Hard-code ld.so paths for all architectures

This supports multiple ld.so files in a cleaner way.  Also
forward-port multiple libc.so.6 file handling in
wrap-find-debuginfo.sh from downstream.  This also incorporates
the “nm --format=posix“ change from #2115831 downstream.

Related: RHEL-35602

Fedora 40 commit: 4ccb7475fc

glibc.spec

@@ -230,6 +230,36 @@ Source11: parse-SUPPORTED.py
 # Include in the source RPM for reference.
 Source12: ChangeLog.old
 
+# ABI-specific program interpreter name.  Used for debuginfo
+# extraction (wrap-find-debuginfo.sh) and smoke testing ($run_ldso below).
+%ifarch %{ix86}
+%global glibc_ldso /lib/ld-linux.so.2
+%endif
+%ifarch aarch64
+%global glibc_ldso /lib/ld-linux-aarch64.so.1
+%endif
+%ifarch ppc
+%global glibc_ldso /lib/ld.so.1
+%endif
+%ifarch ppc64
+%global glibc_ldso /lib64/ld64.so.1
+%endif
+%ifarch ppc64le
+%global glibc_ldso /lib64/ld64.so.2
+%endif
+%ifarch riscv64
+%global glibc_ldso /lib/ld-linux-riscv64-lp64d.so.1
+%endif
+%ifarch s390
+%global glibc_ldso /lib/ld.so.1
+%endif
+%ifarch s390x
+%global glibc_ldso /lib/ld64.so.1
+%endif
+%ifarch x86_64 x86_64_v2 x86_64_v3 x86_64_v4
+%global glibc_ldso /lib64/ld-linux-x86-64.so.2
+%endif
+
 ######################################################################
 # Activate the wrapper script for debuginfo generation, by rewriting
 # the definition of __debug_install_post.
@@ -241,7 +271,7 @@ local original = rpm.expand("%{macrobody:__debug_install_post}")
 -- Avoid embedded newlines that confuse the macro definition.
 original = original:match("^%s*(.-)%s*$"):gsub("\\\n", "")
 rpm.define("__debug_install_post bash " .. wrapper
-  .. " " .. sysroot .. " " .. original)
+  .. " " .. sysroot .. " %{glibc_ldso} " .. original)
 }
 
 # sysroot package support.  These contain arch-specific packages, so
@@ -1361,7 +1391,7 @@ build build-%{target}-32 \
 # Default set of compiler options.
 build build-%{target} \
   CC="gcc $glibc_flags_cc $glibc_flags_cc_main" \
-  CXX="gcc $glibc_flags_cc $glibc_flags_cc_main" \
+  CXX="g++ $glibc_flags_cc $glibc_flags_cc_main" \
   CFLAGS="$glibc_flags_cflags" \
 %ifarch x86_64
   --enable-cet \
@@ -2202,19 +2232,7 @@ echo ====================PLT RELOCS LIBC.SO==============
 readelf -Wr %{glibc_sysroot}/%{_lib}/libc-*.so | sed -n -e "$PLTCMD"
 echo ====================PLT RELOCS END==================
 
-# Obtain a way to run the dynamic loader.  Avoid matching the symbolic
+run_ldso="%{glibc_sysroot}/%{glibc_ldso} --library-path %{glibc_sysroot}/%{_lib}"
-# link and then pick the first loader (although there should be only
-# one).  Use -maxdepth 2 to avoid descending into the /sys-root/
-# sub-tree.  See wrap-find-debuginfo.sh.
-%ifarch x86_64
-# Hardcode the patch to avoid picking up the 32-bit dynamic linker from
-# glibc32; both 32-bit and 64-bit dynamic linkers will be present.
-ldso_path="%{glibc_sysroot}/lib64/ld-linux-x86-64.so.2"
-%else
-ldso_path="$(find %{glibc_sysroot}/ -maxdepth 2 -regextype posix-extended \
-  -regex '.*/ld(-.*|64|)\.so\.[0-9]+$' -type f | LC_ALL=C sort | head -n1)"
-%endif
-run_ldso="$ldso_path --library-path %{glibc_sysroot}/%{_lib}"
 
 # Show the auxiliary vector as seen by the new library
 # (even if we do not perform the valgrind test).

wrap-find-debuginfo.sh

@@ -18,7 +18,13 @@ set -ex
 workdir="$(mktemp -d -t find_debuginfo.XXXXXX)"
 
 ldso_tmp="$workdir/ld.so"
-libc_tmp="$workdir/libc.so"
+libc_tmp_dir="$workdir/"
+
+# Return the path where a libc should be saved temporarily. This path is
+# based on its original path received in $1.
+libc_tmp_path() {
+    echo "$libc_tmp_dir"`dirname "$1"`"/libc.so"
+}
 
 # Prefer a separately installed debugedit over the RPM-integrated one.
 if command -v debugedit >/dev/null ; then
@@ -34,79 +40,42 @@ trap cleanup 0
 
 sysroot_path="$1"
 shift
+# Resolve symbolic link, so that the activities below only alter the
+# file it points to.
+ldso_path="$(readlink -f "$sysroot_path/$1")"
+shift
 script_path="$1"
 shift
 
