[Bug 276079] "options DDB" causes sys/dev/iommu/iommu_gas.c: 1095:1: error: incompatible pointer types passing 'db_cmdfcn_t *' (aka 'void (*)(long, _Bool, long, char *)') to parameter of type 'struct db_command *'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276079

            Bug ID: 276079
           Summary: "options DDB" causes sys/dev/iommu/iommu_gas.c:
                    1095:1: error: incompatible pointer types passing
                    'db_cmdfcn_t *' (aka 'void (*)(long, _Bool, long, char
                    *)') to parameter of type 'struct db_command *'
           Product: Base System
           Version: 13.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: Trond.Endrestol@ximalas.info

Custom kernel for stable/13 amd64 includes GENERIC and adds "options DDB",
causing:

--- iommu_gas.o ---
/usr/src/sys/dev/iommu/iommu_gas.c:1095:1: error: redefinition of
'iommu_domain_show' as different kind of symbol
DB_SHOW_COMMAND(iommu_domain, iommu_domain_show)
^
/usr/src/sys/ddb/ddb.h:176:2: note: expanded from macro 'DB_SHOW_COMMAND'
        DB_SHOW_COMMAND_FLAGS(cmd_name, func_name, 0)
        ^
/usr/src/sys/ddb/ddb.h:174:2: note: expanded from macro 'DB_SHOW_COMMAND_FLAGS'
        _DB_FUNC(_show, cmd_name, func_name, db_show_table, flags, NULL)
        ^
/usr/src/sys/ddb/ddb.h:156:31: note: expanded from macro '_DB_FUNC'
static db_cmdfcn_t _func;                                       \
                                                                ^
note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see
all)
/usr/src/sys/sys/cdefs.h:150:23: note: expanded from macro '__CONCAT'
#define __CONCAT(x,y)   __CONCAT1(x,y)
                        ^
/usr/src/sys/sys/cdefs.h:149:24: note: expanded from macro '__CONCAT1'
#define __CONCAT1(x,y)  x ## y
                        ^
<scratch space>:116:1: note: expanded from here
iommu_domain_show
^
/usr/src/sys/dev/iommu/iommu_gas.c:1095:31: note: previous definition is here
DB_SHOW_COMMAND(iommu_domain, iommu_domain_show)
                              ^
/usr/src/sys/dev/iommu/iommu_gas.c:1095:1: error: incompatible pointer types
passing 'db_cmdfcn_t *' (aka 'void (*)(long, _Bool, long, char *)') to
parameter of type 'struct db_command *' [-Werror,-Wincompatible-pointer-types]
DB_SHOW_COMMAND(iommu_domain, iommu_domain_show)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/sys/ddb/ddb.h:176:2: note: expanded from macro 'DB_SHOW_COMMAND'
        DB_SHOW_COMMAND_FLAGS(cmd_name, func_name, 0)
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/sys/ddb/ddb.h:174:2: note: expanded from macro 'DB_SHOW_COMMAND_FLAGS'
        _DB_FUNC(_show, cmd_name, func_name, db_show_table, flags, NULL)
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/sys/ddb/ddb.h:156:31: note: expanded from macro '_DB_FUNC'
static db_cmdfcn_t _func;                                       \
                                                                ^
/usr/src/sys/ddb/ddb.h:136:34: note: expanded from macro '\
_DB_SET'
    { db_command_register(&list, &__CONCAT(_name,_suffix)); }   \
                                 ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/sys/ddb/ddb.h:234:26: note: passing argument to parameter here
                    struct db_command *);
                                       ^
/usr/src/sys/dev/iommu/iommu_gas.c:1095:1: error: incompatible pointer types
passing 'db_cmdfcn_t *' (aka 'void (*)(long, _Bool, long, char *)') to
parameter of type 'struct db_command *' [-Werror,-Wincompatible-pointer-types]
DB_SHOW_COMMAND(iommu_domain, iommu_domain_show)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/sys/ddb/ddb.h:176:2: note: expanded from macro 'DB_SHOW_COMMAND'
        DB_SHOW_COMMAND_FLAGS(cmd_name, func_name, 0)
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/sys/ddb/ddb.h:174:2: note: expanded from macro 'DB_SHOW_COMMAND_FLAGS'
        _DB_FUNC(_show, cmd_name, func_name, db_show_table, flags, NULL)
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/sys/ddb/ddb.h:156:31: note: expanded from macro '_DB_FUNC'
static db_cmdfcn_t _func;                                       \
                                                                ^
/usr/src/sys/ddb/ddb.h:140:36: note: expanded from macro '\
_DB_SET'
    { db_command_unregister(&list, &__CONCAT(_name,_suffix)); } \
                                   ^~~~~~~~~~~~~~~~~~~~~~~~
/usr/src/sys/ddb/ddb.h:236:26: note: passing argument to parameter here
                    struct db_command *);
                                       ^
3 errors generated.
*** [iommu_gas.o] Error code 1

Disabling "options DDB" effectively hides the problematic code, leading to a
successful build.
Source tree is at commit c85ff48a092e4c5989f91a4a1ccf99441ffb3170, "nfscl: Fix
handling of expired Kerberos credentials (NFSv4.1/4.2)".

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