godot/drivers/png/SCsub
Rémi Verschelde c7b53c03ae
SCons: Add explicit dependencies on thirdparty code in cloned env
Since we clone the environments to build thirdparty code, we don't get an
explicit dependency on the build objects produced by that environment.

So when we update thirdparty code, Godot code using it is not necessarily
rebuilt (I think it is for changed headers, but not for changed .c/.cpp files),
which can lead to an invalid compilation output (linking old Godot .o files
with a newer, potentially ABI breaking version of thirdparty code).

This was only seen as really problematic with bullet updates (leading to
crashes when rebuilding Godot after a bullet update without cleaning .o files),
but it's safer to fix it everywhere, even if it's a LOT of hacky boilerplate.
2020-12-18 10:29:34 +01:00

72 lines
2.0 KiB
Python

#!/usr/bin/env python
Import("env")
env_png = env.Clone()
# Thirdparty source files
thirdparty_obj = []
if env["builtin_libpng"]:
thirdparty_dir = "#thirdparty/libpng/"
thirdparty_sources = [
"png.c",
"pngerror.c",
"pngget.c",
"pngmem.c",
"pngpread.c",
"pngread.c",
"pngrio.c",
"pngrtran.c",
"pngrutil.c",
"pngset.c",
"pngtrans.c",
"pngwio.c",
"pngwrite.c",
"pngwtran.c",
"pngwutil.c",
]
thirdparty_sources = [thirdparty_dir + file for file in thirdparty_sources]
env_png.Prepend(CPPPATH=[thirdparty_dir])
# Needed for drivers includes and in platform/javascript
env.Prepend(CPPPATH=[thirdparty_dir])
# Currently .ASM filter_neon.S does not compile on NT.
import os
use_neon = "neon_enabled" in env and env["neon_enabled"] and os.name != "nt"
if use_neon:
env_png.Append(CPPDEFINES=[("PNG_ARM_NEON_OPT", 2)])
else:
env_png.Append(CPPDEFINES=[("PNG_ARM_NEON_OPT", 0)])
env_thirdparty = env_png.Clone()
env_thirdparty.disable_warnings()
env_thirdparty.add_source_files(thirdparty_obj, thirdparty_sources)
if use_neon:
env_neon = env_thirdparty.Clone()
if "S_compiler" in env:
env_neon["CC"] = env["S_compiler"]
neon_sources = []
neon_sources.append(env_neon.Object(thirdparty_dir + "/arm/arm_init.c"))
neon_sources.append(env_neon.Object(thirdparty_dir + "/arm/filter_neon_intrinsics.c"))
neon_sources.append(env_neon.Object(thirdparty_dir + "/arm/filter_neon.S"))
neon_sources.append(env_neon.Object(thirdparty_dir + "/arm/palette_neon_intrinsics.c"))
thirdparty_obj += neon_sources
env.drivers_sources += thirdparty_obj
# Godot source files
driver_obj = []
env_png.add_source_files(driver_obj, "*.cpp")
env.drivers_sources += driver_obj
# Needed to force rebuilding the driver files when the thirdparty library is updated.
env.Depends(driver_obj, thirdparty_obj)