Avoid <class ER> syntax in lambdas. Thats C++20

Author: brenoguim

src/patchelf.cc

@@ -2013,30 +2013,20 @@ void ElfFile<ElfFileParamNames>::rebuildGnuHashTable(span<char> strTab, span<Elf
     if (versyms)
         reorderSpan(versyms, old2new);
 
-    auto fixRelocationTable = [&old2new, firstSymIdx, this] <class ER> (auto& hdr)
+    auto remapSymbolId = [&old2new, firstSymIdx] (auto& oldSymIdx)
     {
-        auto rela = getSectionSpan<ER>(hdr);
-        for (auto& r : rela)
-        {
-            auto info = rdi(r.r_info);
-            auto oldSymIdx = rel_getSymId(info);
-            if (oldSymIdx >= firstSymIdx)
-            {
-                auto newSymIdx = old2new[oldSymIdx - firstSymIdx] + firstSymIdx;
-                if (newSymIdx != oldSymIdx)
-                    wri(r.r_info, rel_setSymId(info, newSymIdx));
-            }
-        }
+        return oldSymIdx >= firstSymIdx ? old2new[oldSymIdx - firstSymIdx] + firstSymIdx
+                                        : oldSymIdx;
     };
 
     for (unsigned int i = 1; i < rdi(hdr()->e_shnum); ++i)
     {
         auto& shdr = shdrs.at(i);
         auto shtype = rdi(shdr.sh_type);
         if (shtype == SHT_REL)
-            fixRelocationTable.template operator()<Elf_Rel>(shdr);
+            changeRelocTableSymIds<Elf_Rel>(shdr, remapSymbolId);
         else if (shtype == SHT_RELA)
-            fixRelocationTable.template operator()<Elf_Rela>(shdr);
+            changeRelocTableSymIds<Elf_Rela>(shdr, remapSymbolId);
     }
 
     // Update bloom filters

src/patchelf.h

@@ -169,6 +169,13 @@ class ElfFile
 
     void renameDynamicSymbols(const std::unordered_map<std::string_view, std::string>&);
 
+    void clearSymbolVersions(const std::set<std::string> & syms);
+
+    enum class ExecstackMode { print, set, clear };
+
+    void modifyExecstack(ExecstackMode op);
+
+private:
     struct GnuHashTable {
         using BloomWord = Elf_Addr;
         struct Header {
@@ -215,14 +222,20 @@ class ElfFile
         return info;
     }
 
+    template<class ElfRelType, class RemapFn>
+    void changeRelocTableSymIds(const Elf_Shdr& shdr, RemapFn&& old2newSymId)
+    {
+        static_assert(std::is_same_v<ElfRelType, Elf_Rel> || std::is_same_v<ElfRelType, Elf_Rela>);
 
-    void clearSymbolVersions(const std::set<std::string> & syms);
-
-    enum class ExecstackMode { print, set, clear };
-
-    void modifyExecstack(ExecstackMode op);
-
-private:
+        for (auto& r : getSectionSpan<ElfRelType>(shdr))
+        {
+            auto info = rdi(r.r_info);
+            auto oldSymIdx = rel_getSymId(info);
+            auto newSymIdx = old2newSymId(oldSymIdx);
+            if (newSymIdx != oldSymIdx)
+                wri(r.r_info, rel_setSymId(info, newSymIdx));
+        }
+    }
 
     /* Convert an integer in big or little endian representation (as
        specified by the ELF header) to this platform's integer