We are generating a lot of target-specific defines in the *-config-devices.h
and *-config-target.h files. Using them in common code is wrong and leads
to very subtle bugs since a "#ifdef CONFIG_SOMETHING" is not working there
as expected. To avoid these issues, we are already poisoning many of the
macros in include/exec/poison.h - but it's cumbersome to maintain this
list manually. Thus let's generate an additional list of poisoned macros
automatically from the current config switches - this should give us a
much better test coverage via the different CI configurations.
Note that CONFIG_TCG (which is also defined in config-host.h) and
CONFIG_USER_ONLY are special, so we have to filter these out.
Message-Id: <20210414112004.943383-5-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
Makefile | 2 +-
configure | 7 +++++++
include/exec/poison.h | 2 ++
3 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
index bcbbec71a1..4cab10a2a4 100644
--- a/Makefile
+++ b/Makefile
@@ -213,7 +213,7 @@ qemu-%.tar.bz2:
distclean: clean
-$(quiet-@)test -f build.ninja && $(NINJA) $(NINJAFLAGS) -t clean -g ||
:
- rm -f config-host.mak config-host.h*
+ rm -f config-host.mak config-host.h* config-poison.h
rm -f tests/tcg/config-*.mak
rm -f config-all-disas.mak config.status
rm -f roms/seabios/config.mak roms/vgabios/config.mak
diff --git a/configure b/configure
index f05ca143b3..0e4233fd8a 100755
--- a/configure
+++ b/configure
@@ -6473,6 +6473,13 @@ if test -n "${deprecated_features}"; then
echo " features: ${deprecated_features}"
fi
+# Create list of config switches that should be poisoned in common code...
+# but filter out CONFIG_TCG and CONFIG_USER_ONLY which are special.
+sed -n -e '/CONFIG_TCG/d' -e '/CONFIG_USER_ONLY/d' \
+ -e '/^#define / { s///; s/ .*//; s/^/#pragma GCC poison /p; }' \
+ *-config-devices.h *-config-target.h | \
+ sort -u > config-poison.h