re PR c/16622 ([C99] extern inline is handled wrong in C99 mode)
* c-decl.c (grokdeclarator): Don't set DECL_EXTERNAL on inline static functions in c99 mode. PR 16622 * doc/extend.texi (Inline): Update. * c-tree.h (struct language_function): Remove field 'extern_inline'. * c-decl.c (current_extern_inline): Delete. (pop_scope): Adjust test for an undefined nested function. Add warning about undeclared inline function. (diagnose_mismatched_decls): Update comments. Disallow overriding of inline functions in a translation unit in C99. Allow inline declarations in C99 at any time. (merge_decls): Boolize variables. Handle C99 'extern inline' semantics. (grokdeclarator): Set DECL_EXTERNAL here for functions. Handle C99 inline semantics. (start_function): Don't clear current_extern_inline. Don't set DECL_EXTERNAL. (c_push_function_context): Don't push current_extern_inline. (c_pop_function_context): Don't restore current_extern_inline. PR 11377 * c-typeck.c (build_external_ref): Warn about static variables used in extern inline functions. * c-decl.c (start_decl): Warn about static variables declared in extern inline functions. From-SVN: r118356
This commit is contained in:
Geoffrey Keating
Geoffrey Keating
parent
682d039597
commit
71113fcd70
@ -1,3 +1,32 @@
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2006-10-31 Geoffrey Keating <geoffk@apple.com>
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* c-decl.c (grokdeclarator): Don't set DECL_EXTERNAL on
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inline static functions in c99 mode.
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PR 16622
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* doc/extend.texi (Inline): Update.
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* c-tree.h (struct language_function): Remove field 'extern_inline'.
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* c-decl.c (current_extern_inline): Delete.
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(pop_scope): Adjust test for an undefined nested function.
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Add warning about undeclared inline function.
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(diagnose_mismatched_decls): Update comments. Disallow overriding
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of inline functions in a translation unit in C99. Allow inline
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declarations in C99 at any time.
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(merge_decls): Boolize variables. Handle C99 'extern inline'
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semantics.
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(grokdeclarator): Set DECL_EXTERNAL here for functions. Handle
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C99 inline semantics.
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(start_function): Don't clear current_extern_inline. Don't set
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DECL_EXTERNAL.
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(c_push_function_context): Don't push current_extern_inline.
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(c_pop_function_context): Don't restore current_extern_inline.
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PR 11377
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* c-typeck.c (build_external_ref): Warn about static variables
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used in extern inline functions.
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* c-decl.c (start_decl): Warn about static variables declared
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in extern inline functions.
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2006-10-31 Roger Sayle <roger@eyesopen.com>
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PR middle-end/23470
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127
gcc/c-decl.c
127
gcc/c-decl.c
@ -154,10 +154,6 @@ int current_function_returns_abnormally;
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static int warn_about_return_type;
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/* Nonzero when starting a function declared `extern inline'. */
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static int current_extern_inline;
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/* Nonzero when the current toplevel function contains a declaration
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of a nested function which is never defined. */
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@ -797,11 +793,22 @@ pop_scope (void)
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&& DECL_ABSTRACT_ORIGIN (p) != p)
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TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p)) = 1;
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if (!DECL_EXTERNAL (p)
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&& DECL_INITIAL (p) == 0)
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&& !DECL_INITIAL (p)
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&& scope != file_scope
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&& scope != external_scope)
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{
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error ("nested function %q+D declared but never defined", p);
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undef_nested_function = true;
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}
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/* C99 6.7.4p6: "a function with external linkage... declared
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with an inline function specifier ... shall also be defined in the
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same translation unit." */
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else if (DECL_DECLARED_INLINE_P (p)
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&& TREE_PUBLIC (p)
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&& !DECL_INITIAL (p)
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&& flag_isoc99)
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pedwarn ("inline function %q+D declared but never defined", p);
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goto common_symbol;
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case VAR_DECL:
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@ -1292,10 +1299,11 @@ diagnose_mismatched_decls (tree newdecl, tree olddecl,
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/* Function declarations can either be 'static' or 'extern' (no
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qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
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can never conflict with each other on account of linkage (6.2.2p4).
