build: turn off -Wlong-long

* configure.ac: With --enable-gcc-warnings, -Wlong-long would
cause compilation failure due to inclusion of lib/gethrxtime.h.
Initialize "nw".

diff --git a/configure.ac b/configure.ac
index 8b05b11..b738d4a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -60,9 +60,11 @@ if test "$gl_gcc_warnings" = yes; then
   gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
   AC_SUBST([WERROR_CFLAGS])
 
-  # Add many warnings, except some...
+  nw=
+  # This, $nw, is the list of warnings we disable.
   nw="$nw -Wdeclaration-after-statement" # too useful to forbid
   nw="$nw -Waggregate-return"       # anachronistic
+  nw="$nw -Wlong-long"              # C90 is anachronistic (lib/gethrxtime.h)
   nw="$nw -Wc++-compat"             # We don't care about C++ compilers
   nw="$nw -Wundef"                  # Warns on '#if GNULIB_FOO' etc in gnulib
   nw="$nw -Wtraditional"            # Warns on #elif which we use often