exec: Remove accel/tcg/ from include paths

When TCG is enabled, the accel/tcg/ include path is added to the
project global include search list. This accel/tcg/ directory
contains a header named "internal.h" which, while intented to
be internal to accel/tcg/, is accessible by all files compiled
when TCG is enabled. This might lead to problem with other
directories using the same "internal.h" header name:

  $ git ls-files | fgrep /internal.h
  accel/tcg/internal.h
  include/hw/ide/internal.h
  target/hexagon/internal.h
  target/mips/internal.h
  target/ppc/internal.h
  target/s390x/internal.h

As we don't need to expose accel/tcg/ internals to the rest of
the code base, simplify by removing it from the include search
list, and include the accel/tcg/ public headers relative to the
project root search path (which is already in the generic include
search path).

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Claudio Fontana <cfontana@suse.de>
Message-Id: <20210413081008.3409459-1-f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

include/exec/helper-gen.h

@@ -81,8 +81,8 @@ static inline void glue(gen_helper_, name)(dh_retvar_decl(ret)          \
 #include "helper.h"
 #include "trace/generated-helpers.h"
 #include "trace/generated-helpers-wrappers.h"
-#include "tcg-runtime.h"
-#include "plugin-helpers.h"
+#include "accel/tcg/tcg-runtime.h"
+#include "accel/tcg/plugin-helpers.h"
 
 #undef DEF_HELPER_FLAGS_0
 #undef DEF_HELPER_FLAGS_1

include/exec/helper-proto.h

@@ -39,8 +39,8 @@ dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2), dh_ctype(t3), \
 
 #include "helper.h"
 #include "trace/generated-helpers.h"
-#include "tcg-runtime.h"
-#include "plugin-helpers.h"
+#include "accel/tcg/tcg-runtime.h"
+#include "accel/tcg/plugin-helpers.h"
 
 #undef IN_HELPER_PROTO
 

include/exec/helper-tcg.h

@@ -60,8 +60,8 @@
 
 #include "helper.h"
 #include "trace/generated-helpers.h"
-#include "tcg-runtime.h"
-#include "plugin-helpers.h"
+#include "accel/tcg/tcg-runtime.h"
+#include "accel/tcg/plugin-helpers.h"
 
 #undef str
 #undef DEF_HELPER_FLAGS_0

meson.build

@@ -258,7 +258,6 @@ if not get_option('tcg').disabled()
     tcg_arch = 'riscv'
   endif
   add_project_arguments('-iquote', meson.current_source_dir() / 'tcg' / tcg_arch,
-                        '-iquote', meson.current_source_dir() / 'accel/tcg',
                         language: ['c', 'cpp', 'objc'])
 
   accelerators += 'CONFIG_TCG'