- exit (0);
-}
-], am_cv_func_strtod=yes, am_cv_func_strtod=no, am_cv_func_strtod=no)])
-test $am_cv_func_strtod = no && LIBOBJS="$LIBOBJS strtod.o"
-AC_SUBST(LIBOBJS)dnl
-am_cv_func_strtod_needs_libm=no
-if test $am_cv_func_strtod = no; then
- AC_CHECK_FUNCS(pow)
- if test $ac_cv_func_pow = no; then
- AC_CHECK_LIB(m, pow, [am_cv_func_strtod_needs_libm=yes],
- [AC_MSG_WARN(can't find library containing definition of pow)])
+ {
+ /* Older glibc and Cygwin mis-parse "-0x". */
+ const char *string = "-0x";
+ char *term;
+ double value = strtod (string, &term);
+ double zero = 0.0;
+ if (1.0 / value != -1.0 / zero || term != (string + 2))
+ result |= 4;
+ }
+ {
+ /* Many platforms do not parse hex floats. */
+ const char *string = "0XaP+1";
+ char *term;
+ double value = strtod (string, &term);
+ if (value != 20.0 || term != (string + 6))
+ result |= 8;
+ }
+ {
+ /* Many platforms do not parse infinities. HP-UX 11.31 parses inf,
+ but mistakenly sets errno. */
+ const char *string = "inf";
+ char *term;
+ double value;
+ errno = 0;
+ value = strtod (string, &term);
+ if (value != HUGE_VAL || term != (string + 3) || errno)
+ result |= 16;
+ }
+ {
+ /* glibc 2.7 and cygwin 1.5.24 misparse "nan()". */
+ const char *string = "nan()";
+ char *term;
+ double value = strtod (string, &term);
+ if (numeric_equal (value, value) || term != (string + 5))
+ result |= 32;
+ }
+ {
+ /* darwin 10.6.1 misparses "nan(". */
+ const char *string = "nan(";
+ char *term;
+ double value = strtod (string, &term);
+ if (numeric_equal (value, value) || term != (string + 3))
+ result |= 64;
+ }
+ return result;
+]])],
+ [gl_cv_func_strtod_works=yes],
+ [gl_cv_func_strtod_works=no],
+ [dnl The last known bugs in glibc strtod(), as of this writing,
+ dnl were fixed in version 2.8
+ AC_EGREP_CPP([Lucky user],
+ [
+#include <features.h>
+#ifdef __GNU_LIBRARY__
+ #if ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 8) || (__GLIBC__ > 2)) \
+ && !defined __UCLIBC__
+ Lucky user
+ #endif
+#endif
+ ],
+ [gl_cv_func_strtod_works=yes],
+ [gl_cv_func_strtod_works="guessing no"])])])
+ if test "$gl_cv_func_strtod_works" != yes; then
+ REPLACE_STRTOD=1
+ fi
+ fi
+ if test $HAVE_STRTOD = 0 || test $REPLACE_STRTOD = 1; then
+ AC_LIBOBJ([strtod])
+ gl_PREREQ_STRTOD
+ fi
+])
+
+# Prerequisites of lib/strtod.c.
+AC_DEFUN([gl_PREREQ_STRTOD], [
+ AC_REQUIRE([gl_CHECK_LDEXP_NO_LIBM])
+ if test $gl_cv_func_ldexp_no_libm = yes; then
+ AC_DEFINE([HAVE_LDEXP_IN_LIBC], [1],
+ [Define if the ldexp function is available in libc.])