fd739804e0
For a default visibility external linkage definition, dso_local is set for ELF
-fno-pic/-fpie and COFF and Mach-O. Since default clang -cc1 for ELF is similar
to -fpic ("PIC Level" is not set), this nuance causes unneeded binary format differences.
To make emitted IR similar, ELF -cc1 -fpic will default to -fno-semantic-interposition,
which sets dso_local for default visibility external linkage definitions.
To make this flip smooth and enable future (dso_local as definition default),
this patch replaces (function) `define ` with `define{{.*}} `,
(variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `.
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
// RUN: %clang_cc1 -triple=i386-pc-solaris2.11 -w -emit-llvm %s -o - | FileCheck %s
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#pragma redefine_extname fake real
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#pragma redefine_extname name alias
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extern int fake(void);
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int name;
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// __PRAGMA_REDEFINE_EXTNAME should be defined. This will fail if it isn't...
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int fish() { return fake() + __PRAGMA_REDEFINE_EXTNAME + name; }
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// Check that the call to fake() is emitted as a call to real()
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// CHECK: call i32 @real()
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// Check that this also works with variables names
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// CHECK: load i32, i32* @alias
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// This is a case when redefenition is deferred *and* we have a local of the
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// same name. PR23923.
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#pragma redefine_extname foo bar
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int f() {
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int foo = 0;
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return foo;
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}
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extern int foo() { return 1; }
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// CHECK: define{{.*}} i32 @bar()
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// Check that pragma redefine_extname applies to external declarations only.
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#pragma redefine_extname foo_static bar_static
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static int foo_static() { return 1; }
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int baz() { return foo_static(); }
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// CHECK-NOT: call i32 @bar_static()
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// Check that pragma redefine_extname applies to builtin functions.
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typedef unsigned long size_t;
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extern void *memcpy(void *, const void *, size_t);
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#pragma redefine_extname memcpy __GI_memcpy
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void *test_memcpy(void *dst, const void *src, size_t n) { return memcpy(dst, src, n); }
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// CHECK: call i8* @__GI_memcpy(
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