lang/gcc6 (as of /usr/ports -r416711) does not build on 11.0 -r301815 on an rpi2 [armv7-a, cortex-a7]: a.out uses VFP register arguments, . . . does not

[Mark Millard]

On an rpi2:

> # uname -apKU
> FreeBSD rpi2 11.0-ALPHA3 FreeBSD 11.0-ALPHA3 #0 r301815M: Sat Jun 11 23:43:48 PDT 2016     markmi at FreeBSDx64:/usr/obj/clang/arm.armv6/usr/src/sys/RPI2-NODBG  ar
> m armv6 1100116 1100116


with /usr/ports at -r416711. . .


For attempting to build lang/gcc6 with the bootstrap configuration item enabled:

> configure:3735: /usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/xgcc -B/usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/ -B/usr/local/armv6-por
> tbld-freebsd11.0/bin/ -B/usr/local/armv6-portbld-freebsd11.0/lib/ -isystem /usr/local/armv6-portbld-freebsd11.0/include -isystem /usr/local/armv6-portbld-freebs
> d11.0/sys-include    -O2 -pipe -mcpu=cortex-a7  -DLIBICONV_PLUG -g -fno-strict-aliasing   conftest.c  >&5
> /usr/local/bin/ld: error: a.out uses VFP register arguments, /usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/crtbegin.o does not
> /usr/local/bin/ld: failed to merge target specific data of file /usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/crtbegin.o
> /usr/local/bin/ld: error: a.out uses VFP register arguments, /tmp/ccC38Tl3.o does not
> /usr/local/bin/ld: failed to merge target specific data of file /tmp/ccC38Tl3.o
> /usr/local/bin/ld: error: a.out uses VFP register arguments, /usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/crtend.o does not
> /usr/local/bin/ld: failed to merge target specific data of file /usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/crtend.o
> collect2: error: ld returned 1 exit status
> configure:3739: $? = 1
> configure:3776: result: 
> configure: failed program was:
> | /* confdefs.h */
> | #define PACKAGE_NAME "GNU Offloading and Multi Processing Runtime Library"
> | #define PACKAGE_TARNAME "libgomp"
> | #define PACKAGE_VERSION "1.0"
> | #define PACKAGE_STRING "GNU Offloading and Multi Processing Runtime Library 1.0"
> | #define PACKAGE_BUGREPORT ""
> | #define PACKAGE_URL "http://www.gnu.org/software/libgomp/"
> | #define PACKAGE "libgomp"
> | #define VERSION "1.0"
> | /* end confdefs.h.  */
> | 
> | int
> | main ()
> | {
> | 
> |   ;
> |   return 0;
> | }
> configure:3782: error: in `/usr/obj/portswork/usr/ports/lang/gcc6/work/.build/armv6-portbld-freebsd11.0/libgomp':
> configure:3786: error: C compiler cannot create executables



For attempting to build lang/gcc6 with the bootstrap configuraiton item disabled similar ld reports are generated:

> /usr/local/bin/ld: error: a.out uses VFP register arguments, /usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/crtbegin.o does not
> /usr/local/bin/ld: failed to merge target specific data of file /usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/crtbegin.o
> /usr/local/bin/ld: error: a.out uses VFP register arguments, /tmp/cco9nucg.o does not
> /usr/local/bin/ld: failed to merge target specific data of file /tmp/cco9nucg.o
> /usr/local/bin/ld: error: a.out uses VFP register arguments, /usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/crtend.o does not
> /usr/local/bin/ld: failed to merge target specific data of file /usr/obj/portswork/usr/ports/lang/gcc6/work/.build/./gcc/crtend.o
> collect2: error: ld returned 1 exit status
> configure:3003: $? = 1
> configure:3040: result: 
> configure: failed program was:
> | /* confdefs.h */
> | #define PACKAGE_NAME "package-unused"
> | #define PACKAGE_TARNAME "libbacktrace"
> | #define PACKAGE_VERSION "version-unused"
> | #define PACKAGE_STRING "package-unused version-unused"
> | #define PACKAGE_BUGREPORT ""
> | #define PACKAGE_URL ""
> | /* end confdefs.h.  */
> | 
> | int
> | main ()
> | {
> | 
> |   ;
> |   return 0;
> | }
> configure:3046: error: in `/usr/obj/portswork/usr/ports/lang/gcc6/work/.build/armv6-portbld-freebsd11.0/libbacktrace':
> configure:3050: error: C compiler cannot create executables


Context details. . .

As for the in-use make.conf (not the one used for the system build):

> # more /etc/make.conf
> DEFAULT_VERSIONS+=perl5=5.22
> WRKDIRPREFIX=/usr/obj/portswork
> WITH_DEBUG=
> WITH_DEBUG_FILES=
> MALLOC_PRODUCTION=
> #
> #system clang 3.8 (gcc6 rejects -march=armv7a):
> #CFLAGS+= -march=armv7-a -mcpu=cortex-a7
> #CXXFLAGS+= -march=armv7-a -mcpu=cortex-a7
> #CPPFLAGS+= -march=armv7-a -mcpu=cortex-a7
> #
> #lang/gcc6's xgcc stage considers the above conflicting so use just:
> CFLAGS+= -mcpu=cortex-a7
> CXXFLAGS+= -mcpu=cortex-a7
> CPPFLAGS+= -mcpu=cortex-a7


The armv6 11.0 -r301815 system was cross built from amd64, built using src.conf:

> # more ~/src.configs/src.conf.rpi2-clang-bootstrap.amd64-host 
> TO_TYPE=armv6
> #
> KERNCONF=RPI2-NODBG
> TARGET=arm
> .if ${.MAKE.LEVEL} == 0
> TARGET_ARCH=${TO_TYPE}
> .export TARGET_ARCH
> .endif
> #
> WITH_CROSS_COMPILER=
> WITHOUT_SYSTEM_COMPILER=
> #
> #CPUTYPE=soft
> WITH_LIBSOFT=
> WITH_LIBCPLUSPLUS=
> WITH_BINUTILS_BOOTSTRAP=
> WITH_CLANG_BOOTSTRAP=
> WITH_CLANG=
> WITH_CLANG_IS_CC=
> WITH_CLANG_FULL=
> WITH_CLANG_EXTRAS=
> WITH_LLDB=
> #
> WITH_BOOT=
> WITHOUT_LIB32=
> #
> WITHOUT_ELFTOOLCHAIN_BOOTSTRAP=
> WITHOUT_GCC_BOOTSTRAP=
> WITHOUT_GCC=
> WITHOUT_GCC_IS_CC=
> WITHOUT_GNUCXX=
> #
> NO_WERROR=
> #WERROR=
> MALLOC_PRODUCTION=
> #
> WITH_DEBUG_FILES=
> #
> XCFLAGS+= -march=armv7-a -mcpu=cortex-a7
> XCXXFLAGS+= -march=armv7-a -mcpu=cortex-a7
> # There is no XCPPFLAGS but XCPP ets XCFLAGS content.

and with the make.conf for the system build being empty:

> # more ~/src.configs/make.conf 
> #


===
Mark Millard
markmi at dsl-only.net