Compatility fixes for GCC5 (#2448)

* GCC5 compat: work around inherited constructor issues

Don't use inherited constructors, forward manually instead. This
basically reverts 61f803126d.

I believe that GCC5 does not implement P0136, a C++17 change that made
inherited constructors actually usable and was backported as a DR all
the way to C++11.

* GCC5 compat: bypass std::pair construction issue

Co-authored-by: Martin Hořeňovský <martin.horenovsky@gmail.com>

src/catch2/internal/catch_reporter_spec_parser.cpp

@@ -126,7 +126,7 @@ namespace Catch {
                     return {};
                 }
 
-                auto ret = kvPairs.emplace( kv.key, kv.value );
+                auto ret = kvPairs.emplace( std::string(kv.key), std::string(kv.value) );
                 if ( !ret.second ) {
                     // Duplicated key. We might want to handle this differently,
                     // e.g. by overwriting the existing value?

src/catch2/reporters/catch_reporter_automake.hpp

@@ -8,7 +8,9 @@
 #ifndef CATCH_REPORTER_AUTOMAKE_HPP_INCLUDED
 #define CATCH_REPORTER_AUTOMAKE_HPP_INCLUDED
 
+#include <catch2/interfaces/catch_interfaces_reporter.hpp>
 #include <catch2/reporters/catch_reporter_streaming_base.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
 
 #include <string>
 
@@ -16,7 +18,11 @@ namespace Catch {
 
     class AutomakeReporter final : public StreamingReporterBase {
     public:
-        using StreamingReporterBase::StreamingReporterBase;
+        // GCC5 compat: we cannot use inherited constructor, because it
+        //              doesn't implement backport of P0136
+        AutomakeReporter(ReporterConfig&& _config):
+            StreamingReporterBase(CATCH_MOVE(_config))
+        {}
         ~AutomakeReporter() override;
 
         static std::string getDescription() {

src/catch2/reporters/catch_reporter_cumulative_base.hpp

@@ -8,7 +8,9 @@
 #ifndef CATCH_REPORTER_CUMULATIVE_BASE_HPP_INCLUDED
 #define CATCH_REPORTER_CUMULATIVE_BASE_HPP_INCLUDED
 
+#include <catch2/interfaces/catch_interfaces_reporter.hpp>
 #include <catch2/reporters/catch_reporter_common_base.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
 #include <catch2/internal/catch_unique_ptr.hpp>
 #include <catch2/internal/catch_optional.hpp>
 
@@ -88,7 +90,11 @@ namespace Catch {
         using TestCaseNode = Node<TestCaseStats, SectionNode>;
         using TestRunNode = Node<TestRunStats, TestCaseNode>;
 
-        using ReporterBase::ReporterBase;
+        // GCC5 compat: we cannot use inherited constructor, because it
+        //              doesn't implement backport of P0136
+        CumulativeReporterBase(ReporterConfig&& _config):
+            ReporterBase(CATCH_MOVE(_config))
+        {}
         ~CumulativeReporterBase() override;
 
         void benchmarkPreparing( StringRef ) override {}

src/catch2/reporters/catch_reporter_streaming_base.hpp

@@ -8,7 +8,9 @@
 #ifndef CATCH_REPORTER_STREAMING_BASE_HPP_INCLUDED
 #define CATCH_REPORTER_STREAMING_BASE_HPP_INCLUDED
 
+#include <catch2/interfaces/catch_interfaces_reporter.hpp>
 #include <catch2/reporters/catch_reporter_common_base.hpp>
+#include <catch2/internal/catch_move_and_forward.hpp>
 
 #include <vector>
 
@@ -16,7 +18,11 @@ namespace Catch {
 
     class StreamingReporterBase : public ReporterBase {
     public:
-        using ReporterBase::ReporterBase;
+        // GCC5 compat: we cannot use inherited constructor, because it
+        //              doesn't implement backport of P0136
+        StreamingReporterBase(ReporterConfig&& _config):
+            ReporterBase(CATCH_MOVE(_config))
+        {}
         ~StreamingReporterBase() override;
 
         void benchmarkPreparing( StringRef ) override {}