任何人都可以帮助解决我的 ARM + GCC + UCLIBC 与 crossdev 的链接问题吗？
还发布到 Gentoo 论坛:http://forums.gentoo.org/viewtopic-t-925012.html
最近，我被分配到一个项目，该项目的可执行文件是使用带有 OABI 的旧 GCC 开发的。作为引用，下面是在系统上运行良好的可执行文件的 readelf 的 header 输出:
ELF Header:
Magic: 7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: ARM
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x9464
Start of program headers: 52 (bytes into file)
Start of section headers: 540956 (bytes into file)
Flags: 0x202, has entry point, GNU EABI, software FP
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 6
Size of section headers: 40 (bytes)
Number of section headers: 35
Section header string table index: 32
我使用 crossdev 和最新的 gcc/binutils/linux-headers/etc 创建了一个交叉编译器。以及 EABI。
$ crossdev arm-softfloat-linux-uclibceabi
我很高兴地开始使用该交叉编译器用可执行文件填充我的本地文件夹，只是后来在我的硬件上尝试该可执行文件并发现我最终遇到了段错误。仅通过大量谷歌搜索，我意识到我确实需要为 uclibc 提供旧的遗留 ABI:OABI。我之前的交叉编译器是 2005 年左右的。
作为另一个引用点，我使用 eabi 的可执行文件从 readelf 生成标题，看起来有点像这样:
ELF Header:
Magic: 7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: UNIX - System V
ABI Version: 0
Type: EXEC (Executable file)
Machine: ARM
Version: 0x1
Entry point address: 0x8130
Start of program headers: 52 (bytes into file)
Start of section headers: 21284 (bytes into file)
Flags: 0x5000002, has entry point, Version5 EABI
Size of this header: 52 (bytes)
Size of program headers: 32 (bytes)
Number of program headers: 7
Size of section headers: 40 (bytes)
Number of section headers: 21
Section header string table index: 18
虽然机器是相同的，但段错误不提供在目标上执行二进制文件的方法。
经过更多谷歌搜索后，我发现可能有一种方法可以使用 eabi 编译器为遗留系统生成一些代码。当我运行这个命令时我很高兴:
$ arm-softfloat-linux-uclibceabi-gcc -mabi=apcs-gnu -static -c -o /mnt/arm_uclibc/tmp/test /mnt/arm/tmp/test.c && readelf -h /mnt/arm_uclibc/tmp/test
我最终得到:
ELF Header:
Magic: 7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
Class: ELF32
Data: 2's complement, little endian
Version: 1 (current)
OS/ABI: ARM
ABI Version: 0
Type: REL (Relocatable file)
Machine: ARM
Version: 0x1
Entry point address: 0x0
Start of program headers: 0 (bytes into file)
Start of section headers: 248 (bytes into file)
Flags: 0x600, GNU EABI, software FP, VFP
Size of this header: 52 (bytes)
Size of program headers: 0 (bytes)
Number of program headers: 0
Size of section headers: 40 (bytes)
Number of section headers: 12
Section header string table index: 9
此时，我变得焦躁不安，我决定尝试使用 -mabi=apcs-gnu 创建一个可执行文件，
arm-softfloat-linux-uclibceabi-gcc -mabi=apcs-gnu -static -o /mnt/arm_uclibc/tmp/test /mnt/arm/tmp/test.c
我收到链接器错误:
/usr/libexec/gcc/arm-softfloat-linux-uclibceabi/ld: error: Source object /tmp/ccDq2f6R.o has EABI version 0, but target /mnt/arm_uclibc/tmp/test has EABI version 5
/usr/libexec/gcc/arm-softfloat-linux-uclibceabi/ld: failed to merge target specific data of file /tmp/ccDq2f6R.o
collect2: ld returned 1 exit status
问题:这让我相信我的 EABI 不正确，而我需要 OABI。是这样吗？
我相信确实如此，于是开始通过crossdev研究uclibc:
$ crossdev arm-softfloat-linux-uclibc -P -v
我很高兴地报告说，被编译成某种对象二进制文件的文件具有正确的 elf header 。所以我想这就是我想要的。
但是在 uclibc 编译过程中它会死掉，如下所示:
make[1]: `lib/ld-uClibc.so' is up to date.
