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r8844@totoro: nickm | 2006-10-02 16:32:44 -0400

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Resolve an XXXX: make sure that we are actually on 2s-complement hardware.


svn:r8576
This commit is contained in:
Nick Mathewson 2006-10-02 21:00:20 +00:00
parent 14f9b537d1
commit 36adc7cdd9
2 changed files with 27 additions and 3 deletions
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21
configure.in
View File

@ -588,6 +588,27 @@ if test $tor_cv_malloc_zero_works = yes; then
[Define to 1 iff malloc(0) returns a pointer])
fi
# whether we seem to be in a 2s-complement world.
if test -z "$CROSS_COMPILE"; then
AC_CACHE_CHECK([whether we are using 2s-complement arithmetic], tor_cv_twos_complement,
[AC_RUN_IFELSE([AC_LANG_SOURCE(
[[int main () { int problem = ((-99) != (~99)+1);
return problem ? 1 : 0; }]])],
[tor_cv_twos_complement=yes],
[tor_cv_twos_complement=no],
[tor_cv_twos_complement=cross])])
else
# Cross-compiling; let's hope that the target isn't raving mad.
AC_MSG_NOTICE([Cross-compiling: we'll assume that NULL is represented as a sequence of 0-valued bytes.])
tor_cv_twos_complement=yes
fi
if test $tor_cv_twos_complement = yes; then
AC_DEFINE([USING_TWOS_COMPLEMENT], 1,
[Define to 1 iff we represent negative integers with two's complement])
fi
# Whether we should use the dmalloc memory allocation debugging library.
AC_MSG_CHECKING(whether to use dmalloc (debug memory allocation library))
AC_ARG_WITH(dmalloc,

9
src/common/torint.h
View File

@ -220,9 +220,12 @@ typedef uint32_t uintptr_t;
#error "Missing type uint64_t"
#endif
/* XXXX This assumes a sane (2's-complement) representation. But if you
* aren't 2's complement, and you don't define LONG_MAX, then you're so
* bizarre that I want nothing to do with you. */
/* This assumes a sane (2's-complement) representation. But if you
* aren't 2's complement, and you don't define LONG_MAX, then you're so
* bizarre that I want nothing to do with you. */
#ifndef USING_TWOS_COMPLEMENT
#error "Seems that your platform doesn't use 2's complement arithmetic. Argh."
#endif
#ifndef LONG_MAX
#if (SIZEOF_LONG == 4)
#define LONG_MAX 0x7fffffffL