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Multiple definitions are not allowed (6.9p3,5) but GCC permits
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two definitions if one is 'extern inline' and one is not. The non-
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extern-inline definition supersedes the extern-inline definition. */
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can never conflict with each other on account of linkage
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(6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
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gnu89 mode permits two definitions if one is 'extern inline' and
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one is not. The non- extern-inline definition supersedes the
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extern-inline definition. */
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else if (TREE_CODE (newdecl) == FUNCTION_DECL)
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{
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@ -1321,16 +1329,11 @@ diagnose_mismatched_decls (tree newdecl, tree olddecl,
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{
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/* If both decls are in the same TU and the new declaration
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isn't overriding an extern inline reject the new decl.
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When we handle c99 style inline rules we'll want to reject
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the following:
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DECL_EXTERN_INLINE (olddecl)
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&& !DECL_EXTERN_INLINE (newdecl)
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if they're in the same translation unit. Until we implement
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the full semantics we accept the construct. */
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if (!(DECL_EXTERN_INLINE (olddecl)
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&& !DECL_EXTERN_INLINE (newdecl))
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In c99, no overriding is allowed in the same translation
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unit. */
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if ((!DECL_EXTERN_INLINE (olddecl)
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|| DECL_EXTERN_INLINE (newdecl)
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|| flag_isoc99)
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&& same_translation_unit_p (newdecl, olddecl))
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{
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error ("redefinition of %q+D", newdecl);
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@ -1521,9 +1524,13 @@ diagnose_mismatched_decls (tree newdecl, tree olddecl,
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??? Should we still warn about this now we have unit-at-a-time
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mode and can get it right?
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Definitely don't complain if the decls are in different translation
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units. */
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units.
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C99 permits this, so don't warn in that case. (The function
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may not be inlined everywhere in function-at-a-time mode, but
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we still shouldn't warn.) */
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if (DECL_DECLARED_INLINE_P (newdecl) && !DECL_DECLARED_INLINE_P (olddecl)
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&& same_translation_unit_p (olddecl, newdecl))
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&& same_translation_unit_p (olddecl, newdecl)
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&& ! flag_isoc99)
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{
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if (TREE_USED (olddecl))
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{
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@ -1600,12 +1607,13 @@ diagnose_mismatched_decls (tree newdecl, tree olddecl,
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static void
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merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
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{
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int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
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&& DECL_INITIAL (newdecl) != 0);
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int new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
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&& TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
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int old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
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&& TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
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bool new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
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&& DECL_INITIAL (newdecl) != 0);
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bool new_is_prototype = (TREE_CODE (newdecl) == FUNCTION_DECL
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&& TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0);
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bool old_is_prototype = (TREE_CODE (olddecl) == FUNCTION_DECL
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&& TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0);
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bool extern_changed = false;
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/* For real parm decl following a forward decl, rechain the old decl
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in its new location and clear TREE_ASM_WRITTEN (it's not a
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@ -1752,6 +1760,18 @@ merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
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}
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}
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/* In c99, 'extern' declaration before (or after) 'inline' means this
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function is not DECL_EXTERNAL. */
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if (TREE_CODE (newdecl) == FUNCTION_DECL
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&& (DECL_DECLARED_INLINE_P (newdecl)
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|| DECL_DECLARED_INLINE_P (olddecl))
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&& (!DECL_DECLARED_INLINE_P (newdecl)
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|| !DECL_DECLARED_INLINE_P (olddecl)
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|| !DECL_EXTERNAL (olddecl))
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&& DECL_EXTERNAL (newdecl)
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&& flag_isoc99)
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DECL_EXTERNAL (newdecl) = 0;
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if (DECL_EXTERNAL (newdecl))
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{
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TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
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@ -1844,6 +1864,8 @@ merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
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}
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}
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extern_changed = DECL_EXTERNAL (olddecl) && !DECL_EXTERNAL (newdecl);
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/* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
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But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
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{
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@ -1886,6 +1908,13 @@ merge_decls (tree newdecl, tree olddecl, tree newtype, tree oldtype)
