837d5de330
gcc supports this behavior and it is pervasively used inside the Linux kernel. Note that both gcc and clang will reject code that attempts to do this in a C++ language mode. This fixes PR17998. llvm-svn: 212631
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
// RUN: %clang_cc1 -triple x86_64-pc-linux -fsyntax-only -verify -emit-llvm-only %s
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void f1(void) __attribute__((alias("g1")));
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void g1(void) {
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}
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void f2(void) __attribute__((alias("g2"))); // expected-error {{alias must point to a defined variable or function}}
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void f3(void) __attribute__((alias("g3"))); // expected-error {{alias must point to a defined variable or function}}
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void g3(void);
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void f4() __attribute__((alias("g4")));
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void g4() {}
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void h4() __attribute__((alias("f4")));
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void f5() __attribute__((alias("g5")));
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void h5() __attribute__((alias("f5")));
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void g5() {}
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void g6() {}
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void f6() __attribute__((alias("g6")));
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void h6() __attribute__((alias("f6")));
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void g7() {}
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void h7() __attribute__((alias("f7")));
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void f7() __attribute__((alias("g7")));
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void h8() __attribute__((alias("f8")));
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void g8() {}
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void f8() __attribute__((alias("g8")));
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void h9() __attribute__((alias("f9")));
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void f9() __attribute__((alias("g9")));
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void g9() {}
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void f10() __attribute__((alias("g10"))); // expected-error {{alias definition is part of a cycle}}
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void g10() __attribute__((alias("f10"))); // expected-error {{alias definition is part of a cycle}}
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// FIXME: This could be a bit better, h10 is not part of the cycle, it points
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// to it.
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void h10() __attribute__((alias("g10"))); // expected-error {{alias definition is part of a cycle}}
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extern int a1 __attribute__((alias("b1")));
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int b1 = 42;
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extern int a2 __attribute__((alias("b2"))); // expected-error {{alias must point to a defined variable or function}}
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extern int a3 __attribute__((alias("b3"))); // expected-error {{alias must point to a defined variable or function}}
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extern int b3;
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extern int a4 __attribute__((alias("b4"))); // expected-error {{alias must point to a defined variable or function}}
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typedef int b4;
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void test2_bar() {}
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void test2_foo() __attribute__((weak, alias("test2_bar")));
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void test2_zed() __attribute__((alias("test2_foo"))); // expected-warning {{alias will always resolve to test2_bar even if weak definition of alias test2_foo is overridden}}
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void test3_bar() { }
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void test3_foo() __attribute__((section("test"))); // expected-warning {{alias will not be in section 'test' but in the same section as the aliasee}}
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void test3_foo() __attribute__((alias("test3_bar")));
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__attribute__((section("test"))) void test4_bar() { }
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void test4_foo() __attribute__((section("test")));
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void test4_foo() __attribute__((alias("test4_bar")));
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int test5_bar = 0;
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extern struct incomplete_type test5_foo __attribute__((alias("test5_bar")));
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