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45 lines
1.4 KiB
Plaintext
45 lines
1.4 KiB
Plaintext
#serial 1
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# Determine whether calloc (N, S) works when N*S is zero.
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# If so, define HAVE_CALLOC. Otherwise, define calloc to rpl_calloc
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# and arrange to use a calloc wrapper function that does work in that case.
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# _AC_FUNC_CALLOC_IF(IF-WORKS, IF-NOT)
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# -------------------------------------
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# If `calloc (0, 0)' is properly handled, run IF-WORKS, otherwise, IF-NOT.
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AC_DEFUN([_AC_FUNC_CALLOC_IF],
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[AC_REQUIRE([AC_HEADER_STDC])dnl
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AC_CHECK_HEADERS(stdlib.h)
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AC_CACHE_CHECK([for GNU libc compatible calloc], ac_cv_func_calloc_0_nonnull,
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[AC_RUN_IFELSE(
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[AC_LANG_PROGRAM(
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[[#if STDC_HEADERS || HAVE_STDLIB_H
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# include <stdlib.h>
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#else
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char *calloc ();
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#endif
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]],
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[exit (calloc (0, 0) ? 0 : 1);])],
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[ac_cv_func_calloc_0_nonnull=yes],
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[ac_cv_func_calloc_0_nonnull=no],
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[ac_cv_func_calloc_0_nonnull=no])])
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AS_IF([test $ac_cv_func_calloc_0_nonnull = yes], [$1], [$2])
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])# AC_FUNC_CALLOC
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# AC_FUNC_CALLOC
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# ---------------
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# Report whether `calloc (0, 0)' is properly handled, and replace calloc if
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# needed.
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AN_FUNCTION([calloc], [AC_FUNC_CALLOC])
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AC_DEFUN([AC_FUNC_CALLOC],
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[_AC_FUNC_CALLOC_IF(
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[AC_DEFINE([HAVE_CALLOC], 1,
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[Define to 1 if your system has a GNU libc compatible `calloc'
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function, and to 0 otherwise.])],
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[AC_DEFINE([HAVE_CALLOC], 0)
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AC_LIBOBJ([calloc])
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AC_DEFINE([calloc], [rpl_calloc],
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[Define to rpl_calloc if the replacement function should be used.])])
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])# AC_FUNC_CALLOC
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