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|| (TREE_CODE (olddecl) == VAR_DECL
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&& TREE_STATIC (olddecl))))
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make_decl_rtl (olddecl);
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/* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
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and the definition is coming from the old version, cgraph needs
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to be called again. */
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if (extern_changed && !new_is_definition
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&& TREE_CODE (olddecl) == FUNCTION_DECL && DECL_INITIAL (olddecl))
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cgraph_finalize_function (olddecl, false);
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}
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/* Handle when a new declaration NEWDECL has the same name as an old
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@ -3282,6 +3311,17 @@ start_decl (struct c_declarator *declarator, struct c_declspecs *declspecs,
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warning (OPT_Wattributes, "inline function %q+D given attribute noinline",
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decl);
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/* C99 6.7.4p3: An inline definition of a function with external
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linkage shall not contain a definition of a modifiable object
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with static storage duration... */
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if (TREE_CODE (decl) == VAR_DECL
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&& current_scope != file_scope
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&& TREE_STATIC (decl)
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&& DECL_DECLARED_INLINE_P (current_function_decl)
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&& DECL_EXTERNAL (current_function_decl))
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pedwarn ("%q+D is static but declared in inline function %qD "
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"which is not static", decl, current_function_decl);
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/* Add this decl to the current scope.
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TEM may equal DECL or it may be a previous decl of the same name. */
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tem = pushdecl (decl);
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@ -4726,8 +4766,15 @@ grokdeclarator (const struct c_declarator *declarator,
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GCC to signify a forward declaration of a nested function. */
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if (storage_class == csc_auto && current_scope != file_scope)
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DECL_EXTERNAL (decl) = 0;
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/* In C99, a function which is declared 'inline' with 'extern'
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is not an external reference (which is confusing). It
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means that the later definition of the function must be output
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in this file, C99 6.7.4p6. In GNU C89, a function declared
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'extern inline' is an external reference. */
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else if (declspecs->inline_p && storage_class != csc_static)
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DECL_EXTERNAL (decl) = (storage_class == csc_extern) == !flag_isoc99;
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else
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DECL_EXTERNAL (decl) = 1;
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DECL_EXTERNAL (decl) = !initialized;
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/* Record absence of global scope for `static' or `auto'. */
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TREE_PUBLIC (decl)
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@ -4757,11 +4804,7 @@ grokdeclarator (const struct c_declarator *declarator,
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the abstract origin pointing between the declarations,
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which will confuse dwarf2out. */
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if (initialized)
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{
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DECL_INLINE (decl) = 1;
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if (storage_class == csc_extern)
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current_extern_inline = 1;
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}
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DECL_INLINE (decl) = 1;
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}
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/* If -finline-functions, assume it can be inlined. This does
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two things: let the function be deferred until it is actually
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@ -5259,12 +5302,15 @@ start_struct (enum tree_code code, tree name)
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error ("nested redefinition of %<union %E%>", name);
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else
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error ("nested redefinition of %<struct %E%>", name);
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/* Don't create structures that contain themselves. */
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ref = NULL_TREE;
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}
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}
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else
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{
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/* Otherwise create a forward-reference just so the tag is in scope. */
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/* Otherwise create a forward-reference just so the tag is in scope. */
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if (ref == NULL_TREE || TREE_CODE (ref) != code)
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{
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ref = make_node (code);
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pushtag (name, ref);
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}
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@ -5956,7 +6002,6 @@ start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
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current_function_returns_null = 0;
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current_function_returns_abnormally = 0;
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warn_about_return_type = 0;
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current_extern_inline = 0;
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c_switch_stack = NULL;
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nstack_se = XOBNEW (&parser_obstack, struct c_label_context_se);
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@ -6108,12 +6153,6 @@ start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
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warning (OPT_Wmissing_declarations,
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"%q+D was used with no declaration before its definition", decl1);
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/* This is a definition, not a reference.
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So normally clear DECL_EXTERNAL.
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However, `extern inline' acts like a declaration
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except for defining how to inline. So set DECL_EXTERNAL in that case. */
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DECL_EXTERNAL (decl1) = current_extern_inline;
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/* This function exists in static storage.