LD libuClibc-0.9.33.2.so
libc/libc_so.a(_fpmaxtostr.os): In function `_fpmaxtostr':
_fpmaxtostr.c:(.text+0xbc): undefined reference to `__nedf2'
_fpmaxtostr.c:(.text+0xe0): undefined reference to `__eqdf2'
_fpmaxtostr.c:(.text+0xfc): undefined reference to `__divdf3'
_fpmaxtostr.c:(.text+0x108): undefined reference to `__ltdf2'
_fpmaxtostr.c:(.text+0x17c): undefined reference to `__muldf3'
_fpmaxtostr.c:(.text+0x348): undefined reference to `__gedf2'
_fpmaxtostr.c:(.text+0x40c): undefined reference to `__fixunsdfsi'
libc/libc_so.a(__psfs_do_numeric.os): In function `__psfs_do_numeric':
__psfs_do_numeric.c:(.text+0x534): undefined reference to `__truncdfsf2'
libc/libc_so.a(close.oS):(.ARM.exidx+0x0): undefined reference to `__aeabi_unwind_cpp_pr0'
collect2: ld returned 1 exit status
make: *** [lib/libc.so] Error 1
如果我正确地分解了错误，我相信
1)arm Makefile.arch 未正确构建 __aeabi_unwind_cpp_pr0，因为该文件仅在设置 EABI 时构建:
$ find . -name 'Makefile.arch' -exec grep -i -H -n 'pr1' "{}" \;
./uclibc-0.9.33.2/work/uClibc-0.9.33.2/libc/sysdeps/linux/arm/Makefile.arch:45: $(ARCH_OUT)/aeabi_sighandlers.os $(ARCH_OUT)/aeabi_unwind_cpp_pr1.o
$ find . -name 'aeabi_unwind_cpp_pr1.c*'
./uclibc-0.9.33.2/work/uClibc-0.9.33.2/libc/sysdeps/linux/arm/aeabi_unwind_cpp_pr1.c
$ cat ./uclibc-0.9.33.2/work/uClibc-0.9.33.2/libc/sysdeps/linux/arm/aeabi_unwind_cpp_pr1.c
#include <stdlib.h>
attribute_hidden void __aeabi_unwind_cpp_pr0 (void);
attribute_hidden void __aeabi_unwind_cpp_pr0 (void)
{
}
attribute_hidden void __aeabi_unwind_cpp_pr1 (void);
attribute_hidden void __aeabi_unwind_cpp_pr1 (void)
{
}
attribute_hidden void __aeabi_unwind_cpp_pr2 (void);
attribute_hidden void __aeabi_unwind_cpp_pr2 (void)
{
}
我认为解决此错误的方法是:
--- Makefile.arch.old 2012-05-28 00:43:52.918708833 -0500
+++ Makefile.arch.new 2012-05-28 00:44:30.658708443 -0500
@@ -42,5 +42,6 @@
libc-static-y += $(ARCH_OUT)/aeabi_lcsts.o $(ARCH_OUT)/aeabi_math.o \
$(ARCH_OUT)/aeabi_sighandlers.o
libc-nonshared-y += $(ARCH_OUT)/aeabi_lcsts.os $(ARCH_OUT)/aeabi_math.os \
- $(ARCH_OUT)/aeabi_sighandlers.os $(ARCH_OUT)/aeabi_unwind_cpp_pr1.o
+ $(ARCH_OUT)/aeabi_sighandlers.os
endif
+libc-nonshared-y += $(ARCH_OUT)/aeabi_unwind_cpp_pr1.o
2) gcc 中的软浮点也没有被链接器正确包含。我现在还无法说出原因。
$ find . -name '*.c' -exec grep -i -H -n nedf2 "{}" \;
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/mips/mips.c:11123: set_optab_libfunc (ne_optab, DFmode, "__mips16_nedf2");
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/eqdf2.c:51:strong_alias(__eqdf2, __nedf2);
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/testsuite/gcc.c-torture/execute/gofast.c:32:int nedf2 (double a, double b) { return a != b; }
./gcc-4.5.3-r2/work/gcc-4.5.3/libgcc/config/rx/rx-abi-functions.c:41:int _COM_CMPNEd (double a, double b) { return __nedf2 (a, b) != 0; }
$ ls ./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/
README double.h extendsftf2.c fixsfti.c fixunssfdi.c floatdisf.c floattitf.c floatuntidf.c lesf2.c negtf2.c single.h trunctfdf2.c
