From: Thiemo Seufer <ths@networkno.de>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] Add gcc 4.0 support
Date: Tue, 28 Mar 2006 15:09:37 +0100 [thread overview]
Message-ID: <20060328140937.GB31939@networkno.de> (raw)
In-Reply-To: <20060215122501.GA29709@networkno.de>
On Wed, Feb 15, 2006 at 12:25:01PM +0000, Thiemo Seufer wrote:
> Hello all,
>
> the appended patch
>
> - Adds detection of gcc commandline flag support, based on the theory
> "If it exists, we want to use it".
> - Uses this to add enough gcc4 flag magic to OP_FLAGS, and remove the
> specialcasing for gcc3 as well as the bail out for gcc4.
> - Makes CFLAGS and OP_CLFAGS distinct sets because options like -O0
> are useful for debugging in CFLAGS but break qemu in OP_CFLAGS.
> - Updates the ppc.ld script to work with gcc4.
> - Adds preliminary mips/mipsel support to Makefile.target.
> - Adds to RETURN and FORCE_RET a "memory" constraint to ensure it works
> as optimisation barrier.
>
> Caveats:
> - Those changes weren't tested with earlier compilers. The linker
> script probably requires some more recent ld. Please test if it
> still works for you.
> - The -malign-functions=0 is now used as a fallback for
> -fno-align-functions on all architectures, not only on i386. This
> might be wrong.
>
>
> Tested on Debian unstable on powerpc, while working on improving the
> mips emulation support.
Updated version, note that this is still not suitable for CVS since
x86 fails to build with it.
Thiemo
Index: Makefile.target
===================================================================
--- Makefile.target.orig 2006-03-28 15:05:19.000000000 +0100
+++ Makefile.target 2006-03-28 15:05:45.000000000 +0100
@@ -17,6 +17,14 @@
VPATH+=:$(SRC_PATH)/linux-user
DEFINES+=-I$(SRC_PATH)/linux-user -I$(SRC_PATH)/linux-user/$(TARGET_ARCH)
endif
+
+# cc-option
+# Usage: CFLAGS += $(call cc-option, -falign-functions=0, -malign-functions=0)
+
+cc-option = $(shell if $(CC) $(CFLAGS) $(1) -S -o /dev/null -xc /dev/null \
+ > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
+
+
CFLAGS=-Wall -O2 -g -fno-strict-aliasing
#CFLAGS+=-Werror
LDFLAGS=-g
@@ -65,15 +73,19 @@
LDFLAGS+=-static
endif
-ifeq ($(ARCH),i386)
-CFLAGS+=-fomit-frame-pointer
-OP_CFLAGS=$(CFLAGS) -mpreferred-stack-boundary=2
-ifeq ($(HAVE_GCC3_OPTIONS),yes)
-OP_CFLAGS+= -falign-functions=0 -fno-gcse
-else
-OP_CFLAGS+= -malign-functions=0
-endif
+# We require -O2 to avoid the stack setup prologue in EXIT_TB
+OP_CFLAGS = -Wall -O2 -g -fno-strict-aliasing
+OP_CFLAGS += $(call cc-option, -fno-reorder-blocks, "")
+OP_CFLAGS += $(call cc-option, -fno-tree-ch, "")
+OP_CFLAGS += $(call cc-option, -fno-optimize-sibling-calls, "")
+OP_CFLAGS += $(call cc-option, -fno-crossjumping, "")
+OP_CFLAGS += $(call cc-option, -fno-align-labels, "")
+OP_CFLAGS += $(call cc-option, -fno-align-jumps, "")
+OP_CFLAGS += $(call cc-option, -fno-align-functions, -malign-functions=0)
+ifeq ($(ARCH),i386)
+CFLAGS += -fomit-frame-pointer
+OP_CFLAGS += -fomit-frame-pointer -preferred-stack-boundary=2
ifdef TARGET_GPROF
USE_I386_LD=y
endif
@@ -91,64 +103,61 @@
endif
ifeq ($(ARCH),x86_64)
-OP_CFLAGS=$(CFLAGS) -falign-functions=0
LDFLAGS+=-Wl,-T,$(SRC_PATH)/x86_64.ld
endif
ifeq ($(ARCH),ppc)
-CFLAGS+= -D__powerpc__
-OP_CFLAGS=$(CFLAGS)
