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Use -Werror=implicit-function-declaration when checking for fdatasync #53

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Use -Werror=implicit-function-declaration when checking for fdatasync #53

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6 changes: 5 additions & 1 deletion configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -76,17 +76,21 @@ AC_CHECK_FUNCS([fsync])

# A more comprehensive check that fdatasync exits
# Necessary for platforms that have fdatasync in headers but have no
# implementation
# implementation. Use -Werror=implicit-function-declaration for platforms
# that don't have fdatasync at all.
dnl Originally provided by user copiousfreetime for the beanstalkd project
dnl {{{ make sure that fdatasync exits
AC_CACHE_CHECK([for fdatasync],[ac_cv_func_fdatasync],[
saved_cflags="$CFLAGS"
CFLAGS="$CFLAGS -Werror=implicit-function-declaration"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <unistd.h>
]],[[
fdatasync(4);
]])],
[ac_cv_func_fdatasync=yes],
[ac_cv_func_fdatasync=no])
CFLAGS="$saved_cflags"
])
AS_IF([test "x${ac_cv_func_fdatasync}" = "xyes"],
[AC_DEFINE([HAVE_FDATASYNC],[1],[If the system defines fdatasync])])
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