head -r337868 's stand/defs.mk "CFLAGS.gcc+= -Os" breaks powerpc64's boot1.elf amd64 -> powerpc64 cross build via devel/powerpc64-binutils and devel/powerpc64-gcc

[My previous build was based on head -r337400 and did not have
this problem. I experiment with powerpc64 and powerpc builds
via fairly modern compilers and toolchains, although I currently
do nto have access to such hardware.]

Despite the amd64 and i386 focused comment in:

QUOTE
# Slim down the image. This saves about 15% in size with clang 6 on x86
# Our most constrained /boot/loader env is BIOS booting on x86, where
# our text + data + BTX have to fit into 640k below the ISA hole.
# Experience has shown that problems arise between ~520k to ~530k.
CFLAGS.clang+=  -Oz
CFLAGS.gcc+=    -Os
ENDQUOTE

the code is not conditional on such a context being involved.
This changes the powerpc64 to fail for a devel/powerpc64-gcc and
devel/powerpc64-binutil based build when boot1.elf is attempted:

--- boot1.elf ---
Using built-in specs.
COLLECT_GCC=/usr/local/bin/powerpc64-unknown-freebsd12.0-gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/powerpc64-unknown-freebsd12.0/6.4.0/lto-wrapper
Target: powerpc64-unknown-freebsd12.0
Configured with: /wrkdirs/usr/ports/devel/powerpc64-gcc/work/gcc-6.4.0/configure --target=powerpc64-unknown-freebsd12.0 --disable-nls --enable-languages=c,c++ --enable-gnu-indirect-function --without-headers --with-gmp=/usr/local --with-pkgversion='FreeBSD Ports Collection for powerpc64' --with-system-zlib --with-gxx-include-dir=/usr/include/c++/v1/ --with-sysroot=/ --with-as=/usr/local/bin/powerpc64-unknown-freebsd12.0-as --with-ld=/usr/local/bin/powerpc64-unknown-freebsd12.0-ld --enable-initfini-array --prefix=/usr/local --localstatedir=/var --mandir=/usr/local/man --infodir=/usr/local/info/ --build=x86_64-unknown-freebsd12.0
Thread model: posix
gcc version 6.4.0 (FreeBSD Ports Collection for powerpc64) 
COMPILER_PATH=/usr/local/powerpc64-unknown-freebsd12.0/bin/:/usr/local/libexec/gcc/powerpc64-unknown-freebsd12.0/6.4.0/:/usr/local/libexec/gcc/powerpc64-unknown-freebsd12.0/6.4.0/:/usr/local/libexec/gcc/powerpc64-unknown-freebsd12.0/:/usr/local/lib/gcc/powerpc64-unknown-freebsd12.0/6.4.0/:/usr/local/lib/gcc/powerpc64-unknown-freebsd12.0/:/usr/local/lib/gcc/powerpc64-unknown-freebsd12.0/6.4.0/../../../../powerpc64-unknown-freebsd12.0/bin/
LIBRARY_PATH=/usr/local/powerpc64-unknown-freebsd12.0/bin/:/usr/local/lib/gcc/powerpc64-unknown-freebsd12.0/6.4.0/:/usr/local/lib/gcc/powerpc64-unknown-freebsd12.0/6.4.0/../../../../powerpc64-unknown-freebsd12.0/lib/:/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp/lib/:/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp/usr/lib/
