Mercurial > hg > octave-lojdl > gnulib-hg
changeset 5558:6260000d86d2
(gl_C99_STRTOLD): New macro.
(gl_C_STRTOD): Use it instead of AC_CHECK_DECLS_ONCE(strtold).
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Fri, 24 Dec 2004 08:36:41 +0000 |
| parents | 94babf286465 |
| children | 9ea03dc062ed |
| files | m4/c-strtod.m4 |
| diffstat | 1 files changed, 29 insertions(+), 2 deletions(-) [+] |
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--- a/m4/c-strtod.m4 +++ b/m4/c-strtod.m4 @@ -1,4 +1,4 @@ -# c-strtod.m4 serial 3 +# c-strtod.m4 serial 4 # Copyright (C) 2004 Free Software Foundation, Inc. @@ -18,6 +18,32 @@ # Written by Paul Eggert. +AC_DEFUN([gl_C99_STRTOLD], +[ + AC_CACHE_CHECK([whether strtold conforms to C99], + [gl_cv_func_c99_strtold], + [AC_COMPILE_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 <stdlib.h> + 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], [ dnl Prerequisites of lib/c-strtod.c. @@ -29,5 +55,6 @@ [ dnl Prerequisites of lib/c-strtold.c. AC_REQUIRE([gl_C_STRTOD]) - AC_CHECK_DECLS_ONCE([strtold]) + AC_REQUIRE([gl_C99_STRTOLD]) + : ])