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(This does not mean `static' in the C sense!) */
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TREE_STATIC (decl1) = 1;
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@ -6846,7 +6885,6 @@ c_push_function_context (struct function *f)
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p->returns_null = current_function_returns_null;
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p->returns_abnormally = current_function_returns_abnormally;
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p->warn_about_return_type = warn_about_return_type;
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p->extern_inline = current_extern_inline;
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}
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/* Restore the variables used during compilation of a C function. */
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@ -6875,7 +6913,6 @@ c_pop_function_context (struct function *f)
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current_function_returns_null = p->returns_null;
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current_function_returns_abnormally = p->returns_abnormally;
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warn_about_return_type = p->warn_about_return_type;
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current_extern_inline = p->extern_inline;
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f->language = NULL;
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}
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@ -384,7 +384,6 @@ struct language_function GTY(())
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int returns_null;
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int returns_abnormally;
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int warn_about_return_type;
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int extern_inline;
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};
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/* Save lists of labels used or defined in particular contexts.
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@ -2109,6 +2109,17 @@ build_external_ref (tree id, int fun, location_t loc)
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if (context != 0 && context != current_function_decl)
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DECL_NONLOCAL (ref) = 1;
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}
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/* C99 6.7.4p3: An inline definition of a function with external
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linkage ... shall not contain a reference to an identifier with
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internal linkage. */
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else if (current_function_decl != 0
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&& DECL_DECLARED_INLINE_P (current_function_decl)
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&& DECL_EXTERNAL (current_function_decl)
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&& VAR_OR_FUNCTION_DECL_P (ref)
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&& (TREE_CODE (ref) != VAR_DECL || TREE_STATIC (ref))
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&& ! TREE_PUBLIC (ref))
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pedwarn ("%H%qD is static but used in inline function %qD "
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"which is not static", &loc, ref, current_function_decl);
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return ref;
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}
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@ -1,3 +1,18 @@
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2006-10-31 Geoffrey Keating <geoffk@apple.com>
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* gcc.dg/inline-16.c: New.
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PR 16622
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* gcc.dg/inline-10.c (main): Don't declare 'main' inline without
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defining it.
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* gcc.dg/inline-13.c: New.
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* gcc.dg/inline-14.c: New.
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* gcc.dg/inline-15.c: New.
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PR 11377
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* gcc.dg/inline6.c: New.
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* gcc.dg/inline7.c: New.
|
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|
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2006-10-31 Roger Sayle <roger@eyesopen.com>
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PR middle-end/23470
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@ -3,4 +3,4 @@
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/* { dg-do compile } */
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/* { dg-options "-std=gnu99 -ffreestanding -pedantic-errors" } */
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inline int main (void);
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inline int main (void) { return 1; }
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56
gcc/testsuite/gcc.dg/inline-13.c
Normal file
56
gcc/testsuite/gcc.dg/inline-13.c
Normal file
@ -0,0 +1,56 @@
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/* Verify basic C99 inline functionality. */
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/* { dg-do compile } */
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/* { dg-options "-std=c99" } */
|
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/* { dg-final { scan-assembler-not "dontgenerate" } } */
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/* { dg-final { scan-assembler "func1" } } */
