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llvm-project/clang/test/Sema/attr-visibility.c

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Complain about attempts to use 'protected' visibility on targets like Darwin that don't support it. We should also complain about invalid -fvisibility=protected, but that information doesn't seem to exist at the most appropriate time, so I've left a FIXME behind. llvm-svn: 149186
2012-01-29 09:20:30 +08:00
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsyntax-only -verify %s
void test0() __attribute__((visibility("default")));
void test1() __attribute__((visibility("hidden")));
void test2() __attribute__((visibility("internal")));
// rdar://problem/10753392
void test3() __attribute__((visibility("protected"))); // expected-warning {{target does not support 'protected' visibility; using 'default'}}
Reject cases like struct __attribute__((visibility("hidden"))) a; struct __attribute__((visibility("default"))) b; which gcc already rejects. llvm-svn: 155603
2012-04-26 09:26:03 +08:00
struct __attribute__((visibility("hidden"))) test4; // expected-note {{previous attribute is here}}
Extend the error about incompatible visibility attributes in different decls to work on function templates specializations. llvm-svn: 155943
2012-05-02 04:58:29 +08:00
struct test4;
Reject cases like struct __attribute__((visibility("hidden"))) a; struct __attribute__((visibility("default"))) b; which gcc already rejects. llvm-svn: 155603
2012-04-26 09:26:03 +08:00
struct __attribute__((visibility("default"))) test4; // expected-error {{visibility does not match previous declaration}}
Walk the decls looking for the last one that has an attribute. We do have to walk them, otherwise we cannot produce an error for both struct HIDDEN test4; // canonical struct test4; struct DEFAULT test4; and struct test5; // canonical struct HIDDEN test5; struct DEFAULT test5; llvm-svn: 156016
2012-05-03 04:36:57 +08:00
struct test5;
struct __attribute__((visibility("hidden"))) test5; // expected-note {{previous attribute is here}}
struct __attribute__((visibility("default"))) test5; // expected-error {{visibility does not match previous declaration}}
Process attributes in the order they appear in the source code. This make clang match gcc behavior for two conflicting visibilities in the same decl. It also makes handling of dllimport/dllexport more natural. As a bonus we now warn on the dllimport in void __attribute__((dllimport)) foo13(); void __attribute__((dllexport)) foo13(); as does gcc. llvm-svn: 156343
2012-05-08 07:58:18 +08:00
void test6() __attribute__((visibility("hidden"), // expected-note {{previous attribute is here}}
visibility("default"))); // expected-error {{visibility does not match previous declaration}}
Fix an old (2009) FIXME: // FIXME: This needs to happen before we merge declarations. Then, // let attribute merging cope with attribute conflicts. This was already being done for variables, but for functions we were merging then first and then applying the attributes. To avoid duplicating merging logic, some of the helpers in SemaDeclAttr.cpp become methods that can handle merging two attributes in one decl or inheriting attributes from one decl to another. With this change we are now able to produce errors for variables with incompatible visibility attributes or warn about unused dllimports in variables. This changes the attribute list iteration back to being in reverse source code order, as that matches what decl merging does and avoids differentiating the two cases is the merge*Attr methods. llvm-svn: 156531
2012-05-10 10:50:16 +08:00
extern int test7 __attribute__((visibility("default"))); // expected-note {{previous attribute is here}}
extern int test7 __attribute__((visibility("hidden"))); // expected-error {{visibility does not match previous declaration}}
Warn about visibility attributes in typedefs. llvm-svn: 156534
2012-05-10 11:01:34 +08:00
typedef int __attribute__((visibility("default"))) bar; // expected-warning {{visibility attribute ignored}}