbol name in file2.o is multiply defined. First defined in file1.o

A symbol name was defined more than once.

undefined first referenced symbol in file

sym1 file1.o

ld fatal: Symbol referencing errors. No output written to a.out

A referenced symbol was not found. Compilation terminates.