gcc compiler flags fixed

conanfile.py

@@ -82,6 +82,8 @@ class UnitsConan(ConanFile):
 
     def package_info(self):
         self.cpp_info.includedirs = ['include']
+        if self.settings.compiler == "gcc":
+            self.cpp_info.cxxflags = ["-fconcepts -Wno-literal-suffix"]
 
     def package_id(self):
         self.info.settings.clear()

src/CMakeLists.txt

@@ -60,11 +60,13 @@ target_include_directories(units
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
         $<INSTALL_INTERFACE:include>
 )
-target_compile_options(units
+if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
+    target_compile_options(units
         INTERFACE
             -Wno-literal-suffix
             -fconcepts
-)
+    )
+endif()
 add_library(mp::units ALIAS units)
 
 # installation info