With EMCC_DEBUG environment variable set to 1 and adding --source-map-base param to get rid of first warning I see the warning occurs during handle_final_wasm_symbols step.
What does it mean? building:DEBUG: handle_final_wasm_symbols warning: no output file specified, not emitting output C:\~src\Emscripten\play1\benchmarks\with-syms>set EMCC_DEBUG=1 C:\~src\Emscripten\play1\benchmarks\with-syms>emcc benchmark_utf8.cpp -s "EXTRA_EXPORTED_RUNTIME_METHODS=['UTF8ToString']" --emit-symbol-map --source-map-base http://localhost:8080/benchmarks/with-syms/ -o benchmark_utf8-wasm-with-semit-symbol-map.html --embed-file utf8_corpus.txt -g4 shared:DEBUG: EM_CONFIG is located in C:\~src\Emscripten\emsdk\.emscripten emcc:WARNING: invocation: C:\~src\Emscripten\emsdk\upstream\emscripten\\emcc.py benchmark_utf8.cpp -s EXTRA_EXPORTED_RUNTIME_METHODS=['UTF8ToString'] --emit-symbol-map --source-map-base http://localhost:8080/benchmarks/with-syms/ -o benchmark_utf8-wasm-with-semit-symbol-map.html --embed-file utf8_corpus.txt -g4 (in C:\~src\Emscripten\play1\benchmarks\with-syms) shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/upstream/bin\clang.exe --version shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/node/12.18.1_64bit/bin/node.exe --version shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/upstream/bin\llc.exe --version shared:INFO: (Emscripten: Running sanity checks) shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/node/12.18.1_64bit/bin/node.exe -e console.log("hello") emcc:DEBUG: compiling to bitcode emcc:DEBUG: emcc step "parse arguments and setup" took 0.59 seconds cache:DEBUG: PID 20208 acquiring multiprocess file lock to Emscripten cache at C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm cache:DEBUG: done emcc:DEBUG: compiling source file: benchmark_utf8.cpp shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/upstream/bin\clang++.exe -target wasm32-unknown-emscripten -D__EMSCRIPTEN_major__=2 -D__EMSCRIPTEN_minor__=0 -D__EMSCRIPTEN_tiny__=8 -D_LIBCPP_ABI_VERSION=2 -Dunix -D__unix -D__unix__ -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\include\libcxx -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\lib\libcxxabi\include -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\include\compat -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\include -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\include\libc -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\lib\libc\musl\arch\emscripten -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\local\include -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\include\SSE -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\include\neon -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\lib\compiler-rt\include -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\lib\libunwind\include -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm\include -DEMSCRIPTEN -fignore-exceptions -o benchmark_utf8-wasm-with-semit-symbol-map.html -g benchmark_utf8.cpp -Xclang -isystemC:\~src\Emscripten\emsdk\upstream\emscripten\system\include\SDL -c -o C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8_0.o -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr emcc:DEBUG: emcc step "compile inputs" took 1.00 seconds emcc:DEBUG: emcc step "process inputs" took 0.00 seconds shared:DEBUG: executed C:/~src/Emscripten/emsdk/upstream/bin\llvm-nm.exe C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8_0.o system_libs:DEBUG: including libc (libc.a) system_libs:DEBUG: including libcompiler_rt (libcompiler_rt.a) system_libs:DEBUG: including libc++ (libc++-noexcept.a) system_libs:DEBUG: including libc++abi (libc++abi-noexcept.a) system_libs:DEBUG: including libmalloc (libdlmalloc.a) system_libs:DEBUG: including libpthread (libpthread_stub.a) system_libs:DEBUG: including libc_rt_wasm (libc_rt_wasm.a) system_libs:DEBUG: including libsockets (libsockets.a) emcc:DEBUG: emcc step "calculate system libraries" took 0.05 seconds emcc:DEBUG: linking: ['C:\\Users\\(my-user-name)\\AppData\\Local\\Temp\\emscripten_temp\\benchmark_utf8_0.o', '-LC:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\system\\local\\lib', '-LC:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\system\\lib', '-LC:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\cache\\wasm', 'C:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\cache\\wasm\\libc.a', 'C:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\cache\\wasm\\libcompiler_rt.a', 