Question

I’m trying to compile GCC 4.7.2 on a Buffalo LinkStation Pro Duo (after unlocking it) which runs Linux 2.6.31.8 armv5tel.

Unfortunately, make throws quite some errors, starting with

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

Line 53 of real.h reads unsigned long sig[SIGSZ];, where SIGSZ is defined at line 40 as
#define SIGSZ (SIGNIFICAND_BITS / HOST_BITS_PER_LONG)
while line 87 is #if REAL_WIDTH == 1 with REAL_WIDTH defined starting at line 72 as
#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 */

This seems to boil down to the HOST_BITS_PER_* being zero. Do I have to define these manually with some configure parameter or how can this issue be resolved?

---

update

config.log contains the following errors:

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

Following this post I seem to have forgotten to install ppl, which I’ll try now

Answer 1

SIZEOF_LONG should be #defined by configure in the file auto-host.h. Your auto-host.h should contain something like:

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

If the above is not present (and it looks like in your case it’s indeed so), check config.log for errors. Search for errors around the string checking size of long.