Make slangc commandline parsing compatible with renderdoc. (#3658)

* Make slangc commandline parsing compatible with renderdoc.

* Fix tests.

source/slang/slang-options.cpp

@@ -946,8 +946,14 @@ SlangResult OptionsParser::addInputPath(char const* inPath, SourceLanguage langO
     }
 
     Stage impliedStage = Stage::Unknown;
-    SlangSourceLanguage sourceLanguage = langOverride == SourceLanguage::Unknown ? findSourceLanguageFromPath(path, impliedStage) : SlangSourceLanguage(langOverride);
-
+    SlangSourceLanguage sourceLanguage = SlangSourceLanguage(langOverride);
+    if (sourceLanguage == SLANG_SOURCE_LANGUAGE_UNKNOWN)
+    {
+        if (m_requestImpl->getLinkage()->m_optionSet.hasOption(CompilerOptionName::Language))
+            sourceLanguage = SlangSourceLanguage(m_requestImpl->getLinkage()->m_optionSet.getEnumOption<SlangSourceLanguage>(CompilerOptionName::Language));
+        else
+            sourceLanguage = findSourceLanguageFromPath(path, impliedStage);
+    }
     if (sourceLanguage == SLANG_SOURCE_LANGUAGE_UNKNOWN)
     {
         m_requestImpl->getSink()->diagnose(SourceLoc(), Diagnostics::cannotDeduceSourceLanguage, inPath);
@@ -1888,7 +1894,9 @@ SlangResult OptionsParser::_parse(
 
                 RawTarget rawTarget;
                 rawTarget.format = CodeGenTarget(format);
-
+                // Silently allow redundant targets if it is the same as the last specified target.
+                if (m_rawTargets.getCount() != 0 && m_rawTargets.getLast().format == rawTarget.format)
+                    break;
                 m_rawTargets.add(rawTarget);
                 break;
             }
@@ -1991,7 +1999,9 @@ SlangResult OptionsParser::_parse(
                 RawEntryPoint rawEntryPoint;
                 rawEntryPoint.name = name.value;
                 rawEntryPoint.translationUnitIndex = m_currentTranslationUnitIndex;
-
+                // Silently allow duplicate entrypoints if it is the same as the last specified one.
+                if (m_rawEntryPoints.getCount() != 0 && m_rawEntryPoints.getLast().name == rawEntryPoint.name)
+                    break;
                 m_rawEntryPoints.add(rawEntryPoint);
                 break;
             }
@@ -2032,6 +2042,7 @@ SlangResult OptionsParser::_parse(
                         SLANG_RETURN_ON_FAIL(addInputPath(m_reader.getValueAndAdvance().getBuffer(), sourceLanguage));
                     }
                 }
+                linkage->m_optionSet.add(CompilerOptionName::Language, (int)sourceLanguage);
                 break;
             }
             case OptionKind::PassThrough:
@@ -2762,6 +2773,7 @@ SlangResult OptionsParser::_parse(
 
             if (impliedFormat == CodeGenTarget::Unknown)
             {
+
                 // If we hit this case, then it means that we need to pick the
                 // target to assocaite with this output based on its implied
                 // format, but the file path doesn't direclty imply a format

tests/bindings/multi-file.hlsl

@@ -1,4 +1,4 @@
-//TEST:COMPARE_HLSL:-no-mangle -profile sm_4_0 -entry main -stage vertex Tests/bindings/multi-file-extra.hlsl -entry main -stage fragment
+//TEST:COMPARE_HLSL:-no-mangle -profile sm_4_0 -entry main1 -stage vertex Tests/bindings/multi-file-extra.hlsl -entry main -stage fragment
 
 // Here we are going to test that we can correctly generating bindings when we
 // are presented with a program spanning multiple input files (and multiple entry points)
@@ -26,7 +26,7 @@ BEGIN_CBUFFER(vertexC)
 }
 END_CBUFFER(vertexC, register(b0))
 
-float4 main() : SV_POSITION
+float4 main1() : SV_POSITION
 {
     // Go ahead and use everything here, just to make sure things got placed correctly
     return use(sharedT, sharedS)

tests/diagnostics/command-line/duplicate-target.slang

@@ -1,3 +1,3 @@
 // duplicate-target.slang
 
-//DIAGNOSTIC_TEST:SIMPLE:-target hlsl -target hlsl
+//DIAGNOSTIC_TEST:SIMPLE:-target hlsl -target spirv -target hlsl

tests/diagnostics/gh-38-vs.hlsl

@@ -1,9 +1,9 @@
-//DIAGNOSTIC_TEST:SIMPLE: -profile sm_5_0 -entry main -stage vertex tests/diagnostics/gh-38-fs.hlsl -entry main -stage fragment -no-codegen
+//DIAGNOSTIC_TEST:SIMPLE: -profile sm_5_0 -entry main1 -stage vertex tests/diagnostics/gh-38-fs.hlsl -entry main -stage fragment -no-codegen
 
 // Ensure that we catch errors with overlapping or conflicting parameter bindings.
 
 Texture2D overlappingA : register(t0);
 
 Texture2D conflicting : register(t1);
 
-float4 main() : SV_Position { return 0; }
+float4 main1() : SV_Position { return 0; }