build: remove glibc backcompat

CMakeLists.txt

@@ -881,12 +881,6 @@ else()
     set(LD_SECURITY_FLAGS "${LD_SECURITY_FLAGS} -Wl,-z,noexecheap")
   endif()
 
-  if(BACKCOMPAT)
-      add_linker_flag_if_supported(-Wl,--wrap=__divmoddi4 LD_BACKCOMPAT_FLAGS)
-      add_linker_flag_if_supported(-Wl,--wrap=glob LD_BACKCOMPAT_FLAGS)
-      message(STATUS "Using Lib C back compat flags: ${LD_BACKCOMPAT_FLAGS}")
-  endif()
-
   # some windows linker bits
   if (WIN32)
     add_linker_flag_if_supported(-Wl,--dynamicbase LD_SECURITY_FLAGS)
@@ -907,7 +901,7 @@ else()
 
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_GNU_SOURCE ${MINGW_FLAG} ${STATIC_ASSERT_FLAG} ${WARNINGS} ${C_WARNINGS} ${PIC_FLAG} ${C_SECURITY_FLAGS}")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_GNU_SOURCE ${MINGW_FLAG} ${STATIC_ASSERT_CPP_FLAG} ${WARNINGS} ${CXX_WARNINGS} ${PIC_FLAG} ${CXX_SECURITY_FLAGS}")
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${LD_SECURITY_FLAGS} ${LD_BACKCOMPAT_FLAGS}")
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${LD_SECURITY_FLAGS}")
 
   # With GCC 6.1.1 the compiled binary malfunctions due to aliasing. Until that
   # is fixed in the code (Issue #847), force compiler to be conservative.

README.md

@@ -508,7 +508,7 @@ The required packages are the names for each toolchain on apt. Depending on your
 
 Using `depends` might also be easier to compile Monero on Windows than using MSYS. Activate Windows Subsystem for Linux (WSL) with a distro (for example Ubuntu), install the apt build-essentials and follow the `depends` steps as depicted above.
 
-The produced binaries still link libc dynamically. If the binary is compiled on a current distribution, it might not run on an older distribution with an older installation of libc. Passing `-DBACKCOMPAT=ON` to cmake will make sure that the binary will run on systems having at least libc version 2.17.
+The produced binaries still link libc dynamically. If the binary is compiled on a current distribution, it might not run on an older distribution with an older installation of libc.
 
 ### Trezor hardware wallet support
 

contrib/depends/packages/sodium.mk

@@ -3,15 +3,14 @@ $(package)_version=1.0.18
 $(package)_download_path=https://download.libsodium.org/libsodium/releases/
 $(package)_file_name=libsodium-$($(package)_version).tar.gz
 $(package)_sha256_hash=6f504490b342a4f8a4c4a02fc9b866cbef8622d5df4e5452b46be121e46636c1
-$(package)_patches=disable-glibc-getrandom-getentropy.patch fix-whitespace.patch
+$(package)_patches=fix-whitespace.patch
 
 define $(package)_set_vars
 $(package)_config_opts=--enable-static --disable-shared
 $(package)_config_opts+=--prefix=$(host_prefix)
 endef
 
 define $(package)_preprocess_cmds
-  patch -p1 < $($(package)_patch_dir)/disable-glibc-getrandom-getentropy.patch &&\
   autoconf &&\
   patch -p1 < $($(package)_patch_dir)/fix-whitespace.patch
 endef

contrib/depends/packages/unbound.mk

@@ -4,7 +4,6 @@ $(package)_download_path=https://www.nlnetlabs.nl/downloads/$(package)/
 $(package)_file_name=$(package)-$($(package)_version).tar.gz
 $(package)_sha256_hash=bc1d576f3dd846a0739adc41ffaa702404c6767d2b6082deb9f2f97cbb24a3a9
 $(package)_dependencies=openssl expat
-$(package)_patches=disable-glibc-reallocarray.patch
 
 
 define $(package)_set_vars
@@ -19,7 +18,6 @@ define $(package)_set_vars
 endef
 
 define $(package)_preprocess_cmds
-  patch -p1 < $($(package)_patch_dir)/disable-glibc-reallocarray.patch &&\
   autoconf
 endef
 

src/common/CMakeLists.txt

@@ -52,10 +52,6 @@ if (STACK_TRACE)
   list(APPEND common_sources stack_trace.cpp)
 endif()
 
-if (BACKCOMPAT)
-  list(APPEND common_sources compat/glibc_compat.cpp)
-endif()
-
 set(common_headers)
 
 monero_find_all_headers(common_private_headers "${CMAKE_CURRENT_SOURCE_DIR}")