Cannot build shared library using MSYS64

[velteyn]

Hello Im building the libray using MSYS2 (MSYS64) on windows and I need the shared library . It seems that the system builds the static library .a only...

The configurations is this

 ./configure -prefix=/usr --enable-shared --with-aix-soname=both
configure: loading site script /etc/config.site
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 for gcc... gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.exe
checking for suffix of executables... .exe
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 gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether gcc understands -c and -o together... yes
checking whether make supports the include directive... yes (GNU style)
checking dependency style of gcc... gcc3
checking for g++... g++
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking dependency style of g++... gcc3
checking build system type... x86_64-pc-msys
checking host system type... x86_64-pc-msys
checking how to print strings... printf
checking for a sed that does not truncate output... /usr/bin/sed
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for fgrep... /usr/bin/grep -F
checking for ld used by gcc... /usr/x86_64-pc-msys/bin/ld.exe
checking if the linker (/usr/x86_64-pc-msys/bin/ld.exe) 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... no, using cp -pR
checking the maximum length of command line arguments... 24000
checking how to convert x86_64-pc-msys file names to x86_64-pc-msys format... func_convert_file_noop
checking how to convert x86_64-pc-msys file names to toolchain format... func_convert_file_noop
checking for /usr/x86_64-pc-msys/bin/ld.exe option to reload object files... -r
checking for objdump... objdump
checking how to recognize dependent libraries... unknown
checking for dlltool... dlltool
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 a working dd... /usr/bin/dd
checking how to truncate binary pipes... /usr/bin/dd bs=4096 count=1
checking for mt... no
checking if : 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/x86_64-pc-msys/bin/ld.exe) supports shared libraries... yes
checking whether -lc should be explicitly linked in... yes
checking dynamic linker characteristics... no
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... yes
checking if libtool supports shared libraries... no
checking whether to build shared libraries... no
checking whether to build static libraries... yes
checking how to run the C++ preprocessor... g++ -E
checking for ld used by g++... /usr/x86_64-pc-msys/bin/ld.exe
checking if the linker (/usr/x86_64-pc-msys/bin/ld.exe) is GNU ld... yes
checking whether the g++ linker (/usr/x86_64-pc-msys/bin/ld.exe) supports shared libraries... no
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/x86_64-pc-msys/bin/ld.exe) supports shared libraries... no
checking dynamic linker characteristics... no
checking how to hardcode library paths into programs... immediate
checking endian.h usability... yes
checking endian.h presence... yes
checking for endian.h... yes
checking fcntl.h usability... yes
checking fcntl.h presence... yes
checking for fcntl.h... yes
checking locale.h usability... yes
checking locale.h presence... yes
checking for locale.h... yes
checking sched.h usability... yes
checking sched.h presence... yes
checking for sched.h... yes
checking for unistd.h... (cached) yes
checking sys/param.h usability... yes
checking sys/param.h presence... yes
checking for sys/param.h... yes
checking for sys/stat.h... (cached) yes
checking sys/time.h usability... yes
checking sys/time.h presence... yes
checking for sys/time.h... yes
checking for sys/types.h... (cached) yes
checking for int32_t... yes
checking for uint32_t... yes
checking for uint16_t... yes
checking for uint8_t... yes
checking for unsigned long long int... yes
checking for long long int... yes
checking for inline... inline
checking for close... yes
checking for getpid... yes
checking for gettimeofday... yes
checking for localeconv... yes
checking for open... yes
checking for read... yes
checking for sched_yield... yes
checking for strtoll... yes
checking for gcc __sync builtins... yes
checking for gcc __atomic builtins... yes
checking for -Bsymbolic-functions linker flag... yes
checking for -Wno-format-truncation... yes
checking that generated files are newer than configure... done
configure: creating ./config.status

As you can see g++ linker (/usr/x86_64-pc-msys/bin/ld.exe) supports shared libraries... no but gcc linker (/usr/x86_64-pc-msys/bin/ld.exe) supports shared libraries... yes and finally hecking if libtool supports shared libraries... no

Is this an incompatibility with MSYS2 or my toolchain is broken ? Thank you

[akheron]

Unfortunately I have no idea whether libtool can generate shared libraries (DLLs?) on Windows. Jansson also supports CMake, have you tried it?