[Bug preprocessor/78581] New: Out of memory when preprocessing #include with -traditional

[rf at rufflewind dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78581

            Bug ID: 78581
           Summary: Out of memory when preprocessing #include with
                    -traditional
           Product: gcc
           Version: 6.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rf at rufflewind dot com
  Target Milestone: ---

Suppose there are two files within the same directory:

File "a":

    #define g 0
    #include "b"
    #if g
    #endif

File "b":

    #define f(x)
    f

Preprocessing this in -traditional mode leads to a strange error:

    $ gcc -E -traditional -x assembler-with-cpp a >/dev/null

    cc1: out of memory allocating 9223372036854571464 bytes after a total of
434176 bytes

Perhaps the fact that file "b" ends with "f" might be related?

(Note: I ran into this error while compiling Haskell code containing CPP
constructs.)

GCC version: 6.2.1 20160830 (using the prebuilt package from
https://git.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD?h=packages/gcc
)
System: Linux 4.8.10-1-ARCH x86_64 GNU/Linux