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From de3c48d72ec7064e7f0522877fe759c729df0c50 Mon Sep 17 00:00:00 2001
From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Date: Wed, 25 Mar 2020 11:32:18 -0400
Subject: [PATCH] Allow using a system provided libgit2 library
Setting the USE_SYSTEM_LIBGIT2 Make or CMake variable (through the
BUILD_OPTIONS variable) to any value enables using the system library.
The default behavior of using a bundled copy of libgit2 is unchanged.
---
CMakeLists.txt | 9 +++++++--
Makefile | 11 +++++++++++
src/CMakeLists.txt | 9 +++++++--
3 files changed, 25 insertions(+), 4 deletions(-)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index a393d7c..75d6ca6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,9 +7,14 @@ set(BUILD_SHARED_LIBS OFF CACHE BOOL "shared" FORCE)
set(BUILD_CLAR OFF CACHE BOOL "clar" FORCE)
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -DEGIT_DEBUG")
-add_subdirectory(libgit2)
+if(USE_SYSTEM_LIBGIT2)
+ find_package(PkgConfig REQUIRED)
+ pkg_check_modules(git2 REQUIRED IMPORTED_TARGET libgit2)
+else()
+ add_subdirectory(libgit2)
+ find_library(git2 libgit2.a)
+endif()
-find_library(git2 libgit2.a)
add_subdirectory(src)
enable_testing()
diff --git a/Makefile b/Makefile
index 8199532..6a6a4e1 100644
--- a/Makefile
+++ b/Makefile
@@ -13,6 +13,13 @@ ifeq ($(UNAME),MSYS)
BUILD_OPTIONS+= -G "MSYS Makefiles"
endif
+# If the variable USE_SYSTEM_LIBGIT2 is set to *any* value, use the
+# system provided libgit2 library.
+USE_SYSTEM_LIBGIT2? := \
+ $(if $(or $(USE_SYSTEM_LIBGIT2),\
+ $(findstring USE_SYSTEM_LIBGIT2,$(BUILD_OPTIONS))),\
+ true)
+
ifeq "$(TRAVIS)" "true"
## Makefile for Travis ###################################################
#
@@ -87,7 +94,11 @@ submodule-update:
@git submodule update
libgit2:
+ifeq ($(USE_SYSTEM_LIBGIT2?),)
@git submodule update --init
+else
+ @echo "Using the system provided libgit2 library"
+endif
CLEAN = $(ELCS) $(PKG)-autoloads.el build
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index cfb5777..0dbad8a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -13,8 +13,13 @@ if(WIN32)
set_target_properties(egit2 PROPERTIES PREFIX lib)
endif(WIN32)
-target_link_libraries(egit2 git2)
-target_include_directories(egit2 SYSTEM PRIVATE "${libgit2_SOURCE_DIR}/include")
+if(USE_SYSTEM_LIBGIT2)
+ target_link_libraries(egit2 PRIVATE PkgConfig::git2)
+else()
+ target_link_libraries(egit2 git2)
+ target_include_directories(
+ egit2 SYSTEM PRIVATE "${libgit2_SOURCE_DIR}/include")
+endif()
if(CMAKE_COMPILER_IS_GNUCC)
target_compile_options(egit2 PRIVATE -Wall -Wextra)
--
2.26.2
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