Support pkg-config (#253)

+name: pkg-config
+
+on:
+  push:
+    branches:
+      - master
+      - pkg-config
+    tags:
+      - '*'
+    paths:
+      - '.github/workflows/pkg-config.yaml'
+      - 'CMakeLists.txt'
+      - 'cmake/**'
+      - 'sherpa-onnx/csrc/*'
+      - 'sherpa-onnx/c-api/*'
+      - 'c-api-examples/**'
+  pull_request:
+    branches:
+      - master
+    paths:
+      - '.github/workflows/pkg-config.yaml'
+      - 'CMakeLists.txt'
+      - 'cmake/**'
+      - 'sherpa-onnx/csrc/*'
+      - 'sherpa-onnx/c-api/*'
+
+  workflow_dispatch:
+
+concurrency:
+  group: pkg-config-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  linux:
+    runs-on: ${{ matrix.os }}
+    name: ${{ matrix.os }} ${{ matrix.build_type }} ${{ matrix.lib_type }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        build_type: [Release, Debug]
+        lib_type: [shared, static]
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Configure CMake
+        shell: bash
+        run: |
+          mkdir build
+          cd build
+          if [[ ${{ matrix.lib_type }} == "shared" ]]; then
+            cmake -DSHERPA_ONNX_ENABLE_C_API=ON -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCMAKE_INSTALL_PREFIX=./install -DBUILD_SHARED_LIBS=ON ..
+          else
+            cmake -DSHERPA_ONNX_ENABLE_C_API=ON -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCMAKE_INSTALL_PREFIX=./install -DBUILD_SHARED_LIBS=OFF ..
+          fi
+
+      - name: Build sherpa-onnx for ${{ matrix.os }} ${{ matrix.build_type }} ${{ matrix.lib_type }}
+        shell: bash
+        run: |
+          cd build
+          make -j2
+          make install
+
+          ls -lh lib
+          ls -lh bin
+
+      - name: Install tree
+        if: matrix.os == 'ubuntu-latest'
+        shell: bash
+        run: |
+          sudo apt-get install tree
+
+      - name: Install tree
+        if: matrix.os == 'macos-latest'
+        shell: bash
+        run: |
+          brew install tree
+
+      - name: Display generated files of sherpa-onnx for ${{ matrix.os }} ${{ matrix.build_type }} ${{ matrix.lib_type }}
+        shell: bash
+        run: |
+          tree build/install
+          ls -lh build/install
+
+          cat build/install/sherpa-onnx.pc
+
+      - name: Build C API example
+        shell: bash
+        run: |
+          export PKG_CONFIG_PATH=$PWD/build/install:$PKG_CONFIG_PATH
+          cd c-api-examples
+          gcc -o decode-file-c-api $(pkg-config --cflags sherpa-onnx) ./decode-file-c-api.c $(pkg-config --libs sherpa-onnx)
+          ./decode-file-c-api --help
+
+      - name: Test online transducer (C API)
+        shell: bash
+        run: |
+          export PATH=$PWD/c-api-examples:$PATH
+          export EXE=decode-file-c-api
+
+          .github/scripts/test-online-transducer.sh

 cmake_minimum_required(VERSION 3.13 FATAL_ERROR)
 project(sherpa-onnx)
 
-set(SHERPA_ONNX_VERSION "1.7.0")
+set(SHERPA_ONNX_VERSION "1.7.1")
 
 # Disable warning about
 #
@@ -167,3 +167,22 @@ if(SHERPA_ONNX_ENABLE_C_API)
   add_subdirectory(c-api-examples)
 endif()
 message(STATUS "CMAKE_CXX_FLAGS: ${CMAKE_CXX_FLAGS}")
+
+if(NOT BUILD_SHARED_LIBS)
+  if(APPLE)
+    set(SHERPA_ONNX_PKG_CONFIG_EXTRA_LIBS "-lc++")
+  endif()
+
+  if(UNIX AND NOT APPLE)
+    set(SHERPA_ONNX_PKG_CONFIG_EXTRA_LIBS "-lstdc++ -lm")
+  endif()
+endif()
+
+# See https://people.freedesktop.org/~dbn/pkg-config-guide.html
+configure_file(cmake/sherpa-onnx.pc.in ${PROJECT_BINARY_DIR}/sherpa-onnx.pc @ONLY)
+install(
+  FILES
+    ${PROJECT_BINARY_DIR}/sherpa-onnx.pc
+  DESTINATION
+    .
+)

@@ -2,10 +2,11 @@ function(download_cargs)
   include(FetchContent)
 
   set(cargs_URL "https://github.com/likle/cargs/archive/refs/tags/v1.0.3.tar.gz")
+  set(cargs_URL2 "https://huggingface.co/csukuangfj/sherpa-onnx-cmake-deps/resolve/main/cargs-1.0.3.tar.gz")
   set(cargs_HASH "SHA256=ddba25bd35e9c6c75bc706c126001b8ce8e084d40ef37050e6aa6963e836eb8b")
 
