Re: [ft] Linking against freetype in Linux

[Nelson H. F. Beebe]

>> $ nm /lib/x86_64-linux-gnu/libfreetype.so
>> nm: /lib/x86_64-linux-gnu/libfreetype.so: no symbols

Add the -D (--dynamic) option; I wish that nm wasn't so stupid to need
it:

        % nm -D /usr/lib64/libfreetype.so.6.14.0 | grep ' T ' | sort -k3,3
        00000000000771a0 T FTC_CMapCache_Lookup
        0000000000076e20 T FTC_CMapCache_New
        0000000000075fe0 T FTC_ImageCache_Lookup
        ...
        000000000001c1d0 T FT_Hypot
        00000000000170f0 T FT_Init_FreeType
        0000000000023dc0 T FT_Library_SetLcdFilter
        ...

So, on my CentOS 7 (roughly the same as Red Hat 7) GNU/Linux
workstation, our shared library has the symbol FT_Init_FreeType that
your linker could not find.

--------------------------------------------------

P.S. One more thing to check when linking fails to find an expected
function in a library is the freshness of the loader cache: as root,
run

        # ldconfig

to update the cache.

You can also run the system call tracer to find out where library
files are looked for, and whether they are found, and then
successfully opened:

        % strace -o foo.log -f cc foo.c -lbar
        % fgrep -i 'open(' foo.log
        % fgrep -i 'stat(' foo.log

-------------------------------------------------------------------------------
- Nelson H. F. Beebe                    Tel: +1 801 581 5254                  -
- University of Utah                    FAX: +1 801 581 4148                  -
- Department of Mathematics, 110 LCB    Internet e-mail: address@hidden  -
- 155 S 1400 E RM 233                       address@hidden  address@hidden -
- Salt Lake City, UT 84112-0090, USA    URL: http://www.math.utah.edu/~beebe/ -
-------------------------------------------------------------------------------