try to preserve as much as possible CFLAGS and LDFLAGS from env

but still try to autodetect with pkg-config if they aren't provided.

Passing CFLAGS/LDFLAGS from the command line will still override the
guessed ones.

1 files changed, 36 insertions, 11 deletions

diff --git a/configure b/configure
index b201655..2cfcff2 100755
--- a/configure
+++ b/configure
@@ -32,13 +32,25 @@ echo "file config.log: writing..."
 
 # --------
 # default settings: initialize all vars here such that nothing is
-# leaked from the environment except for CC and CFLAGS
+# leaked from the environment except for CC, CFLAGS and LDFLAGS
 
 CC=`printf "all:\\n\\t@echo \\\$(CC)\\n" | make ${MAKE_FLAGS} -sf -`
-CFLAGS=`printf "all:\\n\\t@echo \\\$(CFLAGS)\\n" | make ${MAKE_FLAGS} -sf -`
-CFLAGS="${CFLAGS} -g -W -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes"
-CFLAGS="${CFLAGS} -Wwrite-strings -Wno-unused-parameter"
-LDFLAGS="-ltls -levent"
+
+guessing_cflags=0
+if [ -z "${CFLAGS}" ]; then
+	guessing_cflags=1
+	CFLAGS=`printf "all:\\n\\t@echo \\\$(CFLAGS)\\n" | make ${MAKE_FLAGS} -sf -`
+	CFLAGS="${CFLAGS} -W -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes"
+	CFLAGS="${CFLAGS} -Wwrite-strings -Wno-unused-parameter"
+fi
+
+guessing_ldflags=0
+if [ -z "${LDFLAGS}" ]; then
+	guessing_ldflags=1
+	LDFLAGS=`printf "all:\\n\\t@echo \\\$(LDFLAGS)\\n" | make ${MAKE_FLAGS} -sf -`
+	LDFLAGS="-ltls -levent -lcrypto"
+fi
+
 LD_IMSG=
 STATIC=
 YACC=yacc
@@ -53,15 +65,28 @@ BINDIR=
 
 INSTALL="install"
 
+add_cflags() {
+	if [ $guessing_cflags = 1 ]; then
+		CFLAGS="${CFLAGS} $1"
+	fi
+}
+
+add_ldflags() {
+	if [ $guessing_ldflags = 1 ]; then
+		LDFLAGS="${LDFLAGS} $1"
+	fi
+}
+
 # try to auto detect CFLAGS and LDFLAGS
 if which pkg-config 2>/dev/null 1>&2; then
 	if pkg-config libtls; then
-		CFLAGS="${CFLAGS} $(pkg-config --cflags libtls)"
-		LDFLAGS="$(pkg-config --libs libtls)"
+		add_cflags "$(pkg-config --cflags libtls)"
+		add_ldflags "$(pkg-config --libs libtls)"
 	fi
+
 	if pkg-config openssl; then
-		CFLAGS="${CFLAGS} $(pkg-config --cflags openssl)"
-		LDFLAGS="${LDFLAGS} $(pkg-config --libs openssl)"
+		add_cflags "$(pkg-config --cflags openssl)"
+		add_ldflags "$(pkg-config --libs openssl)"
 	fi
 
 	case "$(uname)" in
@@ -70,8 +95,8 @@ if which pkg-config 2>/dev/null 1>&2; then
 			;;
 		*)
 			if pkg-config libevent; then
-				CFLAGS="${CFLAGS} $(pkg-config --cflags libevent)"
-				LDFLAGS="${LDFLAGS} $(pkg-config --libs libevent)"
+				add_cflags "$(pkg-config --cflags libevent)"
+				add_ldflags "$(pkg-config --libs libevent)"
 			fi
 			;;
 	esac