System Introspection (Step 4)

c/cmake_tutorial/step4/CMakeLists.txt

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+cmake_minimum_required (VERSION 2.6)
+project (Tutorial)
+# The version number.
+set (Tutorial_VERSION_MAJOR 1)
+set (Tutorial_VERSION_MINOR 0)
+
+# does this sytem provide the log and exp functions?
+include (CheckFunctionExists)
+check_function_exists (strcmpi HAVE_STRCMPI)
+check_function_exists (strcasecmp HAVE_STRCASECMP)
+
+# configure a header file to pass some of the CMake setting
+# to the source code
+configure_file (
+  "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in"
+  "${PROJECT_BINARY_DIR}/TutorialConfig.h"
+  )
+
+# add the binary tree to the search path for include files
+# so that we will find TutorialConfig.h
+include_directories ("${PROJECT_BINARY_DIR}")
+
+# should we use our own math functions?
+option (USE_MYMATH
+        "Use tutorial provided math implementation" ON)
+
+if (USE_MYMATH)
+  include_directories ("${PROJECT_SOURCE_DIR}/MathFunctions")
+  add_subdirectory (MathFunctions)
+  set (EXTRA_LIBS ${EXTRA_LIBS} MathFunctions)
+endif (USE_MYMATH)
+
+# add the executable
+add_executable (Tutorial tutorial.cxx)
+target_link_libraries (Tutorial ${EXTRA_LIBS})
+
+# add the install targets and files
+install (TARGETS Tutorial DESTINATION bin)
+install (FILES "${PROJECT_BINARY_DIR}/TutorialConfig.h"
+         DESTINATION include)
+
+# does the application run
+add_test (TutorialRuns Tutorial 25)
+
+# does it sqrt of 25
+add_test (TutorialComp25 Tutorial 25)
+
+set_tests_properties (TutorialComp25
+  PROPERTIES PASS_REGULAR_EXPRESSION "25 is 5")
+
+# does it handle negative numbers
+add_test (TutorialNegative Tutorial -25)
+set_tests_properties (TutorialNegative
+  PROPERTIES PASS_REGULAR_EXPRESSION "-25 is -nan")
+
+# does it handle small numbers
+add_test (TutorialSmall Tutorial 0.0001)
+set_tests_properties (TutorialSmall
+  PROPERTIES PASS_REGULAR_EXPRESSION "0.0001 is 0.01")
+
+# does the usage message work?
+add_test (TutorialUsage Tutorial)
+set_tests_properties (TutorialUsage
+  PROPERTIES
+  PASS_REGULAR_EXPRESSION "Usage:.*number")
+
+#define a macro to simplify adding tests, then use it
+macro (do_test arg result)
+  add_test (TutorialComp${arg} Tutorial ${arg})
+  set_tests_properties (TutorialComp${arg}
+    PROPERTIES PASS_REGULAR_EXPRESSION ${result})
+endmacro (do_test)
+
+# do a bunch of result based tests
+do_test (25 "25 is 5")
+do_test (0 "0 is 0")
+
+# enable testing
+ENABLE_TESTING()

c/cmake_tutorial/step4/MathFunctions/CMakeLists.txt

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+add_library (MathFunctions mysqrt.cxx)
+
+# add the install targets and files
+install (TARGETS MathFunctions DESTINATION bin)
+install (FILES MathFunctions.h DESTINATION include)

c/cmake_tutorial/step4/MathFunctions/MathFunctions.h

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+#include "mysqrt.h"

c/cmake_tutorial/step4/MathFunctions/mysqrt.cxx

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+#include <math.h>
+
+double
+mysqrt (double x)
+{
+  return sqrt (x);
+}

c/cmake_tutorial/step4/MathFunctions/mysqrt.h

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+double
+mysqrt (double);

c/cmake_tutorial/step4/TutorialConfig.h.in

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+// the configured options and settings for Tutorial
+#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@
+#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@
+#cmakedefine USE_MYMATH
+// does the platform provide exp and log functions?
+#cmakedefine HAVE_STRCMPI
+#cmakedefine HAVE_STRCASECMP

c/cmake_tutorial/step4/tutorial.cxx

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+// A simple program that computes the square root of a number
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <string.h>
+#include "TutorialConfig.h"
+#ifdef USE_MYMATH
+#include "MathFunctions.h"
+#endif
+#if defined HAVE_STRCMPI
+#define strcasecmp strcmpi
+#elif defined HAVE_STRCASECMP
+#define strcmpi strcasecmp
+#endif
+
+int main (int argc, char *argv[])
+{
+  if (argc < 2)
+    {
+    fprintf(stdout,"%s Version %d.%d\n",
+            argv[0],
+            Tutorial_VERSION_MAJOR,
+            Tutorial_VERSION_MINOR);
+    fprintf(stdout,"Usage: %s number\n",argv[0]);
+    return 1;
+    }
+  double inputValue = atof(argv[1]);
+#ifdef USE_MYMATH
+  puts ("Using mysqrt ()\n");
+  double outputValue = mysqrt(inputValue);
+#else
+  puts ("Using system sqrt ()\n");
+  double outputValue = sqrt(inputValue);
+#endif
+  fprintf(stdout,"The square root of %g is %g\n",
+          inputValue, outputValue);
+
+  if (strcmpi ("string1", "string2"))
+    {
+      puts ("string1 != string2\n");
+    }
+  else
+    {
+      puts ("string1 == string2\n");
+    }
+
+  return 0;
+}