[PATCH/RFC V2 20/26] buildsys: Allow overriding -W flags

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For any given source file, automake will apply either
"$(AM_CFLAGS) $(CFLAGS)" or "$(objname_CFLAGS) $(CFLAGS)" [1].  Move the
warning flags into the former item so that they can be disabled on a per-
object basis.

[1] http://www.gnu.org/software/automake/manual/automake.html#Flag-Variables-Ordering

Signed-off-by: Kevin Cernekee <cernekee at gmail.com>
---
 Makefile.am  |    7 ++++---
 configure.ac |    3 ++-
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index dcf720b..2cab5d1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -11,10 +11,11 @@ lib_LTLIBRARIES = libopenconnect.la
 sbin_PROGRAMS = openconnect
 man8_MANS = openconnect.8
 
+AM_CFLAGS = @WFLAGS@
 AM_CPPFLAGS = -DLOCALEDIR="\"$(localedir)\""
-openconnect_SOURCES = xml.c main.c
 
-openconnect_CFLAGS = $(SSL_CFLAGS) $(DTLS_SSL_CFLAGS) $(LIBXML2_CFLAGS) $(LIBPROXY_CFLAGS) $(ZLIB_CFLAGS) $(LIBSTOKEN_CFLAGS) $(LIBOATH_CFLAGS)
+openconnect_SOURCES = xml.c main.c
+openconnect_CFLAGS = $(AM_CFLAGS) $(SSL_CFLAGS) $(DTLS_SSL_CFLAGS) $(LIBXML2_CFLAGS) $(LIBPROXY_CFLAGS) $(ZLIB_CFLAGS) $(LIBSTOKEN_CFLAGS) $(LIBOATH_CFLAGS)
 openconnect_LDADD = libopenconnect.la $(LIBXML2_LIBS) $(LIBPROXY_LIBS) $(LIBINTL)
 
 library_srcs = ssl.c http.c auth.c library.c compat.c dtls.c cstp.c mainloop.c tun.c
@@ -30,7 +31,7 @@ if OPENCONNECT_OPENSSL
 library_srcs += $(lib_srcs_openssl)
 endif
 libopenconnect_la_SOURCES = version.c $(library_srcs)
-libopenconnect_la_CFLAGS = $(SSL_CFLAGS) $(DTLS_SSL_CFLAGS) $(LIBXML2_CFLAGS) $(LIBPROXY_CFLAGS) $(ZLIB_CFLAGS) $(P11KIT_CFLAGS) $(TSS_CFLAGS) $(LIBSTOKEN_CFLAGS) $(LIBOATH_CFLAGS)
+libopenconnect_la_CFLAGS = $(AM_CFLAGS) $(SSL_CFLAGS) $(DTLS_SSL_CFLAGS) $(LIBXML2_CFLAGS) $(LIBPROXY_CFLAGS) $(ZLIB_CFLAGS) $(P11KIT_CFLAGS) $(TSS_CFLAGS) $(LIBSTOKEN_CFLAGS) $(LIBOATH_CFLAGS)
 libopenconnect_la_LIBADD = $(SSL_LIBS) $(DTLS_SSL_LIBS) $(LIBXML2_LIBS) $(LIBPROXY_LIBS) $(ZLIB_LIBS) $(LIBINTL) $(P11KIT_LIBS) $(TSS_LIBS) $(LIBSTOKEN_LIBS) $(LIBOATH_LIBS)
 if OPENBSD_LIBTOOL
 # OpenBSD's libtool doesn't have -version-number, but its -version-info arg
diff --git a/configure.ac b/configure.ac
index 934488b..e1c22ba 100644
--- a/configure.ac
+++ b/configure.ac
@@ -122,7 +122,7 @@ AC_SUBST(SYMVER_TIME, $symver_time)
 AC_SUBST(SYMVER_GETLINE, $symver_getline)
 AC_SUBST(SYMVER_ASPRINTF, $symver_asprintf)
 
-AS_COMPILER_FLAGS(CFLAGS,
+AS_COMPILER_FLAGS(WFLAGS,
         "-Wall
          -Wextra
          -Wno-missing-field-initializers
@@ -139,6 +139,7 @@ AS_COMPILER_FLAGS(CFLAGS,
          -Wnested-externs
          -Wpointer-arith
          -Wwrite-strings")
+AC_SUBST(WFLAGS, [$WFLAGS])
 
 AC_CHECK_FUNC(socket, [], AC_CHECK_LIB(socket, socket, [], AC_ERROR(Cannot find socket() function)))
 AC_CHECK_FUNC(inet_aton, [], AC_CHECK_LIB(nsl, inet_aton, [], AC_ERROR(Cannot find inet_aton() function)))
-- 
1.7.9.5




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