From e6616cf0db2b63189fc34d0076f654af9adecdf8 Mon Sep 17 00:00:00 2001
From: Cebtenzzre <cebtenzzre@gmail.com>
Date: Fri, 15 Sep 2023 16:59:49 -0400
Subject: examples : add compiler version and target to build info (#2998)

---
 scripts/build-info.cmake | 42 +++++++++++++++++++++++++++++++++++++++---
 scripts/build-info.h.in  |  2 ++
 scripts/build-info.sh    | 38 +++++++++++++++++++++++++-------------
 3 files changed, 66 insertions(+), 16 deletions(-)

(limited to 'scripts')

diff --git a/scripts/build-info.cmake b/scripts/build-info.cmake
index 5023b77a..e33f3349 100644
--- a/scripts/build-info.cmake
+++ b/scripts/build-info.cmake
@@ -2,6 +2,8 @@ set(TEMPLATE_FILE "${CMAKE_CURRENT_SOURCE_DIR}/scripts/build-info.h.in")
 set(HEADER_FILE "${CMAKE_CURRENT_SOURCE_DIR}/build-info.h")
 set(BUILD_NUMBER 0)
 set(BUILD_COMMIT "unknown")
+set(BUILD_COMPILER "unknown")
+set(BUILD_TARGET "unknown")
 
 # Look for git
 find_package(Git)
@@ -41,11 +43,45 @@ if(Git_FOUND)
     endif()
 endif()
 
+if(GIT_HEAD_RESULT EQUAL 0 AND GIT_COUNT_RESULT EQUAL 0)
+    set(BUILD_COMMIT ${HEAD})
+    set(BUILD_NUMBER ${COUNT})
+endif()
+
+execute_process(
+    COMMAND sh -c "$@ --version | head -1" _ ${CMAKE_C_COMPILER}
+    OUTPUT_VARIABLE OUT
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    RESULT_VARIABLE RES
+)
+if (RES EQUAL 0)
+    set(BUILD_COMPILER ${OUT})
+endif()
+
+execute_process(
+    COMMAND ${CMAKE_C_COMPILER} -dumpmachine
+    OUTPUT_VARIABLE OUT
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+    RESULT_VARIABLE RES
+)
+if (RES EQUAL 0)
+    set(BUILD_TARGET ${OUT})
+endif()
+
 # Only write the header if it's changed to prevent unnecessary recompilation
 if(EXISTS ${HEADER_FILE})
-    file(STRINGS ${HEADER_FILE} CONTENTS REGEX "BUILD_COMMIT \"([^\"]*)\"")
-    list(GET CONTENTS 0 EXISTING)
-    if(NOT EXISTING STREQUAL "#define BUILD_COMMIT \"${BUILD_COMMIT}\"")
+    file(READ ${HEADER_FILE} CONTENTS)
+    string(REGEX MATCH "BUILD_COMMIT \"([^\"]*)\"" _ ${CONTENTS})
+    set(OLD_COMMIT ${CMAKE_MATCH_1})
+    string(REGEX MATCH "BUILD_COMPILER \"([^\"]*)\"" _ ${CONTENTS})
+    set(OLD_COMPILER ${CMAKE_MATCH_1})
+    string(REGEX MATCH "BUILD_TARGET \"([^\"]*)\"" _ ${CONTENTS})
+    set(OLD_TARGET ${CMAKE_MATCH_1})
+    if (
+        NOT OLD_COMMIT   STREQUAL BUILD_COMMIT   OR
+        NOT OLD_COMPILER STREQUAL BUILD_COMPILER OR
+        NOT OLD_TARGET   STREQUAL BUILD_TARGET
+    )
         configure_file(${TEMPLATE_FILE} ${HEADER_FILE})
     endif()
 else()
diff --git a/scripts/build-info.h.in b/scripts/build-info.h.in
index 75d1e16f..e996faef 100644
--- a/scripts/build-info.h.in
+++ b/scripts/build-info.h.in
@@ -3,5 +3,7 @@
 
 #define BUILD_NUMBER @BUILD_NUMBER@
 #define BUILD_COMMIT "@BUILD_COMMIT@"
+#define BUILD_COMPILER "@BUILD_COMPILER@"
+#define BUILD_TARGET "@BUILD_TARGET@"
 
 #endif // BUILD_INFO_H
diff --git a/scripts/build-info.sh b/scripts/build-info.sh
index ed0d6c56..3c8b1fb8 100755
--- a/scripts/build-info.sh
+++ b/scripts/build-info.sh
@@ -1,23 +1,35 @@
 #!/bin/sh
 
-BUILD_NUMBER="0"
-BUILD_COMMIT="unknown"
+CC=$1
 
-REV_LIST=$(git rev-list --count HEAD)
-if [ $? -eq 0 ]; then
-  BUILD_NUMBER=$REV_LIST
+build_number="0"
+build_commit="unknown"
+build_compiler="unknown"
+build_target="unknown"
+
+if out=$(git rev-list --count HEAD); then
+  # git is broken on WSL so we need to strip extra newlines
+  build_number=$(printf '%s' "$out" | tr -d '\n')
+fi
+
+if out=$(git rev-parse --short HEAD); then
+  build_commit=$(printf '%s' "$out" | tr -d '\n')
+fi
+
+if out=$($CC --version | head -1); then
+  build_compiler=$out
 fi
 
-REV_PARSE=$(git rev-parse --short HEAD)
-if [ $? -eq 0 ]; then
-  BUILD_COMMIT=$REV_PARSE
+if out=$($CC -dumpmachine); then
+  build_target=$out
 fi
 
 echo "#ifndef BUILD_INFO_H"
 echo "#define BUILD_INFO_H"
-echo ""
-echo "#define BUILD_NUMBER $BUILD_NUMBER" | tr -d '\n'
-echo ""
-echo "#define BUILD_COMMIT \"$BUILD_COMMIT\"" | tr -d '\n'
-echo ""
+echo
+echo "#define BUILD_NUMBER $build_number"
+echo "#define BUILD_COMMIT \"$build_commit\""
+echo "#define BUILD_COMPILER \"$build_compiler\""
+echo "#define BUILD_TARGET \"$build_target\""
+echo
 echo "#endif // BUILD_INFO_H"
-- 
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