Fix C++ flags handling (fix relocation error on Fedora 41)

Makefile.defs

@@ -177,6 +177,7 @@ ifneq ($(NOHARDENING),1)
         CFLAGS += -fcf-protection=full
       endif
       DEFCFLAGS += -fPIE
+      DEFCXXFLAGS += -fPIE
       DEFLDFLAGS += -Wl,-z,now -Wl,-z,relro -Wl,-z,noexecstack -pie
     endif
   endif

client/Makefile

@@ -472,7 +472,7 @@ endif
 
 PM3CFLAGS += -DHAVE_SNPRINTF
 
-CXXFLAGS ?= -Wall -Werror
+CXXFLAGS ?= $(DEFCXXFLAGS)
 CXXFLAGS += $(MYDEFS) $(MYCXXFLAGS) $(MYINCLUDES)
 
 PM3CXXFLAGS = $(CXXFLAGS)
@@ -483,10 +483,10 @@ ifeq ($(QT_FOUND),1)
     PM3CXXFLAGS += -DQT_NO_DEBUG
     ifeq ($(QT6_FOUND),1)
         # Qt6 is claiming for a C++17 compiler
-        PM3CXXFLAGS += -fPIC -std=c++17
+        PM3CXXFLAGS += -std=c++17
     else
         # On OSX Qt6 is claiming for a C++11 compiler (gnu++14 works too, but if nothing it fails)
-        PM3CXXFLAGS += -fPIC -std=c++11
+        PM3CXXFLAGS += -std=c++11
     endif
 endif
 

tools/cryptorf/Makefile

@@ -21,7 +21,7 @@ endif
 
 # macOS needs c++14 standard when compiling c++
 ifeq ($(platform),Darwin)
-    MYCXXFLAGS = -std=c++14
+    MYCXXFLAGS += -std=c++14
 endif
 
 ifneq (,$(findstring MINGW,$(platform)))