Why constructor still be exported when I using -fvisibility=hidden

Question

I have a class A:

class A
{
public:
   A() {}
   virtual ~A() {}

   void Func();
};

and another class M using A. I want to create libM.so which hidden all A's symbols. I using the following script to compile it:

g++ -c A.cc -fPIC -fvisibility=hidden
g++ -c M.cc -fPIC
g++ -shared -z defs -o libM.so M.o A.o

But when I using "nm -DC libM.so", it still has

0000000000000c78 W A::A()
0000000000000c78 W A::A()

I search this question on google and found another gcc option: "-fvisibility-inlines-hidden" to hidden inline functions, but I still got the same result even add this option when compile A.o

g++ -c A.cc -fPIC -fvisibility=hidden -fvisibility-inlines-hidden

Why "-fvisibility-inlines-hidden" doesn't have effect? How do I prevent A::A() to appear in libM.so's export symbol? Thank you very much!

The inline constructor will be defined in both translation units, so presumably you need the compiler option for both, not just A.cc. (Not an answer since I don't have a computer available to test my guess at the moment) — Mike Seymour
– Mike Seymour, Commented Jan 30, 2013 at 4:32
Thank you very much! Yes, it is right. I should add -fvisibility-inlines-hidden when I compile M.cc. — cgspwei
– cgspwei, Commented Jan 30, 2013 at 4:39
Please answer your own question with what you've found out and accept it to close this issue. — vonbrand
– vonbrand, Commented Jan 30, 2013 at 12:09

cgspwei · Accepted Answer · 2013-01-31 04:40:59Z

1

Thanks to Mike Seymour. I should add -fvisibility-inlines-hidden when I compile M.cc

g++ -c A.cc -fPIC -fvisibility=hidden -fvisibility-inlines-hidden
g++ -c M.cc -fPIC -fvisibility-inlines-hidden
g++ -shared -z defs -o libM.so M.o A.o

answered Jan 31, 2013 at 4:40

cgspwei

635 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

flm8620 Over a year ago

But I tried, and found that -fvisibility-inlines-hidden cannot hide A's symbol. Instead, only use -fvisibility=hidden for the first two line will remove A's symbol in libM.so. I'm using gcc 5.4.0

Collectives™ on Stack Overflow

Why constructor still be exported when I using -fvisibility=hidden

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related