Add prefix-map compile options

GCC starting with version 8 supports a flag called -fmacro-prefix-map
that allows you to remap source paths. This will affect the __FILE__
macro.
This patch remaps the core directory to . so we leak fewer build system
paths into the final binaries.

This patch also adds -fdebug-prefix-map parameter to the compiler calls.
This is usually something you want which is why it is enabled by
default (and maps the same was as -fmacro-prefix-map).
To disable the behaviour the new cmake option DEBUG_PREFIX_MAP has been
added. This can be set to NO to disable remapping of debug source paths.

The patch also disables DEBUG_PREFIX_MAP for RPM and DEB builds, because
these build systems rewrite the paths themselves and thus need them
unchanged.

core/CMakeLists.txt

@@ -48,6 +48,7 @@ if (${CMAKE_SYSTEM_NAME} MATCHES "SunOS")
   set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 endif()
 
+include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
 CHECK_CXX_COMPILER_FLAG(-Wsuggest-override compiler_will_suggest_override)
 
@@ -65,6 +66,23 @@ if (${compiler_error_format_security})
    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=format-security")
 endif()
 
+option(DEBUG_PREFIX_MAP "remap absolute debug paths to relative if compiler supports it" ON)
+CHECK_C_COMPILER_FLAG(-fdebug-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=. c_compiler_debug_prefix_map)
+CHECK_CXX_COMPILER_FLAG(-fdebug-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=. cxx_compiler_debug_prefix_map)
+if(DEBUG_PREFIX_MAP AND c_compiler_debug_prefix_map AND cxx_compiler_debug_prefix_map)
+  set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdebug-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=.")
+  set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdebug-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=.")
+endif()
+
+CHECK_C_COMPILER_FLAG(-fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=. c_compiler_macro_prefix_map)
+CHECK_CXX_COMPILER_FLAG(-fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=. cxx_compiler_macro_prefix_map)
+if (c_compiler_macro_prefix_map)
+  set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=.")
+endif()
+if (cxx_compiler_macro_prefix_map)
+  set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fmacro-prefix-map=${CMAKE_CURRENT_SOURCE_DIR}=.")
+endif()
+
 # warn on sign-conversion
 #include(CheckCCompilerFlag)
 #CHECK_C_COMPILER_FLAG(-Wsign-conversion c_compiler_will_warn_sign_conversion)

core/debian/rules

@@ -29,6 +29,7 @@ STORAGE_DAEMON_GROUP = $(DAEMON_GROUP)
 BAREOS_VERSION := $(shell dpkg-parsechangelog | egrep '^Version:' | sed 's/Version: //g')
 
 define CONFIGURE_COMMON
+  -DDEBUG_PREFIX_MAP:BOOL=OFF \
   -Dsbin-perm=755 \
   -Dsbindir=/usr/sbin \
   -Dbindir=/usr/bin \

core/platforms/packaging/bareos.spec

@@ -737,14 +737,15 @@ CXXFLAGS="${CXXFLAGS:-%optflags}" ; export CXXFLAGS ;
 
 # use our own cmake call instead of cmake macro as it is different on different platforms/versions
 cmake  .. \
-      -DCMAKE_VERBOSE_MAKEFILE=ON \
-      -DCMAKE_INSTALL_PREFIX:PATH=/usr \
-      -DCMAKE_INSTALL_LIBDIR:PATH=/usr/lib \
-      -DINCLUDE_INSTALL_DIR:PATH=/usr/include \
-      -DLIB_INSTALL_DIR:PATH=/usr/lib \
-      -DSYSCONF_INSTALL_DIR:PATH=/etc \
-      -DSHARE_INSTALL_PREFIX:PATH=/usr/share \
-      -DBUILD_SHARED_LIBS:BOOL=ON \
+  -DCMAKE_VERBOSE_MAKEFILE=ON \
+  -DCMAKE_INSTALL_PREFIX:PATH=/usr \
+  -DCMAKE_INSTALL_LIBDIR:PATH=/usr/lib \
+  -DINCLUDE_INSTALL_DIR:PATH=/usr/include \
+  -DLIB_INSTALL_DIR:PATH=/usr/lib \
+  -DSYSCONF_INSTALL_DIR:PATH=/etc \
+  -DSHARE_INSTALL_PREFIX:PATH=/usr/share \
+  -DBUILD_SHARED_LIBS:BOOL=ON \
+  -DDEBUG_PREFIX_MAP:BOOL=OFF \
   -Dprefix=%{_prefix}\
   -Dlibdir=%{library_dir} \
   -Dsbindir=%{_sbindir} \