gcc - GCC编译产生此处未声明的 “real.h:53: error: ' SIZEOF_LONG'(不在函数中)”

Question

我正在尝试在运行Linux 2.6.31.8 armv5tel的Buffalo LinkStation Pro Duo(在unlocking之后)上编译GCC 4.7.2。

不幸的是，make会引发很多错误，从

gcc -c  -DIN_GCC_FRONTEND -g -fkeep-inline-functions -DIN_GCC   -W -Wall -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-formIn file included from ../../gcc-4.7.2/gcc/tree.h:32,
                 from ../../gcc-4.7.2/gcc/c-lang.c:27:
../../gcc-4.7.2/gcc/real.h:53: error: 'SIZEOF_LONG' undeclared here (not in a function)
In file included from ../../gcc-4.7.2/gcc/tree.h:32,
                 from ../../gcc-4.7.2/gcc/c-lang.c:27:
../../gcc-4.7.2/gcc/real.h:87:5: error: division by zero in #if
../../gcc-4.7.2/gcc/real.h:87:5: error: division by zero in #if
../../gcc-4.7.2/gcc/real.h:90:6: error: division by zero in #if

real.h的第53行读取 unsigned long sig[SIGSZ];，其中 SIGSZ在第40行定义为 #define SIGSZ (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)而第87行是 #if REAL_WIDTH == 1，其中 REAL_WIDTH从第72行开始定义为 #define REAL_WIDTH \

(REAL_VALUE_TYPE_SIZE/HOST_BITS_PER_WIDE_INT \

+ (REAL_VALUE_TYPE_SIZE%HOST_BITS_PER_WIDE_INT ? 1 : 0)) /* round up */
这似乎归结为 HOST_BITS_PER_*为零。我是否必须使用 configure参数手动定义它们，或者如何解决此问题？

更新
config.log包含以下错误:

conftest.c:10:19: error: ppl_c.h: No such file or directory
conftest.c: In function 'main':
conftest.c:16: error: 'choke' undeclared (first use in this function)
conftest.c:16: error: (Each undeclared identifier is reported only once
conftest.c:16: error: for each function it appears in.)
conftest.c:16: error: expected ';' before 'me'
configure:5708: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME ""
| #define PACKAGE_TARNAME ""
| #define PACKAGE_VERSION ""
| #define PACKAGE_STRING ""
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| #define LT_OBJDIR ".libs/"
| /* end confdefs.h.  */
| #include "ppl_c.h"
| int
| main ()
| {
|.
|     #if PPL_VERSION_MAJOR != 0 || PPL_VERSION_MINOR < 11
|     choke me
|     #endif
|.
|   ;
|   r

在 this post之后，我似乎已经忘记安装 ppl了，我现在将尝试

Answer 1

SIZEOF_LONG应该是#define文件中configure的auto-host.h d。您的auto-host.h应该包含以下内容:

/* The size of `long', as computed by sizeof. */
#ifndef USED_FOR_TARGET
#define SIZEOF_LONG 8
#endif

如果上述内容不存在(看起来确实如此)，请检查 config.log是否存在错误。搜索字符串 checking size of long周围的错误。