Trace the commit ID and branch the library was built from

Alc/ALc.c

@@ -20,6 +20,8 @@
 
 #include "config.h"
 
+#include "version.h"
+
 #include <math.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -900,6 +902,8 @@ static void alc_initconfig(void)
         else ERR("Failed to open log file '%s'\n", str);
     }
 
+    TRACE("Initializing library v%s-%s %s\n", ALSOFT_VERSION,
+          ALSOFT_GIT_COMMIT_HASH, ALSOFT_GIT_BRANCH);
     {
         char buf[1024] = "";
         int len = snprintf(buf, sizeof(buf), "%s", BackendList[0].name);

CMakeLists.txt

@@ -1174,6 +1174,25 @@ IF(LIBTYPE STREQUAL "STATIC")
     SET(PKG_CONFIG_CFLAGS -DAL_LIBTYPE_STATIC ${PKG_CONFIG_CFLAGS})
 ENDIF()
 
+IF(EXISTS "${OpenAL_SOURCE_DIR}/.git")
+    # Get the current working branch and its latest abbreviated commit hash
+    EXECUTE_PROCESS(
+        COMMAND git rev-parse --abbrev-ref HEAD
+        WORKING_DIRECTORY "${OpenAL_SOURCE_DIR}"
+        OUTPUT_VARIABLE GIT_BRANCH
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+    EXECUTE_PROCESS(
+        COMMAND git log -1 --format=%h
+        WORKING_DIRECTORY "${OpenAL_SOURCE_DIR}"
+        OUTPUT_VARIABLE GIT_COMMIT_HASH
+        OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+ELSE()
+    SET(GIT_BRANCH "UNKNOWN")
+    SET(GIT_COMMIT_HASH "unknown")
+ENDIF()
+
 # Needed for openal.pc.in
 SET(prefix ${CMAKE_INSTALL_PREFIX})
 SET(exec_prefix "\${prefix}")
@@ -1183,6 +1202,9 @@ SET(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
 SET(PACKAGE_VERSION "${LIB_VERSION}")
 
 # End configuration
+CONFIGURE_FILE(
+    "${OpenAL_SOURCE_DIR}/version.h.in"
+    "${OpenAL_BINARY_DIR}/version.h")
 CONFIGURE_FILE(
     "${OpenAL_SOURCE_DIR}/config.h.in"
     "${OpenAL_BINARY_DIR}/config.h")

OpenAL32/alState.c

@@ -20,6 +20,8 @@
 
 #include "config.h"
 
+#include "version.h"
+
 #include <stdlib.h>
 #include "alMain.h"
 #include "AL/alc.h"

config.h.in

@@ -2,9 +2,6 @@
 #define AL_API  ${EXPORT_DECL}
 #define ALC_API ${EXPORT_DECL}
 
-/* Define to the library version */
-#define ALSOFT_VERSION "${LIB_VERSION}"
-
 /* Define any available alignment declaration */
 #define ALIGN(x) ${ALIGN_DECL}
 

utils/alsoft-config/mainwindow.cpp

@@ -1,6 +1,8 @@
 
 #include "config.h"
 
+#include "version.h"
+
 #include <iostream>
 #include <cmath>
 
@@ -461,7 +463,8 @@ void MainWindow::cancelCloseAction()
 void MainWindow::showAboutPage()
 {
     QMessageBox::information(this, tr("About"),
-        tr("OpenAL Soft Configuration Utility.\nBuilt for OpenAL Soft library version ")+(ALSOFT_VERSION ".")
+        tr("OpenAL Soft Configuration Utility.\nBuilt for OpenAL Soft library version ")+
+        (ALSOFT_VERSION "-" ALSOFT_GIT_COMMIT_HASH " (" ALSOFT_GIT_BRANCH " branch).")
     );
 }
 

version.h.in

@@ -0,0 +1,8 @@
+/* Define to the library version */
+#define ALSOFT_VERSION "${LIB_VERSION}"
+
+/* Define the branch being built */
+#define ALSOFT_GIT_BRANCH "${GIT_BRANCH}"
+
+/* Define the hash of the head commit */
+#define ALSOFT_GIT_COMMIT_HASH "${GIT_COMMIT_HASH}"