error installing world from R/O src and obj

[Dimitry Andric]

On 11 Oct 2019, at 11:24, Andriy Gapon <avg at FreeBSD.org> wrote:
> 
> On 11/10/2019 12:05, Andriy Gapon wrote:
>> 
>> Attempting to install r353380 (amd64) with src and obj mounted via NFS.
>> The world has just been built albeit with NO_CLEAN=1.
>> Getting this:
>> ...
>> ===> lib/clang (install)
>> ===> lib/clang/libllvm (install)
>> ===> lib/clang/libclang (install)
>> ===> lib/clang/liblldb (install)
>> ===> lib/clang/headers (install)
>> clang-tblgen -gen-arm-fp16  -I
>> /usr/devel/svn/quick-head/contrib/llvm/tools/clang/include/clang/Basic -d
>> arm_fp16.h.d  -o arm_fp16.h
>> /usr/devel/svn/quick-head/contrib/llvm/tools/clang/include/clang/Basic/arm_fp16.td
>> clang-tblgen: error opening arm_fp16.h.d:Read-only file system
>> *** Error code 1
>> 
>> Stop.
>> 
>> The command is:
>> make installworld __MAKE_CONF=/dev/null SRCCONF=/dev/null DB_FROM_SRC=1 DESTDIR=/mnt
>> 
> 
> It seems that buildworld NO_CLEAN=1 is not regenerating that header for some reason.
> The command was: make buildworld -s -j12 __MAKE_CONF=/dev/null SRCCONF=/dev/null
> NO_CLEAN=1
> 
> If I do make buildenv and then cd lib/clang/headers/ and run make there, I see this:
> $ make
> clang-tblgen -gen-arm-fp16  -I
> /usr/devel/svn/quick-head/contrib/llvm/tools/clang/include/clang/Basic -d
> arm_fp16.h.d  -o arm_fp16.h
> /usr/devel/svn/quick-head/contrib/llvm/tools/clang/include/clang/Basic/arm_fp16.td
> 
> But afterwards:
> $ ls -l /usr/obj/usr/devel/svn/quick-head/amd64.amd64/lib/clang/headers/arm_fp16.h*
> -rw-r--r--  1 avg  wheel  36361 21 Jun 15:12
> /usr/obj/usr/devel/svn/quick-head/amd64.amd64/lib/clang/headers/arm_fp16.h
> -rw-r--r--  1 avg  wheel    100 11 Oct 12:16
> /usr/obj/usr/devel/svn/quick-head/amd64.amd64/lib/clang/headers/arm_fp16.h.d
> 
> The .h.d file has a fresh timestamp, but .h is still old.

The files should be generated when "make depend" is run, but are your
NFS server and client clocks in sync?  Usually this kind of thing is
caused by time differences.

-Dimitry

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