configure: Use -Wno-maybe-uninitialized iff compiler supports it

clang does not support the flag.

Reviewed-by: Sam James <sam@gentoo.org>

diff --git a/configure b/configure
index 25413727e3928fddaf86f7c6b8947a2c2b12ee18..789f68da757017cc22ea90a1f1b99ddb46ce8706 100755 (executable)
--- a/configure
+++ b/configure
@@ -7613,6 +7613,32 @@ config_vars="$config_vars
 config-cflags-wno-ignored-attributes = $libc_cv_wno_ignored_attributes"
 
 
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for -Wno-maybe-uninitialized" >&5
+printf %s "checking for -Wno-maybe-uninitialized... " >&6; }
+if test ${libc_cv_wno_maybe_uninitialized+y}
+then :
+  printf %s "(cached) " >&6
+else case e in #(
+  e)           if { ac_try='${CC-cc} -Werror -Wno-maybe-uninitialized -xc /dev/null -S -o /dev/null'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+then :
+  libc_cv_wno_maybe_uninitialized=-Wno-maybe-uninitialized
+else case e in #(
+  e) libc_cv_wno_maybe_uninitialized= ;;
+esac
+fi
+ ;;
+esac
+fi
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_wno_maybe_uninitialized" >&5
+printf "%s\n" "$libc_cv_wno_maybe_uninitialized" >&6; }
+config_vars="$config_vars
+config-cflags-wno-maybe-uninitialized = $libc_cv_wno_maybe_uninitialized"
+
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether cc puts quotes around section names" >&5
 printf %s "checking whether cc puts quotes around section names... " >&6; }
 if test ${libc_cv_have_section_quotes+y}

diff --git a/configure.ac b/configure.ac
index 78b6c70b4c94c5346b5b491645d4fef8588abb01..aa4641edaec963770581f91acdd5f4054fa901c9 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1444,6 +1444,15 @@ LIBC_CONFIG_VAR([config-cflags-wno-ignored-attributes],
                [$libc_cv_wno_ignored_attributes])
 AC_SUBST(libc_cv_test_wno_ignored_attributes)
 
+AC_CACHE_CHECK([for -Wno-maybe-uninitialized],
+                libc_cv_wno_maybe_uninitialized, [dnl
+               LIBC_TRY_CC_OPTION([-Werror -Wno-maybe-uninitialized],
+                                  [libc_cv_wno_maybe_uninitialized=-Wno-maybe-uninitialized],
+                                  [libc_cv_wno_maybe_uninitialized=])
+])
+LIBC_CONFIG_VAR([config-cflags-wno-maybe-uninitialized],
+               [$libc_cv_wno_maybe_uninitialized])
+
 AC_CACHE_CHECK(whether cc puts quotes around section names,
               libc_cv_have_section_quotes,
               [cat > conftest.c <<EOF

diff --git a/timezone/Makefile b/timezone/Makefile
index ebe5cf73a11c68f1206474afbb490786fecd6e8f..6c7a7d4f4d4a4f8f29d1e4bf61e6c24f3f5183e1 100644 (file)
--- a/timezone/Makefile
+++ b/timezone/Makefile
@@ -68,7 +68,7 @@ tz-cflags = -DTZDIR='"$(zonedir)"' \
            -DTZDEFRULES='"$(posixrules-file)"' \
            -DTM_GMTOFF=tm_gmtoff -DTM_ZONE=tm_zone \
            -DHAVE_GETTEXT -DUSE_LTZ=0 -D_ISOMAC -DTZ_DOMAIN='"libc"' \
-           -include $(common-objpfx)config.h -Wno-maybe-uninitialized
+           -include $(common-objpfx)config.h $(config-cflags-wno-maybe-uninitialized)
 
 # The -Wno-unused-variable flag is used to prevent GCC 6
 # from warning about time_t_min and time_t_max which are