Merge branch 'clang.L1CaloFEXByteStream-20220923' into 'master'

L1CaloFEXByteStream: Fix compilation with clang.

See merge request !56999

(cherry picked from commit e4f4a454)

cac64025 L1CaloFEXByteStream: Fix compilation with clang.

Trigger/TrigT1/L1CaloFEX/L1CaloFEXByteStream/src/jFexInputByteStreamTool.cxx

@@ -370,7 +370,7 @@ StatusCode jFexInputByteStreamTool::ReadfromFile(const std::string & fileName){
 }
 
 
-constexpr unsigned int jFexInputByteStreamTool::mapIndex(unsigned int jfex, unsigned int fpga, unsigned int channel, unsigned int tower) const{
+constexpr unsigned int jFexInputByteStreamTool::mapIndex(unsigned int jfex, unsigned int fpga, unsigned int channel, unsigned int tower) {
   // values from hardware: jfex=[0,5] 4 bits, fpga=[0,3] 4 bits, channel=[0,59] 8 bits, tower=[0,15] 4 bits
   return (jfex << 16) | (fpga << 12) | (channel << 4) | tower;
 }

Trigger/TrigT1/L1CaloFEX/L1CaloFEXByteStream/src/jFexInputByteStreamTool.h

@@ -71,7 +71,7 @@ class jFexInputByteStreamTool : public extends<AthAlgTool, IL1TriggerByteStreamT
         StatusCode ReadfromFile(const std::string&);
         
         // hash the index into one integer in the format 0xJFCCT (hexadecimal)
-        constexpr unsigned int mapIndex(unsigned int jfex, unsigned int fpga, unsigned int channel, unsigned int tower) const;
+        constexpr static unsigned int mapIndex(unsigned int jfex, unsigned int fpga, unsigned int channel, unsigned int tower);
         std::unordered_map<unsigned int, std::array<float,4> > m_Firm2Tower_map; /// {map index, {IDsimulation,eta,phi}}