Add "-z nocopyreloc"

commandline.cc

@@ -305,6 +305,8 @@ void parse_nonpositional_args(std::span<std::string_view> args,
       config.z_dlopen = false;
     } else if (read_z_flag(args, "nodelete")) {
       config.z_delete = false;
+    } else if (read_z_flag(args, "nocopyreloc")) {
+      config.z_copyreloc = false;
     } else if (read_flag(args, "no-undefined")) {
       config.z_defs = true;
     } else if (read_flag(args, "fork")) {

input_sections.cc

@@ -509,6 +509,8 @@ void InputSection::scan_relocations() {
       case ERROR:
         break;
       case COPYREL:
+        if (!config.z_copyreloc)
+          break;
         sym.flags |= NEEDS_COPYREL;
         rel_types[i] = rel_type;
         return;

mold.h

@@ -89,6 +89,7 @@ struct Config {
   bool strip_all = false;
   bool strip_debug = false;
   bool trace = false;
+  bool z_copyreloc = true;
   bool z_defs = false;
   bool z_delete = true;
   bool z_dlopen = true;
@@ -1257,6 +1258,7 @@ inline std::vector<ObjectFile *> objs;
 inline std::vector<SharedFile *> dsos;
 inline std::vector<OutputChunk *> chunks;
 inline std::atomic_bool df_static_tls = false;
+inline std::atomic_bool has_textrel = false;
 inline ObjectFile *internal_obj;
 
 inline OutputEhdr *ehdr;

test/nocopyreloc.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+set -e
+cd $(dirname $0)
+echo -n "Testing $(basename -s .sh $0) ... "
+t=$(pwd)/tmp/$(basename -s .sh $0)
+mkdir -p $t
+
+cat <<EOF | cc -shared -o $t/a.so -xc -
+int foo = 3;
+int bar = 5;
+EOF
+
+cat <<EOF | cc -fno-PIC -c -o $t/b.o -xc -
+#include <stdio.h>
+
+extern int foo;
+extern int bar;
+
+int main() {
+  printf("%d %d\n", foo, bar);
+  return 0;
+}
+EOF
+
+clang -fuse-ld=`pwd`/../mold -o $t/exe $t/a.so $t/b.o
+$t/exe | grep -q '3 5'
+
+! clang -fuse-ld=`pwd`/../mold -o $t/exe $t/a.so $t/b.o \
+  -Wl,-z,nocopyreloc 2> $t/log
+
+grep -q 'recompile with -fPIE' $t/log
+
+echo OK