Add -Wall to C flags

Author: isuruf

CMakeLists.txt

@@ -7,8 +7,7 @@ set(CMAKE_PREFIX_PATH ${SymEngine_DIR} ${CMAKE_PREFIX_PATH})
 find_package(SymEngine 0.1.0 REQUIRED CONFIG
              PATH_SUFFIXES lib/cmake/symengine CMake/)
 set(CMAKE_BUILD_TYPE ${SYMENGINE_BUILD_TYPE})
-set(CMAKE_CXX_FLAGS_RELEASE ${SYMENGINE_CXX_FLAGS_RELEASE})
-set(CMAKE_CXX_FLAGS_DEBUG ${SYMENGINE_CXX_FLAGS_DEBUG})
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")
 include_directories(${SYMENGINE_INCLUDE_DIRS})
 
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")

ext/symengine/ruby_basic.c

@@ -127,7 +127,7 @@ VALUE cbasic_neg(VALUE self){
 }
 
 VALUE cbasic_get_args(VALUE self) {
-    basic_struct *this, *iterator_basic;
+    basic_struct *this;
     CVecBasic *args = vecbasic_new();
     int size = 0;
 
@@ -149,7 +149,7 @@ VALUE cbasic_get_args(VALUE self) {
 }
 
 VALUE cbasic_free_symbols(VALUE self) {
-    basic_struct *this, *iterator_basic;
+    basic_struct *this;
     CSetBasic *symbols = setbasic_new();
     int size = 0;
 

ext/symengine/symengine_utils.c

@@ -4,7 +4,6 @@
 VALUE check_sympify(VALUE operand2, basic_struct *cbasic_operand2) {
 
     basic_struct *temp;
-    VALUE new_operand2;
     VALUE a, b;
     double f;
     const char *c;