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]

Just a quick top-posted note: lang/gcc5 (as of /usr/ports -r416711) built fine, unlike the lang/gcc6 noted before/below. [I happened to try lang/gcc5 with the bootstrap configuration item disabled.]

I may try lang/gcc6-devel to see what it does.

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

On 2016-Jun-12, at 3:02 PM, Mark Millard <markmi at dsl-only.net> wrote:

> 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