[RFA] Fix CPPFLAGS handling in gdbserver's build.

[Joel Brobecker <brobecker@adacore.com>]

Hello,

Something I happen to notice in passing...

In gdb/gdbserver/Makefile.in, IPAGENT_CFLAGS is defined using
an expression which references $(CPPFLAGS). But CPPFLAGS isn't
actually defined.

This patch first adds a CPPFLAGS definition, so as to inherit
the value passed at configure time (if any). And it then makes it
part of INTERNAL_CFLAGS_BASE, instead. There is no reason that
CPPFLAGS be useful for a certain class of source files, and not
the rest. This is also consistent with what's done in GDB.

gdb/gdbserver/ChangeLog:

        * Makefile.in (CPPFLAGS): Define.
        (INTERNAL_CFLAGS_BASE): Add ${CPPFLAGS}.
        (IPAGENT_CFLAGS): Remove ${CPPFLAGS}.

Tested by rebuilding GDBserver with a dummy CPPFLAGS, and verifying
that the compilation command was altered as expected.

OK to apply?

Thanks,
-- 
Joel

---
 gdb/gdbserver/Makefile.in | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gdb/gdbserver/Makefile.in b/gdb/gdbserver/Makefile.in
index 074d93d..e9d6b15 100644
--- a/gdb/gdbserver/Makefile.in
+++ b/gdb/gdbserver/Makefile.in
@@ -128,10 +128,11 @@ WARN_CFLAGS_NO_FORMAT = `echo " $(WARN_CFLAGS) " \
 # CFLAGS is specifically reserved for setting from the command line
 # when running make.  I.E.  "make CFLAGS=-Wmissing-prototypes".
 CFLAGS = @CFLAGS@
+CPPFLAGS = @CPPFLAGS@
 
 # INTERNAL_CFLAGS is the aggregate of all other *CFLAGS macros.
 INTERNAL_CFLAGS_BASE =  ${CFLAGS} ${GLOBAL_CFLAGS} \
-	${PROFILE_CFLAGS} ${INCLUDE_CFLAGS}
+	${PROFILE_CFLAGS} ${INCLUDE_CFLAGS} ${CPPFLAGS}
 INTERNAL_WARN_CFLAGS =  ${INTERNAL_CFLAGS_BASE} $(WARN_CFLAGS)
 INTERNAL_CFLAGS =  ${INTERNAL_WARN_CFLAGS} $(WERROR_CFLAGS) -DGDBSERVER
 
@@ -447,7 +448,7 @@ UST_CFLAGS = $(ustinc) -DCONFIG_UST_GDB_INTEGRATION
 
 # Note, we only build the IPA if -fvisibility=hidden is supported in
 # the first place.
-IPAGENT_CFLAGS = $(CPPFLAGS) $(INTERNAL_CFLAGS) $(UST_CFLAGS) \
+IPAGENT_CFLAGS = $(INTERNAL_CFLAGS) $(UST_CFLAGS) \
 	-fPIC -DIN_PROCESS_AGENT \
 	-fvisibility=hidden
 
-- 
1.9.1