On Sun, Oct 05, 2014 at 12:14:59AM +0300, Andrei Banu wrote:
> Hi,
>
> I am attempting LFS version 7.6 but I got stuck on chapter
> 5.5.1 (cross GCC compile).
>
> The host is CentOS 6.5 / 64bit:
> Linux 2.6.32-431.el6.x86_64 #1 SMP
>
> The /configure worked ok. The error came during make.
>
gcc (also binutils, and a few other packages) run 'configure in
various directories after 'make' is invoked. Also, gcc will
eventually run a second build to check itself.
> The error message is this:
>
> ....
> checking how to run the C++ preprocessor... /lib/cpp
> configure: error: in `/mnt/lfs/sources/gcc-build/gcc':
> configure: WARNING: C++ preprocessor "/lib/cpp" fails sanity check
> See `config.log' for more details.
This _looks_ like the error, in that I do not recall seeing it in
my own logs.
> checking for unordered_map... no
> checking for tr1/unordered_map... no
> checking for ext/hash_map... no
> checking dependency style of g++... none
> configure: error: no usable dependency style found
> make[1]: *** [configure-gcc] Error 1
> make[1]: Leaving directory `/mnt/lfs/sources/gcc-build'
> make: *** [all] Error 2
But, that does appear to be the test which caused it to fail.
My initial guess was that you missed the last line from the
configure command on that page : --enable-languages=c,c++ and
you can check that in your command history (e.g. use the
up-arrow from bash's command line). BUT forget htat, I see
that test in my own log, when it is configuring in ./gcc - in
my case it got the correct answer ('gcc3').
So, first run 'find -name config.log | xargs ls -l' :
that should tell you which of them was most recently accessed.
If that is ./config.log, the atime must have been updated when you
looked at it (unusual for a modern system), so look at the next
newest (or oall of them which have the same time.
Search for 'no usable dependency style found' and then look at the
lines just above that : configure sets up a test, logs what it is
going to run, runs it, reports any error, and then eventually
produces the error message. It is the command it ran, and the error
message which resulted directly from that, which matters.
ĸen
>
> I am not sure which parts from config.log I should paste
> in here as it's 1000 lines long but I'll go ahead and paste
> some:
>
> configure:4799: checking for C++ compiler version
> configure:4808: g++ --version >&5
> ../gcc-4.9.1/configure: line 4810: g++: command not found
> configure:4819: $? = 127
> configure:4808: g++ -v >&5
> ../gcc-4.9.1/configure: line 4810: g++: command not found
> configure:4819: $? = 127
> configure:4808: g++ -V >&5
> ../gcc-4.9.1/configure: line 4810: g++: command not found
> configure:4819: $? = 127
> configure:4808: g++ -qversion >&5
> ../gcc-4.9.1/configure: line 4810: g++: command not found
> configure:4819: $? = 127
> configure:4823: checking whether we are using the GNU C++ compiler
> configure:4842: g++ -c conftest.cpp >&5
> ../gcc-4.9.1/configure: line 1751: g++: command not found
>
This says that in _that_ test, g++ was not found : for me, that
is tested for early on in configure (before 'make') and correctly
reports
checking for gcc option to accept ISO C89... none needed
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
Which is a *different* first message (mine checked for 'g++',
and later, still from the initial run of 'configure', I can see:
checking where to find the target c++... just compiled
Does your host system have a working C++ compiler ?
ĸen
--
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Sometimes she went to bed as early as 6 a.m.
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