[BUILD] remove the build requirement for an unused C++ compiler

This patch sets the programming languages of each CMake project to C. With
this change, CMake does not search for an unused C++ compiler anymore.

11 files changed, 20 insertions, 12 deletions

diff --git a/README.md b/README.md
index 4f00d7a..aae3426 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,6 @@ apt-get install git \
                 make \
                 cmake \
                 gcc \
-                g++ \
                 linux-headers-generic \
 				libfuse-dev \
 				libjansson-dev \
@@ -57,7 +56,6 @@ yum install git \
             make \
             cmake \
             gcc \
-            gcc-c++ \
             kernel-devel \
             elfutils-libelf-devel \
 			fuse-devel \
diff --git a/pkg/CMakeLists.txt b/pkg/CMakeLists.txt
index 3112696..3060345 100644
--- a/pkg/CMakeLists.txt
+++ b/pkg/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-pkg)
+project(dnbd3-pkg
+        LANGUAGES C)
 
 add_subdirectory(config)
 add_subdirectory(systemd)
diff --git a/pkg/config/CMakeLists.txt b/pkg/config/CMakeLists.txt
index 1d553db..efbd2bf 100644
--- a/pkg/config/CMakeLists.txt
+++ b/pkg/config/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-config)
+project(dnbd3-config
+        LANGUAGES C)
 
 # define all configuration files
 set(DNBD3_CONFIG_FILES ${CMAKE_CURRENT_SOURCE_DIR}/alt-servers
diff --git a/pkg/systemd/CMakeLists.txt b/pkg/systemd/CMakeLists.txt
index d1e5087..b094b4b 100644
--- a/pkg/systemd/CMakeLists.txt
+++ b/pkg/systemd/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-systemd)
+project(dnbd3-systemd
+        LANGUAGES C)
 
 # define all systemd related files
 set(DNBD3_SYSTEMD_FILES ${CMAKE_CURRENT_SOURCE_DIR}/dnbd3-server.service)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d0c61c5..1a7d583 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-src)
+project(dnbd3-src
+        LANGUAGES C)
 
 add_subdirectory(bench)
 if(DNBD3_KERNEL_MODULE)
diff --git a/src/bench/CMakeLists.txt b/src/bench/CMakeLists.txt
index 59a5ef8..4e2becf 100644
--- a/src/bench/CMakeLists.txt
+++ b/src/bench/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-bench)
+project(dnbd3-bench
+        LANGUAGES C)
 
 # add compile option to enable enhanced POSIX pthread features
 add_definitions(-D_GNU_SOURCE)
diff --git a/src/client/CMakeLists.txt b/src/client/CMakeLists.txt
index c219740..b29825f 100644
--- a/src/client/CMakeLists.txt
+++ b/src/client/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-client)
+project(dnbd3-client
+        LANGUAGES C)
 
 # suppress -Wmultichar warnings
 add_compile_options(-Wno-multichar)
diff --git a/src/fuse/CMakeLists.txt b/src/fuse/CMakeLists.txt
index 4944a87..e0b6e43 100644
--- a/src/fuse/CMakeLists.txt
+++ b/src/fuse/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-fuse)
+project(dnbd3-fuse
+        LANGUAGES C)
 
 # add compile option to enable enhanced POSIX pthread features
 add_definitions(-D_GNU_SOURCE)
diff --git a/src/kernel/CMakeLists.txt b/src/kernel/CMakeLists.txt
index a7d7e5e..0f5a4bd 100644
--- a/src/kernel/CMakeLists.txt
+++ b/src/kernel/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-kernel)
+project(dnbd3-kernel
+        LANGUAGES C)
 
 # include macros to define Linux kernel build targets
 include(Kernel)
diff --git a/src/server/CMakeLists.txt b/src/server/CMakeLists.txt
index de2a550..ff8009f 100644
--- a/src/server/CMakeLists.txt
+++ b/src/server/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-server)
+project(dnbd3-server
+        LANGUAGES C)
 
 # find Jansson package required by the dnbd3-server
 find_package(Jansson)
diff --git a/src/shared/CMakeLists.txt b/src/shared/CMakeLists.txt
index f42b49f..6356399 100644
--- a/src/shared/CMakeLists.txt
+++ b/src/shared/CMakeLists.txt
@@ -1,7 +1,8 @@
 cmake_minimum_required(VERSION 3.10)
 
 # set the project name
-project(dnbd3-shared)
+project(dnbd3-shared
+        LANGUAGES C)
 
 # add compile option to get POLLRDHUP support for signals
 add_definitions(-D_GNU_SOURCE)