From: Urs Fleisch <ufleisch@users.sourceforge.net>
Date: Sun, 10 May 2015 08:30:51 +0000 (+0200)
Subject: Get version information from taglib.h.
X-Git-Tag: v1.11beta~107^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=b5c0ab58ba48c57d283abcc41f936e4ab27be5d0;p=taglib

Get version information from taglib.h.

This avoids duplication of the version information in both
CMakeLists.txt and taglib.h while keeping the possibility to
use something different from CMake.
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d4469b5d..bae9e2fc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,9 +52,20 @@ if (MSVC AND ENABLE_STATIC_RUNTIME)
   endforeach(flag_var)
 endif()
 
-set(TAGLIB_LIB_MAJOR_VERSION "1")
-set(TAGLIB_LIB_MINOR_VERSION "9")
-set(TAGLIB_LIB_PATCH_VERSION "1")
+# Read version information from file taglib/toolkit/taglib.h into variables
+# TAGLIB_LIB_MAJOR_VERSION, TAGLIB_LIB_MINOR_VERSION, TAGLIB_LIB_PATCH_VERSION.
+foreach(version_part MAJOR MINOR PATCH)
+  set(version_var_name "TAGLIB_${version_part}_VERSION")
+  file(STRINGS taglib/toolkit/taglib.h version_line
+       REGEX "^#define +${version_var_name}")
+  if(NOT version_line)
+    message(FATAL_ERROR "${version_var_name} not found in taglib.h")
+  endif()
+  string(REGEX MATCH "${version_var_name} +([^ ]+)" result ${version_line})
+  set(TAGLIB_LIB_${version_part}_VERSION ${CMAKE_MATCH_1})
+endforeach(version_part)
+# Only used to force cmake rerun when taglib.h changes.
+configure_file(taglib/toolkit/taglib.h ${CMAKE_CURRENT_BINARY_DIR}/taglib.h.stamp)
 
 set(TAGLIB_LIB_VERSION_STRING "${TAGLIB_LIB_MAJOR_VERSION}.${TAGLIB_LIB_MINOR_VERSION}.${TAGLIB_LIB_PATCH_VERSION}")