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/* { dg-final { scan-assembler "func2" } } */
|
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/* { dg-final { scan-assembler "func3" } } */
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/* { dg-final { scan-assembler "func4" } } */
|
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/* { dg-final { scan-assembler "func5" } } */
|
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/* { dg-final { scan-assembler "func6" } } */
|
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/* { dg-final { scan-assembler "func7" } } */
|
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/* { dg-final { scan-assembler "func8" } } */
|
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/* { dg-final { scan-assembler "func9" } } */
|
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|
||||
inline int dontgenerate1 (void)
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{
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return 1;
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}
|
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|
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inline int dontgenerate2 (void);
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inline int dontgenerate2 (void)
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{
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return 2;
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}
|
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|
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inline int dontgenerate3 (void)
|
||||
{
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return 3;
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}
|
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inline int dontgenerate3 (void);
|
||||
|
||||
extern inline int func1 (void) { return 1; }
|
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|
||||
extern inline int func2 (void);
|
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inline int func2 (void) { return 2; }
|
||||
|
||||
inline int func3 (void) { return 3; }
|
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extern inline int func3 (void);
|
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|
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inline int func4 (void);
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extern inline int func4 (void) { return 4; }
|
||||
|
||||
extern inline int func5 (void) { return 5; }
|
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inline int func5 (void);
|
||||
|
||||
extern int func6 (void);
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inline int func6 (void) { return 6; }
|
||||
|
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inline int func7 (void) { return 7; }
|
||||
extern int func7 (void);
|
||||
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||||
inline int func8 (void);
|
||||
extern int func8 (void) { return 8; }
|
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|
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extern int func9 (void) { return 9; }
|
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inline int func9 (void);
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23
gcc/testsuite/gcc.dg/inline-14.c
Normal file
23
gcc/testsuite/gcc.dg/inline-14.c
Normal file
@ -0,0 +1,23 @@
|
||||
/* Check that you can't redefine a C99 inline function. */
|
||||
/* { dg-do compile } */
|
||||
/* { dg-options "-std=c99" } */
|
||||
|
||||
extern inline int func1 (void)
|
||||
{ /* { dg-error "previous definition" } */
|
||||
return 1;
|
||||
}
|
||||
|
||||
inline int func1 (void)
|
||||
{ /* { dg-error "redefinition" } */
|
||||
return 1;
|
||||
}
|
||||
|
||||
inline int func2 (void)
|
||||
{ /* { dg-error "previous definition" } */
|
||||
return 2;
|
||||
}
|
||||
|
||||
inline int func2 (void)
|
||||
{ /* { dg-error "redefinition" } */
|
||||
return 2;
|
||||
}
|
||||
7
gcc/testsuite/gcc.dg/inline-15.c
Normal file
7
gcc/testsuite/gcc.dg/inline-15.c
Normal file
@ -0,0 +1,7 @@
|
||||
/* Check that an error message is produced when a C99 inline function
|
||||
is never defined. */
|
||||
/* { dg-do compile } */
|
||||
/* { dg-options "-std=c99" } */
|
||||
|
||||
extern inline int func1 (void); /* { dg-error "never defined" } */
|
||||
inline int func2 (void); /* { dg-error "never defined" } */
|
||||
21
gcc/testsuite/gcc.dg/inline-16.c
Normal file
21
gcc/testsuite/gcc.dg/inline-16.c
Normal file
@ -0,0 +1,21 @@
|
||||
/* { dg-do link } */
|
||||
/* { dg-options "-std=c99" } */
|
||||
|
||||
static inline int
|
||||
func1(const volatile void * base, int byteOffset)
|
||||
{
|
||||
volatile int *addr = (volatile int *)((int)base + byteOffset);
|
||||
return *addr;
|
||||
}
|
||||
|
||||
static inline int
|
||||
func2(int data)
|
||||
{
|
||||
return func1(&data, 0);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
int b = func2(argc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
14
gcc/testsuite/gcc.dg/inline6.c
Normal file
14
gcc/testsuite/gcc.dg/inline6.c
Normal file
@ -0,0 +1,14 @@
|
||||
/* { dg-do compile } */
|
||||
/* { dg-options "-std=gnu89" } */
|
||||
static int i;
|
||||
extern int j;
|
||||
extern inline int func1 (void) {
|
||||
return i++; /* { dg-warning "static" } */
|
||||
}
|
||||
extern inline int func2 (void) {
|
||||
return j++;
|
||||
}
|
||||
inline int func3 (void)
|
||||
{
|
||||
return i++;
|
||||
}
|
||||
9
gcc/testsuite/gcc.dg/inline7.c
Normal file
9
gcc/testsuite/gcc.dg/inline7.c
Normal file
@ -0,0 +1,9 @@
|
||||
/* { dg-do compile } */
|
||||
/* { dg-options "-std=gnu89" } */
|
||||
extern inline void func1 (void) {
|
||||
static int i; /* { dg-warning "static" } */
|
||||
}
|
||||
inline void func3 (void)
|
||||
{
|
||||
static int i;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user