Gcc12 related fixes (#1138)

* GCC12 related fixes but still compiles on GCC9

* Suppress warnings about volatile +=

* Enable c++20 if supported by the compiler

On gcc12 we need to use -std=c++20 since constexpr .c_str() on std::string is only officially available since c++20 and the new gcc wouldnt let us use it with older standard

* code format

---------

Co-authored-by: Eisenberger Tamas <e.tamas@iwstudio.hu>

firmware/application/CMakeLists.txt

@@ -27,6 +27,8 @@
 
 enable_language(C CXX ASM)
 
+include(CheckCXXCompilerFlag)
+
 project(application)
 
 # Compiler options here.
@@ -36,7 +38,13 @@ set(USE_OPT "-Os -g --specs=nano.specs")
 set(USE_COPT "-std=gnu99")
 
 # C++ specific options here (added to USE_OPT).
-set(USE_CPPOPT "-std=c++17 -fno-rtti -fno-exceptions -Weffc++ -Wuninitialized")
+check_cxx_compiler_flag("-std=c++20" cpp20_supported)
+if(cpp20_supported)
+	set(USE_CPPOPT "-std=c++20")
+else()
+	set(USE_CPPOPT "-std=c++17")
+endif()
+set(USE_CPPOPT "${USE_CPPOPT} -fno-rtti -fno-exceptions -Weffc++ -Wuninitialized -Wno-volatile")
 
 # Enable this if you want the linker to remove unused code and data
 set(USE_LINK_GC yes)

firmware/application/apps/tpms_app.hpp

@@ -38,10 +38,6 @@
 
 namespace std {
 
-constexpr bool operator==(const tpms::TransponderID& lhs, const tpms::TransponderID& rhs) {
-    return (lhs.value() == rhs.value());
-}
-
 } /* namespace std */
 
 struct TPMSRecentEntry {

firmware/application/hw/max283x.hpp

@@ -22,6 +22,8 @@
 #ifndef __MAX283X_H__
 #define __MAX283X_H__
 
+#include <array>
+
 #include "rf_path.hpp"
 
 namespace max283x {

firmware/application/rf_path.cpp

@@ -162,8 +162,8 @@ constexpr ConfigAmp config_amp(
     const Direction direction,
     const Band band) {
     return {{
-        {.direction = direction, .band = band, .amplify = false},
-        {.direction = direction, .band = band, .amplify = true},
+        Config(direction, band, false),
+        Config(direction, band, true),
     }};
 }
 

firmware/application/ui/ui_geomap.cpp

@@ -136,7 +136,7 @@ GeoMap::GeoMap(
 }
 
 void GeoMap::paint(Painter& painter) {
-    u_int16_t line;
+    uint16_t line;
     std::array<ui::Color, 240> map_line_buffer;
     const auto r = screen_rect();