[PATCH 44/59] Supress unused command arguments warning with clang

[Adhemerval Zanella]

clang 20 triggers an error for the unused '-c' argument used to create
errlist-data-aux-shared.S, errlist-data-aux.S, siglist-aux-shared.S,
and siglist-aux.S.
---
 configure             | 26 ++++++++++++++++++++++++++
 configure.ac          |  9 +++++++++
 stdio-common/Makefile | 16 ++++++++++++----
 3 files changed, 47 insertions(+), 4 deletions(-)

diff --git a/configure b/configure
index 789f68da75..38e7d820c5 100755
--- a/configure
+++ b/configure
@@ -7639,6 +7639,32 @@ printf "%s\n" "$libc_cv_wno_maybe_uninitialized" >&6; }
 config_vars="$config_vars
 config-cflags-wno-maybe-uninitialized = $libc_cv_wno_maybe_uninitialized"
 
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -Wno-unused-command-line-argument" >&5
+printf %s "checking for -Wno-unused-command-line-argument... " >&6; }
+if test ${libc_cv_wno_unused_command_line_argument+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e) 		if { ac_try='${CC-cc} -Werror -Wunused-command-line-argument -xc /dev/null -S -o /dev/null'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+then :
+  libc_cv_wno_unused_command_line_argument=-Wno-unused-command-line-argument
+else case e in #(
+  e) libc_cv_wno_unused_command_line_argument= ;;
+esac
+fi
+ ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_wno_unused_command_line_argument" >&5
+printf "%s\n" "$libc_cv_wno_unused_command_line_argument" >&6; }
+config_vars="$config_vars
+config-cflags-wno-unused-command-line-arguments = $libc_cv_wno_unused_command_line_argument"
+
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether cc puts quotes around section names" >&5
 printf %s "checking whether cc puts quotes around section names... " >&6; }
 if test ${libc_cv_have_section_quotes+y}
diff --git a/configure.ac b/configure.ac
index aa4641edae..0a6badeb19 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1453,6 +1453,15 @@ AC_CACHE_CHECK([for -Wno-maybe-uninitialized],
 LIBC_CONFIG_VAR([config-cflags-wno-maybe-uninitialized],
 		[$libc_cv_wno_maybe_uninitialized])
 
+AC_CACHE_CHECK([for -Wno-unused-command-line-argument],
+                libc_cv_wno_unused_command_line_argument, [dnl
+		LIBC_TRY_CC_OPTION([-Werror -Wunused-command-line-argument],
+				   [libc_cv_wno_unused_command_line_argument=-Wno-unused-command-line-argument],
+				   [libc_cv_wno_unused_command_line_argument=])
+])
+LIBC_CONFIG_VAR([config-cflags-wno-unused-command-line-arguments],
+		[$libc_cv_wno_unused_command_line_argument])
+
 AC_CACHE_CHECK(whether cc puts quotes around section names,
 	       libc_cv_have_section_quotes,
 	       [cat > conftest.c <<EOF
diff --git a/stdio-common/Makefile b/stdio-common/Makefile
index 8da164695f..fba6bd99fd 100644
--- a/stdio-common/Makefile
+++ b/stdio-common/Makefile
@@ -497,11 +497,15 @@ include ../Rules
 # than 2.29 it might generate object sizes different than the expected ones.
 $(objpfx)errlist-data-aux-shared.S: errlist-data-gen.c
 	$(make-target-directory)
-	$(compile-command.c) $(pic-cppflags) $(pic-ccflag) $(no-stack-protector) -S
+	$(compile-command.c) \
+		$(config-cflags-wno-unused-command-line-arguments) \
+		$(pic-cppflags) $(pic-ccflag) $(no-stack-protector) -S
 
 $(objpfx)errlist-data-aux.S: errlist-data-gen.c
 	$(make-target-directory)
-	$(compile-command.c) $(pie-default) $(no-stack-protector) -S
+	$(compile-command.c) \
+		$(config-cflags-wno-unused-command-line-arguments) \
+		$(pie-default) $(no-stack-protector) -S
 
 ifndef no_deps
 -include $(objpfx)errlist-data-aux.S.d $(objpfx)errlist-data-aux-shared.S.d
@@ -513,11 +517,15 @@ $(addprefix $(objpfx)errlist-data, $(object-suffixes-noshared)): \
 
 $(objpfx)siglist-aux-shared.S: siglist-gen.c
 	$(make-target-directory)
-	$(compile-command.c) $(pic-cppflags) $(pic-ccflag) $(no-stack-protector) -S
+	$(compile-command.c) \
+		$(config-cflags-wno-unused-command-line-arguments) \
+		$(pic-cppflags) $(pic-ccflag) $(no-stack-protector) -S
 
 $(objpfx)siglist-aux.S: siglist-gen.c
 	$(make-target-directory)
-	$(compile-command.c) $(pie-default) $(no-stack-protector) -S
+	$(compile-command.c) \
+		$(config-cflags-wno-unused-command-line-arguments) \
+		$(pie-default) $(no-stack-protector) -S
 
 ifndef no_deps
 -include $(objpfx)siglist-aux.S.d $(objpfx)siglist-aux-shared.S.d
-- 
2.43.0