diff options
Diffstat (limited to 'm4/fdopendir.m4')
| -rw-r--r-- | m4/fdopendir.m4 | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/m4/fdopendir.m4 b/m4/fdopendir.m4 new file mode 100644 index 0000000..9937a74 --- /dev/null +++ b/m4/fdopendir.m4 @@ -0,0 +1,67 @@ +# serial 14 +# See if we need to provide fdopendir. + +dnl Copyright (C) 2009-2020 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +# Written by Eric Blake. + +AC_DEFUN([gl_FUNC_FDOPENDIR], +[ + AC_REQUIRE([gl_DIRENT_H_DEFAULTS]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles + + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + + dnl FreeBSD 7.3 has the function, but failed to declare it. + AC_CHECK_DECLS([fdopendir], [], [HAVE_DECL_FDOPENDIR=0], [[ +#include <dirent.h> + ]]) + AC_CHECK_FUNCS_ONCE([fdopendir]) + if test $ac_cv_func_fdopendir = no; then + HAVE_FDOPENDIR=0 + else + AC_CACHE_CHECK([whether fdopendir works], + [gl_cv_func_fdopendir_works], + [AC_RUN_IFELSE( + [AC_LANG_PROGRAM([[ +#include <dirent.h> +#include <fcntl.h> +#include <unistd.h> +]GL_MDA_DEFINES[ +#if !HAVE_DECL_FDOPENDIR +extern +# ifdef __cplusplus +"C" +# endif +DIR *fdopendir (int); +#endif +]], + [[int result = 0; + int fd = open ("conftest.c", O_RDONLY); + if (fd < 0) result |= 1; + if (fdopendir (fd)) result |= 2; + if (close (fd)) result |= 4; + return result; + ]])], + [gl_cv_func_fdopendir_works=yes], + [gl_cv_func_fdopendir_works=no], + [case "$host_os" in + # Guess yes on glibc systems. + *-gnu*) gl_cv_func_fdopendir_works="guessing yes" ;; + # Guess yes on musl systems. + *-musl*) gl_cv_func_fdopendir_works="guessing yes" ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_fdopendir_works="$gl_cross_guess_normal" ;; + esac + ])]) + case "$gl_cv_func_fdopendir_works" in + *yes) ;; + *) + REPLACE_FDOPENDIR=1 + ;; + esac + fi +]) |