Merge topic 'FindIntl-FindIconv-versions'

a9b11a06f5 FindIntl: Add version support
01e9922db5 FindIconv: Add version support

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5852

2 files changed, 139 insertions, 22 deletions

diff --git a/Modules/FindIconv.cmake b/Modules/FindIconv.cmake
index 41b7550..5ec12b2 100644
--- a/Modules/FindIconv.cmake
+++ b/Modules/FindIconv.cmake
@@ -25,6 +25,24 @@ The following variables are provided to indicate iconv support:
 
   The iconv libraries to be linked.
 
+.. variable:: Iconv_VERSION
+
+  .. versionadded:: 3.21
+
+  The version of iconv found (x.y)
+
+.. variable:: Iconv_VERSION_MAJOR
+
+  .. versionadded:: 3.21
+
+  The major version of iconv
+
+.. variable:: Iconv_VERSION_MINOR
+
+  .. versionadded:: 3.21
+
+  The minor version of iconv
+
 .. variable:: Iconv_IS_BUILT_IN
 
   A variable indicating whether iconv support is stemming from the
@@ -51,6 +69,10 @@ The following cache variables may also be set:
   On POSIX platforms, iconv might be part of the C library and the cache
   variables ``Iconv_INCLUDE_DIR`` and ``Iconv_LIBRARY`` might be empty.
 
+.. note::
+  Some libiconv implementations don't embed the version number in their header files.
+  In this case the variables ``Iconv_VERSION*`` will be empty.
+
 #]=======================================================================]
 
 include(${CMAKE_CURRENT_LIST_DIR}/CMakePushCheckState.cmake)
@@ -118,9 +140,29 @@ find_library(Iconv_LIBRARY
 mark_as_advanced(Iconv_INCLUDE_DIR)
 mark_as_advanced(Iconv_LIBRARY)
 
+# NOTE: glibc's iconv.h does not define _LIBICONV_VERSION
+if(Iconv_INCLUDE_DIR AND NOT Iconv_IS_BUILT_IN)
+  file(STRINGS ${Iconv_INCLUDE_DIR}/iconv.h Iconv_VERSION_DEFINE REGEX "_LIBICONV_VERSION (.*)")
+
+  if(Iconv_VERSION_DEFINE MATCHES "(0x[A-Fa-f0-9]+)")
+    set(Iconv_VERSION_NUMBER "${CMAKE_MATCH_1}")
+    # encoding -> version number: (major<<8) + minor
+    math(EXPR Iconv_VERSION_MAJOR "${Iconv_VERSION_NUMBER} >> 8" OUTPUT_FORMAT HEXADECIMAL)
+    math(EXPR Iconv_VERSION_MINOR "${Iconv_VERSION_NUMBER} - (${Iconv_VERSION_MAJOR} << 8)" OUTPUT_FORMAT HEXADECIMAL)
+
+    math(EXPR Iconv_VERSION_MAJOR "${Iconv_VERSION_MAJOR}" OUTPUT_FORMAT DECIMAL)
+    math(EXPR Iconv_VERSION_MINOR "${Iconv_VERSION_MINOR}" OUTPUT_FORMAT DECIMAL)
+    set(Iconv_VERSION "${Iconv_VERSION_MAJOR}.${Iconv_VERSION_MINOR}")
+  endif()
+
+  unset(Iconv_VERSION_DEFINE)
+  unset(Iconv_VERSION_NUMBER)
+endif()
+
 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
 if(NOT Iconv_IS_BUILT_IN)
-  find_package_handle_standard_args(Iconv REQUIRED_VARS Iconv_LIBRARY Iconv_INCLUDE_DIR)
+  find_package_handle_standard_args(Iconv REQUIRED_VARS Iconv_LIBRARY Iconv_INCLUDE_DIR
+                                    VERSION_VAR Iconv_VERSION)
 else()
   find_package_handle_standard_args(Iconv REQUIRED_VARS Iconv_LIBRARY)
 endif()
diff --git a/Modules/FindIntl.cmake b/Modules/FindIntl.cmake
index 686c818..a1dfed1 100644
--- a/Modules/FindIntl.cmake
+++ b/Modules/FindIntl.cmake
@@ -10,27 +10,75 @@ FindIntl
 Find the Gettext libintl headers and libraries.
 
 This module reports information about the Gettext libintl
-installation in several variables.  General variables::
+installation in several variables.
 
-  Intl_FOUND - true if the libintl headers and libraries were found
-  Intl_INCLUDE_DIRS - the directory containing the libintl headers
-  Intl_LIBRARIES - libintl libraries to be linked
+.. variable:: Intl_FOUND
+
+  True if libintl is found.
+
+.. variable:: Intl_INCLUDE_DIRS
+
+  The directory containing the libintl headers.
+
+.. variable:: Intl_LIBRARIES
+
+  The intl libraries to be linked.
+
+.. variable:: Intl_VERSION
+
+  .. versionadded:: 3.21
+
+  The version of intl found (x.y.z)
+
+.. variable:: Intl_VERSION_MAJOR
+
+  .. versionadded:: 3.21
+
+  The major version of intl
+
+.. variable:: Intl_VERSION_MINOR
+
+  .. versionadded:: 3.21
+
+  The minor version of intl
+
+.. variable:: Intl_VERSION_PATCH
+
+  .. versionadded:: 3.21
+
+  The patch version of intl
 
 .. versionadded:: 3.20
   This module defines :prop_tgt:`IMPORTED` target ``Intl::Intl``.
 
