On 19 Oct 2014, at 18:34, Matthew Grooms <mgro...@shrew.net> wrote:
> As most of you are probably aware, Roger at Citrix R&D has been doing some 
> incredible work to bring PVH domU/dom0 support to FreeBSD. There has also 
> been an effort by other Xen developers to get the software to compile using 
> clang. While most of these attempts appear to be on Linux platforms targeting 
> arm processors, the FreeBSD version of binutils is quite a bit older. Clang 
> still can't parse all of the assembly that Xen requires, so unfortunately the 
> -no-integrated-as option has to be used in several cases.

What kind of assembly is that?  And are you using clang 3.4.1 from base?


> Which brings me to my question, is there a way to ask clang to use the ports 
> version of binutils when -no-integrated-as is passed to clang? The version of 
> 'as' in base fails to compile such as ...
> 
> /tmp/misc-bf1339.s: Assembler messages:
> /tmp/misc-bf1339.s:375: Error: unknown pseudo-op: `.cfi_sections'

Yes, binutils in base is forever stuck at version 2.17.50, which is
ancient by by now.


> If /usr/local/bin/as is symlinked to /usr/bin/as, the compile completes but I 
> assume there is a better way to tell clang where the external as binary is 
> when -no-integrated-as is invoked. I've googled a bunch but came up empty 
> handed so far. I thought it would be worth asking here in case someone has 
> already run across this problem and had more insight.

Yes, just pass -B/usr/local/bin on the command line.  Note that this
will make it search for *all* external tools in /usr/local/bin, e.g.
ld will also be run from there.  For example:

$ clang -v -no-integrated-as -B/usr/local/bin hello-world.c -o hello-world
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
Target: i386-unknown-freebsd11.0
Thread model: posix
Selected GCC installation:
 "/usr/bin/clang" -cc1 -triple i386-unknown-freebsd11.0 -S -disable-free 
-main-file-name hello-world.c -mrelocation-model static -mdisable-fp-elim 
-masm-verbose -mconstructor-aliases -target-cpu i486 -v -resource-dir 
/usr/bin/../lib/clang/3.4.1 -fno-dwarf-directory-asm -fdebug-compilation-dir 
/share/dim/src/misc -ferror-limit 19 -fmessage-length 297 -mstackrealign 
-fobjc-runtime=gnustep -fdiagnostics-show-option -fcolor-diagnostics 
-vectorize-slp -o /home/dim/tmp/hello-world-410124.s -x c hello-world.c
clang -cc1 version 3.4.1 based upon LLVM 3.4.1 default target 
i386-unknown-freebsd11.0
ignoring nonexistent directory "/usr/bin/../lib/clang/3.4.1/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/include/clang/3.4.1
 /usr/include
End of search list.
 "/usr/local/bin/as" --32 -o /home/dim/tmp/hello-world-288694.o 
/home/dim/tmp/hello-world-410124.s
 "/usr/local/bin/ld" --eh-frame-hdr -dynamic-linker /libexec/ld-elf.so.1 
--hash-style=both --enable-new-dtags -m elf_i386_fbsd -o hello-world 
/usr/lib/crt1.o /usr/lib/crti.o /usr/lib/crtbegin.o -L/usr/lib 
/home/dim/tmp/hello-world-288694.o -lgcc --as-needed -lgcc_s --no-as-needed -lc 
-lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/crtend.o /usr/lib/crtn.o

-Dimitry

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