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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-4.0.2/gcc/config/arm/elf.h
+++ gcc-4.0.2/gcc/config/arm/elf.h
@@ -45,8 +45,9 @@
#endif
#ifndef SUBTARGET_ASM_FLOAT_SPEC
-#define SUBTARGET_ASM_FLOAT_SPEC "\
-%{mapcs-float:-mfloat}"
+#define SUBTARGET_ASM_FLOAT_SPEC "%{mapcs-float:-mfloat} \
+ %{mhard-float:-mfpu=fpa} \
+ %{!mhard-float: %{msoft-float:-mfpu=softfpa;:-mfpu=softvfp}}"
#endif
#ifndef ASM_SPEC
@@ -58,8 +59,6 @@
%{mapcs-*:-mapcs-%*} \
%(subtarget_asm_float_spec) \
%{mthumb-interwork:-mthumb-interwork} \
-%{msoft-float:-mfloat-abi=soft} %{mhard-float:-mfloat-abi=hard} \
-%{mfloat-abi=*} %{mfpu=*} \
%(subtarget_extra_asm_spec)"
#endif
--- gcc-4.0.2/gcc/config/arm/linux-elf.h
+++ gcc-4.0.2/gcc/config/arm/linux-elf.h
@@ -28,7 +28,7 @@
#define TARGET_VERSION fputs (" (ARM GNU/Linux with ELF)", stderr);
#undef TARGET_DEFAULT_FLOAT_ABI
-#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_HARD
+#define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
/* TARGET_BIG_ENDIAN_DEFAULT is set in
config.gcc for big endian configurations. */
@@ -44,6 +44,10 @@
#undef TARGET_DEFAULT
#define TARGET_DEFAULT (TARGET_ENDIAN_DEFAULT)
+#undef SUBTARGET_EXTRA_ASM_SPEC
+#define SUBTARGET_EXTRA_ASM_SPEC "%{mhard-float:-mfpu=fpa} \
+ %{!mhard-float: %{msoft-float:-mfpu=softfpa;:-mfpu=softvfp}}"
+
#define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm6
@@ -51,7 +55,7 @@
#undef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "marm", "mlittle-endian", "mhard-float", "mno-thumb-interwork" }
+ { "marm", TARGET_ENDIAN_OPTION, "msoft-float", "mno-thumb-interwork" }
/* Now we define the strings used to build the spec file. */
#undef LIB_SPEC
@@ -60,7 +64,7 @@
%{shared:-lc} \
%{!shared:%{profile:-lc_p}%{!profile:-lc}}"
-#define LIBGCC_SPEC "%{msoft-float:-lfloat} %{mfloat-abi=soft*:-lfloat} -lgcc"
+#define LIBGCC_SPEC "-lgcc"
#define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
--- gcc-4.0.2/gcc/config/arm/t-linux
+++ gcc-4.0.2/gcc/config/arm/t-linux
@@ -3,8 +3,10 @@
TARGET_LIBGCC2_CFLAGS = -fomit-frame-pointer -fPIC
LIB1ASMSRC = arm/lib1funcs.asm
-LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx _clzsi2 _clzdi2 \
- _arm_addsubdf3 _arm_addsubsf3
+LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx \
+ _negdf2 _addsubdf3 _muldivdf3 _cmpdf2 _unorddf2 _fixdfsi _fixunsdfsi \
+ _truncdfsf2 _negsf2 _addsubsf3 _muldivsf3 _cmpsf2 _unordsf2 \
+ _fixsfsi _fixunssfsi _floatdidf _floatdisf
# MULTILIB_OPTIONS = mhard-float/msoft-float
# MULTILIB_DIRNAMES = hard-float soft-float
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