Fix compatibility with Linux 4.17+

The gcompat loader compiled as a static binary doesn't work on Linux
since commit a4ff8e8620d3f4, failing with the error:

```
Uhuuh, elf segment at 0000000000400000 requested but the memory is mapped already
```

This is because the binary we are the ELF interpreter for is also loaded
at 0x400000. While it's actually okay to overlap the binary, since we're
going to call `execve` again, the kernel doesn't allow the overlap
anymore. Fix that by compiling the loader as static PIE, so it can be
loaded at a different address.

Signed-off-by: Samuel Holland <samuel@sholland.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 0f18af0..6a36129 100644
--- a/Makefile
+++ b/Makefile
@@ -73,7 +73,7 @@ ${LIBGCOMPAT_NAME}: ${LIBGCOMPAT_OBJ}
 ${LIBGCOMPAT_OBJ}: ${LIBGCOMPAT_INCLUDE}
 
 ${LOADER_NAME}: ${LOADER_OBJ}
-	${CC} ${CFLAGS} ${LDFLAGS} -static -o ${LOADER_NAME} ${LOADER_OBJ}
+	${CC} ${CFLAGS} ${LDFLAGS} -static-pie -o ${LOADER_NAME} ${LOADER_OBJ}
 
 .c.o:
 	${CC} ${CPPFLAGS} ${CFLAGS} -c -D_BSD_SOURCE \