🔨 Build scripts cleanup (#27157)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

buildroot/share/PlatformIO/scripts/STM32F1_build_flags.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+#
+# STM32F1_build_flags.py
+# Add build_flags for the base STM32F1_maple environment (stm32f1-maple.ini)
+#
+from __future__ import print_function
+import sys
+
+# Dynamic build flags for generic compile options
+if __name__ == "__main__":
+
+    # Print these plus the given args when running directly on the command-line
+    args = [
+        "-std=gnu++14",
+        "-Os",
+        "-mcpu=cortex-m3",
+        "-mthumb",
+
+        "-fsigned-char",
+        "-fno-move-loop-invariants",
+        "-fno-strict-aliasing",
+        "-fsingle-precision-constant",
+
+        "--specs=nano.specs",
+        "--specs=nosys.specs",
+
+        "-MMD", "-MP",
+
+        "-IMarlin/src/HAL/STM32F1",
+
+        "-DTARGET_STM32F1",
+        "-DARDUINO_ARCH_STM32",
+        "-DPLATFORM_M997_SUPPORT"
+    ] + sys.argv[1:]
+
+    print(" ".join(args))
+
+else:
+
+    # Extra script for stm32f1-maple.ini build_flags
+
+    import pioutil
+    if pioutil.is_pio_build():
+        pioutil.env.Append(
+            ARFLAGS=["rcs"],
+
+            ASFLAGS=["-x", "assembler-with-cpp"],
+
+            CXXFLAGS=[
+                "-fabi-version=0",
+                "-fno-use-cxa-atexit",
+                "-fno-threadsafe-statics"
+            ],
+            LINKFLAGS=[
+                "-Os",
+                "-mcpu=cortex-m3",
+                "-ffreestanding",
+                "-mthumb",
+                "--specs=nano.specs",
+                "--specs=nosys.specs",
+                "-u_printf_float",
+            ],
+        )