linker input file unused because linking not done

[spfhi]

in extension.cpp I need to invoke a xx.a static library.

when I execute make,I met this error:
g++ -Wall -c -I. -I/data/yangrenqiang/vad_php_cpp/vad/lib/ -O2 -std=c++11 -fpic -o vad.o vad.cpp vad.a
g++: warning: vad.a: linker input file unused because linking not done

if you kown how to import static library vad.a,please tell me.

thanks.

[sjinks]

g++ -c means "compile the source file". If you meant to link it, consider removing -c from the command line.

[spfhi]

But if I remove -c,It will report error like this:

vad.cpp:(.text+0xd4): undefined reference to Php::Namespace::add(char const*, Php::Value (* const&)(Php::Parameters&), std::initializer_listPhp::Argument const&)'
vad.cpp:(.text+0xea): undefined reference to Php::Extension::module()' vad.cpp:(.text+0x113): undefined reference to Php::Extension::Extension(char const*, char const*, int)'
vad.cpp:(.text+0x126): undefined reference to Php::Extension::~Extension()'

Because I need invoke some function of a static library(xxx.a) in vad.cpp which is extension's file.So I don't know how to do?

[Prasaddiwalkar]

@Renqiangme Did you figure out the solution for this issue?

I am also facing same issue