[glibc] Makefile: Order the top-level stamp files before the subdirectory fan-out

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=25c42d04c45fc5fdb1481a7f968782791b21fd3e

commit 25c42d04c45fc5fdb1481a7f968782791b21fd3e
Author: Adhemerval Zanella <[email protected]>
Date:   Thu Aug 6 14:07:59 2026 -0300

    Makefile: Order the top-level stamp files before the subdirectory fan-out
    
    The archive rules in Makerules list every stamp file as a prerequisite,
    including the top level's own, and the elf sub-make evaluates them to
    build libc_pic.a for the librtld.map link.  A sub-make can only create
    the stamp files of its own directory, so when the top-level ones do not
    exist yet it fails with:
    
      make[2]: *** No rule to make target '.../stamp.os', needed by
      '.../libc_pic.a'.  Stop.
    
    The serial recursion created them before the subdirectories through the
    prerequisite order of subdir_lib; the parallel recursion (commit
    7cac99621e96) does not.  Add them as prerequisites of the object-building
    per-subdirectory targets.
    Reviewed-by: Sam James <[email protected]>

Diff:
---
 Makefile | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Makefile b/Makefile
index b9fac6f47c..d559c42873 100644
--- a/Makefile
+++ b/Makefile
@@ -575,6 +575,14 @@ $(foreach t,$(+elf_last_subdir_targets),$(eval \
   elf/$(t): $(addsuffix /$(t),$(filter-out elf,$(subdirs)))))
 endif
 
+# The archive rules in Makerules list every stamp file as a
+# prerequisite of libc_pic.a, which the elf sub-make evaluates for the
+# librtld.map link, but a sub-make can only create its own directory's
+# stamps.  Create the top-level ones before the fan-out.
+$(foreach t,$(+elf_last_subdir_targets),$(eval \
+  $(addsuffix /$(t),$(subdirs)): \
+    $(foreach o,$(object-suffixes-for-libc),$(common-objpfx)stamp$(o))))
+
 # Pass barriers: a subdirectory 'others' build links programs against
 # the libraries, so the 'lib' pass (including the top-level libc.so
 # link) must have completed.