May be you could use TRY_RUN to detect endianity
with something like:
TRY_RUN(
ENDIANESS_RESULT
ENDIANESS_COMPILE
/tmp/
${CMAKE_CURRENT_SOURCE_DIR}/make/endianess.c
OUTPUT_VARIABLE ENDIANESS_OUT
)
MESSAGE(STATUS "ENDIANITY is :${ENDIANESS_OUT}")
endianess.c is attached.
The trouble I have is that I expected to have
my "endianess" program output in ${ENDIANESS_OUT}
but I get too much including
compilation process ouput.
-- ENDIANITY is :gmake[1]: Entering directory `/tmp/CMakeFiles/CMakeTmp'
/usr/bin/gmake -f CMakeFiles/cmTryCompileExec.dir/build.make
CMakeFiles/cmTryCompileExec.dir/build
gmake[2]: Entering directory `/tmp/CMakeFiles/CMakeTmp'
/usr/bin/cmake -E cmake_progress_report /tmp/CMakeFiles/CMakeTmp/CMakeFiles 1
Building C object
CMakeFiles/cmTryCompileExec.dir/home/noularde/TSP/tsp_all/tsp/src/util/libutil/endianess.o
/usr/bin/gcc -o
CMakeFiles/cmTryCompileExec.dir/home/noularde/TSP/tsp_all/tsp/src/util/libutil/endianess.o
-c /home/noularde/TSP/tsp_all/tsp/src/util/libutil/endianess.c
Linking C executable cmTryCompileExec
/usr/bin/cmake -P CMakeFiles/cmTryCompileExec.dir/cmake_clean_target.cmake
/usr/bin/gcc -fPIC
"CMakeFiles/cmTryCompileExec.dir/home/noularde/TSP/tsp_all/tsp/src/util/libutil/endianess.o"
-o cmTryCompileExec -rdynamic
gmake[2]: Leaving directory `/tmp/CMakeFiles/CMakeTmp'
gmake[1]: Leaving directory `/tmp/CMakeFiles/CMakeTmp'
LITTLE_ENDIAN
I have played with STRING(REFEX MATCH ...)
with no success.
I never use TRY_RUN but now that I have tried it I wonder
how to use it if I am not able to separate compile output
from RUN output?
2006/11/22, Mike Jackson <[EMAIL PROTECTED]>:
I have recently joined a project where I am to do some coding. The code base
is cross platform HPC type code and the original coders have defined their
own little/big endian #defines (L_ENDIAN & B_ENDIAN). They pass this into
the compiler via -DL_ENDIAN during compiles.
Is there a way to automatically have cmake figure this out for me? Right now
I have an OPTION(....) clause in my CMakeLists.txt file to select the right
value.. which is stupid and error prone but it worked to boot strap the
process for the moment.
Any hints would be appreciated..
--
Mike Jackson Senior Research Engineer
Innovative Management & Technology Services
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--
Erk
#include <stdio.h>
int
main(int argc, char** argv) {
int i = 0;
((char*)&i)[0] = 1;
if (1 == i) {
printf("LITTLE_ENDIAN\n");
} else {
printf("BIG_ENDIAN\n");
}
}
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