debug-info-extern-call.c
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// When entry values are emitted, expect a subprogram for extern decls so that
// the dwarf generator can describe call site parameters at extern call sites.
//
// RUN: %clang -Xclang -femit-debug-entry-values -g -O2 -target x86_64-none-linux-gnu -S -emit-llvm %s -o - \
// RUN: | FileCheck %s -check-prefix=DECLS-FOR-EXTERN
// Similarly, when the debugger tuning is gdb, expect a subprogram for extern
// decls so that the dwarf generator can describe information needed for tail
// call frame reconstrution.
//
// RUN: %clang -g -O2 -target x86_64-none-linux-gnu -ggdb -S -emit-llvm %s -o - \
// RUN: | FileCheck %s -check-prefix=DECLS-FOR-EXTERN
//
// Do not emit a subprogram for extern decls when entry values are disabled and
// the tuning is not set to gdb.
//
// RUN: %clang -g -O2 -target x86_64-none-linux-gnu -gsce -S -emit-llvm %s -o - \
// RUN: | FileCheck %s -check-prefix=NO-DECLS-FOR-EXTERN
// DECLS-FOR-EXTERN: !DISubprogram(name: "fn1"
// DECLS-FOR-EXTERN-NOT: !DISubprogram(name: "memcmp"
// DECLS-FOR-EXTERN-NOT: !DISubprogram(name: "__some_reserved_name"
// NO-DECLS-FOR-EXTERN-NOT: !DISubprogram(name: "fn1"
// NO-DECLS-FOR-EXTERN-NOT: !DISubprogram(name: "memcmp"
// NO-DECLS-FOR-EXTERN-NOT: !DISubprogram(name: "__some_reserved_name"
extern int fn1(int a, int b);
extern int memcmp(const void *s1, const void *s2, unsigned long n);
extern void __some_reserved_name(void);
int fn2 (int *src, int *dst) {
int x = 4, y = 5;
int res = fn1(x, y);
int res2 = memcmp(dst, src, res);
__some_reserved_name();
return res + res2;
}