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cmake: Introduce symbol versioning

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This adds a cmake module, FindABIMap, which looks for abimap and
provides functions to generate a symbol version linker script.

The module can be included using find_package(ABIMap).

This also adds the option to compile with symbol versioning.  The symbol
list is obtained from the header files by filtering those marked with
the LIBSSH_API modifier.

Such symbols are used as input to generate the version script used by
the linker.  The version script is automatically updated as new symbols
marked with LIBSSH_API are added to the header files.

If any symbol is removed, the build will fail due to break in the ABI.

Symbol versioning is enabled by default if abimap has been found. It is
disabled in non-UNIX platforms. It can be disabled by passing
"-DWITH_SYMBOL_VERSIONING=OFF" option to cmake.

Pair-Programmed-With: Andreas Schneider <asn@cryptomilk.org>

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Anderson Toshiyuki Sasaki
2018-05-14 15:55:06 +02:00
committed by Andreas Schneider
parent 0f64bc78a8
commit efc427fdce
9 changed files with 779 additions and 4 deletions
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6
DefineOptions.cmake
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@ -16,6 +16,8 @@ option(SERVER_TESTING "Build with server tests; requires openssh and dropbear" O
option(WITH_BENCHMARKS "Build benchmarks tools" OFF)
option(WITH_EXAMPLES "Build examples" ON)
option(WITH_NACL "Build with libnacl (curve25519)" ON)
option(WITH_SYMBOL_VERSIONING "Build with symbol versioning" ON)
option(WITH_ABI_BREAK "Allow ABI break" OFF)
option(FUZZ_TESTING "Build with fuzzer for the server" OFF)
if (WITH_ZLIB)
set(WITH_LIBZ ON)
@ -34,3 +36,7 @@ endif (UNIT_TESTING)
if (WITH_NACL)
set(WITH_NACL ON)
endif (WITH_NACL)
if (WITH_ABI_BREAK)
set(WITH_SYMBOL_VERSIONING ON)
endif (WITH_ABI_BREAK)