[binutils-gdb] loongarch: Don't check ABI flags if no code section

[liu & zhensong]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=83c5f3aea9a0d55be73e6d5dedd653fc32f0d6d3

commit 83c5f3aea9a0d55be73e6d5dedd653fc32f0d6d3
Author: Xi Ruoyao <xry111@mengyan1223.wang>
Date:   Fri Apr 29 01:25:20 2022 +0800

    loongarch: Don't check ABI flags if no code section
    
    Various packages (glib and gtk4 for example) produces data-only objects
    using `ld -r -b binary` or `objcopy`, with no elf header flags set.  But
    these files also have no code sections, so they should be compatible
    with all ABIs.
    
    bfd/
            * elfnn-loongarch.c (elfNN_loongarch_merge_private_bfd_data):
            Skip ABI checks if the input has no code sections.
    
    Reported-by: Wu Xiaotian <yetist@gmail.com>
    Suggested-by: Wang Xuerui <i@xen0n.name>
    Signed-off-by: Xi Ruoyao <xry111@mengyan1223.wang>

Diff:
---
 bfd/elfnn-loongarch.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/bfd/elfnn-loongarch.c b/bfd/elfnn-loongarch.c
index 3c7268c02b8..307757f5dd5 100644
--- a/bfd/elfnn-loongarch.c
+++ b/bfd/elfnn-loongarch.c
@@ -389,6 +389,27 @@ elfNN_loongarch_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
   if (!_bfd_elf_merge_object_attributes (ibfd, info))
     return false;
 
+  /* If the input BFD is not a dynamic object and it does not contain any
+     non-data sections, do not account its ABI.  For example, various
+     packages produces such data-only relocatable objects with
+     `ld -r -b binary` or `objcopy`, and these objects have zero e_flags.
+     But they are compatible with all ABIs.  */
+  if (!(ibfd->flags & DYNAMIC))
+    {
+      asection *sec;
+      bool have_code_sections = false;
+      for (sec = ibfd->sections; sec != NULL; sec = sec->next)
+	if ((bfd_section_flags (sec)
+	     & (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
+	    == (SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS))
+	  {
+	    have_code_sections = true;
+	    break;
+	  }
+      if (!have_code_sections)
+	return true;
+    }
+
   if (!elf_flags_init (obfd))
     {
       elf_flags_init (obfd) = true;