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1$ cat private_extern.c2__attribute__((visibility("hidden")))3int* foo() {4 int i = 10;5 volatile int* j = &i;6 return j;7}8 9int* bar() {10 return foo();11}12 13$ cat extern.c14__attribute__((visibility("hidden")))15int* foo() {16 int i = 10;17 volatile int* j = &i;18 return j;19}20 21int* bar() {22 return foo();23}24 25$ cat main.c26int* bar();27int main() {28 return *bar();29}30 31$ cat alias_list32_foo _baz33 34$ xcrun --sdk iphoneos clang -g private_extern.c -c -o private_extern.o -target arm64-apple-ios14.035$ xcrun --sdk iphoneos clang -g main.c -c -o main.o -target arm64-apple-ios14.036$ xcrun --sdk iphoneos clang private_extern.o main.o -target arm64-apple-ios14.0 -o private_extern.out -Xlinker -alias_list -Xlinker alias_list37 38RUN: dsymutil -oso-prepend-path %p/../Inputs %p/../Inputs/private/tmp/private_extern/private_extern.out -o %t.dSYM --verbose | FileCheck %s39RUN: dsymutil -oso-prepend-path %p/../Inputs %p/../Inputs/private/tmp/extern/extern.out -o %t.dSYM --verbose | FileCheck %s40 41RUN: dsymutil --linker parallel -oso-prepend-path %p/../Inputs %p/../Inputs/private/tmp/private_extern/private_extern.out -o %t.dSYM --verbose | FileCheck %s42RUN: dsymutil --linker parallel -oso-prepend-path %p/../Inputs %p/../Inputs/private/tmp/extern/extern.out -o %t.dSYM --verbose | FileCheck %s43 44CHECK-NOT: could not find symbol '_baz'45CHECK: { sym: _baz, objAddr: 0x0, binAddr: 0x100007F58, size: 0x0 }46CHECK: { sym: _foo, objAddr: 0x0, binAddr: 0x100007F58, size: 0x20 }47