configure: Poison all current target-specific #defines

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

@@ -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

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
+
 # Save the configure command line for later reuse.
 cat <<EOD >config.status
 #!/bin/sh

include/exec/poison.h

@@ -4,6 +4,8 @@
 #ifndef HW_POISON_H
 #define HW_POISON_H
 
+#include "config-poison.h"
+
 #pragma GCC poison TARGET_I386
 #pragma GCC poison TARGET_X86_64
 #pragma GCC poison TARGET_AARCH64