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On 5/11/2010 9:52 AM, Alok Govil wrote:
<blockquote cite="mid:COL101-W544D31E5195A3E6803E114BDFA0@phx.gbl"
type="cite">
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--></style>Hi
all,<br>
<br>
I am setting CMAKE_CXX_FLAGS to "-Wall -ansi -pedantic" but would like
to remove these flags for compilation<br>
of UnitTest++. I tried three methods of doing this with some issue
with each:<br>
<br>
1. string (REPLACE "-Wall" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})<br>
<font style="" color="#00b050"> # And likewise for -ansi and
-pedantic</font><br>
<br>
2. set (CMAKE_CXX_FLAGS "")<br>
<br>
3. unset (CMAKE_CXX_FLAGS CACHE)<br>
<br>
I am doing the above for both CMAKE_CXX_FLAGS and CMAKE_C_FLAGS.<br>
<br>
The problem with 1 and 2 is that they are not working. GCC (MinGW-W32)
still gives the concerned warnings. I do not get these warnings if I
do not set these flags at all to begin with.<br>
<br>
Method 3 does work. The problem however is that it removes
CMAKE_CXX_FLAGS globally, not just from CMakeList.txt for UnitTest++.
I could in principle recreate CMAKE_CXX_FLAGS but would like to
understand what's going on first.<br>
<br>
Method 1 worked well for MSVC (using different flags than for GCC).<br>
<br>
Here are all my files with relevant lines (shown only for
CMAKE_CXX_FLAGS but done also for CMAKE_C_FLAGS):<br>
<br>
<u>CXX_Flag_Overrides.cmake</u>:<br>
<font style="" color="#00b050"> # ...</font><br>
if (CMAKE_COMPILER_IS_GNUCXX)<br>
<font style="" color="#00b050"> # message
("CMAKE_COMPILER_IS_GNUCXX")</font><br>
set(CMAKE_CXX_FLAGS_INIT "${CMAKE_CXX_FLAGS_INIT} -Wall -ansi
-pedantic")<br>
endif()<br>
<font style="" color="#00b050"> # ...</font><br>
<br>
<u>CMakeLists.txt (top-level)</u><br>
<font style="" color="#00b050"> # ...</font><br>
set(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX
${CMAKE_CURRENT_SOURCE_DIR}/CXX_Flag_Overrides.cmake)<br>
project (projectname)<br>
<font style="" color="#00b050"> # ...</font><br>
add_subdirectory (UnitTest++)<br>
<font style="" color="#00b050"> # ...</font><br>
<br>
<u>CMakeLists.txt (UnitTest++)</u><br>
<font style="" color="#00b050"> # ...</font><br>
if (CMAKE_COMPILER_IS_GNUCXX) #
<a class="moz-txt-link-freetext" href="http://www.cmake.org/cmake/help/cmake-2-8-docs.html#variable:CMAKE_COMPILER_IS_GNULANG">http://www.cmake.org/cmake/help/cmake-2-8-docs.html#variable:CMAKE_COMPILER_IS_GNULANG</a><br>
message ("CMAKE_COMPILER_IS_GNUCXX")<br>
<font style="" color="#00b050">#string (REPLACE "-Wall" ""
CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})</font><font style="" color="#00b050"><br>
</font><font style="" color="#00b050"> #string (REPLACE
"-ansi" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})</font><font style=""
color="#00b050"><br>
</font><font style="" color="#00b050"> #string (REPLACE
"-pedantic" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})</font><font style=""
color="#00b050"><br>
</font><font style="" color="#00b050"> #unset (CMAKE_CXX_FLAGS
CACHE)</font><br>
set (CMAKE_CXX_FLAGS "")<br>
message ("${CMAKE_CXX_FLAGS}")<br>
endif()<br>
<font style="" color="#00b050"> # ...</font><br>
add_library (UnitTest++ ${Sources})<br>
<br>
Thanks,<br>
<br>
Alok<br>
</blockquote>
<br>
<br>
You might consider using the target property COMPILE_FLAGS as a more
fine-grained way to control the flags, instead of the build-wide
variable. See the help for more info.<br>
<br>
Ryan<br>
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