improve warning/version diagnostics GEOS; #844

Author: edzer

R/init.R

@@ -69,10 +69,15 @@ setOldClass("sfg")
 }
 
 .onAttach = function(libname, pkgname) {
-	m = paste0("Linking to GEOS ", CPL_geos_version(), ", GDAL ", CPL_gdal_version(), ", proj.4 ", CPL_proj_version())
+	m = paste0("Linking to GEOS ", strsplit(CPL_geos_version(TRUE), "-")[[1]][1],
+		", GDAL ", CPL_gdal_version(), ", PROJ ", CPL_proj_version())
 	packageStartupMessage(m)
-	if (length(grep(sf:::CPL_geos_version(FALSE, TRUE), sf:::CPL_geos_version(TRUE))) != 1)
-		packageStartupMessage("WARNING: different compile-time and runtime versions for GEOS")
+	if (length(grep(sf:::CPL_geos_version(FALSE, TRUE), sf:::CPL_geos_version(TRUE))) != 1) {
+		packageStartupMessage("WARNING: different compile-time and runtime versions for GEOS found:")
+		packageStartupMessage(paste(
+			"Linked against:", CPL_geos_version(TRUE, TRUE), 
+			"compiled against:", CPL_geos_version(FALSE, TRUE)))
+	}
 }
 
 #' Provide the external dependencies versions of the libraries linked to sf