+CFLAGS += -D__powerpc__
LDFLAGS+=-Wl,-T,$(SRC_PATH)/ppc.ld
endif
ifeq ($(ARCH),s390)
-OP_CFLAGS=$(CFLAGS)
LDFLAGS+=-Wl,-T,$(SRC_PATH)/s390.ld
endif
ifeq ($(ARCH),sparc)
-CFLAGS+=-m32 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6
-LDFLAGS+=-m32
-OP_CFLAGS=$(CFLAGS) -fno-delayed-branch -ffixed-i0
-HELPER_CFLAGS=$(CFLAGS) -ffixed-i0 -mflat
+CFLAGS += -m32 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6
+LDFLAGS += -m32
+OP_CFLAGS += -m32 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6 \
+ -fno-delayed-branch -ffixed-i0
+HELPER_CFLAGS = $(CFLAGS) -ffixed-i0 -mflat
# -static is used to avoid g1/g3 usage by the dynamic linker
LDFLAGS+=-Wl,-T,$(SRC_PATH)/sparc.ld -static
endif
ifeq ($(ARCH),sparc64)
-CFLAGS+=-m64 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6
-LDFLAGS+=-m64
-OP_CFLAGS=$(CFLAGS) -fno-delayed-branch -ffixed-i0
+CFLAGS += -m64 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6
+LDFLAGS += -m64
+OP_CFLAGS += -m64 -ffixed-g1 -ffixed-g2 -ffixed-g3 -ffixed-g6 \
+ -fno-delayed-branch -ffixed-i0
endif
ifeq ($(ARCH),alpha)
-# -msmall-data is not used because we want two-instruction relocations
-# for the constant constructions
-OP_CFLAGS=-Wall -O2 -g
# Ensure there's only a single GP
CFLAGS += -msmall-data
+# -msmall-data is not used for OP_CFLAGS because we want
+# two-instruction relocations for the constant constructions
LDFLAGS+=-Wl,-T,$(SRC_PATH)/alpha.ld
endif
ifeq ($(ARCH),ia64)
CFLAGS += -mno-sdata
-OP_CFLAGS=$(CFLAGS)
+OP_CFLAGS += -mno-sdata
LDFLAGS+=-Wl,-G0 -Wl,-T,$(SRC_PATH)/ia64.ld
endif
ifeq ($(ARCH),arm)
-OP_CFLAGS=$(CFLAGS) -mno-sched-prolog -fno-omit-frame-pointer
+OP_CFLAGS += -mno-sched-prolog -fno-omit-frame-pointer
LDFLAGS+=-Wl,-T,$(SRC_PATH)/arm.ld
endif
ifeq ($(ARCH),m68k)
-OP_CFLAGS=$(CFLAGS) -fomit-frame-pointer
-LDFLAGS+=-Wl,-T,m68k.ld
+OP_CFLAGS += -fomit-frame-pointer
+LDFLAGS+=-Wl,-T,$(SRC_PATH)/m68k.ld
endif
-ifeq ($(HAVE_GCC3_OPTIONS),yes)
-# very important to generate a return at the end of every operation
-OP_CFLAGS+=-fno-reorder-blocks -fno-optimize-sibling-calls
+ifeq ($(ARCH),mips)
+LDFLAGS+=-Wl,-T,$(SRC_PATH)/mips.ld
endif
ifeq ($(CONFIG_DARWIN),yes)
Index: configure
===================================================================
--- configure.orig 2006-03-28 15:05:19.000000000 +0100
+++ configure 2006-03-28 15:05:45.000000000 +0100
@@ -291,34 +291,6 @@
hostlongbits="64"
fi
-# check gcc options support
-cat > $TMPC <<EOF
-int main(void) {
-}
-EOF
-
-have_gcc3_options="no"
-if $cc -fno-reorder-blocks -fno-optimize-sibling-calls -o $TMPO $TMPC 2> /dev/null ; then
- have_gcc3_options="yes"
-fi
-
-# Check for gcc4
-if test "$check_gcc" = "yes" ; then
- cat > $TMPC <<EOF
-#if __GNUC__ >= 4
-#error gcc4
-#endif
-int main(){return 0;}
-EOF
- if ! $cc -o $TMPO $TMPC 2>/dev/null ; then
- echo "ERROR: \"$cc\" looks like gcc 4.x"
- echo "QEMU is known to have problems when compiled with gcc 4.x"
- echo "It is recommended that you use gcc 3.x to build QEMU"
- echo "To use this compiler anyway, configure with --disable-gcc-check"
- exit 1;
- fi
-fi
-
##########################################
# SDL probe
@@ -409,7 +381,7 @@
echo " --fmod-lib path to FMOD library"
echo " --fmod-inc path to FMOD includes"
echo ""
-echo "NOTE: The object files are build at the place where configure is launched"
