https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67307
Bug ID: 67307
Summary: FE considers 'inline int foo ()' as always-inline,
inlining not disabled via -fno-early-inlining
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
CC: hubicka at gcc dot gnu.org, jsm28 at gcc dot gnu.org
Target Milestone: ---
inline int foo (int i) { return i; }
runs into c-decl.c
/* For GNU C extern inline functions disregard inline limits. */
if (DECL_EXTERNAL (fndecl)
&& DECL_DECLARED_INLINE_P (fndecl))
DECL_DISREGARD_INLINE_LIMITS (fndecl) = 1;
but not with -std=gnu89, only with -std=gnu99. This means it is considered
"always-inline" by inline_always_inline_functions which means it is still
inlined early even with -fno-early-inlining.
Not sure if the FE behavior is desired - we have DECL_DECLARED_INLINE_P
to guide general inlining. DECL_DISREGARD_INLINE_LIMITS should really
be only used if "always-inline" semantics are to be wanted by the FE.
