lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

3 files changed, 33 insertions, 0 deletions

diff --git a/lib/mlibc/tests/rtdl/scope5/libfoo.c b/lib/mlibc/tests/rtdl/scope5/libfoo.c
new file mode 100644
index 0000000..85e6cd8
--- /dev/null
+++ b/lib/mlibc/tests/rtdl/scope5/libfoo.c
@@ -0,0 +1 @@
+void foo() {}
diff --git a/lib/mlibc/tests/rtdl/scope5/meson.build b/lib/mlibc/tests/rtdl/scope5/meson.build
new file mode 100644
index 0000000..22ade5b
--- /dev/null
+++ b/lib/mlibc/tests/rtdl/scope5/meson.build
@@ -0,0 +1,5 @@
+libfoo = shared_library('foo', 'libfoo.c')
+test_link_with = [libfoo]
+
+libfoo_native = shared_library('native-foo', 'libfoo.c', native: true)
+test_native_link_with = [libfoo_native]
diff --git a/lib/mlibc/tests/rtdl/scope5/test.c b/lib/mlibc/tests/rtdl/scope5/test.c
new file mode 100644
index 0000000..2c11c2e
--- /dev/null
+++ b/lib/mlibc/tests/rtdl/scope5/test.c
@@ -0,0 +1,27 @@
+#include <dlfcn.h>
+#include <stdio.h>
+#include <assert.h>
+
+#ifdef USE_HOST_LIBC
+#define LIBFOO "libnative-foo.so"
+#else
+#define LIBFOO "libfoo.so"
+#endif
+
+// We need to have a relocation against foo for DT_NEEDED.
+void foo();
+void bar() { foo(); }
+
+int main() {
+	// In this test, we have exec -> foo (where '->' means 'depends on').
+	// This means that foo is in the global scope due to DT_NEEDED.
+	// We then dlopen it again with RTLD_LOCAL, which should just return
+	// the already-loaded object, but used to crash in the mlibc linker instead.
+
+	void *foo = dlopen(LIBFOO, RTLD_LOCAL | RTLD_NOW);
+	assert(foo);
+	assert(dlsym(foo, "foo"));
+	assert(dlsym(RTLD_DEFAULT, "foo"));
+
+	dlclose(foo);
+}