Add nasm build. See compiler-explorer/infra#1102

Author: mattgodbolt

.github/workflows/build.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        image: ['misc', 'rocm', 'compcert', 'rust-cg-gcc', 'rust-linux', 'iwyu', 'lc3']
+        image: ['misc', 'rocm', 'compcert', 'rust-cg-gcc', 'rust-linux', 'iwyu', 'lc3', 'nasm']
     steps:
     - name: Docker Setup Buildx
       uses: docker/setup-buildx-action@v2

.idea/.gitignore

@@ -0,0 +1,14 @@
+FROM ubuntu:20.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt update -y -q && apt upgrade -y -q && apt update -y -q && \
+    apt install -y -q \
+    build-essential \
+    curl \
+    git
+
+RUN mkdir -p /root
+COPY nasm /root/
+COPY common.sh /root/
+
+WORKDIR /root

.idea/misc-builder.iml

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -ex
+source common.sh
+
+VERSION=$1
+
+URL=https://www.nasm.us/pub/nasm/releasebuilds/${VERSION}/nasm-${VERSION}.tar.xz
+
+FULLNAME=nasm-${VERSION}.tar.xz
+OUTPUT=$2/${FULLNAME}
+
+REVISION="nasm-${VERSION}"
+LAST_REVISION="${3:-}"
+
+initialise "${REVISION}" "${OUTPUT}" "${LAST_REVISION}"
+
+PREFIX=$(pwd)/prefix
+DIR=$(pwd)/build
+
+mkdir "${DIR}"
+cd "${DIR}"
+curl -sL "${URL}" | tar Jxf - --strip-components 1
+
+if [[ -e include/nasmlib.h ]]; then
+  sed -i 's/void pure_func seg_init(void);/void seg_init(void);/' include/nasmlib.h
+fi
+./configure "--prefix=${PREFIX}"
+make "-j$(nproc)" install
+
+complete "${PREFIX}" "nasm-${VERSION}" "${OUTPUT}"