接上文，修改Makefile和config.mk中，.depend相关文件格式后继续编译。
四、tools文件夹的文件编译错误
错误告警如下【多行信息，请使用右侧滚动条查看】：
gcc -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -idirafter /u-boot-2010.09/u-boot-2010.09/include
-idirafter /u-boot-2010.09/u-boot-2010.09/include2 -idirafter /u-boot-2010.09/u-boot-2010.09/include
-I /u-boot-2010.09/u-boot-2010.09/lib/libfdt -I /u-boot-2010.09/u-boot-2010.09/tools
-DTEXT_BASE=0x11080000 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -ansi -o default_image.o default_image.c -c
In file included from fdt_host.h::,
from mkimage.h:,
from default_image.c::
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘struct’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
../include/libfdt.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
In file included from default_image.c:::
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint8_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint8_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint8_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint8_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘char’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘ulong’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘uint32_t’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘ulong’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘void’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘int’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘ulong’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘ulong’
/u-boot-2010.09/u-boot-2010.09/include/image.h::: 错误：expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘const’
default_image.c: 在函数‘image_set_header’中:
default_image.c::: 警告：隐式声明函数‘image_set_magic’
default_image.c::: 警告：隐式声明函数‘image_set_time’
default_image.c::: 警告：隐式声明函数‘image_set_size’
default_image.c::: 警告：隐式声明函数‘image_set_load’
default_image.c::: 警告：隐式声明函数‘image_set_ep’
default_image.c::: 警告：隐式声明函数‘image_set_dcrc’
default_image.c::: 警告：隐式声明函数‘image_set_os’
default_image.c::: 警告：隐式声明函数‘image_set_arch’
default_image.c::: 警告：隐式声明函数‘image_set_type’
default_image.c::: 警告：隐式声明函数‘image_set_comp’
default_image.c::: 警告：隐式声明函数‘image_set_name’
default_image.c::: 警告：隐式声明函数‘image_set_hcrc’
/u-boot-2010.09/u-boot-2010.09/rules.mk:: recipe for target `default_image.o' failed
make[]: *** [default_image.o] Error
make[]: 离开目录“/u-boot-2010.09/u-boot-2010.09/tools”
Makefile:: recipe for target `tools' failed
make: *** [tools] Error
1、首先，需要了解gcc的错误告警信息。
1）错误位置：文件名：行号：列号。【注意：gcc工具的告警信息不是很友好，显示的错误位置可能不是真实的位置】
2）引用关系：错误提示中，第2～4行，表示头文件的引用关系（一层一层的引用）。
default_image.c 第30行 -- mkimage.h 第35行 -- fdt_host.h第25行-- libfdt.h
3）主要的错误类型： 错误：expected '=', ',', ';', 'asm' or '__attribute__' before
初步搜索，发现该问题和 头文件中 inline 关键字相关。
GCC implements three different semantics of declaring a function inline. One is available with ‘-std=gnu89’ or ‘-fgnu89-inline’ or when gnu_inline attribute is present on all inline declarations, another when ‘-std=c99’ or ‘-std=gnu99’ (without ‘-fgnu89-inline’), and the third is used when compiling C++.
To declare a function inline, use the inline keyword in its declaration, like this:
static inline int inc (int *a)
{
(*a)++;
}
If you are writing a header file to be included in ISO C89 programs, write __inline__ instead of inline
2、从错误信息可以看到，gcc包含了参数 -ansi。
而 -ansi，对于gcc工具就等于 -std=c89。
在libfdt.h文件中，第162行如下
static inline void *fdt_offset_ptr_w(void *fdt, int offset, int checklen)
告警信息为第15列，void是错误的信息，gcc认为缺少 ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’
3、找到-ansi的位置并修改。
U-boot 编译工具相关的配置，都在主文件夹 config.mk文件中，
ifeq ($(HOSTOS),cygwin)
HOSTCFLAGS += -ansi
endif
从配置中可以，u-boot认为在cygwin下，需要增加-ansi的编译选型。
但实际，由于u-boot-2010.09文件是根据C99规范编写的，应该删除该信息。
4、gcc工具编译错误的问题得到解决。
gcc -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -idirafter /u-boot-2010.09/u-boot-2010.09/include
-idirafter /u-boot-2010.09/u-boot-2010.09/include2 -idirafter /u-boot-2010.09/u-boot-2010.09/include
-I /u-boot-2010.09/u-boot-2010.09/lib/libfdt -I /u-boot-2010.09/u-boot-2010.09/tools
-DTEXT_BASE=0x11080000 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -pedantic -o img2srec.o img2srec.c -c
gcc -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -idirafter /u-boot-2010.09/u-boot-2010.09/include
-idirafter /u-boot-2010.09/u-boot-2010.09/include2 -idirafter /u-boot-2010.09/u-boot-2010.09/include
-I /u-boot-2010.09/u-boot-2010.09/lib/libfdt -I /u-boot-2010.09/u-boot-2010.09/tools
-DTEXT_BASE=0x11080000 -DUSE_HOSTCC -D__KERNEL_STRICT_NAMES -pedantic -o img2srec img2srec.o
strip img2srec
可以看到正常生成了 img2srec.o
5、后记
C语言标准比较多，gcc支持的也比较多，相关关键字有：
gcc-4.5支持的C语言标准
1 -ansi In C mode, this is equivalent to ‘-std=c89’. In C++ mode, it is equivalent to ‘-std=c++’.
-std= Determine the language standard. A value for this option must be provided; possible values are
‘c89’
‘iso9899:’
Support all ISO C90 programs (certain GNU extensions that conflict
with ISO C90 are disabled). Same as ‘-ansi’ for C code.
‘iso9899:’
ISO C90 as modified in amendment .
‘c99’
‘c9x’
11 ‘iso9899:’
12 ‘iso9899:199x’
ISO C99. Note that this standard is not yet fully supported;
see http://gcc.gnu.org/gcc-4.3/c99status.html for more information.
The names ‘c9x’ and ‘iso9899:199x’ are deprecated.
‘gnu89’ GNU dialect of ISO C90 (including some C99 features). This is the default for C code.
17 ‘gnu99’
‘gnu9x’ GNU dialect of ISO C99. When ISO C99 is fully implemented in GCC, this will become the default.
The name ‘gnu9x’ is deprecated.
‘c++’ The ISO C++ standard plus amendments. Same as ‘-ansi’ for C++ code.
‘gnu++’ GNU dialect of ‘-std=c++’. This is the default for C++ code.
‘c++0x’ The working draft of the upcoming ISO C++0x standard. This option enables experimental features
that are likely to be included in C++0x. The working draft is constantly changing,
and any feature that is enabled by this flag may be removed from future versions of GCC
if it is not part of the C++0x standard.
‘gnu++0x’ GNU dialect of ‘-std=c++0x’. This option enables experimental features
that may be removed in future versions of GCC.
===【未完待续】===