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50 lines
1.6 KiB
Plaintext
50 lines
1.6 KiB
Plaintext
# c-strtod.m4 serial 15
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# Copyright (C) 2004-2006, 2009-2017 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# Written by Paul Eggert.
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AC_DEFUN([gl_C99_STRTOLD],
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[
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AC_CACHE_CHECK([whether strtold conforms to C99],
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[gl_cv_func_c99_strtold],
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[AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[/* On HP-UX before 11.23, strtold returns a struct instead of
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long double. Reject implementations like that, by requiring
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compatibility with the C99 prototype. */
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#include <stdlib.h>
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static long double (*p) (char const *, char **) = strtold;
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static long double
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test (char const *nptr, char **endptr)
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{
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long double r;
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r = strtold (nptr, endptr);
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return r;
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}]],
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[[return test ("1.0", NULL) != 1 || p ("1.0", NULL) != 1;]])],
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[gl_cv_func_c99_strtold=yes],
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[gl_cv_func_c99_strtold=no])])
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if test $gl_cv_func_c99_strtold = yes; then
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AC_DEFINE([HAVE_C99_STRTOLD], [1], [Define to 1 if strtold conforms to C99.])
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fi
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])
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dnl Prerequisites of lib/c-strtod.c.
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AC_DEFUN([gl_C_STRTOD],
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[
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_CHECK_FUNCS([strtod_l])
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])
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dnl Prerequisites of lib/c-strtold.c.
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AC_DEFUN([gl_C_STRTOLD],
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[
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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AC_REQUIRE([gl_C99_STRTOLD])
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AC_CHECK_FUNCS([strtold_l])
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])
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