[GiNaC-list] libreadline and dlopen() issues

[Luke]

I'm trying to build ginac from source (master branch, commit
a104ecb34a015fc40a4bdc16ae6ea038ecb8c55d).  The configure step is
unable to find libreadline for some reason and I can't figure out why.

Here is what I've got:

luke at ThinkPad-W510:~/repos/ginac(master)$ ll /usr/lib/libreadline*.*
-rw-r--r-- 1 root root 505980 2011-09-01 10:43 /usr/lib/libreadline.a
lrwxrwxrwx 1 root root     21 2011-09-01 10:43 /usr/lib/libreadline.so
-> /lib/libreadline.so.6
luke at ThinkPad-W510:~/repos/ginac(master)$ ls /usr/include/readline/
chardefs.h  history.h  keymaps.h  readline.h  rlconf.h  rlstdc.h
rltypedefs.h  tilde.h
luke at ThinkPad-W510:~/repos/ginac(master)$ ./configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking for g++... g++
checking whether the C++ compiler works... yes
checking for C++ compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking for style of include used by make... GNU
checking dependency style of g++... gcc3
checking how to run the C++ preprocessor... g++ -E
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking how to print strings... printf
checking for gcc... gcc
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking dependency style of gcc... gcc3
checking for a sed that does not truncate output... /bin/sed
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for fgrep... /bin/grep -F
checking for ld used by gcc... /usr/bin/ld
checking if the linker (/usr/bin/ld) is GNU ld... yes
checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B
checking the name lister (/usr/bin/nm -B) interface... BSD nm
checking whether ln -s works... yes
checking the maximum length of command line arguments... 1572864
checking whether the shell understands some XSI constructs... yes
checking whether the shell understands "+="... yes
checking how to convert x86_64-unknown-linux-gnu file names to
x86_64-unknown-linux-gnu format... func_convert_file_noop
checking how to convert x86_64-unknown-linux-gnu file names to
toolchain format... func_convert_file_noop
checking for /usr/bin/ld option to reload object files... -r
checking for objdump... objdump
checking how to recognize dependent libraries... pass_all
checking for dlltool... no
checking how to associate runtime and link libraries... printf %s\n
checking for ar... ar
checking for archiver @FILE support... @
checking for strip... strip
checking for ranlib... ranlib
checking command to parse /usr/bin/nm -B output from gcc object... ok
checking for sysroot... no
checking for mt... mt
checking if mt is a manifest tool... no
checking how to run the C preprocessor... gcc -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking for dlfcn.h... yes
checking for objdir... .libs
checking if gcc supports -fno-rtti -fno-exceptions... no
checking for gcc option to produce PIC... -fPIC -DPIC
checking if gcc PIC flag -fPIC -DPIC works... yes
checking if gcc static flag -static works... yes
checking if gcc supports -c -o file.o... yes
checking if gcc supports -c -o file.o... (cached) yes
checking whether the gcc linker (/usr/bin/ld -m elf_x86_64) supports
shared libraries... yes
checking whether -lc should be explicitly linked in... no
checking dynamic linker characteristics... GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... yes
checking how to run the C++ preprocessor... g++ -E
checking for ld used by g++... /usr/bin/ld -m elf_x86_64
checking if the linker (/usr/bin/ld -m elf_x86_64) is GNU ld... yes
checking whether the g++ linker (/usr/bin/ld -m elf_x86_64) supports
shared libraries... yes
checking for g++ option to produce PIC... -fPIC -DPIC
checking if g++ PIC flag -fPIC -DPIC works... yes
checking if g++ static flag -static works... yes
checking if g++ supports -c -o file.o... yes
checking if g++ supports -c -o file.o... (cached) yes
checking whether the g++ linker (/usr/bin/ld -m elf_x86_64) supports
shared libraries... yes
checking dynamic linker characteristics... (cached) GNU/Linux ld.so
checking how to hardcode library paths into programs... immediate
checking for flex... flex
checking lex output file root... lex.yy
checking lex library... -lfl
checking whether yytext is a pointer... yes
checking for bison... bison -y
checking for bison... /usr/bin/bison
checking for standard C++ header files... yes
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for CLN... yes
checking for ld used by GCC... /usr/bin/ld -m elf_x86_64
checking if the linker (/usr/bin/ld -m elf_x86_64) is GNU ld... yes
checking for shared library run path origin... done
checking for long long... yes
checking for unistd.h... (cached) yes
checking whether struct rusage is declared in <sys/resource.h>... yes
checking for tgetent... no
checking for tgetent in -lncurses... no
checking for tgetent in -ltermcap... no
checking readline/readline.h usability... yes
checking readline/readline.h presence... yes
checking for readline/readline.h... yes
checking readline/history.h usability... yes
checking readline/history.h presence... yes
checking for readline/history.h... yes
checking for version of libreadline... yes
checking for readline in -lreadline... no
checking for dlfcn.h... (cached) yes
checking for dlopen in -ldl... no
checking for dlopen... no
configure: WARNING: Could not found working dlopen().
GiNaC::compile_ex will be disabled.
checking for doxygen... /home/luke/usr/bin/doxygen
checking for latex... /home/luke/usr/texlive/2011/bin/x86_64-linux/latex
checking for pdflatex... /home/luke/usr/texlive/2011/bin/x86_64-linux/pdflatex
checking for makeindex... /home/luke/usr/texlive/2011/bin/x86_64-linux/makeindex
checking for makeinfo... /usr/bin/makeinfo
checking for dvips... /home/luke/usr/texlive/2011/bin/x86_64-linux/dvips
checking for fig2dev... /usr/bin/fig2dev
configure: creating ./config.status
config.status: creating Makefile
config.status: creating GiNaC.spec
config.status: creating ginac.pc
config.status: creating ginac/Makefile
config.status: creating check/Makefile
config.status: creating ginsh/Makefile
config.status: creating ginsh/ginsh.1
config.status: creating tools/Makefile
config.status: creating tools/viewgar.1
config.status: creating tools/ginac-excompiler
config.status: creating doc/Makefile
config.status: creating doc/examples/Makefile
config.status: creating doc/tutorial/Makefile
config.status: creating doc/reference/Makefile
config.status: creating doc/reference/DoxyfileHTML
config.status: creating doc/reference/DoxyfileTEX
config.status: creating doc/reference/DoxyfilePDF
config.status: creating doc/reference/Doxyfooter
config.status: creating config/config.h
config.status: config/config.h is unchanged
config.status: creating ginac/version.h
config.status: ginac/version.h is unchanged
config.status: executing depfiles commands
config.status: executing libtool commands

=== The following minor problems have been detected by configure.
=== Please check the messages below before running "make".
=== (see the section 'Common Problems' in the INSTALL file)

== ginsh will not compile, because libreadline could not be found.

Configuration of GiNaC 1.6.2 done. Now type "make".

Any ideas why configure wouldn't be finding readline or how to go
about solving this problem?

Also, I don't understand why a working dlopen() was not found.  I have
/usr/include/dlfcn.h, and I have successfully compiled code that makes
calls to dlopen() and friends.

Thanks,
~Luke


-- 
"Those who would give up essential liberty to purchase a little
temporary safety deserve neither liberty nor safety."

-- Benjamin Franklin, Historical Review of Pennsylvania, 1759