On 2. Dec, 2009, at 20:22 , Tyler Roscoe wrote:
On Wed, Dec 02, 2009 at 07:58:43PM +0100, Jörg Förstner wrote:
I thought CMake would find the custom command and generate the file
"gen.h"
Instead an error occurs, this is the output:
-- Configuring done
CMake Error in libfoo.so/CMakeLists.txt:
Cannot find source file "gen.h". Tried extensions .c .C .c++ .cc
.cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp .hxx .in .txx
Why doesn't CMake generate the file?
------------------
# Set variable containing all source files
SET( SRCS
foo1.c
)
# Tell CMake that "gen.h" is a generated file
SET_SOURCE_FILE_PROPERTIES( gen.h PROPERTIES GENERATED 1 )
# Define custom command to generate "gen.h"
ADD_CUSTOM_COMMAND(
OUTPUT gen.h
COMMAND echo "this command would generate 'gen.h' from data.txt"
DEPENDS data.txt
)
# Define to build a target shared object library named "libfoo.so"
from the source files "${SRCS}".
# The file "foo1.c" depends on the generated include file "gen.h"
ADD_LIBRARY( foo SHARED ${SRCS} gen.h )
------------------
Conceptually this looks correct.
Have you tried this with a custom command that actually creates gen.h?
The example you posted just echoes and doesn't generate anything.
tyler
Also, you might want to use full paths to gen.h (by e.g. prefixing $
{CMAKE_CURRENT_BINARY_DIR}, or wherever your program outputs gen.h).
Further, you don't need to set the source file property GENERATED.
CMake does that for you in the ADD_CUSTOM_COMMAND(OUTPUT $
{CMAKE_CURRENT_BINARY_DIR}/gen.h ...).
Michael
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