cmake: set the soname on the shared library

Set SONAME and VERSION for platforms we think this works on. Remove
issue from KNOWN_BUGS.

Assisted-by: Jakub Zakrzewski

Closes #10023

3 files changed, 71 insertions, 14 deletions

diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 8cea346c3..5ca5357d9 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -98,11 +98,37 @@ endif()
 
 target_link_libraries(${LIB_NAME} PRIVATE ${CURL_LIBS})
 
+transform_makefile_inc("Makefile.soname" "${CMAKE_CURRENT_BINARY_DIR}/Makefile.soname.cmake")
+include(${CMAKE_CURRENT_BINARY_DIR}/Makefile.soname.cmake)
+
 set_target_properties(${LIB_NAME} PROPERTIES
   COMPILE_DEFINITIONS BUILDING_LIBCURL
   OUTPUT_NAME ${LIBCURL_OUTPUT_NAME}
   )
 
+if(CMAKE_SYSTEM_NAME STREQUAL "AIX" OR
+  CMAKE_SYSTEM_NAME STREQUAL "Linux" OR
+  CMAKE_SYSTEM_NAME STREQUAL "GNU/kFreeBSD" OR
+
+  # FreeBSD comes with the a.out and elf flavours
+  # but a.out was supported up to version 3.x and
+  # elf from 3.x. I cannot imagine someone runnig
+  # CMake on those ancient systems
+  CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" OR
+
+  CMAKE_SYSTEM_NAME STREQUAL "Haiku")
+
+  math(EXPR CMAKESONAME "${VERSIONCHANGE} - ${VERSIONDEL}")
+  set(CMAKEVERSION "${CMAKESONAME}.${VERSIONDEL}.${VERSIONADD}")
+
+  set_target_properties(${LIB_NAME} PROPERTIES
+    VERSION ${CMAKEVERSION}
+    SOVERSION ${CMAKESONAME}
+  )
+
+endif()
+
+
 if(HIDES_CURL_PRIVATE_SYMBOLS)
   set_property(TARGET ${LIB_NAME} APPEND PROPERTY COMPILE_DEFINITIONS "CURL_HIDDEN_SYMBOLS")
   set_property(TARGET ${LIB_NAME} APPEND PROPERTY COMPILE_FLAGS ${CURL_CFLAG_SYMBOLS_HIDE})
diff --git a/lib/Makefile.am b/lib/Makefile.am
index e74ce1f0d..033b4bf10 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -28,7 +28,8 @@ CMAKE_DIST = CMakeLists.txt curl_config.h.cmake
 EXTRA_DIST = Makefile.mk config-win32.h config-win32ce.h config-plan9.h    \
  config-riscos.h config-mac.h curl_config.h.in config-dos.h                \
  libcurl.plist libcurl.rc config-amigaos.h config-win32ce.h                \
- config-os400.h setup-os400.h $(CMAKE_DIST) setup-win32.h .checksrc
+ config-os400.h setup-os400.h $(CMAKE_DIST) setup-win32.h .checksrc \
+ Makefile.soname
 
 lib_LTLIBRARIES = libcurl.la
 
@@ -57,19 +58,7 @@ AM_CPPFLAGS = -I$(top_srcdir)/include        \
 # Prevent LIBS from being used for all link targets
 LIBS = $(BLANK_AT_MAKETIME)
 
-VERSIONINFO=-version-info 12:0:8
-# This flag accepts an argument of the form current[:revision[:age]]. So,
-# passing -version-info 3:12:1 sets current to 3, revision to 12, and age to
-# 1.
-#
-# Here's the simplified rule guide on how to change -version-info:
-# (current version is C:R:A)
-#
-# 1. if there are only source changes, use C:R+1:A
-# 2. if interfaces were added use C+1:0:A+1
-# 3. if interfaces were removed, then use C+1:0:0
-#
-# For the full guide on libcurl ABI rules, see docs/libcurl/ABI
+include Makefile.soname
 
 AM_CPPFLAGS += -DBUILDING_LIBCURL
 AM_LDFLAGS =
diff --git a/lib/Makefile.soname b/lib/Makefile.soname
new file mode 100644
index 000000000..2c6cfdea6
--- /dev/null
+++ b/lib/Makefile.soname
@@ -0,0 +1,42 @@
+#***************************************************************************
+#                                  _   _ ____  _
+#  Project                     ___| | | |  _ \| |
+#                             / __| | | | |_) | |
+#                            | (__| |_| |  _ <| |___
+#                             \___|\___/|_| \_\_____|
+#
+# Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at https://curl.se/docs/copyright.html.
+#
+# You may opt to use, copy, modify, merge, publish, distribute and/or sell
+# copies of the Software, and permit persons to whom the Software is
+# furnished to do so, under the terms of the COPYING file.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+# SPDX-License-Identifier: curl
+#
+###########################################################################
+
+VERSIONCHANGE=12
+VERSIONADD=0
+VERSIONDEL=8
+
+# libtool version:
+VERSIONINFO=-version-info $(VERSIONCHANGE):$(VERSIONADD):$(VERSIONDEL)
+# This flag accepts an argument of the form current[:revision[:age]]. So,
+# passing -version-info 3:12:1 sets current to 3, revision to 12, and age to
+# 1.
+#
+# Here's the simplified rule guide on how to change -version-info:
+# (current version is C:R:A)
+#
+# 1. if there are only source changes, use C:R+1:A
+# 2. if interfaces were added use C+1:0:A+1
+# 3. if interfaces were removed, then use C+1:0:0
+#
+# For the full guide on libcurl ABI rules, see docs/libcurl/ABI