[Bug 207148] powerpc 11.0-CURRENT: error: 'P_KPROC' undeclared (from wrong include path so old proc.h file used)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207148

            Bug ID: 207148
           Summary: powerpc 11.0-CURRENT: error: 'P_KPROC' undeclared
                    (from wrong include path so old proc.h file used)
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: ppc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: markmi at dsl-only.net

This traces back to the build using /usr/include instead of (in my context)
/usr/obj/gcc421/powerpc.powerpc/usr/src/tmp/usr/include (or an equivalent) and
so picking up an old sys/proc.h file. The detailed evidence follows. Note the
lack of any -I or -isysroot or other such in the cc command below.

svnlite update -r295453 /usr/src (for an ^/head context) then a buildworld
buildkernel got:


--- all_subdir_bin ---
--- pkill.o ---
cc  -O2 -pipe   -g -MD -MP -MF.depend.pkill.o -MTpkill.o -std=gnu99
-fstack-protector-strong -Wsystem-headers -Wall -Wno-format-y2k -W
-Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith
-Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wunused-parameter
-Wcast-align -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls
-Wold-style-definition -Wno-pointer-sign    -c /usr/src/bin/pkill/pkill.c -o
pkill.o
. . .
--- all_subdir_bin ---
/usr/src/bin/pkill/pkill.c: In function 'main':
/usr/src/bin/pkill/pkill.c:353: error: 'P_KPROC' undeclared (first use in this
function)
/usr/src/bin/pkill/pkill.c:353: error: (Each undeclared identifier is reported
only once
/usr/src/bin/pkill/pkill.c:353: error: for each function it appears in.)
*** [pkill.o] Error code 1

make[4]: stopped in /usr/src/bin/pkill
1 error

make[4]: stopped in /usr/src/bin/pkill
*** [all_subdir_pkill] Error code 2

What is happening is:

/usr/include/sys/proc.h still has P_KTHREAD
/usr/obj/gcc421/powerpc.powerpc/usr/src/tmp/usr/include/sys/proc.h has P_KPROC

The buildworld processing used /usr/include/sys/proc.h instead of using
/usr/obj/gcc421/powerpc.powerpc/usr/src/tmp/usr/include/sys/proc.h (or an
equivalent).

/usr/src/bin/pkill/Makefile has no CFLAGS+= SOMETHING_FOR_INCLUDE_PATH . So it
depends completely on context for directing where to find the file for:

#include <sys/proc.h>

but that context ends up contributing nothing and so pure default path rules
are used --which picks up the still-old /usr/include/sys/proc.h file.


Stop reading here unless you want more context details.

src.conf content (make.conf empty):

TO_TYPE=powerpc
KERNCONF=GENERICvtsc-NODEBUG
TARGET=powerpc
.if ${.MAKE.LEVEL} == 0
TARGET_ARCH=${TO_TYPE}
.export TARGET_ARCH
.endif
WITH_FAST_DEPEND=
WITH_LIB32=
WITH_BOOT=
COMPILER_TYPE=gcc
WITHOUT_GCC_BOOTSTRAP=
WITH_GCC=
WITH_GCC_IS_CC=
WITH_GNUCXX=
WITHOUT_LIBCPLUSPLUS=
WITHOUT_CLANG_BOOTSTRAP=
WITHOUT_CLANG=
WITHOUT_CLANG_IS_CC=
WITHOUT_CLANG_FULL=
WITHOUT_CLANG_EXTRAS=
NO_WERROR=
MALLOC_PRODUCTION=
WITH_DEBUG_FILES=

# freebsd-version -ku; uname -aKU
11.0-CURRENT
11.0-CURRENT
FreeBSD FBSDG4C0 11.0-CURRENT FreeBSD 11.0-CURRENT #6 r295350M: Sat Feb  6
13:54:57 PST 2016    
root at FBSDG4C0:/usr/obj/gcc421/powerpc.powerpc/usr/src/sys/GENERICvtsc-NODEBUG 
powerpc 1100097 1100097

Command used to buildworld buildkernel:

env __MAKE_CONF=/root/src.configs/make.conf
SRC_ENV_CONF=/root/src.configs/src.conf.powerpc-gcc421.powerpc-host
MAKEOBJDIRPREFIX=/usr/obj/gcc421/powerpc.powerpc make -j 6 buildworld
buildkernel

(This is a classic self-hosted gcc 4.2.1 TARGET_ARCH=powerpc context, not a
clang 3.8.0 based experiment and not a cross build.)

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