[runtime] Get Mono's LLVM API version from the LLVM repo when cross compiling.

The previous code was hardcoding Mono's LLVM API version which was less than ideal. The API has been bumped twice since without this being updated.

This depends on a recent Mono LLVM version, at least https://github.com/mono/llvm/commit/607aeaae423da73e6ddfe49af4741fa1bc5f9e78.

diff --git a/configure.ac b/configure.ac
index c7a5493ac806fe53f73e489bba0ff584316e6712..c2d45b2bb0163106d221d56bfee3890a0f7eec39 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -2688,7 +2688,9 @@ if test "x$enable_llvm" = "xyes"; then
          -lLLVMObject -lLLVMMCParser -lLLVMBitReader -lLLVMExecutionEngine -lLLVMMC -lLLVMCore \
          -lLLVMSupport -lstdc++"
        LLVM_LIBS="$LLVM_LIBS $LLVM_SYSTEM_LIBS"
-       llvm_api_version=1
+
+       llvm_config_path=$with_llvm/include/llvm/Config/llvm-config.h
+       llvm_api_version=`awk '/MONO_API_VERSION/ { print $3 }' $llvm_config_path`
    fi  
 
    if test "x$llvm_api_version" = "x"; then