-The following cache variables may also be set::
+The following cache variables may also be set:
 
-  Intl_INCLUDE_DIR - the directory containing the libintl headers
-  Intl_LIBRARY - the libintl library (if any)
-  Intl_HAVE_GETTEXT_BUILTIN - check if gettext is in the C library
-  Intl_HAVE_DCGETTEXT_BUILTIN - check if dcgettext is in the C library
-  Intl_IS_BUILTIN - whether intl is a part of the C library determined
-      from the result of Intl_HAVE_GETTEXT_BUILTIN and Intl_HAVE_DCGETTEXT_BUILTIN
+.. variable:: Intl_INCLUDE_DIR
 
-.. versionadded:: 3.20
-  Added the ``Intl_HAVE_GETTEXT_BUILTIN``, ``Intl_HAVE_DCGETTEXT_BUILTIN`` and
-  ``Intl_IS_BUILTIN`` variables.
+  The directory containing the libintl headers
+
+.. variable:: Intl_LIBRARY
+
+  The libintl library (if any)
+
+.. variable:: Intl_HAVE_GETTEXT_BUILTIN
+
+  .. versionadded:: 3.20
+
+  True if gettext is in the C library
+
+.. variable:: Intl_HAVE_DCGETTEXT_BUILTIN
+
+  .. versionadded:: 3.20
+
+  True if dcgettext is in the C library
+
+.. variable:: Intl_IS_BUILTIN
+
+  .. versionadded:: 3.20
+
+  whether intl is a part of the C library determined from the result of
+  Intl_HAVE_GETTEXT_BUILTIN and Intl_HAVE_DCGETTEXT_BUILTIN
 
 .. note::
   On some platforms, such as Linux with GNU libc, the gettext
@@ -39,6 +87,10 @@ The following cache variables may also be set::
   case.
 
 .. note::
+  Some libintl implementations don't embed the version number in their header files.
+  In this case the variables ``Intl_VERSION*`` will be empty.
+
+.. note::
   If you wish to use the Gettext tools (``msgmerge``,
   ``msgfmt``, etc.), use :module:`FindGettext`.
 #]=======================================================================]
@@ -69,20 +121,43 @@ find_path(Intl_INCLUDE_DIR
 mark_as_advanced(Intl_INCLUDE_DIR)
 
 # Find all Intl libraries
-set(Intl_REQUIRED_VARS)
 if(NOT Intl_IS_BUILTIN)
-  find_library(Intl_LIBRARY "intl" "libintl" NAMES_PER_DIR
-    DOC "libintl libraries (if not in the C library)")
-  mark_as_advanced(Intl_LIBRARY)
-  list(APPEND Intl_REQUIRED_VARS Intl_LIBRARY)
+  set(Intl_LIBRARY_NAMES "intl" "libintl")
+else()
+  set(Intl_LIBRARY_NAMES "c")
+endif()
+
+find_library(Intl_LIBRARY ${Intl_LIBRARY_NAMES} NAMES_PER_DIR
+              DOC "intl library (potentially the C library)")
+mark_as_advanced(Intl_LIBRARY)
+
+# NOTE: glibc's libintl.h does not define LIBINTL_VERSION
+if(Intl_INCLUDE_DIR AND NOT Intl_IS_BUILTIN)
+  file(STRINGS ${Intl_INCLUDE_DIR}/libintl.h Intl_VERSION_DEFINE REGEX "LIBINTL_VERSION (.*)")
+
+  if(Intl_VERSION_DEFINE MATCHES "(0x[A-Fa-f0-9]+)")
+    set(Intl_VERSION_NUMBER "${CMAKE_MATCH_1}")
+    # encoding -> version number: (major<<16) + (minor<<8) + patch
+    math(EXPR Intl_VERSION_MAJOR "${Intl_VERSION_NUMBER} >> 16" OUTPUT_FORMAT HEXADECIMAL)
+    math(EXPR Intl_VERSION_MINOR "(${Intl_VERSION_NUMBER} - (${Intl_VERSION_MAJOR} << 16)) >> 8" OUTPUT_FORMAT HEXADECIMAL)
+    math(EXPR Intl_VERSION_PATCH "${Intl_VERSION_NUMBER} - ((${Intl_VERSION_MAJOR} << 16) + (${Intl_VERSION_MINOR} << 8))" OUTPUT_FORMAT HEXADECIMAL)
+
+    math(EXPR Intl_VERSION_MAJOR "${Intl_VERSION_MAJOR}" OUTPUT_FORMAT DECIMAL)
+    math(EXPR Intl_VERSION_MINOR "${Intl_VERSION_MINOR}" OUTPUT_FORMAT DECIMAL)
+    math(EXPR Intl_VERSION_PATCH "${Intl_VERSION_PATCH}" OUTPUT_FORMAT DECIMAL)
+    set(Intl_VERSION "${Intl_VERSION_MAJOR}.${Intl_VERSION_MINOR}.${Intl_VERSION_PATCH}")
+  endif()
+
+  unset(Intl_VERSION_DEFINE)
+  unset(Intl_VERSION_NUMBER)
 endif()
 
 include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(Intl
                                   FOUND_VAR Intl_FOUND
-                                  REQUIRED_VARS Intl_INCLUDE_DIR ${Intl_REQUIRED_VARS}
+                                  REQUIRED_VARS Intl_LIBRARY Intl_INCLUDE_DIR
+                                  VERSION_VAR Intl_VERSION
                                   FAIL_MESSAGE "Failed to find Gettext libintl")
-unset(Intl_REQUIRED_VARS)
 
 if(Intl_FOUND)
   set(Intl_INCLUDE_DIRS "${Intl_INCLUDE_DIR}")