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try_compile: Test that CMake re-runs on input change 

With the Makefile and Ninja generators we expect that touching the input
source file for a try_compile will cause CMake to re-run on the next
build.  Extend the RunCMake.try_compile test with a case covering this.
Also check that CMake does not re-run if nothing has changed.
This commit is contained in:
Brad King 2015-01-23 09:45:00 -05:00
parent bf05938b8f
commit daf95a3827
8 changed files with 56 additions and 0 deletions
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1
Tests/RunCMake/try_compile/RerunCMake-nowork-ninja-no-console-stdout.txt Normal file
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@ -0,0 +1 @@
^ninja: no work to do\.$

5
Tests/RunCMake/try_compile/RerunCMake-rerun-ninja-no-console-stdout.txt Normal file
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@ -0,0 +1,5 @@
Running CMake on RerunCMake
FALSE
-- Configuring done
-- Generating done
-- Build files have been written to: .*/Tests/RunCMake/try_compile/RerunCMake-build

2
Tests/RunCMake/try_compile/RerunCMake-rerun-stderr.txt Normal file
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^Running CMake on RerunCMake
FALSE$

3
Tests/RunCMake/try_compile/RerunCMake-rerun-stdout.txt Normal file
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@ -0,0 +1,3 @@
-- Configuring done
-- Generating done
-- Build files have been written to: .*/Tests/RunCMake/try_compile/RerunCMake-build

2
Tests/RunCMake/try_compile/RerunCMake-stderr.txt Normal file
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@ -0,0 +1,2 @@
^Running CMake on RerunCMake
TRUE$

3
Tests/RunCMake/try_compile/RerunCMake-stdout.txt Normal file
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@ -0,0 +1,3 @@
-- Configuring done
-- Generating done
-- Build files have been written to: .*/Tests/RunCMake/try_compile/RerunCMake-build

7
Tests/RunCMake/try_compile/RerunCMake.cmake Normal file
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@ -0,0 +1,7 @@
message("Running CMake on RerunCMake") # write to stderr if cmake reruns
enable_language(C)
try_compile(res
"${CMAKE_CURRENT_BINARY_DIR}"
SOURCES "${CMAKE_CURRENT_BINARY_DIR}/TryCompileInput.c"
)
message("${res}")

33
Tests/RunCMake/try_compile/RunCMakeTest.cmake
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@ -17,3 +17,36 @@ run_cmake(NonSourceCopyFile)
run_cmake(NonSourceCompileDefinitions)
run_cmake(CMP0056)
if(RunCMake_GENERATOR MATCHES "Make|Ninja")
# Use a single build tree for a few tests without cleaning.
set(RunCMake_TEST_BINARY_DIR ${RunCMake_BINARY_DIR}/RerunCMake-build)
set(RunCMake_TEST_NO_CLEAN 1)
file(REMOVE_RECURSE "${RunCMake_TEST_BINARY_DIR}")
file(MAKE_DIRECTORY "${RunCMake_TEST_BINARY_DIR}")
set(in_tc "${RunCMake_TEST_BINARY_DIR}/TryCompileInput.c")
file(WRITE "${in_tc}" "int main(void) { return 0; }\n")
# Older Ninja keeps all rerun output on stdout
set(ninja "")
if(RunCMake_GENERATOR STREQUAL "Ninja")
execute_process(COMMAND ${RunCMake_MAKE_PROGRAM} --version
OUTPUT_VARIABLE ninja_version OUTPUT_STRIP_TRAILING_WHITESPACE)
if(ninja_version VERSION_LESS 1.5)
set(ninja -ninja-no-console)
endif()
endif()
message(STATUS "RerunCMake: first configuration...")
run_cmake(RerunCMake)
run_cmake_command(RerunCMake-nowork${ninja} ${CMAKE_COMMAND} --build .)
execute_process(COMMAND ${CMAKE_COMMAND} -E sleep 1) # handle 1s resolution
message(STATUS "RerunCMake: modify try_compile input...")
file(WRITE "${in_tc}" "does-not-compile\n")
run_cmake_command(RerunCMake-rerun${ninja} ${CMAKE_COMMAND} --build .)
run_cmake_command(RerunCMake-nowork${ninja} ${CMAKE_COMMAND} --build .)
unset(RunCMake_TEST_BINARY_DIR)
unset(RunCMake_TEST_NO_CLEAN)
endif()