Add the new features on llvm 8 and later

Author: ghaith

src/debug_info.rs

@@ -79,7 +79,7 @@
 //!     /* inlined_at */ None);
 //! builder.set_current_debug_location(&context, loc);
 //! 
-//! //Create global variable
+//! // Create global variable
 //! let gv = module.add_global(context.i64_type(), Some(inkwell::AddressSpace::Global), "gv");
 //!    
 //!
@@ -119,13 +119,14 @@ use llvm_sys::debuginfo::{
     LLVMDIBuilderCreateDebugLocation, LLVMDIBuilderCreateExpression, LLVMDIBuilderCreateFile,
     LLVMDIBuilderCreateFunction, LLVMDIBuilderCreateLexicalBlock, LLVMDIBuilderCreateMemberType,
     LLVMDIBuilderCreateNameSpace, LLVMDIBuilderCreateParameterVariable, 
-    LLVMDIBuilderCreateGlobalVariableExpression,LLVMDIBuilderCreateConstantValueExpression,
     LLVMDIBuilderCreateStructType, LLVMDIBuilderCreateSubroutineType, LLVMDIBuilderCreateUnionType,
     LLVMDIBuilderFinalize, LLVMDIBuilderInsertDbgValueBefore, LLVMDIBuilderInsertDeclareAtEnd,
     LLVMDIBuilderInsertDeclareBefore, LLVMDILocationGetColumn, LLVMDILocationGetLine,
     LLVMDILocationGetScope, LLVMDITypeGetAlignInBits, LLVMDITypeGetOffsetInBits,
     LLVMDITypeGetSizeInBits,
 };
+#[llvm_versions(8.0..=latest)]
+use llvm_sys::debuginfo::{LLVMDIBuilderCreateGlobalVariableExpression,LLVMDIBuilderCreateConstantValueExpression};
 use llvm_sys::prelude::{LLVMDIBuilderRef, LLVMMetadataRef};
 use llvm_sys::core::LLVMMetadataAsValue;
 use std::convert::TryInto;
@@ -598,6 +599,7 @@ impl<'ctx> DebugInfoBuilder<'ctx> {
         }
     }
 
+    #[llvm_versions(8.0..=latest)]
     pub fn create_global_variable_expression(
         &self,
         scope: DIScope<'ctx>,
@@ -636,6 +638,7 @@ impl<'ctx> DebugInfoBuilder<'ctx> {
         }
     }
 
+    #[llvm_versions(8.0..=latest)]
     pub fn create_constant_expression(&self,
         value : i64,
     ) -> DIExpression<'ctx> {

src/values/global_value.rs

@@ -9,6 +9,7 @@ use llvm_sys::core::{LLVMHasUnnamedAddr, LLVMSetUnnamedAddr};
 use llvm_sys::core::{LLVMGetUnnamedAddress, LLVMSetUnnamedAddress};
 #[llvm_versions(7.0..=latest)]
 use llvm_sys::LLVMUnnamedAddr;
+#[llvm_versions(8.0..=latest)]
 use llvm_sys::core::LLVMGlobalSetMetadata;
 use llvm_sys::prelude::LLVMValueRef;
 
@@ -20,7 +21,9 @@ use crate::support::{to_c_str, LLVMString};
 #[llvm_versions(7.0..=latest)]
 use crate::comdat::Comdat;
 use crate::values::traits::AsValueRef;
-use crate::values::{BasicValueEnum, BasicValue, PointerValue, Value, MetadataValue};
+use crate::values::{BasicValueEnum, BasicValue, PointerValue, Value};
+#[llvm_versions(8.0..=latest)]
+use crate::values::MetadataValue;
 
 // REVIEW: GlobalValues are always PointerValues. With SubTypes, we should
 // compress this into a PointerValue<Global> type
@@ -267,6 +270,7 @@ impl<'ctx> GlobalValue<'ctx> {
     }
 
     /// Sets a metadata of the given type on the GlobalValue
+    #[llvm_versions(8.0..=latest)]
     pub fn set_metadata(self, metadata: MetadataValue<'ctx>, kind_id: u32) {
         unsafe {
             LLVMGlobalSetMetadata(self.as_value_ref(), kind_id, metadata.as_metadata_ref())

tests/all/test_debug_info.rs

@@ -1,8 +1,9 @@
 use inkwell::context::Context;
 use inkwell::debug_info::{
     AsDIScope, DIFlags, DIFlagsConstants, DISubprogram, DWARFEmissionKind, DWARFSourceLanguage,
-    DebugInfoBuilder,
 };
+#[llvm_versions(8.0..=latest)]
+use inkwell::debug_info::DebugInfoBuilder;
 use inkwell::module::FlagBehavior;
 
 #[test]
@@ -302,6 +303,7 @@ fn test_anonymous_basic_type() {
     );
 }
 
+#[llvm_versions(8.0..=latest)]
 #[test]
 fn test_global_expressions() {