Configure: added option to configure position independent code flag.

Author: xeioex

auto/help

@@ -16,6 +16,8 @@ default: "$NJS_ADDRESS_SANITIZER"
   --cc=FILE                 sets C compiler filename, default: "$CC"
   --cc-opt=OPTIONS          sets additional C compiler options, \
 default: "$NJS_CC_OPT"
+  --pic=OPTION              sets position independent code flag, \
+default: "$NJS_PIC"
   --debug=YES               enables additional runtime checks, \
 default: "$NJS_DEBUG"
   --debug-memory=YES        enables memory alloc debug, \

auto/make

@@ -89,6 +89,7 @@ cat << END > $NJS_MAKEFILE
 NJS_CC = ${CC}
 NJS_STATIC_LINK = ${AR} -r -c
 NJS_LINK = ${CC} ${NJS_LD_OPT}
+NJS_PIC = ${NJS_PIC}
 NJS_CFLAGS = ${NJS_CFLAGS} ${NJS_CC_OPT} ${CFLAGS}
 NJS_LIB_AUX_CFLAGS = ${NJS_LIB_AUX_CFLAGS}
 
@@ -132,7 +133,7 @@ do
     cat << END >> $NJS_MAKEFILE
 
 $NJS_BUILD_DIR/$njs_obj: $njs_src
-	\$(NJS_CC) -c \$(NJS_LIB_INCS) \$(NJS_CFLAGS) \\
+	\$(NJS_CC) -c \$(NJS_LIB_INCS) \$(NJS_PIC) \$(NJS_CFLAGS) \\
 		\$(NJS_LIB_AUX_CFLAGS) \\
 		-o $NJS_BUILD_DIR/$njs_obj \\
 		$njs_dep_flags \\
@@ -154,7 +155,7 @@ do
     cat << END >> $NJS_MAKEFILE
 
 $NJS_BUILD_DIR/$njs_obj: $njs_src
-	\$(NJS_CC) -c \$(NJS_LIB_INCS) \$(NJS_CFLAGS) \\
+	\$(NJS_CC) -c \$(NJS_LIB_INCS) \$(NJS_PIC) \$(NJS_CFLAGS) \\
 		\$(NJS_LIB_AUX_CFLAGS) \\
 		-o $NJS_BUILD_DIR/$njs_obj \\
 		$njs_dep_flags \\

auto/options

@@ -5,6 +5,7 @@
 
 NJS_CC_OPT=${NJS_CC_OPT:--O}
 NJS_LD_OPT=${NJS_CC_OPT:--O}
+NJS_PIC=-fPIC
 
 NJS_DEBUG=NO
 NJS_DEBUG_MEMORY=NO
@@ -40,6 +41,8 @@ do
         --ld-opt=*)                      NJS_LD_OPT="$value"                 ;;
         --ar=*)                          AR="$value"                         ;;
 
+        --pic=*)                         NJS_PIC="$value"                    ;;
+
         --build-dir=*)                   NJS_BUILD_DIR="$value"              ;;
 
         --address-sanitizer=*)           NJS_ADDRESS_SANITIZER="$value"      ;;