calloc.m4

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Hash : 86a9695e
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Date : 2023-02-17T16:24:34

Improve cross-compilation from midipix.

Reported by Ørjan Malde <red@foxi.me> at
<https://lists.gnu.org/archive/html/bug-gnulib/2023-02/msg00131.html>.

Since midipix consists of musl libc based on an emulation of Linux system
calls, for pure libc functionality it can be treated like musl libc.

* m4/calloc.m4 (_AC_FUNC_CALLOC_IF): Treat midipix like systems with
musl libc.
* m4/cbrtl.m4 (gl_FUNC_CBRTL): Likewise.
* m4/ceil.m4 (gl_FUNC_CEIL): Likewise.
* m4/ceilf.m4 (gl_FUNC_CEILF): Likewise.
* m4/ceill.m4 (gl_FUNC_CEILL): Likewise.
* m4/exp2l.m4 (gl_FUNC_EXP2L): Likewise.
* m4/expl.m4 (gl_FUNC_EXPL): Likewise.
* m4/expm1.m4 (gl_FUNC_EXPM1): Likewise.
* m4/expm1f.m4 (gl_FUNC_EXPM1F): Likewise.
* m4/expm1l.m4 (gl_FUNC_EXPM1L): Likewise.
* m4/fclose.m4 (gl_FUNC_FCLOSE_STDIN): Likewise.
* m4/fdopendir.m4 (gl_FUNC_FDOPENDIR): Likewise.
* m4/ffsll.m4 (gl_FUNC_FFSLL): Likewise.
* m4/floor.m4 (gl_FUNC_FLOOR): Likewise.
* m4/floorf.m4 (gl_FUNC_FLOORF): Likewise.
* m4/fmod.m4 (gl_FUNC_FMOD): Likewise.
* m4/fmodf.m4 (gl_FUNC_FMODF): Likewise.
* m4/fmodl.m4 (gl_FUNC_FMODL): Likewise.
* m4/fnmatch.m4 (gl_FUNC_FNMATCH_POSIX): Likewise.
* m4/fopen.m4 (gl_FUNC_FOPEN_GNU): Likewise.
* m4/fpurge.m4 (gl_FUNC_FPURGE): Likewise.
* m4/getdelim.m4 (gl_FUNC_GETDELIM): Likewise.
* m4/getline.m4 (gl_FUNC_GETLINE): Likewise.
* m4/hypot.m4 (gl_FUNC_HYPOT): Likewise.
* m4/hypotf.m4 (gl_FUNC_HYPOTF): Likewise.
* m4/hypotl.m4 (gl_FUNC_HYPOTL): Likewise.
* m4/iconv_open-utf.m4 (gl_FUNC_ICONV_OPEN_UTF_SUPPORT): Likewise.
* m4/log.m4 (gl_FUNC_LOG): Likewise.
* m4/log10.m4 (gl_FUNC_LOG10): Likewise.
* m4/log10f.m4 (gl_FUNC_LOG10F): Likewise.
* m4/log10l.m4 (gl_FUNC_LOG10L_WORKS): Likewise.
* m4/log1p.m4 (gl_FUNC_LOG1P): Likewise.
* m4/log1pf.m4 (gl_FUNC_LOG1PF): Likewise.
* m4/log1pl.m4 (gl_FUNC_LOG1PL, gl_FUNC_LOG1PL_WORKS): Likewise.
* m4/log2.m4 (gl_FUNC_LOG2): Likewise.
* m4/log2f.m4 (gl_FUNC_LOG2F): Likewise.
* m4/log2l.m4 (gl_FUNC_LOG2L_WORKS): Likewise.
* m4/logf.m4 (gl_FUNC_LOGF): Likewise.
* m4/logl.m4 (gl_FUNC_LOGL_WORKS): Likewise.
* m4/malloc.m4 (_AC_FUNC_MALLOC_IF): Likewise.
* m4/mkstemp.m4 (gl_FUNC_MKSTEMP): Likewise.
* m4/modf.m4 (gl_FUNC_MODF): Likewise.
* m4/modff.m4 (gl_FUNC_MODFF): Likewise.
* m4/modfl.m4 (gl_FUNC_MODFL): Likewise.
* m4/musl.m4 (gl_MUSL_LIBC): Likewise.
* m4/perror.m4 (gl_FUNC_PERROR): Likewise.
* m4/posix_spawn.m4 (gl_POSIX_SPAWN_SECURE,
gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDCLOSE,
gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDDUP2,
gl_FUNC_POSIX_SPAWN_FILE_ACTIONS_ADDOPEN): Likewise.
* m4/printf.m4 (gl_PRINTF_SIZES_C99, gl_PRINTF_INFINITE,
gl_PRINTF_INFINITE_LONG_DOUBLE, gl_PRINTF_DIRECTIVE_A,
gl_PRINTF_DIRECTIVE_F, gl_PRINTF_FLAG_ZERO, gl_SNPRINTF_TRUNCATION_C99,
gl_SNPRINTF_RETVAL_C99, gl_SNPRINTF_DIRECTIVE_N,
gl_VSNPRINTF_ZEROSIZE_C99): Likewise.
* m4/pthread_rwlock_rdlock.m4 (gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER):
Likewise.
* m4/putenv.m4 (gl_FUNC_PUTENV): Likewise.
* m4/realloc.m4 (_AC_FUNC_REALLOC_IF): Likewise.
* m4/remainder.m4 (gl_FUNC_REMAINDER): Likewise.
* m4/remainderf.m4 (gl_FUNC_REMAINDERF): Likewise.
* m4/remainderl.m4 (gl_FUNC_REMAINDERL, gl_FUNC_REMAINDERL_WORKS):
Likewise.
* m4/rintl.m4 (gl_FUNC_RINTL): Likewise.
* m4/round.m4 (gl_FUNC_ROUND): Likewise.
* m4/roundf.m4 (gl_FUNC_ROUNDF): Likewise.
* m4/roundl.m4 (gl_FUNC_ROUNDL): Likewise.
* m4/setenv.m4 (gl_FUNC_SETENV): Likewise.
* m4/setlocale_null.m4 (gl_FUNC_SETLOCALE_NULL): Likewise.
* m4/signbit.m4 (gl_SIGNBIT): Likewise.
* m4/stpncpy.m4 (gl_FUNC_STPNCPY): Likewise.
* m4/strerror.m4 (gl_FUNC_STRERROR, gl_FUNC_STRERROR_0): Likewise.
* m4/strtod.m4 (gl_FUNC_STRTOD): Likewise.
* m4/strtold.m4 (gl_FUNC_STRTOLD): Likewise.
* m4/trunc.m4 (gl_FUNC_TRUNC): Likewise.
* m4/truncf.m4 (gl_FUNC_TRUNCF): Likewise.
* m4/truncl.m4 (gl_FUNC_TRUNCL): Likewise.
* m4/ungetc.m4 (gl_FUNC_UNGETC_WORKS): Likewise.
* m4/wcwidth.m4 (gl_FUNC_WCWIDTH): Likewise.

