Initial

.clang-format

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+BasedOnStyle: LLVM
+IndentWidth: 4
+TabWidth: 4
+UseTab: Never
+ColumnLimit: 120
+AllowShortLoopsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: false
+AlwaysBreakTemplateDeclarations: true
+BreakConstructorInitializers: BeforeComma
+AlignConsecutiveDeclarations:
+  Enabled:         true 
+  AcrossEmptyLines: false
+  AcrossComments:  false
+  AlignCompound:   false
+  AlignFunctionPointers: false
+  PadOperators:    false
+AlignConsecutiveMacros: true
+AllowShortCaseLabelsOnASingleLine: true
+SeparateDefinitionBlocks: Always

.gitignore

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+build

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15)
+
+project(add_project
+    VERSION 1.0.0
+    LANGUAGES C
+)
+
+include(GNUInstallDirs)
+
+add_subdirectory(libadd)
+add_subdirectory(app)

app/CMakeLists.txt

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+add_executable(add_app
+    main.c
+)
+
+target_link_libraries(add_app
+    PRIVATE add::add
+)
+
+install(TARGETS add_app
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)

app/main.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+#include <add/add.h>
+
+int main(int argc, char **argv) {
+    if (argc != 3) {
+        fprintf(stderr, "usage: %s <a> <b>\n", argv[0]);
+        return 1;
+    }
+
+    int a = atoi(argv[1]);
+    int b = atoi(argv[2]);
+
+    printf("%d\n", add(a, b));
+    return 0;
+}

libadd/CMakeLists.txt

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+add_library(add_shared SHARED
+    src/add.c
+)
+
+add_library(add_static STATIC
+    src/add.c
+)
+
+target_include_directories(add_shared
+    PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
+
+target_include_directories(add_static
+    PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
+
+set_target_properties(add_shared PROPERTIES
+    OUTPUT_NAME add
+    VERSION ${PROJECT_VERSION}
+    SOVERSION ${PROJECT_VERSION_MAJOR}
+)
+
+set_target_properties(add_static PROPERTIES
+    OUTPUT_NAME add
+)
+
+add_library(add::add ALIAS add_shared)

libadd/addConfig.cmake.in

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+@PACKAGE_INIT@
+
+include("${CMAKE_CURRENT_LIST_DIR}/addTargets.cmake")

libadd/include/add/add.h

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+#ifndef ADD_ADD_H
+#define ADD_ADD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int add(int a, int b);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ADD_ADD_H */

libadd/src/add.c

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+#include <add/add.h>
+
+int add(int a, int b) {
+    return a + b;
+}