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Diffstat (limited to 'm4/fdatasync.m4')
| -rw-r--r-- | m4/fdatasync.m4 | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/m4/fdatasync.m4 b/m4/fdatasync.m4 new file mode 100644 index 0000000..17cf64c --- /dev/null +++ b/m4/fdatasync.m4 @@ -0,0 +1,57 @@ +# fdatasync.m4 serial 9 +dnl Copyright (C) 2008-2023 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. + +AC_DEFUN([gl_FUNC_FDATASYNC], +[ + AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_REQUIRE([AC_CANONICAL_HOST]) + + dnl Using AC_CHECK_FUNCS_ONCE would break our subsequent AC_SEARCH_LIBS + AC_CHECK_DECLS_ONCE([fdatasync]) + FDATASYNC_LIB= + AC_SUBST([FDATASYNC_LIB]) + + if test $ac_cv_have_decl_fdatasync = no; then + HAVE_DECL_FDATASYNC=0 + dnl Mac OS X 10.7 has fdatasync but does not declare it. + dnl Likewise Android with API level < 9. + gl_CHECK_FUNCS_ANDROID([fdatasync], [[#include <unistd.h>]]) + if test $ac_cv_func_fdatasync = no; then + HAVE_FDATASYNC=0 + case "$gl_cv_onwards_func_fdatasync" in + future*) REPLACE_FDATASYNC=1 ;; + esac + fi + else + case "$host_os" in + solaris*) + dnl Solaris <= 2.6 has fdatasync() in libposix4. + dnl Solaris 7..9 has it in librt. + dnl Solaris 10 sometimes has it in librt <https://bugs.gnu.org/21059>. + gl_saved_libs=$LIBS + AC_SEARCH_LIBS([fdatasync], [rt posix4], + [test "$ac_cv_search_fdatasync" = "none required" || + FDATASYNC_LIB=$ac_cv_search_fdatasync]) + LIBS=$gl_saved_libs + ;; + *) + dnl Android 4.3 does not have fdatasync but declares it, and future + dnl Android versions have it. + gl_CHECK_FUNCS_ANDROID([fdatasync], [[#include <unistd.h>]]) + if test $ac_cv_func_fdatasync = no; then + HAVE_FDATASYNC=0 + case "$gl_cv_onwards_func_fdatasync" in + future*) REPLACE_FDATASYNC=1 ;; + esac + fi + ;; + esac + fi + + dnl For backward compatibility. + LIB_FDATASYNC="$FDATASYNC_LIB" + AC_SUBST([LIB_FDATASYNC]) +]) |