Hi,
I am trying to compile a multi threaded application to WebAssembly. The
application uses OpenMP for multithreading.
I have already downloaded the source files for OpenMP and compiled it for
my host machine using make. With the following command I can get it to link
with a simple demo application on my machine:
g++ -Wall -Werror -pedantic main.o -o main.x
/$PATH_TO_OPENMP/build/runtime/src/libgomp.a -pthread -lstdc++
-Wl,--no-as-needed -ldl
I then tried to compile OpenMP to the llvm bytecode format used by
Emscripten. To do so I tried to run 'emmake make', so that the emscripten
framework executes the OpenMP makefiles with a suitable compiler. As
emscripten does not like shared object files I compiled it to static
library .a files. This works and actually gives me object files to which I
can link.
I then wanted to link my demo application with the following command
em++ -Wall -Werror -pedantic main.o -o main.html
/home/main/data/Programming/openMP/openmp_web/build/runtime/src/libgomp.a
-pthread -lstdc++ -Wl,--no-as-needed -ldl
But I get these warnings, that it couldn't link to OpenMP files:
shared:WARNING: object
/tmp/emscripten_temp_ONa0eU_archive_contents/kmp_atomic.cpp.o is not a valid
object file for emscripten, cannot link
.
.
shared:WARNING: object
/tmp/emscripten_temp_ONa0eU_archive_contents/kmp_str.cpp.o is not a valid
object file for emscripten, cannot link
shared:WARNING: object /tmp/emscripten_temp_ONa0eU_archive_contents
So I figured I must have compiled OpenMP with the wrong compiler. I then
tried to change the compiler when building the library by using the
following commands:
cmake -DCMAKE_C_COMPILER=emcc -DCMAKE_CXX_COMPILER=em++
-DLIBOMP_LIB_TYPE=normal -DLIBOMP_ENABLE_SHARED=OFF -DCMAKE_BUILD_TYPE=Release
-DLIBOMP_ARCH=x86_64 OPENMP_STANDALONE_BUILD=1 ..
emmake make
But this just gives strange errors on some missing system variables
/home/main/data/Programming/openMP/openmp_web/runtime/src/kmp_platform.h:82:2:
error: Unknown OS
/home/main/data/Programming/openMP/openmp_web/runtime/src/kmp_platform.h:203:2:
error: Unknown or unsupported architecture
In file included from
/home/main/data/Programming/openMP/openmp_web/runtime/src/kmp_alloc.cpp:13:
In file included from
/home/main/data/Programming/openMP/openmp_web/runtime/src/kmp.h:77:
/home/main/data/Programming/openMP/openmp_web/runtime/src/kmp_os.h:171:2:
error: "Can't determine size_t printf format specifier."
Does anyone have an idea on what I could do differently?
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