Support PIE (Position Independent Executables)

Closes #4503
Revives #3960
Merges branch 'pie' into master

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/std/start.zig b/lib/std/start.zig
index de8d035315..6e15dad84c 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -202,6 +202,12 @@ fn posixCallMainAndExit() noreturn {
         // Find the beginning of the auxiliary vector
         const auxv = @ptrCast([*]std.elf.Auxv, @alignCast(@alignOf(usize), envp.ptr + envp_count + 1));
         std.os.linux.elf_aux_maybe = auxv;
+
+        // Do this as early as possible, the aux vector is needed
+        if (builtin.position_independent_executable) {
+            @import("os/linux/start_pie.zig").apply_relocations();
+        }
+
         // Initialize the TLS area
         std.os.linux.tls.initStaticTLS();