[LLVMbugs] [Bug 18075] New: Clang errors out on OpenBSD's bounded attribute

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18075

            Bug ID: 18075
           Summary: Clang errors out on OpenBSD's bounded attribute
           Product: clang
           Version: trunk
          Hardware: All
                OS: OpenBSD
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: brad at comstyle.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

As mentioned in OpenBSD's gcc-local(1)..

     -   gcc recognizes a new flag, -Wbounded, to perform basic checks on
         functions which accept buffers and sizes.  An extra attribute,
         __bounded__, has been added to mark functions that can be checked
         this way.

Clang does not support the bounded attribute yet; eventually someone will
probably submit support for it, but with trunk and what will be 3.4 Clang no
longer ignores the attribute unlike 3.3 and now errors out. This leaves
Clang/LLVM in an unusable state on OpenBSD as is.

clang -fno-color-diagnostics -O2 -pipe  -fno-pie   -DINET6 -c cmds.c
In file included from cmds.c:67:
In file included from /usr/include/sys/types.h:224:
In file included from /usr/include/sys/select.h:37:
In file included from /usr/include/sys/time.h:329:
/usr/include/time.h:135:31: error: use of undeclared identifier '__string__'
                __attribute__ ((__bounded__(__string__,1,2)));
                                            ^
/usr/include/time.h:145:31: error: use of undeclared identifier '__minbytes__'
                __attribute__ ((__bounded__(__minbytes__,2,26)));
                                            ^
/usr/include/time.h:147:31: error: use of undeclared identifier '__minbytes__'
                __attribute__ ((__bounded__(__minbytes__,2,26)));

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