COLLECT_GCC_OPTIONS='-B' '/usr/local/powerpc64-unknown-freebsd12.0/bin/' '-O2' '-pipe' '-nostdinc' '-I' '/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/stand/libsa' '-I' '/usr/src/stand/libsa' '-D' '_STANDALONE' '-I' '/usr/src/sys' '-D' 'double=jagged-little-pill' '-D' 'float=floaty-mcfloatface' '-D' 'LOADER_GELI_SUPPORT' '-I' '/usr/src/stand/libsa/geli' '-D' 'LOADER_DISK_SUPPORT' '-m32' '-mcpu=powerpc' '-ffreestanding' '-msoft-float' '-I' '.' '-I' '/usr/src/stand/common' '-std=gnu99' '-Wsystem-headers' '-Wno-pointer-sign' '-Wno-error=address' '-Wno-error=array-bounds' '-Wno-error=attributes' '-Wno-error=bool-compare' '-Wno-error=cast-align' '-Wno-error=clobbered' '-Wno-error=enum-compare' '-Wno-error=extra' '-Wno-error=inline' '-Wno-error=lo
 gical-not-parentheses' '-Wno-error=strict-aliasing' '-Wno-error=uninitialized' '-Wno-error=unused-but-set-variable' '-Wno-error=unused-function' '-Wno-error=unused-value' '-Wno-error=misleading-inde
 ntation' '-Wno-error=nonnull-compare' '-Wno-error=shift-negative-value' '-Wno-error=tautological-compare' '-Wno-error=unused-const-variable' '-v' '-Os' '-nostdlib' '-static' '-o' 'boot1.elf'
 /usr/local/libexec/gcc/powerpc64-unknown-freebsd12.0/6.4.0/collect2 -plugin /usr/local/libexec/gcc/powerpc64-unknown-freebsd12.0/6.4.0/liblto_plugin.so -plugin-opt=/usr/local/libexec/gcc/powerpc64-unknown-freebsd12.0/6.4.0/lto-wrapper -plugin-opt=-fresolution=/tmp//cco6MSov.res --sysroot=/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp -V -static -melf32ppc_fbsd -V -Bstatic -o boot1.elf -L/usr/local/powerpc64-unknown-freebsd12.0/bin -L/usr/local/lib/gcc/powerpc64-unknown-freebsd12.0/6.4.0 -L/usr/local/lib/gcc/powerpc64-unknown-freebsd12.0/6.4.0/../../../../powerpc64-unknown-freebsd12.0/lib -L/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp/lib -L/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_tool
 chain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp/usr/lib -N boot1.o qdivrem.o udivdi3.o ashldi3.o syncicache.o
GNU ld (GNU Binutils) 2.30
  Supported emulations:
   elf64ppc_fbsd
   elf64ppc
   elf32ppc_fbsd
   elf32ppc
GNU ld (GNU Binutils) 2.30
  Supported emulations:
   elf64ppc_fbsd
   elf64ppc
   elf32ppc_fbsd
   elf32ppcboot1.o: In function `__puts':
boot1.c:(.text+0xe0): undefined reference to `_restgpr_28_x'
boot1.o: In function `__printf':
boot1.c:(.text+0x1a0): undefined reference to `_restgpr_24_x'
boot1.o: In function `ofw_getprop':
boot1.c:(.text+0x5fc): undefined reference to `_restgpr_31_x'
boot1.o: In function `ofw_close':
boot1.c:(.text+0x668): undefined reference to `_restgpr_31_x'
boot1.o: In function `dskread':
boot1.c:(.text+0x76c): undefined reference to `_restgpr_25_x'
boot1.o: In function `ofw_write.constprop.2':
boot1.c:(.text+0x7f4): undefined reference to `_restgpr_30_x'
boot1.o: In function `putchar':
boot1.c:(.text+0x844): undefined reference to `_restgpr_30_x'
boot1.o: In function `fsread_size.constprop.11':
boot1.c:(.text+0x904): undefined reference to `_restgpr_17_x'
boot1.o: In function `domount.constprop.4':
boot1.c:(.text+0xe98): undefined reference to `_restgpr_30_x'
boot1.o: In function `main':
boot1.c:(.text.startup+0x3c0): undefined reference to `_restgpr_19_x'
qdivrem.o: In function `__qdivrem':
qdivrem.c:(.text+0xb8): undefined reference to `_restgpr_25_x'
collect2: error: ld returned 1 exit status
*** [boot1.elf] Error code 1

