binutils-gdb/gnulib/import/m4/exponentl.m4
Paul E. Murphy 9c9d63b15a gnulib: update to 776af40e0
This fixes PR27184, a failure to compile gdb due to
cdefs.h being out of sync with glibc on ppc64le targets
which are compiled with -mabi=ieeelongdouble and glibc
2.32.

Likewise, update usage of _GL_ATTRIBUTE_FORMAT_PRINTF to
_GL_ATTRIBUTE_FORMAT_PRINTF_STANDARD.

Likewise, disable newly added rpl_free gnulib api in
gdbserver support libraries.

Likewise, undefine read/write macros before redefining them
on mingw targets.

Likewise, wrap C++ usage of free with GNULIB_NAMESPACE namespace
as needed.

Change-Id: I86517613c0d8ac8f5ea45bbc4ebe2b54a3aef29f
2021-02-05 13:35:20 -05:00

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# exponentl.m4 serial 5
dnl Copyright (C) 2007-2021 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_LONG_DOUBLE_EXPONENT_LOCATION],
[
AC_REQUIRE([gl_BIGENDIAN])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([where to find the exponent in a 'long double'],
[gl_cv_cc_long_double_expbit0],
[
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[
#include <float.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#define NWORDS \
((sizeof (long double) + sizeof (unsigned int) - 1) / sizeof (unsigned int))
typedef union { long double value; unsigned int word[NWORDS]; }
memory_long_double;
static unsigned int ored_words[NWORDS];
static unsigned int anded_words[NWORDS];
static void add_to_ored_words (long double *x)
{
memory_long_double m;
size_t i;
/* Clear it first, in case
sizeof (long double) < sizeof (memory_long_double). */
memset (&m, 0, sizeof (memory_long_double));
m.value = *x;
for (i = 0; i < NWORDS; i++)
{
ored_words[i] |= m.word[i];
anded_words[i] &= m.word[i];
}
}
int main ()
{
static long double samples[5] = { 0.25L, 0.5L, 1.0L, 2.0L, 4.0L };
size_t j;
FILE *fp = fopen ("conftest.out", "w");
if (fp == NULL)
return 1;
for (j = 0; j < NWORDS; j++)
anded_words[j] = ~ (unsigned int) 0;
for (j = 0; j < 5; j++)
add_to_ored_words (&samples[j]);
/* Remove bits that are common (e.g. if representation of the first mantissa
bit is explicit). */
for (j = 0; j < NWORDS; j++)
ored_words[j] &= ~anded_words[j];
/* Now find the nonzero word. */
for (j = 0; j < NWORDS; j++)
if (ored_words[j] != 0)
break;
if (j < NWORDS)
{
size_t i;
for (i = j + 1; i < NWORDS; i++)
if (ored_words[i] != 0)
{
fprintf (fp, "unknown");
return (fclose (fp) != 0);
}
for (i = 0; ; i++)
if ((ored_words[j] >> i) & 1)
{
fprintf (fp, "word %d bit %d", (int) j, (int) i);
return (fclose (fp) != 0);
}
}
fprintf (fp, "unknown");
return (fclose (fp) != 0);
}
]])],
[gl_cv_cc_long_double_expbit0=`cat conftest.out`],
[gl_cv_cc_long_double_expbit0="unknown"],
[
dnl When cross-compiling, in general we don't know. It depends on the
dnl ABI and compiler version. There are too many cases.
gl_cv_cc_long_double_expbit0="unknown"
case "$host_os" in
mingw*) # On native Windows (little-endian), we know the result
# in two cases: mingw, MSVC.
AC_EGREP_CPP([Known], [
#ifdef __MINGW32__
Known
#endif
], [gl_cv_cc_long_double_expbit0="word 2 bit 0"])
AC_EGREP_CPP([Known], [
#ifdef _MSC_VER
Known
#endif
], [gl_cv_cc_long_double_expbit0="word 1 bit 20"])
;;
esac
])
rm -f conftest.out
])
case "$gl_cv_cc_long_double_expbit0" in
word*bit*)
word=`echo "$gl_cv_cc_long_double_expbit0" | sed -e 's/word //' -e 's/ bit.*//'`
bit=`echo "$gl_cv_cc_long_double_expbit0" | sed -e 's/word.*bit //'`
AC_DEFINE_UNQUOTED([LDBL_EXPBIT0_WORD], [$word],
[Define as the word index where to find the exponent of 'long double'.])
AC_DEFINE_UNQUOTED([LDBL_EXPBIT0_BIT], [$bit],
[Define as the bit index in the word where to find bit 0 of the exponent of 'long double'.])
;;
esac
])