Add ECMGenerateExportHeader, for improved handling of deprecated API

Summary:
Generates additional macros in the export header which can be used for
fine-grained disabling of warnings & visibility as well as excluding from
the build.

Reviewers: #frameworks, #build_system

Subscribers: chehrlic, dfaure, cgiboudeaux, kde-frameworks-devel, kde-buildsystem

Tags: #frameworks, #build_system

Differential Revision: https://phabricator.kde.org/D23789

2 files changed, 54 insertions, 0 deletions

diff --git a/tests/ECMGenerateExportHeaderTest/format_version/CMakeLists.txt b/tests/ECMGenerateExportHeaderTest/format_version/CMakeLists.txt
new file mode 100644
index 00000000..b46719c2
--- /dev/null
+++ b/tests/ECMGenerateExportHeaderTest/format_version/CMakeLists.txt
@@ -0,0 +1,50 @@
+cmake_minimum_required(VERSION 3.0.0)
+
+project(format_version)
+
+set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../../modules)
+include(ECMGenerateExportHeader)
+
+include(../../test_helpers.cmake)
+
+set(_current_version "4.5.6")
+
+# check 0
+ecm_export_header_format_version(0
+    CURRENT_VERSION ${_current_version}
+    STRING_VAR _versionstring
+    HEXNUMBER_VAR _hexnumber
+)
+
+assert_var_str_value(_versionstring "0")
+assert_var_str_value(_hexnumber "0")
+
+# check other
+ecm_export_header_format_version(1.2.3
+    CURRENT_VERSION ${_current_version}
+    STRING_VAR _versionstring
+    HEXNUMBER_VAR _hexnumber
+)
+
+assert_var_str_value(_versionstring "1.2.3")
+if (NOT CMAKE_VERSION VERSION_LESS 3.13)
+    assert_var_str_value(_hexnumber "0x10203")
+else()
+    assert_var_str_value(_hexnumber "66051")
+endif()
+
+# check CURRENT
+ecm_export_header_format_version(CURRENT
+    CURRENT_VERSION ${_current_version}
+    STRING_VAR _versionstring
+    HEXNUMBER_VAR _hexnumber
+)
+
+assert_var_str_value(_versionstring "4.5.6")
+if (NOT CMAKE_VERSION VERSION_LESS 3.13)
+    assert_var_str_value(_hexnumber "0x40506")
+else()
+    assert_var_str_value(_hexnumber "263430")
+endif()
+
+add_executable(dummy main.cpp)
diff --git a/tests/ECMGenerateExportHeaderTest/format_version/main.cpp b/tests/ECMGenerateExportHeaderTest/format_version/main.cpp
new file mode 100644
index 00000000..0f45ea60
--- /dev/null
+++ b/tests/ECMGenerateExportHeaderTest/format_version/main.cpp
@@ -0,0 +1,4 @@
+int main(int, char**)
+{
+    return 0;
+}