Hi,
if I'm not mistaken, the build system only tracks source dependencies, so
unless the changed code is shared by both library and main, it'll not rebuild
the main.
One solution could be:
SET_SOURCE_FILES_PROPERTIES(
cmTestMain.cpp PROPERTIES OBJECT_DEPENDS
${CMAKE_CURRENT_BINARY_DIR}/cmTestLib/libcmTestLib.a
)
As described here:
http://www.cmake.org/pipermail/cmake/2010-November/041049.html
(I might have used wrongpaths but you get the idea)
--
Gruesse,
Jakub
From: CMake [mailto:[email protected]] On Behalf Of Bill Greene
Sent: Freitag, 3. Oktober 2014 01:58
To: Michael Jackson
Cc: [email protected]
Subject: Re: [CMake] Main program not getting rebuilt when library changes.
I replaced the CMakeLists.txt for the library (cmTestLib) with simply this:
add_library (cmTestLib STATIC MySub.cpp MySub.h)
And I see exactly the same problem with the main program not getting rebuilt.
So I believe the GLOB issue is irrelevant to this particular problem.
Bill
On Thu, Oct 2, 2014 at 6:55 PM, Michael Jackson
<[email protected]<mailto:[email protected]>> wrote:
This probably is not completely your issue but I am sure it has something to do
with it. From the help for the "FILE" command:
GLOB will generate a list of all files that match the globbing
expressions and store it into the variable. Globbing expressions are
similar to regular expressions, but much simpler. If RELATIVE flag is
specified for an expression, the results will be returned as a
relative path to the given path. (We do not recommend using GLOB to
collect a list of source files from your source tree. If no
CMakeLists.txt file changes when a source is added or removed then the
generated build system cannot know when to ask CMake to regenerate.)
Take away: Do NOT use GLOB to find source files. List them out one by one in
the CMake file.
Try that and let us know if it works as you would expect it to.
Mike Jackson
_________________________________________________________
Mike Jackson
[email protected]<mailto:[email protected]>
BlueQuartz Software
www.bluequartz.net<http://www.bluequartz.net>
Principal Software Engineer Dayton, Ohio
On Thu, Oct 2, 2014 at 3:38 PM, Bill Greene
<[email protected]<mailto:[email protected]>> wrote:
Hi,
I'm trying to build a trivial project with cmake 3.0 and Visual Studio 2013.
The project has a top-level directory, a sub-directory with the main program,
and a sub-directory that builds a static library that the main program depends
on.
It all builds fine the first time. Then I change a routine in the library and
rebuild.
The static library gets rebuilt but the main program does not get re-linked.
I have perused the cmake-built VS project for hours and it looks fine to me; the
main program depends on the library as expected. I can't figure out why the main
program is not being rebuilt.
More embarrassing, I can easily build a similar VS project by hand that behaves
as
expected but I can' find the significant difference between the two that is
causing the
problematic behavior.
If anyone has any insights on this I would be very appreciative.
Here are my three CMakeLists.txt files:
top level:
-----------
cmake_minimum_required (VERSION 2.8)
project(cmTest)
add_subdirectory (cmTestMain)
add_subdirectory (cmTestLib)
cmTestLib
--------------
FILE(GLOB SRC *.cpp)
FILE(GLOB H_FILES *.h)
add_library (cmTestLib STATIC ${SRC} ${H_FILES})
cmTestMain
----------------
include_directories (${cmTest_SOURCE_DIR}/cmTestLib)
add_executable (cmTestMain cmTestMain.cpp)
target_link_libraries (cmTestMain cmTestLib)
Thanks.
Bill
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