portfolio/imagemagick: probably missing some linker flags

[caballa]

The command build.sh --disable-inlining fails during link time:

/homes/jorge/src/clang+llvm-10.0.0-x86_64-linux-gnu-ubuntu-18.04/bin/clang++ /homes/jorge/Repos/OCCAM-Benchmarks/examples/portfolio/imagemagick/slash/magick.a.i.p.s.r.i.h.p.s.r.i.h.b\
c /homes/jorge/Repos/OCCAM-Benchmarks/examples/portfolio/imagemagick/slash/._libMagickCore.i.p.s.r.i.h.p.s.r.i.h.bc /homes/jorge/Repos/OCCAM-Benchmarks/examples/portfolio/imagemagick/slash/._li\
bMagickWand.i.p.s.r.i.h.p.s.r.i.h.bc -o magick -O2 -static -nostdlib                                                                                                                              
                                                                                                                                                                                                  
/usr/bin/ld: warning: cannot find entry symbol _start; defaulting to 0000000000400120                                                                                                             
/tmp/magick-6a7239.o: In function `main':                                                                                                                                                         
llvm-link:(.text+0x21): undefined reference to `malloc'                                                                                                                                           
llvm-link:(.text+0x3c7): undefined reference to `stdout'                                                                                                                                          
llvm-link:(.text+0x3cc): undefined reference to `fputs'                                                                                                                                           
/tmp/-ef9632.o: In function `XAnimateImages':                                                                                                                                                     
/homes/jorge/Repos/OCCAM-Benchmarks/examples/portfolio/imagemagick/ImageMagick-7.0.8-68/MagickCore/animate.c:1428: undefined reference to `chdir'                                                 
/tmp/-ef9632.o: In function `RelinquishMagickMemory':                                                                                                                                             
/homes/jorge/Repos/OCCAM-Benchmarks/examples/portfolio/imagemagick/ImageMagick-7.0.8-68/MagickCore/memory.c:1074: undefined reference to `free'                                                   
/tmp/-ef9632.o: In function `XAnimateImages':                                                                                                                                                     
/homes/jorge/Repos/OCCAM-Benchmarks/examples/portfolio/imagemagick/ImageMagick-7.0.8-68/MagickCore/animate.c:1477: undefined reference to `XFreeFont'                                             
/homes/jorge/Repos/OCCAM-Benchmarks/examples/portfolio/imagemagick/ImageMagick-7.0.8-68/MagickCore/animate.c:1495: undefined reference to `XRootWindow'                                           
/homes/jorge/Repos/OCCAM-Benchmarks/examples/portfolio/imagemagick/ImageMagick-7.0.8-68/MagickCore/animate.c:1541: undefined reference to `qsort'                                                 
/tmp/-ef9632.o: In function `LocaleUppercase':                                                                                                                                                    
/homes/jorge/Repos/OCCAM-Benchmarks/examples/portfolio/imagemagick/ImageMagick-7.0.8-68/MagickCore/locale.c:1668: undefined reference to `__toupper_l'   
....

[mudbri]

I was encountering some linking issues while running this example. I fixed this by removing the -nostdlib flag and the native libraries and adding the missing ldflags. The required libraries can be identified by running ./configure.

For example, I got the following result after running configure in the ImageMagick-7.0.8-68 folder:

Options used to compile and link:
  PREFIX          = /usr/local
  EXEC-PREFIX     = /usr/local
  VERSION         = 7.0.8
  CC              = gcc
  CFLAGS          =   -fopenmp -g -O2 -Wall -mtune=core2 -fexceptions -pthread -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16
  CPPFLAGS        =   -DMAGICKCORE_HDRI_ENABLE=1 -DMAGICKCORE_QUANTUM_DEPTH=16
  PCFLAGS         = 
  DEFS            = -DHAVE_CONFIG_H
  LDFLAGS         = 
  LIBS            =                            -lbz2        -lz     -lm     
  CXX             = g++
  CXXFLAGS        = -g -O2 -pthread
  FEATURES        = DPC HDRI Cipher OpenMP
  DELEGATES       = bzlib mpeg zlib
==============================================================================

Thus, I added -lbz2, -lz, -lm and -pthread to the ldflags and it linked successfully.