'C:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\cache\\wasm\\libc++-noexcept.a', 'C:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\cache\\wasm\\libc++abi-noexcept.a', 'C:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\cache\\wasm\\libdlmalloc.a', 'C:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\cache\\wasm\\libpthread_stub.a', 'C:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\cache\\wasm\\libc_rt_wasm.a', 'C:\\~src\\Emscripten\\emsdk\\upstream\\emscripten\\cache\\wasm\\libsockets.a'] shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/upstream/bin\wasm-ld.exe -o C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8_0.o -LC:\~src\Emscripten\emsdk\upstream\emscripten\system\local\lib -LC:\~src\Emscripten\emsdk\upstream\emscripten\system\lib -LC:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm\libc.a C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm\libcompiler_rt.a C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm\libc++-noexcept.a C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm\libc++abi-noexcept.a C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm\libdlmalloc.a C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm\libpthread_stub.a C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm\libc_rt_wasm.a C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm\libsockets.a -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --allow-undefined --import-memory --export-table --export main --export stackSave --export stackRestore --export stackAlloc --export __data_end --export __wasm_call_ctors --export fflush --export __errno_location --export malloc --export free -z stack-size=5242880 --initial-memory=16777216 --no-entry --max-memory=16777216 --global-base=1024 emcc:DEBUG: emcc step "link" took 0.05 seconds emcc:DEBUG: LLVM => JS building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-0-base.wasm shared:DEBUG: EM_CONFIG is located in C:\~src\Emscripten\emsdk\.emscripten wasm-sourcemap:DEBUG: Reading DWARF information from C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm wasm-sourcemap:DEBUG: Read sections index wasm-sourcemap:DEBUG: Saving to C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm.map wasm-sourcemap:DEBUG: Done shared:DEBUG: successfully executed C:\~src\Emscripten\emsdk\python\3.7.4-pywin32_64bit\python.exe C:\~src\Emscripten\emsdk\upstream\emscripten\tools\wasm-sourcemap.py C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm --dwarfdump=C:/~src/Emscripten/emsdk/upstream/bin\llvm-dwarfdump.exe -o C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm.map --basepath=C:\~src\Emscripten\play1\benchmarks\with-syms building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-1-base_wasm.map shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/upstream\bin\wasm-opt.exe --version shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/upstream\bin\wasm-emscripten-finalize --detect-features --minimize-wasm-changes --output-source-map-url=http://localhost:8080/benchmarks/with-syms/benchmark_utf8-wasm-with-semit-symbol-map.wasm.map -g --dyncalls-i64 --global-base=1024 --dwarf C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm -o C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm --input-source-map=C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm.map --output-source-map=C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm.map building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-2-wasm-emscripten-finalize.wasm building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-3-post_finalize.wasm building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-4-post_finalize.map emscripten:DEBUG: Metadata parsed: {'asmConsts': {'1024': ['{ var t0 = _emscripten_get_now(); var str = ' 'Module.UTF8ToString($0); var t1 = ' '_emscripten_get_now(); return (t1-t0); }', ['dii'], ['']]}, 'declares': ['emscripten_asm_const_double', '__assert_fail', 'time', 'emscripten_get_now', '__sys_open', 'fd_close', '__sys_fcntl64', '__sys_ioctl', 'fd_read', 'fd_write', 'abort', 'emscripten_resize_heap', 'emscripten_memcpy_big', 'setTempRet0', 'fd_seek'], 'emJsFuncs': {}, 'exports': ['__wasm_call_ctors', 'main', '__errno_location', 'fflush', 'free', 'malloc', 'stackSave', 'stackRestore', 'stackAlloc', 'dynCall_jiji'], 'externs': [], 'features': [], 'implementedFunctions': [], 'initializers': ['___wasm_call_ctors'], 'invokeFuncs': [], 