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(AC_LANG_BOOL_COMPILE_TRY(C)): Make the array

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static, to catch errors if the value isn't known at compile-time
and the compiler supports dynamic arrays.  Change its name from
`_array_' to `test_array' to avoid potential name clashes.
(AC_C_LONG_DOUBLE): Make it a compile-time test, not a run-time
test.  Do not define HAVE_LONG_DOUBLE if `long double' is no
better than double.  Catch a bug in GCC 2.95.2 x86.
This commit is contained in:
Paul Eggert 2001-11-16 20:09:58 +00:00
parent 2f4a677544
commit 71a641098a
1 changed files with 15 additions and 19 deletions
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34
lib/autoconf/c.m4
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@ -197,8 +197,8 @@ f = $1;
# Be sure to use this array to avoid `unused' warnings, which are even
# errors with `-W error'.
m4_define([AC_LANG_BOOL_COMPILE_TRY(C)],
[AC_LANG_PROGRAM([$1], [int _array_ @<:@1 - 2 * !($2)@:>@;
_array_ @<:@0@:>@ = 0
[AC_LANG_PROGRAM([$1], [static int test_array @<:@1 - 2 * !($2)@:>@;
test_array @<:@0@:>@ = 0
])])
@ -828,25 +828,21 @@ fi
# AC_C_LONG_DOUBLE
# ----------------
AC_DEFUN([AC_C_LONG_DOUBLE],
[AC_CACHE_CHECK(for long double, ac_cv_c_long_double,
[if test "$GCC" = yes; then
ac_cv_c_long_double=yes
else
AC_TRY_RUN(
[int
main ()
{
/* The Stardent Vistra knows sizeof(long double), but does not
support it. */
long double foo = 0.0;
/* On Ultrix 4.3 cc, long double is 4 and double is 8. */
exit (sizeof (long double) < sizeof (double));
}],
ac_cv_c_long_double=yes, ac_cv_c_long_double=no)
fi])
[AC_CACHE_CHECK(
[for working long double with more range or precision than double],
[ac_cv_c_long_double],
[AC_COMPILE_IFELSE(
[AC_LANG_BOOL_COMPILE_TRY(
[#include <float.h>
long double foo = 0.0;],
[/* Using '|' rather than '||' catches a GCC 2.95.2 x86 bug. */
(DBL_MAX < LDBL_MAX) | (LDBL_EPSILON < DBL_EPSILON)
| (DBL_MAX_EXP < LDBL_MAX_EXP) | (DBL_MANT_DIG < LDBL_MANT_DIG)])],
ac_cv_c_long_double=yes,
ac_cv_c_long_double=no)])
if test $ac_cv_c_long_double = yes; then
AC_DEFINE(HAVE_LONG_DOUBLE, 1,
[Define to 1 if the `long double' type works.])
[Define to 1 if long double works and has more range or precision than double.])
fi
])# AC_C_LONG_DOUBLE