+echo "NOTE: The object files are built at the place where configure is launched"
exit 1
fi
@@ -498,9 +470,6 @@
echo "#define CONFIG_QEMU_SHAREDIR \"$datadir\"" >> $config_h
echo "MAKE=$make" >> $config_mak
echo "CC=$cc" >> $config_mak
-if test "$have_gcc3_options" = "yes" ; then
- echo "HAVE_GCC3_OPTIONS=yes" >> $config_mak
-fi
echo "HOST_CC=$host_cc" >> $config_mak
echo "AR=$ar" >> $config_mak
echo "STRIP=$strip -s -R .comment -R .note" >> $config_mak
Index: dyngen-exec.h
===================================================================
--- dyngen-exec.h.orig 2006-03-28 15:05:19.000000000 +0100
+++ dyngen-exec.h 2006-03-28 15:05:45.000000000 +0100
@@ -155,7 +155,7 @@
#endif
/* force GCC to generate only one epilog at the end of the function */
-#define FORCE_RET() asm volatile ("");
+#define FORCE_RET() __asm__ __volatile__("" : : : "memory");
#ifndef OPPROTO
#define OPPROTO
Index: ppc.ld
===================================================================
--- ppc.ld.orig 2006-03-28 15:05:19.000000000 +0100
+++ ppc.ld 2006-03-28 15:05:45.000000000 +0100
@@ -2,8 +2,8 @@
* Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>;
*/
OUTPUT_FORMAT("elf32-powerpc", "elf32-powerpc", "elf32-powerpc")
-OUTPUT_ARCH(powerpc)
-SEARCH_DIR(/lib); SEARCH_DIR(/usr/lib); SEARCH_DIR(/usr/local/lib); SEARCH_DIR(/usr/alpha-unknown-linux-gnu/lib);
+OUTPUT_ARCH(powerpc:common)
+SEARCH_DIR(/usr/powerpc-linux-gnu/lib); SEARCH_DIR(/usr/local/lib); SEARCH_DIR(/lib); SEARCH_DIR(/usr/lib)
ENTRY(_start)
SECTIONS
{
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{
*(.dynbss)
- *(.bss)
+ *(.bss .bss.* .gnu.linkonce.b.*)
*(COMMON)
+ /* Align here to ensure that the .bss section occupies space up to
+ _end. Align after .bss to ensure correct alignment even if the
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@@ -137,4 +223,6 @@
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Index: target-mips/exec.h
===================================================================
--- target-mips/exec.h.orig 2006-03-28 15:05:19.000000000 +0100
+++ target-mips/exec.h 2006-03-28 15:05:45.000000000 +0100
@@ -31,9 +31,9 @@
#endif
#if defined (DEBUG_OP)
-#define RETURN() __asm__ __volatile__("nop");
+# define RETURN() __asm__ __volatile__("nop" : : : "memory");
#else
-#define RETURN() __asm__ __volatile__("");
+# define RETURN() __asm__ __volatile__("" : : : "memory");
#endif
#include "cpu.h"
Index: target-ppc/exec.h
===================================================================
--- target-ppc/exec.h.orig 2006-03-28 15:05:19.000000000 +0100
+++ target-ppc/exec.h 2006-03-28 15:05:45.000000000 +0100
@@ -38,9 +38,9 @@
#define FT2 (env->ft2)
#if defined (DEBUG_OP)
-#define RETURN() __asm__ __volatile__("nop");
+#define RETURN() __asm__ __volatile__("nop" : : : "memory");
#else
-#define RETURN() __asm__ __volatile__("");
+#define RETURN() __asm__ __volatile__("" : : : "memory");
#endif
#include "cpu.h"
Index: mips.ld
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ mips.ld 2006-03-28 15:05:45.000000000 +0100
@@ -0,0 +1,225 @@
+/* Default linker script, for normal executables */
+OUTPUT_FORMAT("elf32-tradbigmips", "elf32-tradbigmips",
+ "elf32-tradlittlemips")
+OUTPUT_ARCH(mips)
+ENTRY(__start)