adddf3.c eqdf2.c extendxftf2.c fixtfdi.c fixunssfsi.c floatditf.c floatundidf.c floatuntisf.c letf2.c op-1.h soft-fp.h trunctfsf2.c
addsf3.c eqsf2.c fixdfdi.c fixtfsi.c fixunssfti.c floatsidf.c floatundisf.c floatuntitf.c muldf3.c op-2.h subdf3.c trunctfxf2.c
addtf3.c eqtf2.c fixdfsi.c fixtfti.c fixunstfdi.c floatsisf.c floatunditf.c gedf2.c mulsf3.c op-4.h subsf3.c unorddf2.c
divdf3.c extenddftf2.c fixdfti.c fixunsdfdi.c fixunstfsi.c floatsitf.c floatunsidf.c gesf2.c multf3.c op-8.h subtf3.c unordsf2.c
divsf3.c extended.h fixsfdi.c fixunsdfsi.c fixunstfti.c floattidf.c floatunsisf.c getf2.c negdf2.c op-common.h t-softfp unordtf2.c
divtf3.c extendsfdf2.c fixsfsi.c fixunsdfti.c floatdidf.c floattisf.c floatunsitf.c ledf2.c negsf2.c quad.h truncdfsf2.c
$ grep -i -H -n nedf2 ./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/*
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/eqdf2.c:51:strong_alias(__eqdf2, __nedf2);
$ grep -i -H -n eqdf2 ./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/*
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/eqdf2.c:35:CMPtype __eqdf2(DFtype a, DFtype b)
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/eqdf2.c:51:strong_alias(__eqdf2, __nedf2);
$ grep -i -H -n divdf3 ./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/*
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/divdf3.c:35:DFtype __divdf3(DFtype a, DFtype b)
$ grep -i -H -n ltdf2 ./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/*
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/ledf2.c:51:strong_alias(__ledf2, __ltdf2);
$ grep -i -H -n muldf3 ./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/*
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/muldf3.c:35:DFtype __muldf3(DFtype a, DFtype b)
$ grep -i -H -n gedf2 ./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/*
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/gedf2.c:35:CMPtype __gedf2(DFtype a, DFtype b)
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/gedf2.c:51:strong_alias(__gedf2, __gtdf2);
$ grep -i -H -n fixunsdfsi ./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/*
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/fixunsdfsi.c:35:USItype __fixunsdfsi(DFtype a)
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/t-softfp:71:softfp_func_list := $(filter-out floatdidf floatdisf fixunsdfsi fixunssfsi \
$ grep -i -H -n truncdfsf2 ./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/*
./gcc-4.5.3-r2/work/gcc-4.5.3/gcc/config/soft-fp/truncdfsf2.c:36:SFtype __truncdfsf2(DFtype a)
因此，我尝试强制 GCC 构建软 float ，并稍后在 uclibc 的构建中链接该链接:
$ UCLIBC_CPU=ARM926T ACCEPT_KEYWORDS="arm" CPU_CFLAGS="-marm -march=armv5te -mtune=arm926ej-s -mabi=apcs-gnu -mno-thumb" EXTRA_FLAGS="-msoft-float -mfloat-abi=soft" UCLIBC_EXTRA_CFLAGS="${CPU_CFLAGS} ${EXTRA_CFLAGS}" STAGE1_CFLAGS="${EXTRA_CFLAGS}" CFLAGS="${EXTRA_CFLAGS}" crossdev -A arm -t arm-softfloat-linux-uclibc -P -v
