# c-strtod.m4 serial 9 # Copyright (C) 2004, 2005, 2006 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 Paul Eggert. AC_DEFUN([gl_C99_STRTOLD], [ AC_CACHE_CHECK([whether strtold conforms to C99], [gl_cv_func_c99_strtold], [AC_LINK_IFELSE( [AC_LANG_PROGRAM( [[/* On HP-UX before 11.23, strtold returns a struct instead of long double. Reject implementations like that, by requiring compatibility with the C99 prototype. */ #include static long double (*p) (char const *, char **) = strtold; static long double test (char const *nptr, char **endptr) { long double r; r = strtold (nptr, endptr); return r; }]], [[return test ("1.0", NULL) != 1 || p ("1.0", NULL) != 1;]])], [gl_cv_func_c99_strtold=yes], [gl_cv_func_c99_strtold=no])]) if test $gl_cv_func_c99_strtold = yes; then AC_DEFINE([HAVE_C99_STRTOLD], 1, [Define to 1 if strtold conforms to C99.]) fi ]) AC_DEFUN([gl_C_STRTOD], [ AC_LIBOBJ([c-strtod]) dnl Prerequisites of lib/c-strtod.c. AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) : ]) AC_DEFUN([gl_C_STRTOLD], [ AC_LIBOBJ([c-strtold]) dnl Prerequisites of lib/c-strtold.c. AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) AC_REQUIRE([gl_C99_STRTOLD]) : ])