Consider the following example:

	% cat -n deprdecl.cpp
	     1  struct S {
	     2      void bar();
	     3
	     4      __attribute__((deprecated("use bar() instead.")))
	     5      virtual void foo();
	     6  };
	     7
	     8  inline void S::foo() { bar(); }
	     9
	    10  int main()
	    11  {
	    12      return 0;
	    13  }
	% g++-5 -c -Wall deprdecl.cpp
	deprdecl.cpp:13:1: warning: 'virtual void S::foo()' is deprecated: use bar() instead. [-Wdeprecated-declarations]
	 }
	 ^
	deprdecl.cpp:8:13: note: declared here
	 inline void S::foo() { bar(); }
		     ^

I believe this warning shouldn't appear when the deprecated method is just being defined and not used. Notice that it indeed does not appear if the method is either not virtual (i.e. remove "virtual" in line 5) or is defined inline (i.e. move the body from line 8 to line 5). Nor does it appear with 4.9.

Also notice that the warning location is always the last line of the last function in the file and has nothing to do with the function it complains about.

This warning may look like not a big deal, but when compiling my real code it occurs many thousands times making it impossible to use deprecated attribute with g++ 5.1.

Compiler information:

	% g++-5 -v
	Using built-in specs.
	COLLECT_GCC=g++-5
	COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
	Target: x86_64-linux-gnu
	Configured with: ../src/configure -v --with-pkgversion='Debian 5.1.1-2' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=c++11 --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
	Thread model: posix
	gcc version 5.1.1 (Debian 5.1.1-2)