Daniel wrote:
I am currently using the NMake generator when compiling in Windows with
MSVC, but I would like to use the MinGW generator so that I can use its
-j switch. I am able to build everything with MinGW but the -j switch
doesn't seem to do anything.
I made a simple test application with the following files:
CMakeLists.txt
=====================
project (parallel)
add_executable (helloDemo main.cxx a_demo.cxx b_demo.cxx c_demo.cxx
d_demo.cxx e_demo.cxx f_demo.cxx g_demo.cxx h_demo.cxx)
=====================
main.cxx
=====================
int main(int argc, char* argv[])
{
return 0;
}
=====================
a_demo.cxx -- h_demo.cxx (just so it take a second to compile)
=====================
#include <cstdio>
=====================
Then I ran cmake like this, I found that I needed to add these
definitions to get it to use MSVC. This is with mingw make
cmake -G "MinGW Makefiles" .. -DCMAKE_MAKE_PROGRAM=make
-DCMAKE_C_COMPILER="C:/Program Files/Microsoft Visual Studio
8/VC/bin/cl.exe" -DCMAKE_CXX_COMPILER="C:/Program Files/Microsoft Visual
Studio 8/VC/bin/cl.exe"
But when I run 'make -j4' it doesn't run in parallel.
If I configure like this (cygwin make):
cmake -G "Unix Makefiles" .. -DCMAKE_C_COMPILER="C:/Program
Files/Microsoft Visual Studio 8/VC/bin/cl.exe"
-DCMAKE_CXX_COMPILER="C:/Program Files/Microsoft Visual Studio
8/VC/bin/cl.exe" -DCMAKE_MAKE_PROGRAM=C:/cygwin/bin/make
Then when I run 'make -j4' it does run in parallel.
I should add that I tested my copy of mingw make to be sure it worked
properly with the -j option by creating a Makefile by hand that had
sleep statements.
I also tried to use the Unix Makefiles generator for my real project but
I got:
PCHeader/CMakeFiles/PCHeader.dir/build.make:44: *** target pattern
contains no `%'. Stop.
make[1]: *** [PCHeader/CMakeFiles/PCHeader.dir/all] Error 2
make: *** [all] Error 2
I use gmake with MSVC and use the "Unix Makefile" generator. I use a
modified cygwin make that can be found here:
http://www.cmake.org/files/cygwin/make.exe
So, install the basic cygwin with or without make. Then put the above
make into /usr/bin. Then setup your environment for MSVC (vcvars.bat
stuff). Then use the "Unix Makefile" generator. The -j will work
then. I think gmake only uses the -j if it has a unix shell, and it
does not work from the dos shell.
-Bill
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