Relocatable linking with relocations from format elf64-x86-64-freebsd (crt1_s.o) to format elf32-i386-freebsd (gcrt1.o) is not supported

[Alexander Best]

On Sun Aug 21 11, Dimitry Andric wrote:
> On 2011-08-19 10:01, Alexander Best wrote:
> >On Thu Aug 18 11, Dimitry Andric wrote:
> ...
> >>Please use the following fragment instead, which is recommended on
> >><http://wiki.freebsd.org/BuildingFreeBSDWithClang>:
> >thanks. that fixed the issue. seeing forward to simply setting CC/CXX/CPP 
> >to
> >clang or gcc directly and also to using "/", so one can use absolute paths.
> 
> Please try the attached patch, which makes it possible to set CC and CXX
> in make.conf, while allowing the build32 stage to still override them.
> 
> Explanation:
> 1) The build32 stage sets environment variables CC, CXX, AS and LD for
>    its sub-make, to add 32-bit specific flags (-m32 and such).
> 2) The sub-make reads sys.mk, encounters CC?= and CXX?= assignments, so
>    does not alter them.
> 3) After some other stuff, sys.mk reads /etc/make.conf. When you have
>    "CC=xxx" and "CXX=yyy" statements in there, they will *override* the
>    build32-supplied CC/CXX values, nullifying the 32-bit specific flags.
> 4) Thus all objects get built as 64-bit anyway, and since LD is usually
>    not set in make.conf, it still has the 32-bit flags!
> 5) Now, whenever something is linked, you will get a "ld: Relocatable
>    linking with relocations from format elf64-x86-64-freebsd (foo.o) to
>    format elf32-i386-freebsd (bar.o) is not supported" error.
> 
> The patch fixes this by adding "-ECC -ECXX -EAS -ELD" to the build32
> sub-make invocation, which forces those environment variables to always
> override any assignment in makefiles.
> 
> It makes it possible to simply do:
> 
> CC=clang
> CXX=clang++
> 
> in your make.conf, or specify a path, even:
> 
> CC=/usr/local/bin/gcc46
> CXX=/usr/local/bin/g++46
> 
> Note this was already possible on i386, but not yet on amd64.  Also,
> strange things might happen if you set CC but not CXX, or vice versa...

thanks a bunch. both buildworld and buildkernel succeeded with CC, CXX and
CPP set explicitly to the absolute clang location. :)

cheers.
alex


> Index: Makefile.inc1
> ===================================================================
> --- Makefile.inc1	(revision 224934)
> +++ Makefile.inc1	(working copy)
> @@ -313,7 +313,8 @@
>  
>  LIB32WMAKE=	${LIB32WMAKEENV} ${MAKE} -DNO_CPU_CFLAGS -DCOMPAT_32BIT \
>  		-DWITHOUT_BIND -DWITHOUT_MAN -DWITHOUT_INFO \
> -		-DWITHOUT_HTML -DNO_CTF -DNO_LINT DESTDIR=${LIB32TMP}
> +		-DWITHOUT_HTML -DNO_CTF -DNO_LINT -ECC -ECXX -EAS -ELD \
> +		DESTDIR=${LIB32TMP}
>  LIB32IMAKE=	${LIB32WMAKE:NINSTALL=*:NDESTDIR=*} -DNO_INCS
>  .endif
>