[PATCH] Always set SECTION_RELRO for or .data.rel.ro{, .local} [PR116887]

[Xi Ruoyao]

At least two ports (hppa and loongarch) need to set SECTION_RELRO for
.data.rel.ro{,.local} in section_type_flags (PR52999 and PR116887), and
I cannot see a reason not to just set it in the generic code.

With this applied we can also remove the hppa-specific
pa_section_type_flags in a future patch.

gcc/ChangeLog:

        PR target/116887
        * varasm.cc (default_section_type_flags): Always set
        SECTION_RELRO if name is .data.rel.ro{,.local}.

gcc/testsuite/ChangeLog:

        PR target/116887
        * gcc.dg/pr116887.c: New test.
---

Bootstrapped & regtested on x86_64-linux-gnu.  Ok for trunk?

 gcc/testsuite/gcc.dg/pr116887.c | 23 +++++++++++++++++++++++
 gcc/varasm.cc                   | 10 ++++------
 2 files changed, 27 insertions(+), 6 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/pr116887.c

diff --git a/gcc/testsuite/gcc.dg/pr116887.c b/gcc/testsuite/gcc.dg/pr116887.c
new file mode 100644
index 00000000000..b7255e09a18
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr116887.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+/* { dg-options "-fpic" } */
+
+struct link_map
+{
+  struct link_map *l_next;
+};
+struct rtld_global
+{
+  struct link_map *_ns_loaded;
+  char buf[4096];
+  struct link_map _dl_rtld_map;
+};
+extern struct rtld_global _rtld_global;
+static int _dlfo_main __attribute__ ((section (".data.rel.ro"), used));
+void
+_dlfo_process_initial (int ns)
+{
+  for (struct link_map *l = _rtld_global._ns_loaded; l != ((void *)0);
+       l = l->l_next)
+    if (l == &_rtld_global._dl_rtld_map)
+      asm ("");
+}
diff --git a/gcc/varasm.cc b/gcc/varasm.cc
index 4426e7ce6c6..aa450092ce5 100644
--- a/gcc/varasm.cc
+++ b/gcc/varasm.cc
@@ -6863,6 +6863,9 @@ default_section_type_flags (tree decl, const char *name, 
int reloc)
 
   if (decl && TREE_CODE (decl) == FUNCTION_DECL)
     flags = SECTION_CODE;
+  else if (strcmp (name, ".data.rel.ro") == 0
+          || strcmp (name, ".data.rel.ro.local") == 0)
+    flags = SECTION_WRITE | SECTION_RELRO;
   else if (decl)
     {
       enum section_category category
@@ -6876,12 +6879,7 @@ default_section_type_flags (tree decl, const char *name, 
int reloc)
        flags = SECTION_WRITE;
     }
   else
-    {
-      flags = SECTION_WRITE;
-      if (strcmp (name, ".data.rel.ro") == 0
-         || strcmp (name, ".data.rel.ro.local") == 0)
-       flags |= SECTION_RELRO;
-    }
+    flags = SECTION_WRITE;
 
   if (decl && DECL_P (decl) && DECL_COMDAT_GROUP (decl))
     flags |= SECTION_LINKONCE;
-- 
2.47.0