然后我检查了是否在任何日志中使用了 -msoft-float 和 -mfloat-abi=soft 进行编译。
$ find . -name '*.log' -exec grep -i -H -n msoft-float "{}" \;
<nothing>
$ find . -name '*.log'
./work/build/arm-softfloat-linux-uclibc/libgcc/config.log
./work/build/libcpp/config.log
./work/build/gcc/config.log
./work/build/fixincludes/config.log
./work/build/intl/config.log
./work/build/build-x86_64-pc-linux-gnu/libiberty/config.log
./work/build/build-x86_64-pc-linux-gnu/fixincludes/config.log
./work/build/libdecnumber/config.log
./work/build/libiberty/config.log
./work/build/config.log
./work/gcc-4.5.3/contrib/reghunt/examples/29478.log
./work/gcc-4.5.3/contrib/reghunt/examples/29906a.log
./work/gcc-4.5.3/contrib/reghunt/examples/29906b.log
./work/gcc-4.5.3/contrib/reghunt/examples/28970.log
./work/gcc-4.5.3/contrib/reghunt/examples/29106.log
./work/gcc-4.5.3/contrib/reghunt/examples/30643.log
./temp/elibtool.log
./temp/epatch_user.log
./temp/epatch.log
./temp/eclass-debug.log
./temp/build.log
但我确实注意到 --with-float=soft 是在 config.log 中设置的，所以这让我相信应该已经生成了 float 。
我注意到 gcc 编译选项中的 -D__GCC_FLOAT_NOT_NEEDED。
我对 GCC 进行了回归，以查看中断发生的位置。
- gcc 4.x 不适用于 uclibc。 -- 从 4.4.4-r2 开始，uclibc 与 gcc 的链接失败 -- 在 4.4.4 之前，gcc 似乎不支持
- 只要使用 USE=-nptl，gcc-3.4.6-r2 就可以工作
作为引用，我跑了: binutils:2.22-r1 Linux 头文件:3.3、3.4 ulibc:0.9.33.2 海湾合作委员会:3.2.3-r4、3.3.6-r1、3.4.6-r2、4.1.4-r1、4.3.3-r2、4.4.2、4.4.4-r2、4.4.5、4.4.6- r1、4.4.7、4.5.3-r2、4.6.0、4.6.1-r1、4.6.2、4.6.3
最佳答案
我最终转向了 gcc-4.7.0。最终的构建是:
- binutils-2.22-r1
- gcc-4.7.0
- linux-headers-3.4
- uclibc-0.9.33.2
我的工作 crossdev arm-softfloat-linux-uclibc 编译器命令如下所示:
#!/usr/bin/env sh
CHOST=${CHOST-arm-softfloat-linux-uclibc}
USE="-nptl" \
crossdev -t ${CHOST} \
-A arm -P "--digest" \
--g 4.7.0 --genv 'EXTRA_ECONF="--enable-obsolete --with-cpu=arm926ej-s \
--without-system-libunwind --with-mode=arm \
--with-abi=apcs-gnu --with-float-abi=soft"' \
--lenv 'UCLIBC_CPU="ARM926T" \
UCLIBC_EXTRA_CFLAGS="-marm -mcpu=arm926ej-s"'
上述选项可能并不全部需要，但需要注意的是，gcc 的下一个主要版本将废弃 uclibc 的 OABI，除非他们最终找到愿意保持更新的开发人员。至少两年内没有出现过一次。
此外，我没有使用 gcc 启用 nptl。我认为可以在不启用 nptl 的情况下执行 crossdev 构建阶段 3，然后使用 nptl 执行最终的 gcc，但我还没有对二进制文件进行任何测试来证明这实际上插入了 nptl。
不幸的是，gcc 和 uclibc 开箱即用时不能很好地协同工作。我还意识到我需要一些补丁来修复我发现的错误。
为了让我自己更容易做到这一点，我最终还创建了一个补丁文件夹，这样我就不必使用 ebuilds 创建一个全新的覆盖层。在执行emerge 的过程中，这让我可以动态添加补丁。在大多数情况下，这适用于大多数软件包。我仍在使用 Python 来使其顺利编译。
创建补丁文件夹:
$ mkdir /etc/portage/patches
更新 portage bashrc:
File: /etc/portage/bashrc
#!/usr/bin/env sh
[[ $(basename $(readlink -f $PORTAGE_CONFIGROOT/etc/make.profile)) == "embedded" ]] && . ${PORTDIR}/profiles/base/profile.bashrc
post_src_install() {
[[ -d ${D} ]] || return 0
[[ ${E_MACHINE} == "" ]] && return 0
cmdline=""
for EM in $E_MACHINE; do
cmdline+=" -e ^${EM}[[:space:]]";
done
output="$( cd ${D} && scanelf -RmyBF%a . | grep -v ${cmdline} )"
[[ $output != "" ]] && { echo; echo "* Wrong EM_TYPE. Expected ${E_MACHINE}"; echo -e "${output}"; echo; exit 1; }
