Add config.h.in which produces the config.h on CMake configure.

webcc/CMakeLists.txt

@@ -5,6 +5,11 @@ if(MSVC)
     add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 endif()
 
+configure_file(
+    "${CMAKE_CURRENT_SOURCE_DIR}/config.h.in"
+    "${CMAKE_CURRENT_BINARY_DIR}/config.h"
+    )
+
 # Adhere to GNU filesystem layout conventions.
 include(GNUInstallDirs)
 
@@ -102,10 +107,8 @@ set(TARGET webcc)
 
 add_library(${TARGET} STATIC ${HEADERS} ${SOURCES})
 
-if(WEBCC_ENABLE_INSTALL)
-    # Install lib and header files.
-    # On Linux, if CMAKE_INSTALL_PREFIX is ~, the lib (libwebcc.a) will be installed
-    # to ~/lib and header files will be installed to ~/include.
-    install(TARGETS ${TARGET} ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-    install(FILES ${HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/webcc)
-endif()
+# Install lib and header files.
+# On Linux, if CMAKE_INSTALL_PREFIX is ~, the lib (libwebcc.a) will be installed
+# to ~/lib and header files will be installed to ~/include.
+install(TARGETS ${TARGET} ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
+install(FILES ${HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/webcc)

webcc/config.h.in

@@ -0,0 +1,12 @@
+#ifndef WEBCC_CONFIG_H_
+#define WEBCC_CONFIG_H_
+
+// Compile configurations.
+
+#define WEBCC_ENABLE_LOG @WEBCC_ENABLE_LOG@
+
+#if WEBCC_ENABLE_LOG
+#define WEBCC_LOG_LEVEL @WEBCC_LOG_LEVEL@
+#endif
+
+#endif  // WEBCC_CONFIG_H_

webcc/logger.h

@@ -3,6 +3,9 @@
 
 // Simple console logger.
 
+// This file was generated from "config.h.in" by CMake.
+#include "webcc/config.h"
+
 #if WEBCC_ENABLE_LOG
 
 #include <cstring>  // for strrchr()
@@ -16,8 +19,6 @@
 #define WEBCC_FATA 4
 
 // Default log level.
-// You have to define a proper log level in CMakeLists.txt, e.g.,
-//   add_definitions(-DWEBCC_LOG_LEVEL=2)
 #ifndef WEBCC_LOG_LEVEL
 #define WEBCC_LOG_LEVEL WEBCC_WARN
 #endif