[Bug target/97827] bootstrap error building the amdgcn-amdhsa offload compiler with LLVM 11

[burnus at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97827

--- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Draft patch (untested):

diff --git a/gcc/varasm.c b/gcc/varasm.c
index ada99940f65..51a507393a8 100644
--- a/gcc/varasm.c
+++ b/gcc/varasm.c
@@ -6738,9 +6738,11 @@ default_elf_asm_named_section (const char *name,
unsigned int flags,
   /* If we have already declared this section, we can use an
      abbreviated form to switch back to it -- unless this section is
      part of a COMDAT groups, in which case GAS requires the full
-     declaration every time.  */
+     declaration every time.  LLVM's MC linker requires that the
+     flags are identical, thus avoid the abbreviated form with MERGE.  */
   if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
-      && (flags & SECTION_DECLARED))
+      && (flags & SECTION_DECLARED)
+      && !(flags & SECTION_MERGE))
     {
       fprintf (asm_out_file, "\t.section\t%s\n", name);
       return;