make[5]: stopped in /usr/src/stand/powerpc/boot1.chrp
.ERROR_TARGET='boot1.elf'
.ERROR_META_FILE='/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/stand/powerpc/boot1.chrp/boot1.elf.meta'
.MAKE.LEVEL='5'
MAKEFILE=''
.MAKE.MODE='meta missing-filemon=yes missing-meta=yes silent=yes verbose'
_ERROR_CMD='/usr/local/bin/powerpc64-unknown-freebsd12.0-gcc --sysroot=/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp -B/usr/local/powerpc64-unknown-freebsd12.0/bin/ -O2 -pipe -nostdinc -I/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/stand/libsa -I/usr/src/stand/libsa -D_STANDALONE -I/usr/src/sys -Ddouble=jagged-little-pill -Dfloat=floaty-mcfloatface -DLOADER_GELI_SUPPORT -I/usr/src/stand/libsa/geli -DLOADER_DISK_SUPPORT -m32 -mcpu=powerpc -ffreestanding -msoft-float -I. -I/usr/src/stand/common -std=gnu99 -Wsystem-headers -Wno-pointer-sign -Wno-error=address -Wno-error=array-bounds -Wno-error=attributes -Wno-error=bool-compare -Wno-error=cast-align -Wno-error=clobbered -Wno-error=enum-compa
 re -Wno-error=extra -Wno-error=inline -Wno-error=logical-not-parentheses -Wno-error=strict-aliasing -Wno-error=uninitialized -Wno-error=unused-but-set-variable -Wno-error=unused-function -Wno-error=
 unused-value -Wno-error=misleading-indentation -Wno-error=nonnull-compare -Wno-error=shift-negative-value -Wno-error=tautological-compare -Wno-error=unused-const-variable -v -Os -nostdlib -static -Wl,-N  -o boot1.elf boot1.o qdivrem.o udivdi3.o ashldi3.o syncicache.o  ;'
.CURDIR='/usr/src/stand/powerpc/boot1.chrp'
.MAKE='make'
.OBJDIR='/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/stand/powerpc/boot1.chrp'
.TARGETS='all'
DESTDIR='/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp'
LD_LIBRARY_PATH=''
MACHINE='powerpc'
MACHINE_ARCH='powerpc64'
MAKEOBJDIRPREFIX=''
MAKESYSPATH='/usr/src/share/mk'
MAKE_VERSION='20180512'
PATH='/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp/legacy/usr/sbin:/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp/legacy/usr/bin:/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp/legacy/bin:/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp/usr/sbin:/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64/tmp/usr/bin:/sbin:/bin:/usr/sbin:/usr/bin'
SRCTOP='/usr/src'
OBJTOP='/usr/obj/powerpc64vtsc_xtoolchain-gcc-no_toolchain/powerpc.powerpc64/usr/src/powerpc.powerpc64'
.MAKE.MAKEFILES='/usr/src/share/mk/sys.mk /usr/src/share/mk/local.sys.env.mk /usr/src/share/mk/src.sys.env.mk /root/src.configs/src.conf.powerpc64-xtoolchain-gcc-no_toolchain.amd64-host /usr/src/share/mk/bsd.mkopt.mk /usr/src/share/mk/src.sys.obj.mk /usr/src/share/mk/auto.obj.mk /usr/src/share/mk/bsd.suffixes.mk /root/src.configs/make.conf /usr/src/share/mk/local.sys.mk /usr/src/share/mk/src.sys.mk /dev/null /usr/src/stand/powerpc/boot1.chrp/Makefile /usr/src/share/mk/bsd.init.mk /usr/src/share/mk/bsd.opts.mk /usr/src/share/mk/bsd.cpu.mk /usr/src/share/mk/local.init.mk /usr/src/share/mk/src.init.mk /usr/src/stand/powerpc/boot1.chrp/../Makefile.inc /usr/src/stand/powerpc/boot1.chrp/../../Makefile.inc /usr/src/stand/powerpc/boot1.chrp/../../defs.mk /usr/src/share/mk/src.opts.mk /usr/src/shar
 e/mk/bsd.own.mk /usr/src/share/mk/bsd.compiler.mk /usr/src/share/mk/bsd.linker.mk /usr/src/stand/powerpc/boot1.chrp/Makefile.hfs /usr/src/share/mk/bsd.prog.mk /usr/src/share/mk/bsd.libnames.mk /usr/
 src/share/mk/src.libnames.mk /usr/src/share/mk/bsd.nls.mk /usr/src/share/mk/bsd.confs.mk /usr/src/share/mk/bsd.files.mk /usr/src/share/mk/bsd.dirs.mk /usr/src/share/mk/bsd.incs.mk /usr/src/share/mk/bsd.links.mk /usr/src/share/mk/bsd.man.mk /usr/src/share/mk/bsd.dep.mk /usr/src/share/mk/bsd.clang-analyze.mk /usr/src/share/mk/bsd.obj.mk /usr/src/share/mk/bsd.subdir.mk /usr/src/share/mk/bsd.sys.mk'
.PATH='. /usr/src/stand/powerpc/boot1.chrp /usr/src/sys/libkern /usr/src/lib/libc/powerpc/gen /usr/src/stand/powerpc/boot1.chrp'
1 error