+SEARCH_DIR("/usr/mips-linux-gnu/lib");
+SECTIONS
+{
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+ PROVIDE (__executable_start = 0x0400000); . = 0x0400000 + SIZEOF_HEADERS;
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+ .debug_pubnames 0 : { *(.debug_pubnames) }
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+ .debug_abbrev 0 : { *(.debug_abbrev) }
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+ .debug_frame 0 : { *(.debug_frame) }
+ .debug_str 0 : { *(.debug_str) }
+ .debug_loc 0 : { *(.debug_loc) }
+ .debug_macinfo 0 : { *(.debug_macinfo) }
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+ .debug_weaknames 0 : { *(.debug_weaknames) }
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+ .gptab.sbss : { *(.gptab.bss) *(.gptab.sbss) }
+ /DISCARD/ : { *(.note.GNU-stack) }
+}
Index: mipsel.ld
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ mipsel.ld 2006-03-28 15:05:45.000000000 +0100
@@ -0,0 +1,225 @@
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+OUTPUT_FORMAT("elf32-tradlittlemips", "elf32-tradbigmips",
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+OUTPUT_ARCH(mips)
+ENTRY(__start)
+SEARCH_DIR("/usr/mips-linux-gnu/lib");
+SECTIONS
+{
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+ .hash : { *(.hash) }
+ .dynsym : { *(.dynsym) }
+ .dynstr : { *(.dynstr) }
+ .gnu.version : { *(.gnu.version) }
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+ .rela.plt : { *(.rela.plt) }
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+ {
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+ } =0x47ff041f
+ .plt : { *(.plt) }
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+ {
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+ KEEP (*(.text.*personality*))
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+ .fini :
+ {
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+ PROVIDE (__etext = .);
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+ {
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+ .eh_frame : ONLY_IF_RO { KEEP (*(.eh_frame)) }
+ .gcc_except_table : ONLY_IF_RO { *(.gcc_except_table .gcc_except_table.*) }
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+ . = ALIGN (0x40000) - ((0x40000 - .) & (0x40000 - 1)); . = DATA_SEGMENT_ALIGN (0x40000, 0x1000);
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+ PROVIDE_HIDDEN (__preinit_array_end = .);
+ }
+ .init_array :
+ {
+ PROVIDE_HIDDEN (__init_array_start = .);
+ KEEP (*(SORT(.init_array.*)))
+ KEEP (*(.init_array))
+ PROVIDE_HIDDEN (__init_array_end = .);
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+ {
+ PROVIDE_HIDDEN (__fini_array_start = .);
+ KEEP (*(.fini_array))
+ KEEP (*(SORT(.fini_array.*)))
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+ {
+ /* gcc uses crtbegin.o to find the start of
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+ /* We don't want to include the .ctor section from
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+ KEEP (*(.ctors))
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+ KEEP (*(EXCLUDE_FILE (*crtend*.o ) .dtors))
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+ .data.rel.ro : { *(.data.rel.ro.local* .gnu.linkonce.d.rel.ro.local.*) *(.data.rel.ro* .gnu.linkonce.d.rel.ro.*) }
+ . = DATA_SEGMENT_RELRO_END (0, .);
