https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63877
Bug ID: 63877
Summary: - -Wmissing-declarations produces false alarms for C99
inline functions
Product: gcc
Version: 4.9.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: eggert at gnu dot org
This is a followup to PR c/54113, which was about -Wmissing-prototypes. This
followup bug report is the same, except it is about -Wmissing-declarations.
-Wmissing-declarations produces false alarms for C99-style
inline functions. We can use the same example as for PR c/54113.
Suppose foo.h contains this:
inline float square(float x) {return x*x;}
inline float cube(float x) {return x*x*x;}
and foo.c contains this:
#include "foo.h"
extern float square(float x);
extern float cube(float x);
Then the command:
gcc -c -Wmissing-declarations foo.c
outputs:
In file included from foo.c:1:0:
foo.h:1:14: warning: no previous declaration for 'square'
[-Wmissing-declarations]
inline float square(float x) {return x*x;}
^
foo.h:2:14: warning: no previous declaration for 'cube'
[-Wmissing-declarations]
inline float cube(float x) {return x*x*x;}
^
The diagnostics should not be output, as this is the normal
way to use inline functions in C.
To fix this, I suggest that the diagnostic be suppressed
for inline functions, at least for C99 mode.
