Re: fft support on octave

This give me the following error.

./configure --prefix=/home/niraj/fftw --enable-shared --enable-float --enable-long-double --enable-sse
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
configure: error: --enable-single/--enable-long-double conflict

After that I tried with the following option and build fftw.

/configure --prefix=/home/niraj/fftw --enable-shared --enable-long-double

But now when I configure octave it says:

configure:68908: $PKG_CONFIG --exists --print-errors "fftw3"
Package fftw3 was not found in the pkg-config search path.
Perhaps you should add the directory containing `fftw3.pc'
to the PKG_CONFIG_PATH environment variable
No package 'fftw3' found

I found inly fftw3l.pc only in lib dir.

[niraj@vlsj-ctrh7dev octave-5.1.0]$ ls -lrt /home/niraj/fftw/lib/pkgconfig/
total 4
-rw-r--r-- 1 niraj cadence1 242 Dec 17 03:46 fftw3l.pc
[niraj@vlsj-ctrh7dev octave-5.1.0]$

Attaching log file here

Thanks

Niraj

On Sun, Dec 15, 2019 at 6:58 AM Kai Torben Ohlhus <address@hidden> wrote:

On 12/14/19 1:24 AM, niraj pandey wrote:
> On Fri, Dec 13, 2019 at 4:45 PM niraj pandey <address@hidden
> <mailto:address@hidden>> wrote:
>
>
>
> On Fri, Dec 13, 2019 at 2:22 PM Kai Torben Ohlhus
> <address@hidden <mailto:address@hidden>> wrote:
>
> On 12/13/19 5:39 PM, niraj pandey wrote:> On Fri, Dec 13, 2019
> at 1:19
> PM Kai Torben Ohlhus <address@hidden <mailto:address@hidden>
> > <mailto:address@hidden <mailto:address@hidden>>> wrote:
> >
> >
> >
> > On 12/13/19 3:48 PM, niraj pandey wrote:
> > > On Fri, Dec 13, 2019 at 12:14 PM Kai Torben Ohlhus
> > <address@hidden <mailto:address@hidden>
> <mailto:address@hidden <mailto:address@hidden>>>
> > >> On 12/13/19 3:14 PM, niraj pandey wrote:
> > >>> Hi ,
> > >>>
> > >>> Could you pls help me how to build octave with fft
> support. I
> > used the
> > >>> following command to build octave but still getting issue.
> > >>>
> > >>>
> > >>> octave:1> fft(0:255)
> > >>> error: fft: support for FFTW was unavailable or
> disabled when
> > liboctave
> > >>> was built
> > >>>
> > >>>
> > >>> ./configure --prefix=/home/niraj/oc CFLAGS=-fPIC
> CXXFLAGS=-fPIC
> > >>> --enable-shared --with-gui --with-qt
> > >>> --with-blas=/v5.1.0/BLAS-3.8.0/blas_LINUX.a
> > >>> --with-lapack=/v5.1.0/lapack-3.8.0/liblapack.a
> --enable-float
> > >>> --enable-sse --with-fftw3-includedir=/tmp/fftw/include/
> > >>> --with-fftw3-libdir=/tmp/fftw/lib
> > >>>
> > >>> Config.log says: configure:69014: WARNING: FFTW3
> library not
> > found.
> > >>> The slower FFTPACK library will be used instead.
> > >>>
> > >>> Thanks
> > >>> Niraj
> > >>
> > >> Dear Niraj,
> > >>
> > >> Still I do not understand why you deploy libraries in
> the "/tmp"
> > >> directory, which is on usual Linux system a volatile
> TeMPorary
> > >> directory. Can't you use your user's /home/niraj
> directory for all
> > >> libraries instead? This might be one root of trouble.
> > >>
> > >> Can you describe, how you installed the FFTW3 library
> on your system?
> > >>
> > >> HTH,
> > >> Kai
> > >>
> > >
> > > Hello Kai,
> > >
> > > I used the following command to install FFTW3.
> > >
> > > ./configure --prefix=/home/niraj/fftw --enable-float
> --enable-sse
> > >
> > > To install the tool on /tmp area first is just check all the
> > > dependencies required by that tool . Once I identify all the
> > > dependencies I install the tool on production area
> through some
> > > automated process :)
> > >
> > > Thanks
> > > Niraj
> >
> > Can you submit a small portion of config.log around the error
> >
> > >>> configure:69014: WARNING: FFTW3 library not found.
> >
> > Usually there is a program which is compiled during
> ./configure and this
> > normally contains the compiler output which might be
> helpful to get to
> > the root of the trouble.
> >
> > Best,
> > Kai
> >
> >
> > Hi Kai,
> >
> > PFA config.log files for fftw and octave .
> >
> > Thanks
> > Niraj
> >
>
>
> Please always answer below the text. The interesting portion is
> this:
>
> $ ./configure --prefix=/home/niraj/oc CFLAGS=-fPIC CXXFLAGS=-fPIC
> --enable-shared --with-gui --with-qt
> --with-blas=common/pkgs/octave/v5.1.0/BLAS-3.8.0/blas_LINUX.a
> --with-lapack=common/pkgs/octave/v5.1.0/lapack-3.8.0/liblapack.a
> --enable-float --enable-sse
> --with-fftw3-includedir=/tmp/fftw/include/
> --with-fftw3-libdir=/tmp/fftw/lib
>
> configure:68911: $? = 1
> configure:68936: checking fftw3.h usability
> configure:68936: gcc -std=gnu11 -c -fPIC -pthread -fopenmp
> -I/tmp/fftw/include/ conftest.c >&5
> configure:68936: $? = 0
> configure:68936: result: yes
> configure:68936: checking fftw3.h presence
> configure:68936: gcc -std=gnu11 -E -I/tmp/fftw/include/ conftest.c
> configure:68936: $? = 0
> configure:68936: result: yes
> configure:68936: checking for fftw3.h
> configure:68936: result: yes
> configure:68947: checking for fftw_plan_dft_1d in -lfftw3
> configure:68978: gcc -std=gnu11 -o conftest -fPIC -pthread -fopenmp
> -I/tmp/fftw/include/ -L/tmp/fftw/lib -L/tmp/fftw/lib
> -Wl,-rpath=/tmp/fftw/lib conftest.c -lfftw3 -lm >&5
> /usr/bin/ld: cannot find -lfftw3
> collect2: error: ld returned 1 exit status
> configure:68978: $? = 1
>
> Is there in `/tmp/fftw/lib` some `libfftw3.so` or is it in
> `/tmp/fftw/lib64`?
>
> HTH,
> Kai
>
>
>
> I do not see any libfftw3.so library there. Instead of that I found
> "libfftw3f.so" under lib.
>
> Thanks
> Niraj
>
>
> Sharing logs zip file here.
>
> Thanks
> Niraj
>

When reading the configure script of fftw

./configure --help
[...]
--enable-shared[=PKGS] build shared libraries [default=no]
[...]
--enable-single compile fftw in single precision
--enable-float synonym for --enable-single
--enable-long-double compile fftw in long-double precision
[...]

you should change your configure flags to:

./configure --prefix=/tmp/fftw --enable-shared \
--enable-float --enable-long-double --enable-sse

HTH,
Kai

From:	niraj pandey
Subject:	Re: fft support on octave
Date:	Tue, 17 Dec 2019 17:40:50 +0530