[PATCH 28/46] scripts, lto: re-add gcc-ld

* [PATCH 28/46] scripts, lto: re-add gcc-ld
       [not found] <20221114114344.18650-1-jirislaby@kernel.org>
@ 2022-11-14 11:43 ` Jiri Slaby (SUSE)
  2022-11-14 11:43 ` [PATCH 29/46] scripts, lto: use CONFIG_LTO for many LTO specific actions Jiri Slaby (SUSE)
                   ` (6 subsequent siblings)
  7 siblings, 0 replies; 10+ messages in thread
From: Jiri Slaby (SUSE) @ 2022-11-14 11:43 UTC (permalink / raw)
  To: linux-kernel
  Cc: Andi Kleen, Masahiro Yamada, Michal Marek, Nick Desaulniers,
	linux-kbuild, Martin Liska, Jiri Slaby

From: Andi Kleen <ak@linux.intel.com>

The primary goal of the script is to mangle linker command line arguments
into something which gcc understands. Such as converting "-z now" into
"-Wl,-z,now".

The script was removed by commit 86879fd277e8 (scripts: remove obsolete
gcc-ld script) as there was no use in the kernel. It had been added long
time ago to support exactly these lto patches, so we need to add it back
now.

Since the removed version, it is improved a bit:
* some missing linker and gcc command line arguments were added, and
* when V=1 is specified, it prints the final gcc command line

[js] rebase + commit message massage

Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michal Marek <michal.lkml@markovi.net>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: linux-kbuild@vger.kernel.org
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Martin Liska <mliska@suse.cz>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 scripts/gcc-ld | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100755 scripts/gcc-ld

diff --git a/scripts/gcc-ld b/scripts/gcc-ld
new file mode 100755
index 000000000000..13e85ece8d04
--- /dev/null
+++ b/scripts/gcc-ld
@@ -0,0 +1,40 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# run gcc with ld options
+# used as a wrapper to execute link time optimizations
+# yes virginia, this is not pretty
+
+ARGS="-nostdlib"
+
+for j in "$@" ; do
+	if [ "$j" = -v ] ; then
+		exec `$CC -print-prog-name=ld` -v
+	fi
+done
+
+while [ "$1" != "" ] ; do
+	case "$1" in
+	-save-temps*|-m32|-m64) N="$1" ;;
+	-r) N="$1" ;;
+	-flinker-output*) N="$1" ;;
+	-[Wg]*) N="$1" ;;
+	-[olv]|-[Ofd]*|-nostdlib) N="$1" ;;
+	--end-group|--start-group|--whole-archive|--no-whole-archive|\
+--no-undefined|--hash-style*|--build-id*|--eh-frame-hdr|-Bsymbolic)
+		 N="-Wl,$1" ;;
+	-[RTFGhIezcbyYu]*|\
+--script|--defsym|-init|-Map|--oformat|-rpath|\
+-rpath-link|--sort-section|--section-start|-Tbss|-Tdata|-Ttext|-soname|\
+--version-script|--dynamic-list|--version-exports-symbol|--wrap|-m|-z)
+		A="$1" ; shift ; N="-Wl,$A,$1" ;;
+	-[m]*) N="$1" ;;
+	-*) N="-Wl,$1" ;;
+	*)  N="$1" ;;
+	esac
+	ARGS="$ARGS $N"
+	shift
+done
+
+[ -n "$V" ] && echo >&2 $CC $ARGS
+
+exec $CC $ARGS
-- 
2.38.1


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