svn commit: r300770 - in head: . contrib/libc++/include contrib/libc++/include/experimental contrib/libc++/include/ext contrib/libc++/src contrib/libc++/src/include contrib/libc++/src/support lib/l...

[Dimitry Andric]

On 27 May 2016, at 18:01, Alan Somers <asomers at freebsd.org> wrote:
> 
> On Fri, May 27, 2016 at 9:42 AM, Dimitry Andric <dim at freebsd.org> wrote:
...
>> My guess is that either ${MAKEOBJDIRPREFIX}/usr/include/c++/v1 needs to
>> be added to the C++ include path, or some other path in the list is
>> missing, at least for C++ compilation.
>> 
>> -Dimitry
> 
> Here it is.  It looks right to me;
> $MAKEOBJDIRPREFIX/home/asomers/freebsd/head/lib32/usr/include/c++/v1
> is in the path, and stddef.h exists in that directory.
> 
> $ c++ -v -m32 -DCOMPAT_32BIT -march=i686 -mmmx -msse -msse2
> -L/scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/lib32
> --sysroot=/scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32
> -B/scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/lib32
> -isystem /scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/include
>  -O2 -pipe -MD -MF.depend.consumer.o -MTconsumer.o
> -fstack-protector-strong -Wsystem-headers -Werror -Wall
> -Wno-format-y2k -W -Wno-unused-parameter -Wpointer-arith
> -Wno-uninitialized -Wno-empty-body -Wno-string-plus-int
> -Wno-unused-const-variable -Wno-tautological-compare -Wno-unused-value
> -Wno-parentheses-equality -Wno-unused-function -Wno-enum-conversion
> -Wno-unused-local-typedef -Qunused-arguments  -Wno-c++11-extensions
> -c /home/asomers/freebsd/head/lib/libdevdctl/consumer.cc -o consumer.o
> FreeBSD clang version 3.8.0 (tags/RELEASE_380/final 262564) (based on
> LLVM 3.8.0)
> Target: i386-unknown-freebsd11.0
> Thread model: posix
> InstalledDir: /scratch/tmp/asomers/obj/home/asomers/freebsd/head/tmp/usr/bin
> "/scratch/tmp/asomers/obj/home/asomers/freebsd/head/tmp/usr/bin/c++"
> -cc1 -triple i386-unknown-freebsd11.0 -emit-obj -disable-free
> -main-file-name consumer.cc -mrelocation-model static -mthread-model
> posix -mdisable-fp-elim -masm-verbose -mconstructor-aliases
> -target-cpu i686 -target-feature +mmx -target-feature +sse
> -target-feature +sse2 -v -dwarf-column-info -debugger-tuning=gdb
> -coverage-file /scratch/tmp/asomers/obj/home/asomers/freebsd/head/world32/home/asomers/freebsd/head/lib/libdevdctl/consumer.o
> -resource-dir /scratch/tmp/asomers/obj/home/asomers/freebsd/head/tmp/usr/bin/../lib/clang/3.8.0
> -dependency-file .depend.consumer.o -sys-header-deps -MT consumer.o
> -isystem /scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/include
> -D COMPAT_32BIT -isysroot
> /scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32
> -internal-isystem
> /scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/include/c++/v1
> -O2 -Wsystem-headers -Werror -Wall -Wno-format-y2k -W
> -Wno-unused-parameter -Wpointer-arith -Wno-uninitialized
> -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable
> -Wno-tautological-compare -Wno-unused-value -Wno-parentheses-equality
> -Wno-unused-function -Wno-enum-conversion -Wno-unused-local-typedef
> -Wno-c++11-extensions -fdeprecated-macro -fdebug-compilation-dir
> /scratch/tmp/asomers/obj/home/asomers/freebsd/head/world32/home/asomers/freebsd/head/lib/libdevdctl
> -ferror-limit 19 -fmessage-length 80 -stack-protector 2
> -fobjc-runtime=gnustep -fcxx-exceptions -fexceptions
> -fdiagnostics-show-option -fcolor-diagnostics -vectorize-loops
> -vectorize-slp -o consumer.o -x c++
> /home/asomers/freebsd/head/lib/libdevdctl/consumer.cc
> clang -cc1 version 3.8.0 based upon LLVM 3.8.0 default target
> x86_64-unknown-freebsd11.0
> ignoring duplicate directory
> "/scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/include"
> #include "..." search starts here:
> #include <...> search starts here:
> /scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/include
> /scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/include/c++/v1
> /scratch/tmp/asomers/obj/home/asomers/freebsd/head/tmp/usr/bin/../lib/clang/3.8.0/include
> End of search list.

The problem appears to be that the .../usr/include/c++/v1 directory
should come *before* the .../usr/include directory, otherwise the
#include_next<> logic will not work as expected.

This is most likely caused by the option:

  -isystem /scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/include

because that forces this path to become before any auto-detected system
include directory.  Note that this option is not needed, since the other
option:

  --sysroot=/scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32

is already taking care of adding the right include directories.  It even
warns about the duplicate directory:

  ignoring duplicate directory
  "/scratch/tmp/asomers/obj/home/asomers/freebsd/head/lib32/usr/include"

So what happens if you delete the -isystem option and its argument?

-Dimitry

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