   # If you don't have access to the Internet,
-  # please pre-download asio
+  # please pre-download cargs
   set(possible_file_locations
     $ENV{HOME}/Downloads/cargs-1.0.3.tar.gz
     ${PROJECT_SOURCE_DIR}/cargs-1.0.3.tar.gz
@@ -19,11 +20,18 @@ function(download_cargs)
       set(cargs_URL  "${f}")
       file(TO_CMAKE_PATH "${cargs_URL}" cargs_URL)
       message(STATUS "Found local downloaded cargs: ${cargs_URL}")
+      set(cargs_URL2)
       break()
     endif()
   endforeach()
 
-  FetchContent_Declare(cargs URL ${cargs_URL} URL_HASH ${cargs_HASH})
+  FetchContent_Declare(cargs
+    URL
+      ${cargs_URL}
+      ${cargs_URL2}
+    URL_HASH
+      ${cargs_HASH}
+  )
 
   FetchContent_GetProperties(cargs)
   if(NOT cargs_POPULATED)
@@ -32,6 +40,11 @@ function(download_cargs)
   endif()
   message(STATUS "cargs is downloaded to ${cargs_SOURCE_DIR}")
   add_subdirectory(${cargs_SOURCE_DIR} ${cargs_BINARY_DIR} EXCLUDE_FROM_ALL)
+
+  install(TARGETS cargs DESTINATION lib)
+  install(FILES ${cargs_SOURCE_DIR}/include/cargs.h
+    DESTINATION include
+  )
 endfunction()
 
 download_cargs()

@@ -57,6 +57,9 @@ function(download_portaudio)
 
   if(BUILD_SHARED_LIBS)
     set_target_properties(portaudio PROPERTIES OUTPUT_NAME "sherpa-onnx-portaudio")
+    if(NOT WIN32)
+      target_compile_options(portaudio PRIVATE "-Wno-deprecated-declarations")
+    endif()
 
     if(SHERPA_ONNX_ENABLE_PYTHON AND WIN32)
       install(TARGETS portaudio DESTINATION ..)
@@ -65,6 +68,9 @@ function(download_portaudio)
     endif()
   else()
     set_target_properties(portaudio_static PROPERTIES OUTPUT_NAME "sherpa-onnx-portaudio_static")
+    if(NOT WIN32)
+      target_compile_options(portaudio_static PRIVATE "-Wno-deprecated-declarations")
+    endif()
     if(SHERPA_ONNX_ENABLE_PYTHON AND WIN32)
       install(TARGETS portaudio_static DESTINATION ..)
     else()

+prefix="@CMAKE_INSTALL_PREFIX@"
+exec_prefix="${prefix}"
+includedir="${prefix}/include"
+libdir="${exec_prefix}/lib"
+
+Name: sherpa-onnx
+Description: pkg-config for sherpa-onnx
+URL: https://github.com/k2-fsa/sherpa-onnx
+
+Version: @SHERPA_ONNX_VERSION@
+Cflags: -I"${includedir}"
+
+# Note: -lcargs is required only for the following file
+# https://github.com/k2-fsa/sherpa-onnx/blob/master/c-api-examples/decode-file-c-api.c
+# We add it here so that users don't need to specify -lcargs when compiling decode-file-c-api.c
+Libs: -L"${libdir}" -lsherpa-onnx-c-api -lsherpa-onnx-core -lonnxruntime -lkaldi-native-fbank-core -lcargs -Wl,-rpath,${libdir} @SHERPA_ONNX_PKG_CONFIG_EXTRA_LIBS@

@@ -82,13 +82,17 @@ def process_windows(s):
         "sherpa-onnx-c-api.dll",
         "sherpa-onnx-core.dll",
     ]
+
+    version = get_version()
+
     prefix1 = f"{SHERPA_ONNX_DIR}/windows/sherpa_onnx/lib/"
     prefix2 = f"{SHERPA_ONNX_DIR}/windows/sherpa_onnx/"
     prefix3 = f"{SHERPA_ONNX_DIR}/windows/"
+    prefix4 = f"{SHERPA_ONNX_DIR}/windows/sherpa_onnx-${version}.data/data/bin/"
 
     lib_list = []
     for lib in libs:
-        for prefix in [prefix1, prefix2, prefix3]:
+        for prefix in [prefix1, prefix2, prefix3, prefix4]:
             f = Path(prefix) / lib
             if f.is_file():
                 lib_list.append(str(f))

@@ -4,7 +4,7 @@
 // Copyright      2023  Xiaomi Corporation
 #ifndef SHERPA_ONNX_CSRC_TEXT_UTILS_H_
 #define SHERPA_ONNX_CSRC_TEXT_UTILS_H_
-#include <errno.h>.
+#include <errno.h>
 #include <stdlib.h>
 
 #include <limits>