From 27ae47117e59061da0894288e7b1e4880a6facca Mon Sep 17 00:00:00 2001
From: Ingvar Stepanyan <rreverser@google.com>
Date: Fri, 1 May 2020 16:42:41 +0100
Subject: [PATCH] Leverage make -j to parallelise C++ builds

We've been running each Make command in a single thread, resulting in fairly slow builds for C++ codecs.

This change instead runs all `make` invocations with `-j` defaulting to number of cores (retrieved via `nproc`).

On my machine Docker uses a VM configured to 4 cores out of 8 available. This change brings total build time for C++ codecs down from 10m28s to 7m5s (~3.5 minutes difference).

Note (1): I've converted imagequant builds to use built-in `make` as well to leverage this parallelisation and future-proof build script.
Note (2): we don't need to do the same for Rust, since Cargo parallelises builds by default.
---
 codecs/imagequant/build.sh        |  14 ++--
 codecs/imagequant/imagequant.js   | 110 +++++++++++++++---------------
 codecs/imagequant/imagequant.wasm | Bin 59715 -> 58576 bytes
 codecs/mozjpeg_enc/build.sh       |   2 +-
 codecs/webp_dec/build.sh          |   2 +-
 codecs/webp_enc/build.sh          |   2 +-
 6 files changed, 64 insertions(+), 66 deletions(-)

diff --git a/codecs/imagequant/build.sh b/codecs/imagequant/build.sh
index f9e7b45b..b2852655 100755
--- a/codecs/imagequant/build.sh
+++ b/codecs/imagequant/build.sh
@@ -11,12 +11,9 @@ echo "============================================="
 echo "Compiling libimagequant"
 echo "============================================="
 (
-  emcc \
-    ${OPTIMIZE} \
-    -I node_modules/libimagequant \
-    --std=c99 \
-    -c \
-    node_modules/libimagequant/{libimagequant,pam,mediancut,blur,mempool,kmeans,nearest}.c
+  cd node_modules/libimagequant
+  emconfigure ./configure --disable-sse
+  emmake make static -j`nproc`
 )
 echo "============================================="
 echo "Compiling wasm module"
@@ -31,9 +28,10 @@ echo "============================================="
     -s 'EXPORT_NAME="imagequant"' \
     -I node_modules/libimagequant \
     -o ./imagequant.js \
-    --std=c++11 *.o \
+    --std=c++11 \
     -x c++ \
-    imagequant.cpp
+    imagequant.cpp \
+    node_modules/libimagequant/libimagequant.a
 )
 echo "============================================="
 echo "Compiling wasm module done"
diff --git a/codecs/imagequant/imagequant.js b/codecs/imagequant/imagequant.js
index 6ff3c366..c4506d11 100644
--- a/codecs/imagequant/imagequant.js
+++ b/codecs/imagequant/imagequant.js
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diff --git a/codecs/imagequant/imagequant.wasm b/codecs/imagequant/imagequant.wasm
index f6ececd3354ba84df154413a2c229f993c491824..0c0d0863fceb8f6f7104eec450130290aa595727 100644
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diff --git a/codecs/mozjpeg_enc/build.sh b/codecs/mozjpeg_enc/build.sh
index 3388aaa0..702a85aa 100755
--- a/codecs/mozjpeg_enc/build.sh
+++ b/codecs/mozjpeg_enc/build.sh
@@ -17,7 +17,7 @@ echo "============================================="
   cd node_modules/mozjpeg
   autoreconf -fiv
   emconfigure ./configure --without-simd
-  emmake make libjpeg.la
+  emmake make libjpeg.la -j`nproc`
 )
 echo "============================================="
 echo "Compiling mozjpeg done"
diff --git a/codecs/webp_dec/build.sh b/codecs/webp_dec/build.sh
index f9d4ab1d..ca4e7e57 100755
--- a/codecs/webp_dec/build.sh
+++ b/codecs/webp_dec/build.sh
@@ -31,7 +31,7 @@ test -n "$SKIP_LIBWEBP" || (
     --disable-neon \
     --disable-sse2 \
     --disable-sse4.1
-  emmake make
+  emmake make -j`nproc`
 )
 echo "============================================="
 echo "Compiling wasm bindings"
diff --git a/codecs/webp_enc/build.sh b/codecs/webp_enc/build.sh
index 01f78913..b76afe53 100755
--- a/codecs/webp_enc/build.sh
+++ b/codecs/webp_enc/build.sh
@@ -32,7 +32,7 @@ test -n "$SKIP_LIBWEBP" || (
     --disable-neon \
     --disable-sse2 \
     --disable-sse4.1
-  emmake make
+  emmake make -j`nproc`
 )
 echo "============================================="
 echo "Compiling wasm bindings"