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<div id="projectname">Hardware Locality (hwloc)<span id="projectnumber"> 2.12.2</span>
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<div class="headertitle"><div class="title">Compiling software on top of hwloc's C API</div></div>
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<div class="textblock"><p>A program using the hwloc C API (for instance with <code>hwloc-hello.c</code> presented in <a class="el" href="index.html#interface_example">API Example</a>) may be built with standard development tools. <code>pkg-config</code> provides easy ways to retrieve the required compiler and linker flags as described below, but it is not mandatory.</p>
<h1><a class="anchor" id="useapi_gnumake"></a>
Compiling on top of hwloc's C API with GNU Make</h1>
<p>Here's an example of Makefile for building <code>hwloc-hello.c</code> with GNU Make:</p>
<pre class="fragment">CFLAGS += $(shell pkg-config --cflags hwloc)
LDLIBS += $(shell pkg-config --libs hwloc)
hwloc-hello: hwloc-hello.c
$(CC) hwloc-hello.c $(CFLAGS) -o hwloc-hello $(LDLIBS)
</pre><h1><a class="anchor" id="useapi_cmake"></a>
Compiling on top of hwloc's C API with CMake</h1>
<p>Here's an example de <code>CMakeLists.txt</code> which shows variables obtained from <code>pkg-config</code> and how to use them:</p>
<pre class="fragment">cmake_minimum_required(VERSION 3.6)
project(TEST_HWLOC C)
include(FindPkgConfig)
if(PKG_CONFIG_FOUND)
pkg_search_module(HWLOC REQUIRED IMPORTED_TARGET hwloc)
else(PKG_CONFIG_FOUND)
message(FATAL_ERROR "FindHWLOC needs pkg-config program and PKG_CONFIG_PATH must contain the path to hwloc.pc file.")
endif(PKG_CONFIG_FOUND)
add_executable(hwloc-hello hwloc-hello.c)
target_link_libraries(hwloc-hello PRIVATE PkgConfig::HWLOC)
</pre><p>The project may be built with: </p><pre class="fragment">cmake -B build
cmake --build build --verbose
</pre><p>The built binary is then available under <code>build/hwloc-hello</code>. </p>
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