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Add configure option to warn on NULL/0 usage

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This will help us migrate from checking for NULL to checking for NULLPTR.
Enable this at configuration time with:

    ./configure --enable-null-warnings
This commit is contained in:
chromatic 2025-03-01 09:54:51 -08:00
parent 2b3c999772
commit da223ce563
1 changed files with 15 additions and 0 deletions
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15
configure.ac
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@ -69,6 +69,12 @@ AC_ARG_ENABLE([c++17],
[use_cxx17=$enableval],
[use_cxx17=no])
AC_ARG_ENABLE([null-warnings],
[AS_HELP_STRING([--enable-null-warnings],
[warn about using NULL instead of nullptr (default is no)])],
[use_null_warnings=$enableval],
[use_null_warnings=no])
dnl Require either of C++ 17, 14 or 11 (default) compiler (no GNU extensions)
if test "x$use_cxx17" = xyes; then
if test "x$use_cxx14" = xyes; then
@ -290,6 +296,14 @@ if test "x$CXXFLAGS_overridden" = "xno"; then
AX_CHECK_COMPILE_FLAG([-Wunused-local-typedef],[CXXFLAGS="$CXXFLAGS -Wno-unused-local-typedef"],,[[$CXXFLAG_WERROR]])
AX_CHECK_COMPILE_FLAG([-Wdeprecated-register],[CXXFLAGS="$CXXFLAGS -Wno-deprecated-register"],,[[$CXXFLAG_WERROR]])
fi
if test "x$use_null_warnings" = "xyes"; then
AX_CHECK_COMPILE_FLAG([-Wzero-as-null-pointer-constant],
[CXXFLAGS="$CXXFLAGS -Wzero-as-null-pointer-constant"],
[AC_MSG_WARN([Compiler doesn't support -Wzero-as-null-pointer-constant])],
[[$CXXFLAG_WERROR]])
fi
CPPFLAGS="$CPPFLAGS -DHAVE_BUILD_INFO -D__STDC_FORMAT_MACROS"
AC_ARG_WITH([utils],
@ -1295,6 +1309,7 @@ echo " with bench = $use_bench"
echo " with upnp = $use_upnp"
echo " debug enabled = $enable_debug"
echo " werror = $enable_werror"
echo " null warnings = $use_null_warnings"
echo
echo " experimental = $allow_experimental"
if test x$allow_experimental = xyes; then