The attached small configury patch replaces -Wextra with -W in the main CFLAGS and CXXFLAGS assignments. A few lines after them, -Wextra is conditionally added already with XIPH_ADD_CFLAGS([-Wextra]), so this allows build using older compilers.
Regards. -- O.S.
diff --git a/configure.ac b/configure.ac index 6d0fa00..cc5a247 100644 --- a/configure.ac +++ b/configure.ac @@ -392,8 +392,8 @@ fi XIPH_GCC_VERSION if test x$ac_cv_c_compiler_gnu = xyes ; then - CFLAGS="$CFLAGS -Wall -Wextra -Wstrict-prototypes -Wmissing-prototypes -Waggregate-return -Wcast-align -Wnested-externs -Wshadow -Wundef -Wmissing-declarations -Wunreachable-code " # -Wcast-qual -Wbad-function-cast -Wwrite-strings -Winline -Wconversion - CXXFLAGS="$CXXFLAGS -Wall -Wextra -Wcast-align -Wshadow -Wwrite-strings -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Wsign-promo -Wundef -Wunreachable-code " # -Wcast-qual -Wbad-function-cast -Wwrite-strings -Woverloaded-virtual -Wmissing-declarations + CFLAGS="$CFLAGS -Wall -W -Wstrict-prototypes -Wmissing-prototypes -Waggregate-return -Wcast-align -Wnested-externs -Wshadow -Wundef -Wmissing-declarations -Wunreachable-code " # -Wcast-qual -Wbad-function-cast -Wwrite-strings -Winline -Wconversion + CXXFLAGS="$CXXFLAGS -Wall -W -Wcast-align -Wshadow -Wwrite-strings -Wctor-dtor-privacy -Wnon-virtual-dtor -Wreorder -Wsign-promo -Wundef -Wunreachable-code " # -Wcast-qual -Wbad-function-cast -Wwrite-strings -Woverloaded-virtual -Wmissing-declarations XIPH_ADD_CFLAGS([-Wdeclaration-after-statement])
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