jasonmolenda added a comment.
all:
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
echo 'int bar() { return 5; }' > mylib.c
clang -dynamiclib -o libmylib.dylib mylib.c
./a.out
https://reviews.llvm.org/D40812
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