Seems there is already an util helper " UTIL_GET_NON_MATCHING_VALUES" . So should we do something like this (maybe with a few more unwanted -std= settings ? Seems the UTIL_GET_NON_MATCHING_VALUES so far accepts only fix strings, is that correct ?
diff --git a/make/autoconf/toolchain.m4 b/make/autoconf/toolchain.m4 index 289eec3356b..8ff95c1114c 100644 --- a/make/autoconf/toolchain.m4 +++ b/make/autoconf/toolchain.m4 @@ -389,6 +389,12 @@ AC_DEFUN_ONCE([TOOLCHAIN_POST_DETECTION], # This is necessary since AC_PROG_CC defaults CFLAGS to "-g -O2" CFLAGS="$ORG_CFLAGS" CXXFLAGS="$ORG_CXXFLAGS" + + # filter out some unwanted additions autoconf may add to CXX; we saw this on macOS with autoconf 2.72 + UTIL_GET_NON_MATCHING_VALUES(cxx_filtered, $CXX, -std=c++11 -std=gnu++11) + if test "x$cxx_filtered" != x; then + CXX="$cxx_filtered" + fi ]) Best regards, Matthias > >Btw. Is there already something at make/autoconf that does similar filtering >of unwanted flags ? >The mentioned TOOLCHAIN_POST_DETECTION seems just to reset some variables >like CXX_CFLAGS to old values , not sure if this is what we want here ? > > >>Hi Erik, I created : >> >>https://bugs.openjdk.org/browse/JDK-8323008 >>8323008: filter out any -std* flags added by autoconf from CC/CXX >>