'mainReadsParams': 1, 'namedGlobals': {'__data_end': '3848'}, 'simd': False, 'staticBump': 2824, 'tableSize': 9} emscripten:DEBUG: emscript: js compiler glue shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/node/12.18.1_64bit/bin/node.exe C:\~src\Emscripten\emsdk\upstream\emscripten\src\compiler.js C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\tmpmcwnsimc.txt emscripten:DEBUG: emscript: glue took 0.2664790153503418 seconds emscripten:DEBUG: stack_base: 5246736, stack_max: 3856, dynamic_base: 5246736, static bump: 2832 building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-5-original.js root:DEBUG: move: C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm -> C:\~src\Emscripten\play1\benchmarks\with-syms\benchmark_utf8-wasm-with-semit-symbol-map.wasm root:DEBUG: move: C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm.map -> C:\~src\Emscripten\play1\benchmarks\with-syms\benchmark_utf8-wasm-with-semit-symbol-map.wasm.map emcc:DEBUG: emcc step "emscript (llvm => executable code)" took 0.61 seconds emcc:DEBUG: setting up files shared:DEBUG: EM_CONFIG is located in C:\~src\Emscripten\emsdk\.emscripten utf8_corpus.txt C:\~src\Emscripten\play1\benchmarks\with-syms\utf8_corpus.txt C:\~src\Emscripten\play1\benchmarks\with-syms Packaging file "utf8_corpus.txt" to VFS in path "/utf8_corpus.txt". shared:DEBUG: successfully executed C:\~src\Emscripten\emsdk\python\3.7.4-pywin32_64bit\python.exe C:\~src\Emscripten\emsdk\upstream\emscripten\tools\file_packager.py benchmark_utf8-wasm-with-semit-symbol-map.data --from-emcc --export-name=Module --embed utf8_corpus.txt emcc:DEBUG: applying pre/postjses building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-6-pre-post.js emcc:DEBUG: emcc step "source transforms" took 0.19 seconds emcc:DEBUG: using binaryen building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-7-pre-byn.wasm shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/upstream\bin\wasm-opt --strip-dwarf --strip-producers benchmark_utf8-wasm-with-semit-symbol-map.wasm -o benchmark_utf8-wasm-with-semit-symbol-map.wasm -g --mvp-features --input-source-map=benchmark_utf8-wasm-with-semit-symbol-map.wasm.map --output-source-map=benchmark_utf8-wasm-with-semit-symbol-map.wasm.map building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-8-wasm-opt.wasm building:DEBUG: handle_final_wasm_symbols warning: no output file specified, not emitting output shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/upstream\bin\wasm-opt --print-function-map benchmark_utf8-wasm-with-semit-symbol-map.wasm --mvp-features building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-9-symbolmap.js building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-10-symbolmap.wasm emcc:DEBUG: emcc step "binaryen" took 0.08 seconds emcc:DEBUG: Private module export name substitution with Module building:DEBUG: saving debug copy C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\emcc-11-module_export_name_substitution.js root:DEBUG: move: C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\benchmark_utf8-wasm-with-semit-symbol-map.wasm.js.pp.js.module_export_name_substitution.js -> C:\~src\Emscripten\play1\benchmarks\with-syms\benchmark_utf8-wasm-with-semit-symbol-map.js emcc:DEBUG: generating HTML shared:DEBUG: successfully executed C:/~src/Emscripten/emsdk/node/12.18.1_64bit/bin/node.exe C:\~src\Emscripten\emsdk\upstream\emscripten\tools/preprocessor.js C:\Users\(my-user-name)\AppData\Local\Temp\emscripten_temp\settings.js shell.html emcc:DEBUG: emcc step "final emitting" took 0.16 seconds cache:DEBUG: PID 20208 released multiprocess file lock to Emscripten cache at C:\~src\Emscripten\emsdk\upstream\emscripten\cache\wasm emcc:DEBUG: total time: 2.14 seconds 2020 m. lapkričio 7 d., šeštadienis 16:49:35 UTC+2 Remigijus Pankevičius rašė: > Hi, > > I've copied 2 files benchmark_utf8.cpp and utf8_corpus.txt from Emscripten > test suite to a separate folder and I'm getting this strange warning when > compiling: > > Command: > emcc benchmark_utf8.cpp -s > "EXTRA_EXPORTED_RUNTIME_METHODS=['UTF8ToString']" --emit-symbol-map -o > benchmark_utf8-wasm-with-semit-symbol-map.html --embed-file utf8_corpus.txt > -g4 > > Output: > emcc:WARNING: Wasm source map won't be usable in a browser without > --source-map-base > warning: no output file specified, not emitting output > > > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. 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