diff --git a/build_scripts/build_lib.sh b/build_scripts/build_lib.sh
index 45bb44b..2df2616 100644
--- a/build_scripts/build_lib.sh
+++ b/build_scripts/build_lib.sh
@@ -5,6 +5,6 @@ source build_scripts/init.sh
 print "${CYAN}=============[build_lib]==============\n"
 clear_dir bin
 clear_dir obj
-compile_c "-O2 -fpic -shared" "$SRC_C tests/test_marshalling.c"
-compile_cpp "-O2 -fpic -shared" "$SRC_CPP"
-link "-shared -O2 -fpic -flto -Wl,-soname,$LIB_FILE" "$LIB_FILE"
+compile_c "$BUILD_LIB_C_ARGS" "$SRC_C tests/test_marshalling.c"
+compile_cpp "$BUILD_LIB_C_ARGS" "$SRC_CPP"
+link "$BUILD_LIB_CPP_ARGS $BUILD_LIB_LINKER_ARGS" "$LIB_FILE"
diff --git a/build_scripts/build_test.sh b/build_scripts/build_test.sh
index 26bc10f..5ff01e8 100644
--- a/build_scripts/build_test.sh
+++ b/build_scripts/build_test.sh
@@ -5,6 +5,6 @@ source build_scripts/init.sh
 print "${CYAN}=============[build_test]=============\n"
 clear_dir bin
 clear_dir obj
-compile_c "-O0 -g" "$SRC_C $TESTS_C"
-compile_cpp "-O0 -g" "$SRC_CPP $TESTS_CPP"
-link " " $TEST_FILE
+compile_c "$BUILD_TEST_C_ARGS" "$SRC_C $TESTS_C"
+compile_cpp "$BUILD_TEST_CPP_ARGS" "$SRC_CPP $TESTS_CPP"
+link "$BUILD_TEST_CPP_ARGS $BUILD_TEST_LINKER_ARGS" $TEST_FILE
diff --git a/build_scripts/default.config.sh b/build_scripts/default.config.sh
index 740a22e..819273a 100644
--- a/build_scripts/default.config.sh
+++ b/build_scripts/default.config.sh
@@ -2,18 +2,26 @@
 
 OUTDIR=bin
 OBJDIR=obj
-TEST_FILE=kerep.com
-LIB_FILE=kerep.so
-DLL_FILE=kerep.dll
 CMP_C=gcc
 CMP_CPP=g++
 STD_C=c11
 STD_CPP=c++17
 WARN_C="-Wall -Wno-discarded-qualifiers" #-Wextra
-WARN_CPP="-Wall -Wconversion-null -Wno-unused-variable -Wno-return-type" #-Wextra
+WARN_CPP="-Wall -Wno-unused-variable -Wno-return-type" #-Wextra
 SRC_C="$(    find src -name *.c)"
 SRC_CPP="$(  find src -name *.cpp)"
 TESTS_C="$(  find tests -name *.c)"
 TESTS_CPP="$(find tests -name *.cpp)"
-VALGRIND_ARGS=-s --read-var-info=yes --track-origins=yes --fullpath-after=kerep/ \
-	--leak-check=full --show-leak-kinds=all
+VALGRIND_ARGS=-s --read-var-info=yes --track-origins=yes --fullpath-after=kerep/ --leak-check=full --show-leak-kinds=all
+
+# build_lib
+LIB_FILE=kerep.so
+BUILD_LIB_C_ARGS="-O2 -fpic -shared"
+BUILD_LIB_CPP_ARGS="$BUILD_LIB_CPP_ARGS"
+BUILD_LIB_LINKER_ARGS="-flto -Wl,-soname,$LIB_FILE"
+
+# build_test
+TEST_FILE=kerep.com
+BUILD_TEST_C_ARGS="-O0 -g"
+BUILD_TEST_CPP_ARGS="$BUILD_TEST_CPP_ARGS"
+BUILD_TEST_LINKER_ARGS=""
diff --git a/build_scripts/functions.sh b/build_scripts/functions.sh
index 15939de..f7a23ca 100644
--- a/build_scripts/functions.sh
+++ b/build_scripts/functions.sh
@@ -21,6 +21,7 @@ function compile {
     print "${BLUE}args: ${GRAY}$args\n"
     local sources=$5
     print "${BLUE}sources: ${GRAY}$sources\n"
+    local error=0
 	for srcfile in $sources
     do
         local object="$OBJDIR/$(basename $srcfile).o"
@@ -28,9 +29,14 @@ function compile {
         if ! $($cmp -std=$std $warn $args -c -o $object $srcfile) 
         then
             print "${RED}some error happened\n"
-            exit 1
+            error=1
         fi
     done
+
+    if [ $error != 0 ]
+    then
+        exit 1
+    fi
 }
 
 # (args, sources)
@@ -54,7 +60,7 @@ function link {
     print "${BLUE}outfile: ${GRAY}$outfile\n"
     local objects="$(find $OBJDIR -name *.o)"
     print "${BLUE}objects: ${GRAY}$objects\n"
-    if $CMP_C $args -o $outfile $(echo $objects | tr '\n' ' ')
+    if $CMP_CPP $args -o $outfile $(echo $objects | tr '\n' ' ')
     then 
         print "${GREEN}file $CYAN$outfile ${GREEN}created\n"
         rm -rf $OBJDIR