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m4/calloc.m4

# calloc.m4 serial 30

# Copyright (C) 2004-2023 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

# Written by Jim Meyering.

# Determine whether calloc (N, S) returns non-NULL when N*S is zero,
# and returns NULL when N*S overflows.
# If so, define HAVE_CALLOC.  Otherwise, define calloc to rpl_calloc
# and arrange to use a calloc wrapper function that does work in that case.

# _AC_FUNC_CALLOC_IF([IF-WORKS], [IF-NOT])
# -------------------------------------
# If calloc is compatible with GNU calloc, run IF-WORKS, otherwise, IF-NOT.
AC_DEFUN([_AC_FUNC_CALLOC_IF],
[
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether calloc (0, n) and calloc (n, 0) return nonnull],
    [ac_cv_func_calloc_0_nonnull],
    [if test $cross_compiling != yes; then
       ac_cv_func_calloc_0_nonnull=yes
       AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
            [AC_INCLUDES_DEFAULT],
            [[int result = 0;
              char * volatile p = calloc (0, 0);
              if (!p)
                result |= 1;
              free (p);
              return result;
            ]])],
         [],
         [ac_cv_func_calloc_0_nonnull=no])
     else
       case "$host_os" in
                             # Guess yes on glibc systems.
         *-gnu* | gnu*)      ac_cv_func_calloc_0_nonnull="guessing yes" ;;
                             # Guess yes on musl systems.
         *-musl* | midipix*) ac_cv_func_calloc_0_nonnull="guessing yes" ;;
                             # Guess yes on native Windows.
         mingw*)             ac_cv_func_calloc_0_nonnull="guessing yes" ;;
                             # If we don't know, obey --enable-cross-guesses.
         *)                  ac_cv_func_calloc_0_nonnull="$gl_cross_guess_normal" ;;
       esac
     fi
    ])
  AS_CASE([$ac_cv_func_calloc_0_nonnull], [*yes], [$1], [$2])
])


# gl_FUNC_CALLOC_GNU
# ------------------
# Replace calloc if it is not compatible with GNU libc.
AC_DEFUN([gl_FUNC_CALLOC_GNU],
[
  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
  AC_REQUIRE([gl_FUNC_CALLOC_POSIX])
  REPLACE_CALLOC_FOR_CALLOC_GNU="$REPLACE_CALLOC_FOR_CALLOC_POSIX"
  if test $REPLACE_CALLOC_FOR_CALLOC_GNU = 0; then
    _AC_FUNC_CALLOC_IF([], [REPLACE_CALLOC_FOR_CALLOC_GNU=1])
  fi
])# gl_FUNC_CALLOC_GNU

# gl_FUNC_CALLOC_POSIX
# --------------------
# Test whether 'calloc' is POSIX compliant (sets errno to ENOMEM when it
# fails, and doesn't mess up with ptrdiff_t or size_t overflow),
# and replace calloc if it is not.
AC_DEFUN([gl_FUNC_CALLOC_POSIX],
[
  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
  AC_REQUIRE([gl_FUNC_MALLOC_POSIX])
  if test $REPLACE_MALLOC_FOR_MALLOC_POSIX = 1; then
    REPLACE_CALLOC_FOR_CALLOC_POSIX=1
  fi
  dnl Although in theory we should also test for size_t overflow,
  dnl in practice testing for ptrdiff_t overflow suffices
  dnl since PTRDIFF_MAX <= SIZE_MAX on all known Gnulib porting targets.
  dnl A separate size_t test would slow down 'configure'.
])

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m4/calloc.m4