}
# We don't run this on the assumption that when you're
# emerging binary packages, it's into a runtime ROOT
# rather than build development ROOT. The former doesn't
# want hacking while the latter does.
if [[ $EBUILD_PHASE == "postinst" ]]; then
[[ $SYSROOT == $ROOT ]] && cross-fix-root ${CHOST}
fi
eecho() {
#[ "$NOCOLOR" = "false" ] && echo -ne '\e[1;34m>\e[1;36m>\e[1;35m>\e[0m ' || echo -n ">>> "
echo -ne '\e[1;34m>\e[1;36m>\e[1;35m>\e[0m ' || echo -n ">>> "
echo "$*"
}
run_autopatch () {
#echo ">>> --------------------------------------------------------------------"
#echo ">>>"
#echo ">>> Phase: $EBUILD_PHASE"
#echo ">>>"
#echo ">>> --------------------------------------------------------------------"
patchit="no"
if [[ $EBUILD_PHASE == prepare ]]; then
patchit="yes"
elif [[ $EBUILD_PHASE == configure ]]; then
patchit="yes"
elif [[ $EBUILD_PHASE == compile ]]; then
patchit="yes"
fi
if [[ $patchit != "no" ]]; then
# echo ">>> Patching"
[[ ! -d "$PATCH_OVERLAY" ]] && echo "PATCH_OVERLAY is not a directory: $PATCH_OVERLAY" && return 0;
[[ ! -r ${ROOT}etc/portage/bashrc.autopatch ]] && echo "Couldn't read autopatch script: ${ROOT}/etc/portage/bashrc.autopatch" && return 0;
source ${ROOT}etc/portage/bashrc.autopatch
fi
}
if [[ " ${FEATURES} " == *" autopatch "* ]] || [[ $AUTOPATCH="yes" ]]; then
run_autopatch
fi
还需要创建bashrc.autopatch。
File: /etc/portage/bashrc.autopatch
#!/usr/bin/env sh
# <solar@gentoo> 2005
# Distributed under the terms of the GNU General Public License v2
# $Header: $
# updated by brian bruggeman
autopatch() {
local diff level p patches patched
[[ ! -d "$PATCH_OVERLAY" ]] && return 0
patches=$(ls -1 ${PATCH_OVERLAY}/${CATEGORY}/${PN}/${PN}-*.{patch,diff} 2>/dev/null)
[[ $patches == "" ]] && echo "No patches found: ${PATCH_OVERLAY}/${CATEGORY}/${PN}/${PN}-*.patch" && return 0
if [[ -d $S ]] && [[ -e $S ]]; then
cd $S
else
echo ">>> Couldn't cd to $S"
fi
echo -e ' \e[0;36m*\e[0m '"Applying Autopatches from $PATCH_OVERLAY ..."
for p in ${patches}; do
p=$(basename $p)
diff=${PATCH_OVERLAY}/${CATEGORY}/${PN}/${p}
if [[ -e $diff ]] && [ ! -e ${S}/.${p} ]; then
patched=0
for level in 0 1 2 3 4; do
if [[ $patched == 0 ]]; then
patch -g0 --dry -p${level} >/dev/null < $diff
if [ $? = 0 ]; then
echo -e ' \e[0;36m*\e[0m '" (-p${level}) ${p}"
patch -g0 -p${level} < $diff > /dev/null && patched=1
touch $S/.${p}
fi
fi
done
[[ $patched != 1 ]] && echo "!!! FAILED auto patching $p"
else
[[ ! -e $diff ]] && echo "!!! $diff does not exist, unable to auto patch"
fi
done
echo -e ' \e[0;36m*\e[0m '"Done with patching auto patches ..."
