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| author | Paul Eggert <eggert@cs.ucla.edu> | 2004-12-20 07:56:51 +0000 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2004-12-20 07:56:51 +0000 |
| commit | 8fd72ab7e48b3450c1ab484b73d9b40bec2f9478 (patch) | |
| tree | d1c4bbddba34f2e30f35f0c1ecbaa3fe0bee4149 /m4/c-strtod.m4 | |
| parent | 7bb6fb4250d5d940468563ed8e5481e1886b9951 (diff) | |
| download | coreutils-8fd72ab7e48b3450c1ab484b73d9b40bec2f9478.tar.xz | |
(gl_C99_STRTOLD): New macro.
(gl_C_STRTOD): Use it instead of AC_CHECK_DECLS_ONCE(strtold).
Diffstat (limited to 'm4/c-strtod.m4')
| -rw-r--r-- | m4/c-strtod.m4 | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/m4/c-strtod.m4 b/m4/c-strtod.m4 index c212c5c9e..b343fddae 100644 --- 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 @@ AC_DEFUN([gl_C_STRTOLD], [ dnl Prerequisites of lib/c-strtold.c. AC_REQUIRE([gl_C_STRTOD]) - AC_CHECK_DECLS_ONCE([strtold]) + AC_REQUIRE([gl_C99_STRTOLD]) + : ]) |