1 /*============================================================================
2 CMake - Cross Platform Makefile Generator
3 Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
5 Distributed under the OSI-approved BSD License (the "License");
6 see accompanying file Copyright.txt for details.
8 This software is distributed WITHOUT ANY WARRANTY; without even the
9 implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
10 See the License for more information.
11 ============================================================================*/
12 #ifndef cmTryRunCommand_h
13 #define cmTryRunCommand_h
15 #include "cmCoreTryCompile.h"
17 /** \class cmTryRunCommand
18 * \brief Specifies where to install some files
20 * cmTryRunCommand is used to test if soucre code can be compiled
22 class cmTryRunCommand : public cmCoreTryCompile
26 * This is a virtual constructor for the command.
28 virtual cmCommand* Clone()
30 return new cmTryRunCommand;
34 * This is called when the command is first encountered in
35 * the CMakeLists.txt file.
37 virtual bool InitialPass(std::vector<std::string> const& args,
38 cmExecutionStatus &status);
41 * The name of the command as specified in CMakeList.txt.
43 virtual const char* GetName() const { return "try_run";}
46 * Succinct documentation.
48 virtual const char* GetTerseDocumentation() const
50 return "Try compiling and then running some code.";
56 virtual const char* GetFullDocumentation() const
59 " try_run(RUN_RESULT_VAR COMPILE_RESULT_VAR\n"
60 " bindir srcfile [CMAKE_FLAGS <Flags>]\n"
61 " [COMPILE_DEFINITIONS <flags>]\n"
62 " [COMPILE_OUTPUT_VARIABLE comp]\n"
63 " [RUN_OUTPUT_VARIABLE run]\n"
64 " [OUTPUT_VARIABLE var]\n"
65 " [ARGS <arg1> <arg2>...])\n"
66 "Try compiling a srcfile. Return TRUE or FALSE for success or failure "
67 "in COMPILE_RESULT_VAR. Then if the compile succeeded, run the "
68 "executable and return its exit code in RUN_RESULT_VAR. "
69 "If the executable was built, but failed to run, then RUN_RESULT_VAR "
70 "will be set to FAILED_TO_RUN. "
71 "COMPILE_OUTPUT_VARIABLE specifies the variable where the output from "
72 "the compile step goes. RUN_OUTPUT_VARIABLE specifies the variable "
73 "where the output from the running executable goes.\n"
74 "For compatibility reasons OUTPUT_VARIABLE is still supported, which "
75 "gives you the output from the compile and run step combined.\n"
76 "Cross compiling issues\n"
77 "When cross compiling, the executable compiled in the first step "
78 "usually cannot be run on the build host. try_run() checks the "
79 "CMAKE_CROSSCOMPILING variable to detect whether CMake is in "
80 "crosscompiling mode. If that's the case, it will still try to compile "
81 "the executable, but it will not try to run the executable. Instead it "
82 "will create cache variables which must be filled by the user or by "
83 "presetting them in some CMake script file to the values the "
84 "executable would have produced if it had been run on its actual "
85 "target platform. These variables are RUN_RESULT_VAR (explanation see "
86 "above) and if RUN_OUTPUT_VARIABLE (or OUTPUT_VARIABLE) was used, an "
87 "additional cache variable "
88 "RUN_RESULT_VAR__COMPILE_RESULT_VAR__TRYRUN_OUTPUT."
89 "This is intended to hold stdout and stderr from the executable.\n"
90 "In order to make cross compiling your project easier, use try_run "
91 "only if really required. If you use try_run, use RUN_OUTPUT_VARIABLE "
92 "(or OUTPUT_VARIABLE) only if really required. Using them will require "
93 "that when crosscompiling, the cache variables will have to be set "
94 "manually to the output of the executable. You can also \"guard\" the "
95 "calls to try_run with if(CMAKE_CROSSCOMPILING) and provide an "
96 "easy-to-preset alternative for this case.\n"
97 "Set variable CMAKE_TRY_COMPILE_CONFIGURATION to choose a build "
102 cmTypeMacro(cmTryRunCommand, cmCoreTryCompile);
104 void RunExecutable(const std::string& runArgs,
105 std::string* runOutputContents);
106 void DoNotRunExecutable(const std::string& runArgs,
107 const std::string& srcFile,
108 std::string* runOutputContents);
110 std::string CompileResultVariable;
111 std::string RunResultVariable;
112 std::string OutputVariable;
113 std::string RunOutputVariable;
114 std::string CompileOutputVariable;