The following issue has been SUBMITTED.
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http://www.cmake.org/Bug/view.php?id=15666
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Reported By: Nils Gladitz
Assigned To:
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Project: CMake
Issue ID: 15666
Category: (No Category)
Reproducibility: always
Severity: minor
Priority: normal
Status: new
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Date Submitted: 2015-07-28 05:56 EDT
Last Modified: 2015-07-28 05:56 EDT
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Summary: Ninja may unnecessarily relink on windows
Description:
I have the following windows specific test case:
cmake_minimum_required(VERSION 3.3)
project(Foo CXX)
if(NOT EXISTS test.cpp)
file(WRITE test.cpp "__declspec(dllexport) void foo() {}")
endif()
add_custom_target(touch
COMMAND ${CMAKE_COMMAND} -E touch ${CMAKE_SOURCE_DIR}/test.cpp
)
add_library(foo SHARED test.cpp)
Steps to Reproduce:
I configured the given test project with the "Ninja" generator from a "Visual
Studio 2013 (x64)" environment.
1. ninja # builds the project as expected
2. ninja # outputs "ninja: no work to do." as expected
3. ninja touch # touches test.cpp
4. ninja # recompiles and relinks as expected
5-n. ninja # unexpectedly relinks; expected is "ninja: no work to do."
Additional Information:
It looks like the relink happens because the linker updates foo.dll but does not
touch foo.lib.
Which leads to (ninja -d explain):
ninja explain: output foo.lib older than most recent input
CMakeFiles/foo.dir/test.cpp.obj (459779794 vs 459780205)
ninja explain: foo.dll is dirty
[1/1] Linking CXX shared library foo.dll
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Issue History
Date Modified Username Field Change
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2015-07-28 05:56 Nils Gladitz New Issue
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