Section 6.7.4 paragraph 3 of the ISO C99 standard states that:
An inline definition of a function with external
linkage ... shall not contain a reference to an identifier with
internal linkage.
GCC has code to check for this condition, but it does not work in C99 mode.
Reproduce by:
% cat iso-c99-test.c
static int a = 7;
extern inline int foo (void) { return a; }
int main (void) { return foo (); }
% gcc -c iso-c99-test.c
iso-c99-test.c:2:39: warning: 'a' is static but used in inline function 'foo'
which is not static [enabled by default]
% gcc -c -std=c99 iso-c99-test.c
%
--
Summary: ISO C99 6.7.4p3 not obeyed in C99 mode
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: nickc at redhat dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44438
