How rawlab.wasm was built
=========================

Toolchain: emcc 6.0.6 (ce75e06884093bcefb86a6b8fd56a5d62a4cc245)
Source:    libraw-0.22.2.tar.gz, sha256 de86b035655accff8d4010f1a221fdf50d353cb7b1422ba26f14a0db92612cfa
Artifact:  rawlab.wasm, sha256 eacf21cbf5dc6a50b60eecdf8ef9cd5aaae5e0c84867cdf6caa232fbe95ee7ba
           803417 bytes

The source list is derived from LibRaw's own lib_libraw_a_SOURCES in
Makefile.am (78 translation units) by srcs.sh, not from find(1): the
tree carries src/**/*_ph.cpp placeholder units that #include their
siblings and produce 13 duplicate symbols at link time.

Command: see build-wasm.sh, reproduced here verbatim.

    #!/bin/sh
    # Build LibRaw 0.22.2 + our wrapper into ONE standalone .wasm with no generated
    # JS glue. The loader that goes with it is hand-written (loader.mjs, ~150 lines)
    # and stubs the handful of WASI imports the C++ runtime references.
    #
    # CDDL NOTE. This script is the record of exactly what went into the artifact
    # and is published alongside LibRaw-0.22.2.tar.gz and the patch series. If you
    # change a define here, the published source description is wrong until you
    # change it here too.
    set -eu
    cd "$(dirname "$0")"
    . ./emsdk/emsdk_env.sh >/dev/null 2>&1
    
    LR=LibRaw-0.22.2
    OUT=build-wasm
    OBJ=$OUT/obj
    mkdir -p "$OBJ"
    
    for p in LibRaw-demosaic-pack-GPL2 LibRaw-demosaic-pack-GPL3; do
      if [ -e "$LR/$p" ]; then echo "FATAL: GPL demosaic pack present: $p" >&2; exit 1; fi
    done
    
    SRCS=$(./srcs.sh "$LR")
    
    DEFS="-DLIBRAW_NOTHREADS -DUSE_ZLIB -DUSE_JPEG -DNO_LCMS"
    FLAGS="-O3 -std=c++17 -w $DEFS -I$LR --use-port=zlib --use-port=libjpeg -fwasm-exceptions"
    
    n=0
    for s in $SRCS; do
      o="$OBJ/$(echo "$s" | tr / _).o"
      if [ -f "$o" ] && [ "$o" -nt "$s" ]; then continue; fi
      emcc $FLAGS -c "$s" -o "$o" &
      n=$((n + 1))
      [ $((n % 8)) -eq 0 ] && wait
    done
    wait
    
    emcc $FLAGS -c wrapper/rawlab.cpp -o "$OBJ/rawlab.o"
    
    EXPORTS='_rl_alloc,_rl_free,_rl_open,_rl_unpack,_rl_thumb,_rl_close,_rl_i32,_rl_f32,_rl_str,_rl_xtrans,_rl_raw_ptr,_rl_raw_len,_rl_rawN_ptr,_rl_fcol,_rl_thumb_ptr,_rl_thumb_len,_rl_thumb_count,_rl_thumb_info,_rl_bin2x2,_rl_bin3x3,_rl_bilinear,_rl_xtrans_audit,_rl_out_ptr,_rl_out_len,_rl_last_error,_rl_strerror,_rl_version,_rl_heap_size,_rl_preview_decode,_rl_preview_ptr,_rl_preview_w,_rl_preview_h,_rl_preview_c,_rl_thumb_ex,_rl_thumb_pick,_rl_out_fnv,_rl_raw_fnv,_rl_black_at,_rl_cblack'
    
    em++ -O3 -fwasm-exceptions \
      --use-port=zlib --use-port=libjpeg \
      -sSTANDALONE_WASM=1 --no-entry \
      -sALLOW_MEMORY_GROWTH=1 -sINITIAL_MEMORY=33554432 -sMAXIMUM_MEMORY=4294967296 \
      -sEXPORTED_FUNCTIONS="$EXPORTS" \
      -sERROR_ON_UNDEFINED_SYMBOLS=1 \
      -o "$OUT/rawlab.wasm" "$OBJ"/*.o
    
    ls -l "$OUT/rawlab.wasm"
    shasum -a 256 "$OUT/rawlab.wasm"
    gzip -9 -c "$OUT/rawlab.wasm" | wc -c | sed 's/^/gzipped bytes: /'