Add detection of used Linux distribution.

This information is then used to put the bash completion files into the right directory.

CMakeLists.txt

@@ -20,6 +20,11 @@ math(EXPR LDC_LLVM_VER ${LLVM_VERSION_MAJOR}*100+${LLVM_VERSION_MINOR})
 #
 find_package(LibConfig++ REQUIRED)
 
+#
+# Get info about used Linux distribution.
+#
+include(GetLinuxDistribution)
+
 #
 # Main configuration.
 #
@@ -431,5 +436,9 @@ install(FILES ${PROJECT_BINARY_DIR}/bin/${LDC_EXE}_install.conf DESTINATION ${CO
 install(FILES ${PROJECT_BINARY_DIR}/bin/${LDC_EXE}_install.rebuild.conf DESTINATION ${CONF_INST_DIR} RENAME ${LDC_EXE}.rebuild.conf)
 
 if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
-    install(DIRECTORY bash_completion.d DESTINATION ${CONF_INST_DIR})
+    set(BASH_COMPLETION_INST_DIR "${CONF_INST_DIR}/bash_completion.d")
+    if(LINUX_DISTRIBUTION_IS_GENTOO)
+        set(BASH_COMPLETION_INST_DIR "/usr/share/bash-completion")
+    endif()
+    install(DIRECTORY bash_completion.d/ DESTINATION ${BASH_COMPLETION_INST_DIR})
 endif()

cmake/Modules/GetLinuxDistribution.cmake

@@ -0,0 +1,20 @@
+# Gets the linux distribution
+#
+# This module defines:
+# LINUX_DISTRIBUTION_IS_REDHAT
+# LINUX_DISTRIBUTION_IS_GENTOO
+
+# Check: Can /usr/bin/lsb_release -a be used?
+
+set(LINUX_DISTRIBUTION_IS_REDHAT FALSE)
+set(LINUX_DISTRIBUTION_IS_GENTOO FALSE)
+
+if (UNIX)
+    if (EXISTS "/etc/redhat-release")
+        set(LINUX_DISTRIBUTION_IS_REDHAT TRUE)
+    endif()
+
+    if (EXISTS "/etc/gentoo-release")
+        set(LINUX_DISTRIBUTION_IS_GENTOO TRUE)
+    endif()
+endif()