cd $OLDPWD
}
PATH=$PATH:/usr/sbin:/usr/bin:/bin:/sbin
autopatch
为 gcc 创建补丁:
$ cd /etc/portage/packages
$ mkdir -p cross-arm-softfloat-linux-uclibc/gcc-4.7.0
$ cd cross-arm-softfloat-linux-uclibc/gcc-4.7.0
$ touch gcc-4.7.0-softfloat.patch
File: /etc/portage/packages/cross-arm-softfloat-linux-uclibc/gcc-4.7.0/gcc-4.7.0-softfloat.patch
Index: gcc/config/arm/linux-elf.h
===================================================================
--- gcc/config/arm/linux-elf.h 2011-04-11 13:46:05.000000000 -0500
+++ gcc/config/arm/linux-elf.h.new 2012-05-31 14:24:14.465545128 -0500
@@ -48,7 +48,7 @@
#undef MULTILIB_DEFAULTS
#define MULTILIB_DEFAULTS \
- { "marm", "mlittle-endian", "mfloat-abi=hard", "mno-thumb-interwork" }
+ { "marm", "mlittle-endian", "mfloat-abi=soft", "mno-thumb-interwork" }
/* Now we define the strings used to build the spec file. */
#undef LIB_SPEC
@@ -57,7 +57,7 @@
%{shared:-lc} \
%{!shared:%{profile:-lc_p}%{!profile:-lc}}"
-#define LIBGCC_SPEC "%{mfloat-abi=soft*:-lfloat} -lgcc"
+#define LIBGCC_SPEC "-lgcc"
#define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
Index: libgcc/config/arm/t-linux
===================================================================
--- ./libgcc/config/arm/t-linux 2011-11-02 10:23:48.000000000 -0500
+++ ./libgcc/config/arm/t-linux.new 2012-05-31 14:29:57.715541608 -0500
@@ -1,6 +1,10 @@
LIB1ASMSRC = arm/lib1funcs.S
LIB1ASMFUNCS = _udivsi3 _divsi3 _umodsi3 _modsi3 _dvmd_lnx _clzsi2 _clzdi2 \
- _arm_addsubdf3 _arm_addsubsf3
+ _arm_addsubdf3 _arm_addsubsf3 \
+ _arm_negdf2 _arm_muldivdf3 _arm_cmpdf2 _arm_unorddf2 \
+ _arm_fixdfsi _arm_fixunsdfsi _arm_truncdfsf2 \
+ _arm_negsf2 _arm_muldivsf3 _arm_cmpsf2 _arm_unordsf2 \
+ _arm_fixsfsi _arm_fixunssfsi
# Just for these, we omit the frame pointer since it makes such a big
# difference.
为 uclibc 创建补丁:
$ cd /etc/portage/packages
$ mkdir -p cross-arm-softfloat-linux-uclibc/uclibc
$ cd cross-arm-softfloat-linux-uclibc/uclibc
$ touch uclibc-0.9.33.2-unwind-fixes.patch
File: /etc/portage/packages/cross-arm-softfloat-linux-uclibc/uclibc/uclibc-0.9.33.2-unwind-fixes.patch
Index: libc/sysdeps/linux/arm/Makefile.arch
===================================================================
--- ./libc/sysdeps/linux/arm/Makefile.arch 2012-05-15 02:20:09.000000000 -0500
+++ ./libc/sysdeps/linux/arm/Makefile.arch.new 2012-05-31 00:43:11.176050458 -0500
@@ -42,5 +42,6 @@
libc-static-y += $(ARCH_OUT)/aeabi_lcsts.o $(ARCH_OUT)/aeabi_math.o \
$(ARCH_OUT)/aeabi_sighandlers.o
libc-nonshared-y += $(ARCH_OUT)/aeabi_lcsts.os $(ARCH_OUT)/aeabi_math.os \
- $(ARCH_OUT)/aeabi_sighandlers.os $(ARCH_OUT)/aeabi_unwind_cpp_pr1.o
+ $(ARCH_OUT)/aeabi_sighandlers.os
endif
+libc-nonshared-y += $(ARCH_OUT)/aeabi_unwind_cpp_pr1.o
Index: libc/sysdeps/linux/arm/unwind.h
===================================================================
--- ./libc/sysdeps/linux/arm/unwind.h 2012-05-31 00:57:39.356041552 -0500
+++ ./libc/sysdeps/linux/arm/unwind.h.new 2012-05-31 01:04:55.436037080 -0500
@@ -34,6 +34,8 @@
#define __ARM_EABI_UNWINDER__ 1
+#include <stdlib.h>
+
#ifdef __cplusplus
extern "C" {
#endif
@@ -211,7 +213,7 @@
_Unwind_Control_Block *, struct _Unwind_Context *, void *);
_Unwind_Reason_Code _Unwind_ForcedUnwind (_Unwind_Control_Block *,
_Unwind_Stop_Fn, void *);
- _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
+ extern _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
void _Unwind_Complete(_Unwind_Control_Block *ucbp);
void _Unwind_DeleteException (_Unwind_Exception *);
关于gcc - ARM gentoo crossdev 与 uclibc : need OABI rather than EABI，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10780648/