Arch Linux

python-scipy 0.7.1-1 (NB also python-numpy 1.3.0-2 (x86_64)  FS#16833 )

(1) Cannot build due to a linking error with gfortan libraries (see below).
The problem is LDFLAGS set in /etc/makepkg.conf.
Including 'unset LDFLAGS' in PKGBUILD fixes the error.

This is a new error as I have recompiled scipy numerous times before ( against a custom blas)
and never had a problem. Methinks the latest gcc/binutils package has changed behaviour somehow.
This type of error is known with numpy & scipy e.g. http://projects.scipy.org/numpy/ticket/182

(2) Another potential gotcha bug is the use of a custom FFLAG variable as I had.
This causes the the scipy build scripts to miss setting -fPIC on an x86_64 system resulting the
usual symbol errors. e.g. http://mail.scipy.org/pipermail/scipy-dev/2008-April/008869.html

Adding either unset FFLAGS or FFLAGS="$FFLAGS -fPIC" to the pkgbuild fixes this issue.
Again, I never had any issue with this before.


compilation fails at following
==================================
/usr/bin/gfortran -Wall -Wl,--hash-style=gnu -Wl,--as-needed build/temp.linux-x86_64-2.6/build/src.linux-x86_64-2.6/scipy/fftpack/_fftpackmodule.o build/temp.linux-x86_64-2.6/scipy/fftpack/src/zfft.o build/temp.linux-x86_64-2.6/scipy/fftpack/src/drfft.o build/temp.linux-x86_64-2.6/scipy/fftpack/src/zrfft.o build/temp.linux-x86_64-2.6/scipy/fftpack/src/zfftnd.o build/temp.linux-x86_64-2.6/build/src.linux-x86_64-2.6/fortranobject.o -L/usr/lib -Lbuild/temp.linux-x86_64-2.6 -ldfftpack -lpython2.6 -lgfortran -o build/lib.linux-x86_64-2.6/scipy/fftpack/_fftpack.so
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.4.1/libgfortranbegin.a(fmain.o): In function `main':
(.text+0x26): undefined reference to `MAIN__'
collect2: ld returned 1 exit status
/usr/lib/gcc/x86_64-unknown-linux-gnu/4.4.1/libgfortranbegin.a(fmain.o): In function `main':
(.text+0x26): undefined reference to `MAIN__'
collect2: ld returned 1 exit status
error: Command "/usr/bin/gfortran -Wall -Wl,--hash-style=gnu -Wl,--as-needed build/temp.linux-x86_64-2.6/build/src.linux-x86_64-2.6/scipy/fftpack/_fftpackmodule.o build/temp.linux-x86_64-2.6/scipy/fftpack/src/zfft.o build/temp.linux-x86_64-2.6/scipy/fftpack/src/drfft.o build/temp.linux-x86_64-2.6/scipy/fftpack/src/zrfft.o build/temp.linux-x86_64-2.6/scipy/fftpack/src/zfftnd.o build/temp.linux-x86_64-2.6/build/src.linux-x86_64-2.6/fortranobject.o -L/usr/lib -Lbuild/temp.linux-x86_64-2.6 -ldfftpack -lpython2.6 -lgfortran -o build/lib.linux-x86_64-2.6/scipy/fftpack/_fftpack.so" failed with exit status 1