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ENH: improve TRY_RUN() for crosscompiling: instead of just failing, it now

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creates two cache variables, one for the RUN_RESULT, one for the RUN_OUTPUT
(if required), which can be set or preset by the user. It has now also two
new arguments: RUN_OUTPUT_VARIABLE and COMPILE_OUTPUT_VARIABLE (the old
OUTPUT_VARIABLE merges both), so if only COMPILE_OUTPUT_VARIABLE is used the
run time output of the TRY_RUN is unused and the user doesn't have to care
about the output when crosscompiling. This is now used in FindThreads.cmake,
CheckC/CXXSourceRuns.cmake and TestBigEndian.cmake, which used the output
only for the logfile (compile output is still there). Test/TryCompile/ now
also tests the behaviour of OUTPUT_VARIABLE, RUN_OUTPUT_VARIABLE and
COMPILE_OUTPUT_VARIABLE.

Alex
This commit is contained in:
Alexander Neundorf
2007-06-01 11:16:29 -04:00
parent 26a5a295eb
commit eddf1cf39f
9 changed files with 329 additions and 63 deletions
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61
Source/cmTryRunCommand.h
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@@ -61,22 +61,55 @@ public:
{
return
" TRY_RUN(RUN_RESULT_VAR COMPILE_RESULT_VAR\n"
" bindir srcfile <CMAKE_FLAGS <Flags>>\n"
" <COMPILE_DEFINITIONS <flags>>\n"
" <OUTPUT_VARIABLE var>\n"
" <ARGS <arg1> <arg2>...>)\n"
"Try compiling a srcfile. Return the success or failure in "
"COMPILE_RESULT_VAR. Then if the compile succeeded, run the "
"executable and return the result in RUN_RESULT_VAR. "
"If the executable was built, but failed to run for some"
"reason, then RUN_RESULT_VAR will be set to FAILED_TO_RUN, and "
"the output will be in the COMPILE_RESULT_VAR. OUTPUT_VARIABLE "
"specifies the name of the variable to put all of the standard "
"output and standard error into.";
" bindir srcfile [CMAKE_FLAGS <Flags>]\n"
" [COMPILE_DEFINITIONS <flags>]\n"
" [COMPILE_OUTPUT_VARIABLE comp]\n"
" [RUN_OUTPUT_VARIABLE run]\n"
" [OUTPUT_VARIABLE var]\n"
" [ARGS <arg1> <arg2>...])\n"
"Try compiling a srcfile. Return TRUE or FALSE for success or failure "
"in COMPILE_RESULT_VAR. Then if the compile succeeded, run the "
"executable and return its exit code in RUN_RESULT_VAR. "
"If the executable was built, but failed to run, then RUN_RESULT_VAR "
"will be set to FAILED_TO_RUN. "
"COMPILE_OUTPUT_VARIABLE specifies the variable where the output from "
"the compile step goes. RUN_OUTPUT_VARIABLE specifies the variable "
"where the output from the running executable goes.\n"
"For compatibility reasons OUTPUT_VARIABLE is still supported, which "
"gives you the output from the compile and run step combined.\n\n"
"Cross compiling issues\n"
"When cross compiling, the executable compiled in the first step "
"usually cannot be run on the build host. TRY_RUN() checks the "
"CMAKE_CROSSCOMPILING variable to detect whether CMake is in "
"crosscompiling mode. If that's the case, it will still try to compile "
"the executable, but it will not try to run the executable. Instead it "
"will create cache variables which must be filled by the user or by "
"presetting them in some CMake script file to the values the "
"executable would have produced if it would have been run on its actual "
"target platform. These variables are RUN_RESULT_VAR (explanation see "
"above) and if RUN_OUTPUT_VARIABLE (or OUTPUT_VARIABLE) was used, an "
"additional cache variable "
"RUN_RESULT_VAR__COMPILE_RESULT_VAR__TRYRUN_OUTPUT."
"This is intended to hold stdout and stderr from the executable.\n"
"In order to make cross compiling your project easier, use TRY_RUN "
"only if really required. If you use TRY_RUN, use RUN_OUTPUT_VARIABLE "
"(or OUTPUT_VARIABLE) only if really required. Using them will require "
"that when crosscompiling, the cache variables will have to be set "
"manually to the output of the executable. You can also \"guard\" the "
"calls to TRY_RUN with IF(CMAKE_CROSSCOMPILING) and provide an "
"easy-to-preset alternative for this case.\n";
}
cmTypeMacro(cmTryRunCommand, cmCoreTryCompile);
cmTypeMacro(cmTryRunCommand, cmCoreTryCompile);
private:
void RunExecutable(const std::string& runArgs, std::string* runOutputContents);
void DoNotRunExecutable(const std::string& runArgs, const std::string& srcFile, std::string* runOutputContents);
std::string CompileResultVariable;
std::string RunResultVariable;
std::string OutputVariable;
std::string RunOutputVariable;
std::string CompileOutputVariable;
};