[glibc] LoongArch: ldconfig: Ignore EF_LARCH_OBJABI_V1 in shared objects

[glibc] LoongArch: ldconfig: Ignore EF_LARCH_OBJABI_V1 in shared objects

[Yinyu Cai]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=952b7630c72ae245f370f1a2bcaade82bb1f7361

commit 952b7630c72ae245f370f1a2bcaade82bb1f7361
Author: Xi Ruoyao <xry111@xry111.site>
Date:   Sun Mar 26 19:13:34 2023 +0800

    LoongArch: ldconfig: Ignore EF_LARCH_OBJABI_V1 in shared objects
    
    Binutils 2.40 sets EF_LARCH_OBJABI_V1 for shared objects:
    
        $ ld --version | head -n1
        GNU ld (GNU Binutils) 2.40
        $ echo 'int dummy;' > dummy.c
        $ cc dummy.c -shared
        $ readelf -h a.out | grep Flags
        Flags:                             0x43, DOUBLE-FLOAT, OBJ-v1
    
    We need to ignore it in ldconfig or ldconfig will consider all shared
    objects linked by Binutils 2.40 "unsupported".  Maybe we should stop
    setting EF_LARCH_OBJABI_V1 for shared objects, but Binutils 2.40 is
    already released and we cannot change it.

Diff:
---
 sysdeps/unix/sysv/linux/loongarch/readelflib.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sysdeps/unix/sysv/linux/loongarch/readelflib.c b/sysdeps/unix/sysv/linux/loongarch/readelflib.c
index bcaff86b36..ceba355959 100644
--- a/sysdeps/unix/sysv/linux/loongarch/readelflib.c
+++ b/sysdeps/unix/sysv/linux/loongarch/readelflib.c
@@ -40,7 +40,7 @@ process_elf_file (const char *file_name, const char *lib, int *flag,
 
   ret = process_elf64_file (file_name, lib, flag, isa_level, soname,
 				file_contents, file_length);
-  flags = elf64_header->e_flags;
+  flags = elf64_header->e_flags & ~EF_LARCH_OBJABI_V1;
 
   /* LoongArch linkers encode the floating point ABI as part of the ELF headers.  */
   switch (flags & SUPPORTED_ELF_FLAGS)