-# See ldso_path setting in glibc.spec.
-ldso_path=
-for ldso_candidate in `find "$sysroot_path" -maxdepth 2 \
-  -regextype posix-extended -regex '.*/ld(-.*|64|)\.so\.[0-9]+$' -type f` ; do
-    if test -z "$ldso_path" ; then
-	ldso_path="$ldso_candidate"
-    elif [ -f "$sysroot_path/lib64/ld-linux-x86-64.so.2" ] && [ -f "$sysroot_path/lib/ld-linux.so.2" ]; then
-	# x86_64 with 32-bit libc built for glibc32 as well.  Finding
-	# multiple dynamic linkers is expected, not a bug; ensure the
-	# 64-bit one is used.
-	ldso_path="$sysroot_path/lib64/ld-linux-x86-64.so.2"
-    else
-	echo "error: multiple ld.so candidates: $ldso_path, $ldso_candidate"
-	exit 1
-    fi
-done
-
 # libc.so.6 always uses this name, so it is simpler to locate.
-libc_path=
+# This can result in multiple paths, hence the loop below.
-for libc_candidate in `find "$sysroot_path" -maxdepth 2 -name libc.so.6`; do
+libc_path=`find "$sysroot_path" -name libc.so.6`
-    if test -z "$libc_path" ; then
-	libc_path="$libc_candidate"
-    elif [ -f "$sysroot_path/lib64/ld-linux-x86-64.so.2" ] && [ -f "$sysroot_path/lib/ld-linux.so.2" ]; then
-	# x86_64 with 32-bit libc built for glibc32 as well.  The test
-	# here uses ld.so paths, not libc paths, to ensure it doesn't
-	# apply on any other architecture.
-	libc_path="$sysroot_path/lib64/libc.so.6"
-    else
-	echo "error: multiple libc.so.6 candidates: $libc_path, $libc_candidate"
-	exit 1
-    fi
-done
 
 
 # Preserve the original files.
 cp "$ldso_path" "$ldso_tmp"
-cp "$libc_path" "$libc_tmp"
+for lib in $libc_path ; do
+    libtmp=`libc_tmp_path $lib`
+    mkdir -p `dirname "$libtmp"`
+    cp "$lib" "$libtmp"
+done
 
 # Run the debuginfo extraction.
 "$script_path" "$@"
 
+for lib in $libc_path ; do
+    libtmp=`libc_tmp_path "$lib"`
     # libc.so.6: Extract the .gnu_debuglink section
     objcopy -j.gnu_debuglink --set-section-flags .gnu_debuglink=alloc \
-  -O binary "$libc_path" "$libc_tmp.debuglink"
+        -O binary "$lib" "$libtmp.debuglink"
-
     # Restore the original files.
-cp "$ldso_tmp" "$ldso_path"
+    cp "$libtmp" "$lib"
-cp "$libc_tmp" "$libc_path"
 
-# Reduce the size of notes.  Primarily for annobin.
+    # Reduce the size of libc notes.  Primarily for annobin.
-objcopy --merge-notes "$ldso_path"
+    objcopy --merge-notes "$lib"
-objcopy --merge-notes "$libc_path"
 
     # libc.so.6: Restore the .gnu_debuglink section
-objcopy --add-section .gnu_debuglink="$libc_tmp.debuglink" "$libc_path"
+    objcopy --add-section .gnu_debuglink="$libtmp.debuglink" "$lib"
-
-# ld.so does not have separated debuginfo and so the debuginfo file
-# generated by find-debuginfo is redundant.  Therefore, remove it.
-ldso_debug=
-for ldso_debug_candidate in `find "$sysroot_path" -maxdepth 2 \
-    -regextype posix-extended \
-  -regex '.*/ld(-.*|64|)\.so\.[0-9]+.*debug$' -type f` ; do
-    if test -z "$ldso_debug" ; then
-	ldso_debug="$ldso_debug_candidate"
-    else
-	echo "error: multiple ld.so debug candidates: $ldso_debug, $ldso_debug_candidate"
-	exit 1
-    fi
-done
-rm -f "$ldso_debug"
 
     # libc.so.6: Reduce to valuable symbols.  Eliminate file symbols,
     # annobin symbols, and symbols used by the glibc build to implement
@@ -122,7 +91,29 @@ strip -w \
           -K '!.annobin_*' \
           -K '!__EI_*' \
           -K '!__PRETTY_FUNCTION__*' \
-    "$libc_path"
+          "$lib"
+done
+
+# Restore the original ld.so.
+cp "$ldso_tmp" "$ldso_path"
+
+# Reduce the size of notes.  Primarily for annobin.
+objcopy --merge-notes "$ldso_path"
+
+# ld.so does not have separated debuginfo and so the debuginfo file
+# generated by find-debuginfo is redundant.  Therefore, remove it.
+ldso_debug=
+for ldso_debug_candidate in `find "$sysroot_path" -maxdepth 2 \
+    -regextype posix-extended \
+  -regex '.*/ld(-.*|64|)\.so\.[0-9]+.*debug$' -type f` ; do
+    if test -z "$ldso_debug" ; then
+	ldso_debug="$ldso_debug_candidate"
+    else
+	echo "error: multiple ld.so debug candidates: $ldso_debug, $ldso_debug_candidate"
+	exit 1
+    fi
+done
+rm -f "$ldso_debug"
 
 # ld.so: Rewrite the source file paths to match the extracted
 # locations.  First compute the arguments for invoking debugedit.
@@ -147,7 +138,7 @@ done
 debug_base_name=${last_arg:-$RPM_BUILD_ROOT}
 $debugedit -b "$debug_base_name" -d "$debug_dest_name" -n $ldso_path
 # Remove the .annobin* symbols (and only them).
-if nm --format=just-symbols "$ldso_path" \
+if nm --format=posix "$ldso_path" | cut -d' ' -f1 \
 	| grep '^\.annobin' > "$ldso_tmp.annobin-symbols"; then
     objcopy --strip-symbols="$ldso_tmp.annobin-symbols" "$ldso_path"
 fi