jb-openssl at wisemo.com
Tue Sep 4 07:11:43 UTC 2018
On 04/09/2018 08:55, Wouter Verhelst wrote:
> On 9/3/18 9:05 PM, Thomás Inskip wrote:
>> Does anyone know how I can specify that a specific shared library (in
>> this case an engine) is dependent on a system-installed shared
>> library (i.e. not built along with openssl)?. Basically the
>> equivalent of LDFLAGS += -lsomelib
> The GNU runtime dynamic library will honor DT_NEEDED flags of
> libraries, too. That is, you can just do LDFLAGS += -lsomelib on a
> library target and it will work. Check libgtk-3.so, for instance:
> objdump -x /usr/lib/x86_64-linux-gnu/libgtk-3.so
> will show a bunch of lines like...
> Dynamic Section:
> NEEDED libgdk-3.so.0
> NEEDED libgmodule-2.0.so.0
> NEEDED libpangocairo-1.0.so.0
> NEEDED libX11.so.6
> NEEDED libXi.so.6
> NEEDED libXcomposite.so.1
> NEEDED libXdamage.so.1
> Meaning, all these libraries need to be loaded for libgtk-3.so to work.
> Beware gotchas:
> - Not all rtdl implementations do so, so if you're not using a GNU
> platform (e.g., Linux), then check the documentation of your runtime
> dynamic linker.
> - This works for shared libraries, but not for static ones.
Please note that the OP is apparently asking how to specify
-lsomelib using the OpenSSL-specific build system, not the
general meaning of using shared libraries on POSIX systems.
Jakob Bohm, CIO, Partner, WiseMo A/S. https://www.wisemo.com
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