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LONG_LONG_MIN
From: |
Bruno Haible |
Subject: |
LONG_LONG_MIN |
Date: |
Sun, 7 Mar 2010 20:29:08 +0100 |
User-agent: |
KMail/1.9.9 |
Hi,
Compiling a gnulib testdir on Solaris/x86 with Sun C, I get these errors:
cc -O -xc99=all -DHAVE_CONFIG_H -DEXEEXT=\"\" -DEXEEXT=\"\" -DNO_XMALLOC
-DEXEEXT=\"\" -I. -I.. -I../intl -I/home/haible/prefix-x86/include
-D_REENTRANT -g -c -o xstrtoll.o xstrtoll.c
"xstrtol.c", line 49: undefined symbol: LONG_LONG_MIN
"xstrtol.c", line 54: undefined symbol: LONG_LONG_MAX
cc: acomp failed for xstrtoll.c
*** Error code 2
cc -O -xc99=all -DHAVE_CONFIG_H -DEXEEXT=\"\" -DEXEEXT=\"\" -DNO_XMALLOC
-DEXEEXT=\"\" -I. -I.. -I../intl -I/home/haible/prefix-x86/include
-D_REENTRANT -g -c -o xstrtoull.o xstrtoull.c
"xstrtol.c", line 54: undefined symbol: ULONG_LONG_MAX
cc: acomp failed for xstrtoull.c
*** Error code 2
The reason is that the files strtol.c, xstrtoll.c, lib/xstrtoull.c use the
macros LONG_LONG_MIN, LONG_LONG_MAX, ULONG_LONG_MAX. But these macros are
not standard. ISO C99 and POSIX specify that <limits.h> defines
LLONG_MIN, LLONG_MAX, ULLONG_MAX. The macros LONG_LONG_MIN, LONG_LONG_MAX,
ULONG_LONG_MAX come from gcc's <limits.h>:
#if defined (__GNU_LIBRARY__) ? defined (__USE_GNU) : !defined
(__STRICT_ANSI__)
/* Minimum and maximum values a `signed long long int' can hold. */
# undef LONG_LONG_MIN
# define LONG_LONG_MIN (-LONG_LONG_MAX - 1LL)
# undef LONG_LONG_MAX
# define LONG_LONG_MAX __LONG_LONG_MAX__
/* Maximum value an `unsigned long long int' can hold. (Minimum is 0). */
# undef ULONG_LONG_MAX
# define ULONG_LONG_MAX (LONG_LONG_MAX * 2ULL + 1ULL)
#endif
As you can see, these are not even defined with "gcc -ansi".
Suggestions? Should we use LLONG_MIN or better rely on the macros from
<stdint.h>?
Bruno
- LONG_LONG_MIN,
Bruno Haible <=