Hi,

I posted about this on cffi-devel and was redirected here.

I'm running linux (kernel 2.6.26), glibc 2.8, sbcl 1.0.20.30, and iolib/cffi from their respective scm's. The asdf load-op fails when groveling the "grovel.c" file in net.sockets with the following error:

External process exited with code 1. Command was: "gcc" "-m32" "-fPIC" "-o"

"/home/elliott/source/git/iolib/net.sockets/grovel" "/home/elliott/source/git/iolib/net.sockets/grovel.c"

Output was: /home/elliott/source/git/iolib/net.sockets/grovel.c: In function 'main': /home/elliott/source/git/iolib/net.sockets/grovel.c:1705: error:

invalid application of 'sizeof' to incomplete type 'struct ucred'

/home/elliott/source/git/iolib/net.sockets/grovel.c:1711: error:

dereferencing pointer to incomplete type

/home/elliott/source/git/iolib/net.sockets/grovel.c:1716: error:

dereferencing pointer to incomplete type

/home/elliott/source/git/iolib/net.sockets/grovel.c:1721: error:

dereferencing pointer to incomplete type

[Condition of type SIMPLE-ERROR]

Restarts: 0: [TRY-RECOMPILING] Try recompiling grovel 1: [RETRY] Retry performing #<ASDF:COMPILE-OP NIL {B4F0881}> on

#<CFFI-GROVEL:GROVEL-FILE "grovel" {B743CA9}>.

2: [ACCEPT] Continue, treating #<ASDF:COMPILE-OP NIL {B4F0881}> on

#<CFFI-GROVEL:GROVEL-FILE "grovel" {B743CA9}> as having been successful.

3: [ABORT] Return to SLIME's top level. 4: [TERMINATE-THREAD] Terminate this thread (#<THREAD "repl-thread"

RUNNING {ADDC0C9}>)

Backtrace: 0: (CFFI-GROVEL::INVOKE "gcc")[:EXTERNAL] 1: (CFFI-GROVEL:PROCESS-GROVEL-FILE

#P"/home/elliott/source/git/iolib/net.sockets/grovel.lisp" #P"/home..

2: ((SB-PCL::FAST-METHOD ASDF:PERFORM (ASDF:COMPILE-OP

CFFI-GROVEL:GROVEL-FILE)) ..)

3: ((LAMBDA (SB-PCL::.PV. SB-PCL::.NEXT-METHOD-CALL. SB-PCL::.ARG0.

SB-PCL::.ARG1.)) ..)

4: ((SB-PCL::FAST-METHOD ASDF:PERFORM :AROUND (ASDF:COMPILE-OP

CFFI-GROVEL::CC-FLAGS-MIXIN)) ..)

5: ((SB-PCL::FAST-METHOD ASDF:PERFORM :AROUND (ASDF:COMPILE-OP

ASDF:CL-SOURCE-FILE)) ..)

6: ((LAMBDA ())) 7: ((FLET SB-THREAD::WITH-RECURSIVE-LOCK-THUNK)) 8: ((FLET #:WITHOUT-INTERRUPTS-BODY-[CALL-WITH-RECURSIVE-LOCK]508)) 9: (SB-THREAD::CALL-WITH-RECURSIVE-LOCK ..) 10: (SB-C::%WITH-COMPILATION-UNIT #<CLOSURE (LAMBDA #)

{BAE106D}>)[:EXTERNAL]

11: (ASDF:OPERATE ASDF:LOAD-OP IOLIB)[:EXTERNAL]

In doing some searching online I found that glibc now wraps the ucred struct in USE_GNU. This seems to be a glibc 2.8 bug, so in my opinion I don't think valid for iolib to account for. The work around I've put in place is to add ':cc-flags ("-D_GNU_SOURCE")' to the net.sockets.asd's grovel-file and wrapper-file components and all compiles fine for me.

elliott