+ .data :
+ {
+ _fdata = . ;
+ *(.data .data.* .gnu.linkonce.d.*)
+ KEEP (*(.gnu.linkonce.d.*personality*))
+ SORT(CONSTRUCTORS)
+ }
+ .data1 : { *(.data1) }
+ . = .;
+ _gp = ALIGN(16) + 0x7ff0;
+ .got : { *(.got.plt) *(.got) }
+ /* We want the small data sections together, so single-instruction offsets
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+ we can shorten the on-disk segment size. */
+ .sdata :
+ {
+ *(.sdata .sdata.* .gnu.linkonce.s.*)
+ }
+ .lit8 : { *(.lit8) }
+ .lit4 : { *(.lit4) }
+ _edata = .; PROVIDE (edata = .);
+ __bss_start = .;
+ _fbss = .;
+ .sbss :
+ {
+ *(.dynsbss)
+ *(.sbss .sbss.* .gnu.linkonce.sb.*)
+ *(.scommon)
+ }
+ .bss :
+ {
+ *(.dynbss)
+ *(.bss .bss.* .gnu.linkonce.b.*)
+ *(COMMON)
+ /* Align here to ensure that the .bss section occupies space up to
+ _end. Align after .bss to ensure correct alignment even if the
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+ pad the .data section. */
+ . = ALIGN(. != 0 ? 32 / 8 : 1);
+ }
+ . = ALIGN(32 / 8);
+ . = ALIGN(32 / 8);
+ _end = .; PROVIDE (end = .);
+ . = DATA_SEGMENT_END (.);
+ /* Stabs debugging sections. */
+ .stab 0 : { *(.stab) }
+ .stabstr 0 : { *(.stabstr) }
+ .stab.excl 0 : { *(.stab.excl) }
+ .stab.exclstr 0 : { *(.stab.exclstr) }
+ .stab.index 0 : { *(.stab.index) }
+ .stab.indexstr 0 : { *(.stab.indexstr) }
+ .comment 0 : { *(.comment) }
+ /* DWARF debug sections.
+ Symbols in the DWARF debugging sections are relative to the beginning
+ of the section so we begin them at 0. */
+ /* DWARF 1 */
+ .debug 0 : { *(.debug) }
+ .line 0 : { *(.line) }
+ /* GNU DWARF 1 extensions */
+ .debug_srcinfo 0 : { *(.debug_srcinfo) }
+ .debug_sfnames 0 : { *(.debug_sfnames) }
+ /* DWARF 1.1 and DWARF 2 */
+ .debug_aranges 0 : { *(.debug_aranges) }
+ .debug_pubnames 0 : { *(.debug_pubnames) }
+ /* DWARF 2 */
+ .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
+ .debug_abbrev 0 : { *(.debug_abbrev) }
+ .debug_line 0 : { *(.debug_line) }
+ .debug_frame 0 : { *(.debug_frame) }
+ .debug_str 0 : { *(.debug_str) }
+ .debug_loc 0 : { *(.debug_loc) }
+ .debug_macinfo 0 : { *(.debug_macinfo) }
+ /* SGI/MIPS DWARF 2 extensions */
+ .debug_weaknames 0 : { *(.debug_weaknames) }
+ .debug_funcnames 0 : { *(.debug_funcnames) }
+ .debug_typenames 0 : { *(.debug_typenames) }
+ .debug_varnames 0 : { *(.debug_varnames) }
+ .gptab.sdata : { *(.gptab.data) *(.gptab.sdata) }
+ .gptab.sbss : { *(.gptab.bss) *(.gptab.sbss) }
+ /DISCARD/ : { *(.note.GNU-stack) }
+}
next prev parent reply other threads:[~2006-03-28 14:10 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-15 12:25 [Qemu-devel] [PATCH] Add gcc 4.0 support Thiemo Seufer
2006-02-15 16:20 ` Johannes Schindelin
2006-02-15 19:10 ` Thiemo Seufer
2006-02-15 22:04 ` Johannes Schindelin
2006-03-28 14:09 ` Thiemo Seufer [this message]
2006-03-29 4:26 ` John Davidorff Pell
2006-03-29 9:59 ` Thiemo Seufer
2006-03-29 17:03 ` John Davidorff Pell
2006-03-29 19:24 ` Pascal Terjan
2006-03-29 19:37 ` sofar
2006-03-29 21:21 ` [Off Topic again] " Jim C. Brown
2006-03-29 21:03 ` [Off Topic] " Jim C. Brown
2006-03-29 19:33 ` Paul Brook
2006-03-31 23:18 ` John Davidorff Pell
2006-04-03 15:42 ` Dirk Behme
2006-04-03 15:50 ` Jim C. Brown
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