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From ef327a7c2a36b63e8a372bef88e3700460b51c34 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Sat, 11 Feb 2023 23:07:08 -0800
Subject: [PATCH] gcc: Allow g++ to work differently from gcc
Compile gcc.cc with -DIN_GPP defined when building g++ so that the
code can respond appropriately for the default target language. This
allows the driver to customize the specs used, selecting different
linker scripts, adjusting the use of crtbegin.o/crtend.o etc.
By default, this change has no effect; targets need to explicitly
check for IN_GPP to have alternate behavior.
Signed-off-by: Keith Packard <keithp@keithp.com>
---
gcc/cp/Make-lang.in | 7 ++++++-
gcc/gpp.cc | 21 +++++++++++++++++++++
2 files changed, 27 insertions(+), 1 deletion(-)
create mode 100644 gcc/gpp.cc
--- a/gcc/cp/Make-lang.in
+++ b/gcc/cp/Make-lang.in
@@ -77,7 +77,12 @@
endif
# Create the compiler driver for g++.
-GXX_OBJS = $(GCC_OBJS) cp/g++spec.o
+GXX_OBJS = $(GCC_OBJS:gcc.o=gpp.o) cp/g++spec.o
+
+CFLAGS-gpp.o = $(CFLAGS-gcc.o)
+gpp.o: $(BASEVER)
+gpp.o: gcc.o
+
xg++$(exeext): $(GXX_OBJS) $(EXTRA_GCC_OBJS) libcommon-target.a $(LIBDEPS)
+$(LINKER) $(ALL_LINKERFLAGS) $(LDFLAGS) -o $@ \
$(GXX_OBJS) $(EXTRA_GCC_OBJS) libcommon-target.a \
--- /dev/null
+++ b/gcc/gpp.cc
@@ -0,0 +1,21 @@
+/* Compiler driver program that can handle many languages.
+ Copyright (C) 1987-2022 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#define IN_GPP
+#include "gcc.cc"
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