自己编译Android gdbserver（解决运行 gdbserver时 Segmentation

一、引言

使用Android 预装 gdbserver 调试动态库时出现，Segmentation fault错误。不得不使用现有编译链重新编译一份gdbserver。我的解决过程如下。

这里要强调一点：下面编译sysroot时sysroot的目标路径，和编译gdbserver时指定的sysroot路径，一定要是用[绝对路径]。我编译过程中，曾因未使用绝对路径浪费不少精力。

二、开发环境

Ubuntu 11.04

编译通过的Android 2.3 源码

三、解决过程

1、因已经有了Android 2.3源码，省去下载源码并编译的漫长过程。

#设置Android源码目录为环境变量：$ANDROID_SRC

simba@simba-Vostro-3400:~$ export ANDROID_SRC=/home/simba/neptune/android_2.3

2、下载gdb源码，并打补丁

simba@simba-Vostro-3400:~$ mkdir gdb_build

simba@simba-Vostro-3400:~/neptune/gdb_src$ git clone https://android.googlesource.com/toolchain/gdb.git

#坐等下载完毕，然后...

#将以下保存成.patch文件

[plain]

<span style="font-size:13px;"> diff --git a/gdb-7.1.x/gdb/gdbserver/Makefile.in b/gdb-7.1.x/gdb/gdbserver/Makefile.in
index 5bf82e2..488bfb6 100644
--- a/gdb-7.1.x/gdb/gdbserver/Makefile.in
+++ b/gdb-7.1.x/gdb/gdbserver/Makefile.in
@@ -176,13 +176,13 @@ clean-info:
gdbserver$(EXEEXT): $(OBS) ${ADD_DEPS} ${CDEPS}
rm -f gdbserver$(EXEEXT)
- ${CC-LD} $(INTERNAL_CFLAGS) $(INTERNAL_LDFLAGS) -o gdbserver$(EXEEXT) $(OBS) \
- $(GDBSERVER_LIBS) $(XM_CLIBS)
+ ${CC-LD} $(INTERNAL_CFLAGS) -o gdbserver$(EXEEXT) $(OBS) \
+ $(GDBSERVER_LIBS) $(XM_CLIBS) $(INTERNAL_LDFLAGS)
gdbreplay$(EXEEXT): $(GDBREPLAY_OBS)
rm -f gdbreplay$(EXEEXT)
- ${CC-LD} $(INTERNAL_CFLAGS) $(INTERNAL_LDFLAGS) -o gdbreplay$(EXEEXT) $(GDBREPLAY_OBS) \
- $(XM_CLIBS)
+ ${CC-LD} $(INTERNAL_CFLAGS) -o gdbreplay$(EXEEXT) $(GDBREPLAY_OBS) \
+ $(XM_CLIBS) $(INTERNAL_LDFLAGS)
# Put the proper machine-specific files first, so M-. on a machine
# specific routine gets the one for the correct machine.
diff --git a/gdb-7.1.x/gdb/gdbserver/linux-arm-low.c b/gdb-7.1.x/gdb/gdbserver/linux-arm-low.c
index 54668f8..7a78cce 100644
--- a/gdb-7.1.x/gdb/gdbserver/linux-arm-low.c
+++ b/gdb-7.1.x/gdb/gdbserver/linux-arm-low.c
@@ -43,10 +43,7 @@ void init_registers_arm_with_neon (void);
# define PTRACE_SETWMMXREGS 19
#endif
-#ifndef PTRACE_GETVFPREGS
-# define PTRACE_GETVFPREGS 27
# define PTRACE_SETVFPREGS 28
-#endif
static unsigned long arm_hwcap;</span>

#打补丁

simba@simba-Vostro-3400:~/gdb_build$ cd gdb/

simba@simba-Vostro-3400:~/gdb_build/gdb$ patch -p1 <./gdb_patch.patch

3、下载build源码

simba@simba-Vostro-3400:~/gdb_build$ git clone https://android.googlesource.com/toolchain/build.git

#坐等下载完毕，然后...

#编译 sysroot

simba@simba-Vostro-3400:~/neptune/build_src$ cd build/

simba@simba-Vostro-3400:~/gdb_build/build$ ./build-sysroot.sh $ANDROID_SRC/out/target/product/imx51_bbg/$HOME/gdb_build/sysroot

#注意此处sysroot的目标目录一定要是用绝对路径，否则sysroot不能正常生成，之后编译gdbserver时会报错。

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