The following patch was sufficient to show that the
-Os use made the difference (but I do not know about
other TARGET_ARCH= alternatives so it may not be
appropriate overall).

# svnlite diff /usr/src/stand/defs.mk
Index: /usr/src/stand/defs.mk
===================================================================
--- /usr/src/stand/defs.mk	(revision 338319)
+++ /usr/src/stand/defs.mk	(working copy)
@@ -53,6 +53,7 @@
 CFLAGS+=	-I${SYSDIR}
 # Spike the floating point interfaces
 CFLAGS+=	-Ddouble=jagged-little-pill -Dfloat=floaty-mcfloatface
+.if ${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386"
 # Slim down the image. This saves about 15% in size with clang 6 on x86
 # Our most constrained /boot/loader env is BIOS booting on x86, where
 # our text + data + BTX have to fit into 640k below the ISA hole.
@@ -59,6 +60,7 @@
 # Experience has shown that problems arise between ~520k to ~530k.
 CFLAGS.clang+=	-Oz
 CFLAGS.gcc+=	-Os
+.endif
 
 # GELI Support, with backward compat hooks (mostly)
 .if defined(LOADER_NO_GELI_SUPPORT)
@@ -87,6 +89,7 @@
 # or powerpc64.
 .if ${MACHINE_ARCH} == "powerpc64"
 CFLAGS+=	-m32 -mcpu=powerpc
+LFLAGS+=	-Wl,-m -Wl,elf32ppc_fbsd
 .endif
 
 # For amd64, there's a bit of mixed bag. Some of the tree (i386, lib*32) is


Note: The "LFLAGS+=	-Wl,-m -Wl,elf32ppc_fbsd" is a long-standing item
in my powerpc64 experimental environment and is not the point here.


For reference:

# more ~/src.configs/src.conf.powerpc64-xtoolchain-gcc-no_toolchain.amd64-host
TO_TYPE=powerpc64
TOOLS_TO_TYPE=${TO_TYPE}
VERSION_CONTEXT=12.0
#
KERNCONF=GENERIC64vtsc-NODBG
TARGET=powerpc
.if ${.MAKE.LEVEL} == 0
TARGET_ARCH=${TO_TYPE}
.export TARGET_ARCH
.endif
#
WITHOUT_CROSS_COMPILER=
WITHOUT_SYSTEM_COMPILER=
WITHOUT_SYSTEM_LINKER=
#
WITH_LIBCPLUSPLUS=
WITHOUT_LLD_BOOTSTRAP=
WITHOUT_BINUTILS_BOOTSTRAP=
WITHOUT_ELFTOOLCHAIN_BOOTSTRAP=
WITHOUT_CLANG_BOOTSTRAP=
WITHOUT_CLANG_IS_CC=
WITHOUT_CLANG=
WITHOUT_CLANG_FULL=
WITHOUT_CLANG_EXTRAS=
WITHOUT_LLD=
WITHOUT_BINUTILS=
WITHOUT_LLDB=
#
WITH_BOOT=
# powerpc64 LIB32 builds via gcc 4.9 or later variants that I've tried
# but the LIB32 does not work [crtbeginS code problem(s): bad R30 use]
#WITHOUT_LIB32=
WITH_LIB32=
#
WITHOUT_GCC_BOOTSTRAP=
WITHOUT_GCC=
WITHOUT_GCC_IS_CC=
WITHOUT_GNUCXX=
#
NO_WERROR=
#
# Avoid db_trace.o getting:
#   calling '__builtin_frame_address' with a nonzero argument is unsafe
# as an error? Other such points as well.
#WERROR=
MALLOC_PRODUCTION=
#
WITH_REPRODUCIBLE_BUILD=
WITH_DEBUG_FILES=
#
#
# For TO (so-called "cross") stages . . .
# So-called-cross via ${TO_TYPE}-xtoolchain-gcc/${TO_TYPE}-gcc. . .
# TOOLS_TO_TYPE based on ${TO_TYPE}-xtoolchain-gcc related binutils. . .
#
CROSS_TOOLCHAIN=${TO_TYPE}-gcc
X_COMPILER_TYPE=gcc
CROSS_BINUTILS_PREFIX=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/
.if ${.MAKE.LEVEL} == 0
XCC=/usr/local/bin/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}-gcc
XCXX=/usr/local/bin/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}-g++
XCPP=/usr/local/bin/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}-cpp
.export XCC
.export XCXX
.export XCPP
XAS=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/as
XAR=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/ar
XLD=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/ld
XNM=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/nm
XOBJCOPY=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/objcopy
XOBJDUMP=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/objdump
XRANLIB=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/ranlib
XSIZE=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/size
#NO-SUCH: XSTRINGS=/usr/local/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}/bin/strings
XSTRINGS=/usr/local/bin/${TOOLS_TO_TYPE}-unknown-freebsd${VERSION_CONTEXT}-strings
.export XAS
.export XAR
.export XLD
.export XNM
.export XOBJCOPY
.export XOBJDUMP
.export XRANLIB
.export XSIZE
.export XSTRINGS
.endif
#
#
# From based on clang (via system). . .
#
.if ${.MAKE.LEVEL} == 0
CC=/usr/bin/clang
CXX=/usr/bin/clang++
CPP=/usr/bin/clang-cpp
.export CC
.export CXX
.export CPP
.endif


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)