Add Alpine Linux build

.github/workflows/alpine-build.yml

@@ -0,0 +1,55 @@
+name: Alpine build
+
+on:
+  push:
+    branches: [ master ]
+    paths-ignore:
+      - '.github/workflows/macos-build.yml'
+      - '.github/workflows/ubuntu-build.yml'
+      - '.github/workflows/ubuntu-aarch64.yml'
+      - '.github/workflows/windows-build.yml'
+  pull_request:
+  workflow_dispatch:
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  Alpine-build:
+    runs-on: ubuntu-latest
+    container:
+      image: alpine:latest
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        submodules: recursive
+
+    - name: Install packages
+      run: |
+        apk --no-cache --upgrade add build-base clang cmake libxml2-dev \
+          libxml2-utils libpng-dev freetype-dev fontconfig-dev git valgrind
+
+    - name: Configure CMake
+      env:
+        CC: gcc
+        CXX: g++
+      run: |
+        cmake -B ${{github.workspace}} \
+          -DVCPKG_TARGET_TRIPLET=x86_64-alpine-linux-musl
+          -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
+
+    - name: Build
+      run: cmake --build ${{github.workspace}} --config ${{env.BUILD_TYPE}}
+
+    - name: Test well formed files
+      working-directory: ${{github.workspace}}
+      run: ./tests/resources/check_correctness.sh -r -s
+
+    - name: Test corrupted files
+      working-directory: ${{github.workspace}}
+      run: ./tests/resources/check_correctness.sh -r -s -e tests/resources/emf-corrupted/ -xN
+
+    - name: Test EA files
+      working-directory: ${{github.workspace}}
+      run: ./tests/resources/check_correctness.sh -r -s -e tests/resources/emf-ea/

.github/workflows/macos-build.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches: [ master ]
     paths-ignore:
+      - '.github/workflows/alpine-build.yml'
       - '.github/workflows/ubuntu-build.yml'
       - '.github/workflows/ubuntu-aarch64.yml'
       - '.github/workflows/windows-build.yml'

.github/workflows/ubuntu-aarch64.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches: [ master ]
     paths-ignore:
+      - '.github/workflows/alpine-build.yml'
       - '.github/workflows/ubuntu-build.yml'
       - '.github/workflows/macos-build.yml'
       - '.github/workflows/windows-build.yml'

.github/workflows/ubuntu-build.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches: [ master ]
     paths-ignore:
+      - '.github/workflows/alpine-build.yml'
       - '.github/workflows/macos-build.yml'
       - '.github/workflows/ubuntu-aarch64.yml'
       - '.github/workflows/windows-build.yml'

.github/workflows/windows-build.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches: [ master ]
     paths-ignore:
+      - '.github/workflows/alpine-build.yml'
       - '.github/workflows/macos-build.yml'
       - '.github/workflows/ubuntu-aarch64.yml'
       - '.github/workflows/ubuntu-build.yml'

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "vcpkg"]
 	path = vcpkg
-	url = git@github.com:microsoft/vcpkg.git
+	url = https://github.com/microsoft/vcpkg.git

CMakeLists.txt

@@ -29,8 +29,9 @@ if(VCPKG_TARGET_TRIPLET)
   endif(EXISTS ${PLATFORM_TOOLCHAIN})
 endif(VCPKG_TARGET_TRIPLET)
 
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")
-
+if(${VCPKG_TARGET_TRIPLET} MATCHES "-alpine-linux-")
+set(ALPINE "Alpine")
+endif(${VCPKG_TARGET_TRIPLET} MATCHES "-alpine-linux-")
 
 find_package(PNG REQUIRED)
 find_package(Freetype REQUIRED)
@@ -137,11 +138,16 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
   add_definitions(-DDARWIN)
 endif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 
-# Find/build external dependancies if it is Microsoft Visual Studio build
+# Find/build external dependencies if it is Microsoft Visual Studio build
 if(MSVC)
   find_package(Iconv REQUIRED)
   set(EXTERNAL_ICONV ${Iconv_LIBRARY})
+endif(MSVC)
 
+# Locate fontconfig, somehow the find_package call can't find it?
+include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/FindFontconfig.cmake)
+
+if(MSVC OR ALPINE)
   set(ARGP_NAME argp${EXTERNAL_LIB_DIR_SUFFIX})
   ExternalProject_Add(${ARGP_NAME}
     PREFIX ${DEPS}
@@ -151,7 +157,9 @@ if(MSVC)
     PATCH_COMMAND cd ${DEPS}/src/${ARGP_NAME} && git restore CMakeLists.txt && git apply ${PATCHES}/argp/CMakeLists.txt.patch
   )
   set(EXTERNAL_ARGP "argp-standalone")
-endif(MSVC)
+endif(MSVC OR ALPINE)
+
+add_compile_options(-fPIC)
 
 # headers & library directories
 if(MSVC)
@@ -228,16 +236,17 @@ target_link_libraries(emf2svg
 )
 
 add_dependencies(emf2svg ${FMEM_NAME})
-if(MSVC)
+if(MSVC OR ALPINE)
   add_dependencies(emf2svg ${ARGP_NAME})
-endif(MSVC)
+endif(MSVC OR ALPINE)
 
 # Compile the executable
 add_executable(emf2svg-conv src/conv/emf2svg.cpp)
 
 target_link_libraries(emf2svg-conv
     emf2svg
     ${EXTERNAL_ARGP}
+    "fontconfig"
 )
 
 if(GCOV)

README.md

@@ -50,16 +50,22 @@ apt-get install cmake pkg-config
 apt-get install libpng-dev libc6-dev libfontconfig1-dev libfreetype6-dev zlib1g-dev
 ```
 
-Installing the dependencies on OS X:
+Installing the dependencies on macOS:
 ```bash
-$ brew install argp-standalone
+$ brew install argp-standalone cmake libpng freetype fontconfig gcc
 ```
 
 Installing the dependencies on RHEL/CentOS/Fedora:
 ```bash
 yum install cmake libpng-devel freetype-devel fontconfig-devel gcc-c++ gcc
 ```
 
+Installing the dependencies on Alpine Linux:
+```bash
+apk --no-cache --upgrade add build-base clang cmake libxml2-dev \
+  libxml2-utils libpng-dev freetype-dev fontconfig-dev git
+```
+
 Installing the dependencies on Windows for MSVC native builds
 Dependencies are installed by vcpkg package manager. Installation is implemented as a step of CMake configuration procedure.
 
@@ -225,11 +231,11 @@ EMF+ RECORDS:
 ChangeLogs
 ----------
 
-1.3.1: 
+1.3.1:
 
 * add MSVC 17 (2022) support
 
-1.3.0: 
+1.3.0:
 
 * add MSVC Windows native build