udp: fix locking (fixes #14234) and cancellation

[vlc] / m4 / flags.m4

diff --git a/m4/flags.m4 b/m4/flags.m4
index 2db4febba226b5811f873f26496487c78a11d4e3..7dc19b7b64478f2893e6b497f33b2931de3108fb 100644 (file)
--- a/m4/flags.m4
+++ b/m4/flags.m4
@@ -13,7 +13,7 @@ AC_DEFUN([RDC_PROG_CC_FLAGS_IFELSE],
   CFLAGS_save="${CFLAGS}"
   as_ac_var=`echo "ac_cv_prog_cc_flags_$1" | $as_tr_sh`
   AC_CACHE_CHECK([if $CC accepts $1], [$as_ac_var], [
-    CFLAGS="${CFLAGS} $1"
+    CFLAGS="${CFLAGS} -Werror $1"
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
       eval "$as_ac_var=yes"
     ],[
@@ -37,6 +37,35 @@ AC_DEFUN([RDC_PROG_CC_WFLAGS],
   done
 ])
 
+AC_DEFUN([RDC_PROG_CXX_FLAGS_IFELSE],
+[AC_LANG_ASSERT(C++)
+  CXXFLAGS_save="${CXXFLAGS}"
+  as_ac_var=`echo "ac_cv_prog_cxx_flags_$1" | $as_tr_sh`
+  AC_CACHE_CHECK([if $CXX accepts $1], [$as_ac_var], [
+    CXXFLAGS="${CXXFLAGS} $1"
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
+      eval "$as_ac_var=yes"
+    ],[
+      eval "$as_ac_var=no"
+    ])
+  ])
+
+  ac_res=`eval echo '${'$as_ac_var'}'`
+  CXXFLAGS="${CXXFLAGS_save}"
+  AS_IF([test "${ac_res}" != "no"], [$2], [$3])
+])
+
+AC_DEFUN([RDC_PROG_CXX_FLAGS],
+[AC_LANG_ASSERT(C++)
+  RDC_PROG_CXX_FLAGS_IFELSE([$1], [CXXFLAGS="${CXXFLAGS} $1"])
+])
+
+AC_DEFUN([RDC_PROG_CXX_WFLAGS],
+[ for a in $1; do
+    RDC_PROG_CXX_FLAGS([-W$a])
+  done
+])
+
 AC_DEFUN([RDC_PROG_LINK_FLAGS_IFELSE],
 [AC_LANG_ASSERT(C)
   LDFLAGS_save="${LDFLAGS}"