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The hunk for gcc/config/arm/t-linux comes from:
http://gcc.gnu.org/PR14352
The rest is a custom job by Yuri Vasilevski.
The idea here is that we add soft float support into the spec file
so that we don't have to worry about packages stripping out softfloat
flags from CFLAGS/CXXFLAGS.
http://bugs.gentoo.org/75585
--- gcc-3.4.4/gcc/config/arm/coff.h
+++ gcc-3.4.4/gcc/config/arm/coff.h
@@ -31,11 +31,16 @@
#define TARGET_VERSION fputs (" (ARM/coff)", stderr)
#undef TARGET_DEFAULT
-#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME | ARM_FLAG_MMU_TRAPS)
+#define TARGET_DEFAULT \
+ ( ARM_FLAG_SOFT_FLOAT \
+ | ARM_FLAG_VFP \
+ | ARM_FLAG_APCS_32 \
+ | ARM_FLAG_APCS_FRAME \
+ | ARM_FLAG_MMU_TRAPS )
#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork" }
+ { "marm", "mlittle-endian", "mapcs-32", "mno-thumb-interwork" }
#endif
/* This is COFF, but prefer stabs. */
--- gcc-3.4.4/gcc/config/arm/elf.h
+++ gcc-3.4.4/gcc/config/arm/elf.h
@@ -46,7 +46,9 @@
#ifndef SUBTARGET_ASM_FLOAT_SPEC
#define SUBTARGET_ASM_FLOAT_SPEC "\
-%{mapcs-float:-mfloat} %{msoft-float:-mfpu=softfpa}"
+%{mapcs-float:-mfloat} \
+%{mhard-float:-mfpu=fpa} \
+%{!mhard-float: %{msoft-float:-mfpu=softvfp} %{!msoft-float:-mfpu=softvfp}}"
#endif
#ifndef ASM_SPEC
@@ -106,12 +108,17 @@
#endif
#ifndef TARGET_DEFAULT
-#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME | ARM_FLAG_MMU_TRAPS)
+#define TARGET_DEFAULT \
+ (ARM_FLAG_SOFT_FLOAT \
+ | ARM_FLAG_VFP \
+ | ARM_FLAG_APCS_32 \
+ | ARM_FLAG_APCS_FRAME \
+ | ARM_FLAG_MMU_TRAPS )
#endif
#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "marm", "mlittle-endian", "msoft-float", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
+ { "marm", "mlittle-endian", "mapcs-32", "mno-thumb-interwork", "fno-leading-underscore" }
#endif
#define TARGET_ASM_FILE_START_APP_OFF true
--- gcc-3.4.4/gcc/config/arm/linux-elf.h
+++ gcc-3.4.4/gcc/config/arm/linux-elf.h
@@ -44,20 +44,33 @@
#define TARGET_LINKER_EMULATION "armelf_linux"
#endif
-/* Default is to use APCS-32 mode. */
+/*
+ * Default is to use APCS-32 mode with soft-vfp.
+ * The old Linux default for floats can be achieved with -mhard-float
+ * or with the configure --with-float=hard option.
+ * If -msoft-float or --with-float=soft is used then software float
+ * support will be used just like the default but with the legacy
+ * big endian word ordering for double float representation instead.
+ */
#undef TARGET_DEFAULT
#define TARGET_DEFAULT \
( ARM_FLAG_APCS_32 | \
+ ARM_FLAG_SOFT_FLOAT | \
+ ARM_FLAG_VFP | \
ARM_FLAG_MMU_TRAPS | \
TARGET_ENDIAN_DEFAULT )
+#undef SUBTARGET_EXTRA_ASM_SPEC
+#define SUBTARGET_EXTRA_ASM_SPEC "%{mhard-float:-mfpu=fpa} \
+%{!mhard-float: %{msoft-float:-mfpu=softvfp} %{!msoft-float:-mfpu=softvfp}}"
+
#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
#define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION " -p"
#undef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "marm", TARGET_ENDIAN_OPTION, "mhard-float", "mapcs-32", "mno-thumb-interwork" }
+ { "marm", TARGET_ENDIAN_OPTION, "mapcs-32", "mno-thumb-interwork" }
#define CPP_APCS_PC_DEFAULT_SPEC "-D__APCS_32__"
@@ -72,7 +85,7 @@
%{shared:-lc} \
%{!shared:%{profile:-lc_p}%{!profile:-lc}}"
-#define LIBGCC_SPEC "%{msoft-float:-lfloat} -lgcc"
+#define LIBGCC_SPEC "-lgcc"
/* Provide a STARTFILE_SPEC appropriate for GNU/Linux. Here we add
the GNU/Linux magical crtbegin.o file (see crtstuff.c) which
--- gcc-3.4.4/gcc/config/arm/t-linux
+++ gcc-3.4.4/gcc/config/arm/t-linux
@@ -4,7 +4,10 @@
LIBGCC2_DEBUG_CFLAGS = -g0
LIB1ASMSRC = arm/lib1funcs.asm
-LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx
+LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx \
+ _negdf2 _addsubdf3 _muldivdf3 _cmpdf2 _unorddf2 _fixdfsi _fixunsdfsi \
+ _truncdfsf2 _negsf2 _addsubsf3 _muldivsf3 _cmpsf2 _unordsf2 \
+ _fixsfsi _fixunssfsi
# MULTILIB_OPTIONS = mhard-float/msoft-float
# MULTILIB_DIRNAMES = hard-float soft-float
--- gcc-3.4.4/gcc/config/arm/unknown-elf.h
+++ gcc-3.4.4/gcc/config/arm/unknown-elf.h
@@ -30,7 +30,12 @@
/* Default to using APCS-32 and software floating point. */
#ifndef TARGET_DEFAULT
-#define TARGET_DEFAULT (ARM_FLAG_SOFT_FLOAT | ARM_FLAG_APCS_32 | ARM_FLAG_APCS_FRAME | ARM_FLAG_MMU_TRAPS)
+#define TARGET_DEFAULT \
+ ( ARM_FLAG_SOFT_FLOAT \
+ | ARM_FLAG_VFP \
+ | ARM_FLAG_APCS_32 \
+ | ARM_FLAG_APCS_FRAME \
+ | ARM_FLAG_MMU_TRAPS )
#endif
/* Now we define the strings used to build the spec file. */
--- gcc-3.4.4/gcc/config/arm/xscale-elf.h
+++ gcc-3.4.4/gcc/config/arm/xscale-elf.h
@@ -51,9 +51,9 @@
#define SUBTARGET_EXTRA_ASM_SPEC "%{!mcpu=*:-mcpu=xscale} \
%{mhard-float:-mfpu=fpa} \
- %{!mhard-float: %{msoft-float:-mfpu=softfpa;:-mfpu=softvfp}}"
+ %{!mhard-float: %{msoft-float:-mfpu=softvfp} %{!msoft-float:-mfpu=softvfp}}"
#ifndef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "mlittle-endian", "mno-thumb-interwork", "marm", "msoft-float" }
+ { "mlittle-endian", "mno-thumb-interwork", "marm" }
#endif
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