Support PIE (Position Independent Executables)

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

1 files changed, 9 insertions, 0 deletions

diff --git a/src/stage1/codegen.cpp b/src/stage1/codegen.cpp
index 26fe00228e..d0bb9b4411 100644
--- a/src/stage1/codegen.cpp
+++ b/src/stage1/codegen.cpp
@@ -9043,6 +9043,7 @@ Buf *codegen_generate_builtin_source(CodeGen *g) {
     buf_appendf(contents, "pub const have_error_return_tracing = %s;\n", bool_to_str(g->have_err_ret_tracing));
     buf_appendf(contents, "pub const valgrind_support = false;\n");
     buf_appendf(contents, "pub const position_independent_code = %s;\n", bool_to_str(g->have_pic));
+    buf_appendf(contents, "pub const position_independent_executable = %s;\n", bool_to_str(g->have_pie));
     buf_appendf(contents, "pub const strip_debug_info = %s;\n", bool_to_str(g->strip_debug_symbols));
     buf_appendf(contents, "pub const code_model = CodeModel.default;\n");
 
@@ -9170,6 +9171,14 @@ static void init(CodeGen *g) {
         reloc_mode = LLVMRelocStatic;
     }
 
+    if (g->have_pic) {
+        ZigLLVMSetModulePICLevel(g->module);
+    }
+
+    if (g->have_pie) {
+        ZigLLVMSetModulePIELevel(g->module);
+    }
+
     const char *target_specific_cpu_args = "";
     const char *target_specific_features = "";