Re: Linker errors while creating a PostgreSQL C extension function.

TalGloz wrote:

> If yes then the -lseal is added with the $(LDFLAGS) at the end of the
> command.

But it doesn't happen because LDFLAGS is overriden by the
makefile included just after you set it. The relevant part
copy-pasted from your mail:

LDFLAGS = -L$(INCLUDE_SEAL_LIB) -llibseal.a -lpthread
include $(PGXS)
seal_diff_cpp.so: seal_diff_cpp.o
$(CXX) -Wl,--no-undefined -shared -o seal_diff_cpp.so
seal_diff_cpp.o $(LDFLAGS)

As as solution, you could leave LDFLAGS alone and use a different
variable, or include $(PGXS) first and *append* your options to
LDFLAGS if your prefer.
For instance (replacing -llibseal.a with -lseal while at it):

SEAL_LDFLAGS = -L$(INCLUDE_SEAL_LIB) -lseal -lpthread
include $(PGXS)
seal_diff_cpp.so: seal_diff_cpp.o
$(CXX) -Wl,--no-undefined -shared -o seal_diff_cpp.so
seal_diff_cpp.o $(LDFLAGS) $(SEAL_LDFLAGS)

Best regards,
--
Daniel Vérité
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Twitter: @DanielVerite