jasonmolenda added a comment.
The output looks like this:
% make
echo 'int foo() { return 5; }' > mylib.c
echo "int foo() __attribute__((weak_import)); int printf(const char *, ...);
int main() { if (foo) printf (\"have foo() %d\\\n\", foo()); else printf(\"do
not have foo\\\n\"); return 0; }" > main.c
clang -dynamiclib -o libmylib.dylib mylib.c
clang main.c -L. -lmylib
./a.out
have foo() 5
echo 'int bar() { return 5; }' > mylib.c
clang -dynamiclib -o libmylib.dylib mylib.c
./a.out
do not have foo
https://reviews.llvm.org/D40812
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