Red Hat ENTERPRISE LINUX 3 - USING CPP Using Instructions page 46

42 Chapter 6. Line Control
distribution was created. If GCC tries to search for headers in those directories, the build is likely to
fail.
The new behavior can cause failures too, if the generated file is not in the same directory as its source
and it attempts to include a header which would be visible searching from the directory containing the
source file. However, this problem is easily solved with an additional switch on the command line.
-I
The failures caused by the old semantics could sometimes be corrected only by editing the generated
files, which is difficult and error-prone.