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Small backport(ish) of https://sourceware.org/git/?p=valgrind.git;a=commit;h=51c5973d9d1f096b9472df75638f2a53324fafed
--- a/configure.ac
+++ b/configure.ac
@@ -2591,7 +2591,7 @@ AC_GCC_WARNING_SUBST_NO([unused-result], [FLAG_W_NO_UNUSED_RESULT])
AC_GCC_WARNING_SUBST_NO([infinite-recursion], [FLAG_W_NO_INFINITE_RECURSION])
AC_GCC_WARNING_SUBST_NO([deprecated], [FLAG_W_NO_DEPRECATED])
# OK for 32 and 64 bit
-AC_GCC_WARNING_SUBST_NO([alloc-size-larger-than=18446744073709551615], [FLAG_W_NO_ALLOC_SIZE_LARGER_THAN])
+AC_GCC_WARNING_SUBST([alloc-size-larger-than=18446744073709551616], [FLAG_W_NO_ALLOC_SIZE_LARGER_THAN])
AC_GCC_WARNING_SUBST_NO([alloc-size], [FLAG_W_NO_ALLOC_SIZE])
AC_GCC_WARNING_SUBST([write-strings], [FLAG_W_WRITE_STRINGS])
@@ -2610,7 +2610,7 @@ AC_GCC_WARNING_SUBST([implicit-fallthrough=2], [FLAG_W_IMPLICIT_FALLTHROUGH])
AC_DEFUN([AC_GXX_WARNING_SUBST_NO],[
AC_MSG_CHECKING([if g++ accepts -W$1])
safe_CXXFLAGS=$CXXFLAGS
- CXXFLAGS="-W$1 -Werror"
+ CXXFLAGS="-W$1 -Wno-$1 -Werror"
AC_LANG_PUSH(C++)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[;]])], [
AC_SUBST([$2], [-Wno-$1])
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