From c92826f54d6a700fa4600a0fe8cdef2163372f92 Mon Sep 17 00:00:00 2001
From: Cory Cross <github@corycross.org>
Date: Mon, 3 Nov 2025 10:48:30 -0800
Subject: [PATCH] Allow building tests separately from Orca with build_linux.sh

---
 build_linux.sh                         | 20 ++++++++------------
 doc/developer-reference/How-to-test.md | 26 +++++++++++++++++++++++---
 2 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/build_linux.sh b/build_linux.sh
index 1f35b464f6..9a9a9160ba 100755
--- a/build_linux.sh
+++ b/build_linux.sh
@@ -27,7 +27,6 @@ function usage() {
     echo "   -L: use ld.lld as linker (if available)"
     echo "For a first use, you want to './${SCRIPT_NAME} -u'"
     echo "   and then './${SCRIPT_NAME} -dsi'"
-    echo "To build with tests: './${SCRIPT_NAME} -st' or './${SCRIPT_NAME} -dst'"
 }
 
 SLIC3R_PRECOMPILED_HEADERS="ON"
@@ -102,11 +101,6 @@ if [ ${OPTIND} -eq 1 ] ; then
     exit 1
 fi
 
-if [[ -n "${BUILD_TESTS}" ]] && [[ -z "${BUILD_ORCA}" ]] ; then
-    echo "-t flag requires -s flag in the same invocation"
-    exit 1
-fi
-
 function check_available_memory_and_disk() {
     FREE_MEM_GB=$(free --gibi --total | grep 'Mem' | rev | cut --delimiter=" " --fields=1 | rev)
     MIN_MEM_GB=10
@@ -221,7 +215,7 @@ if [[ -n "${BUILD_DEPS}" ]] ; then
     print_and_run cmake --build deps/$BUILD_DIR
 fi
 
-if [[ -n "${BUILD_ORCA}" ]] ; then
+if [[ -n "${BUILD_ORCA}" ]] || [[ -n "${BUILD_TESTS}" ]] ; then
     echo "Configuring OrcaSlicer..."
     if [[ -n "${CLEAN_BUILD}" ]] ; then
         print_and_run rm -fr $BUILD_DIR
@@ -243,11 +237,13 @@ if [[ -n "${BUILD_ORCA}" ]] ; then
 "${COLORED_OUTPUT}" \
 "${BUILD_ARGS[@]}"
     echo "done"
-    echo "Building OrcaSlicer ..."
-    print_and_run cmake --build $BUILD_DIR --config "${BUILD_CONFIG}" --target OrcaSlicer
-    echo "Building OrcaSlicer_profile_validator .."
-    print_and_run cmake --build $BUILD_DIR --config "${BUILD_CONFIG}" --target OrcaSlicer_profile_validator
-    ./scripts/run_gettext.sh
+    if [[ -n "${BUILD_ORCA}" ]]; then
+	echo "Building OrcaSlicer ..."
+	print_and_run cmake --build $BUILD_DIR --config "${BUILD_CONFIG}" --target OrcaSlicer
+	echo "Building OrcaSlicer_profile_validator .."
+	print_and_run cmake --build $BUILD_DIR --config "${BUILD_CONFIG}" --target OrcaSlicer_profile_validator
+	./scripts/run_gettext.sh
+    fi
     if [[ -n "${BUILD_TESTS}" ]] ; then
 	echo "Building tests ..."
 	print_and_run cmake --build ${BUILD_DIR} --config "${BUILD_CONFIG}" --target tests/all
diff --git a/doc/developer-reference/How-to-test.md b/doc/developer-reference/How-to-test.md
index 2929384b1f..5268e02304 100644
--- a/doc/developer-reference/How-to-test.md
+++ b/doc/developer-reference/How-to-test.md
@@ -10,18 +10,38 @@ Can be built when you are building Orca Slicer binary by including the `-t` flag
 build_linux.sh -st
 ```
 
-Test binaries will then appear under `build/tests`. As of this writing, not all tests will be built.
+(or `-ster` or `-stb` etc).
+
+When running `build_linux.sh` with `-t`, make sure you always include the `-e` or `-b` flag if you built the binary with them, otherwise you'll rebuild all of OrcaSlicer again before the tests are ready.
+
+Test binaries will then appear under `build/tests` or `build-dbginfo/tests` or `build-dbg/tests`. As of this writing, not all tests will be built.
+
+For rebuilding after changes, you can look into `build_linux.sh` for the cmake command which triggers the build, but it should be something like:
+
+```
+# Obviously only use the appropriate one
+BUILD_CONFIG=Release
+BUILD_CONFIG=RelWithDebInfo
+cd $BUILD_DIR # build or build-dbginfo probably
+
+cmake --build . --config $BUILD_CONFIG --target tests/all
+# or
+cmake --build . --config $BUILD_CONFIG --target libslic3r_tests
+# etc
+```
 
 ## Run Unit Tests
 
 ### Run All
 
 ```
-ctest --test-dir build/tests
+cd $BUILD_DIR # build or build-dbginfo probably
+ctest --test-dir tests
 ```
 
 ### Run a Specific Set
 
 ```
-ctest --test-dir build/tests/slic3rutils
+cd $BUILD_DIR # build or build-dbginfo probably
+ctest --test-dir tests/slic3rutils
 ```