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.
Regards,
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.
Enjoy
Jakob
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