From e03c249cc5931ee8b0f1d915eab9ccff40ac996f Mon Sep 17 00:00:00 2001
From: rdb <git@rdb.name>
Date: Fri, 24 Nov 2017 17:47:22 +0100
Subject: [PATCH] makepanda: write target platform to file, rebuild if platform
 changes

---
 makepanda/makepanda.py     | 66 ++++++++++++++++++++++++++++++++++++++
 makepanda/makepandacore.py |  6 +++-
 2 files changed, 71 insertions(+), 1 deletion(-)

diff --git a/makepanda/makepanda.py b/makepanda/makepanda.py
index 7efa6ea1f7..d9e4755412 100755
--- a/makepanda/makepanda.py
+++ b/makepanda/makepanda.py
@@ -22,6 +22,7 @@ except:
 
 from makepandacore import *
 from installpanda import *
+from distutils.util import get_platform
 import time
 import os
 import sys
@@ -68,6 +69,7 @@ WINDOWS_SDK = None
 MSVC_VERSION = None
 BOOUSEINTELCOMPILER = False
 OPENCV_VER_23 = False
+PLATFORM = None
 
 if "MACOSX_DEPLOYMENT_TARGET" in os.environ:
     OSXTARGET=os.environ["MACOSX_DEPLOYMENT_TARGET"]
@@ -384,6 +386,67 @@ MAJOR_VERSION = '.'.join(VERSION.split('.')[:2])
 if P3DSUFFIX is None:
     P3DSUFFIX = MAJOR_VERSION
 
+# Now determine the distutils-style platform tag for the target system.
+target = GetTarget()
+if target == 'windows':
+    if GetTargetArch() == 'x64':
+        PLATFORM = 'win-amd64'
+    else:
+        PLATFORM = 'win32'
+
+elif target == 'darwin':
+    if OSXTARGET:
+        osxver = OSXTARGET
+    else:
+        maj, min = platform.mac_ver()[0].split('.')[:2]
+        osxver = int(maj), int(min)
+
+    arch_tag = None
+    if not OSX_ARCHS:
+        arch_tag = GetTargetArch()
+    elif len(OSX_ARCHS) == 1:
+        arch_tag = OSX_ARCHS[0]
+    elif frozenset(OSX_ARCHS) == frozenset(('i386', 'ppc')):
+        arch_tag = 'fat'
+    elif frozenset(OSX_ARCHS) == frozenset(('x86_64', 'i386')):
+        arch_tag = 'intel'
+    elif frozenset(OSX_ARCHS) == frozenset(('x86_64', 'ppc64')):
+        arch_tag = 'fat64'
+    elif frozenset(OSX_ARCHS) == frozenset(('x86_64', 'i386', 'ppc')):
+        arch_tag = 'fat32'
+    else:
+        raise RuntimeError('No arch tag for arch combination %s' % OSX_ARCHS)
+
+    PLATFORM = 'macosx-{0}.{1}-{2}'.format(osxver[0], osxver[1], arch_tag)
+
+elif target == 'linux' and os.path.isfile("/lib/libc-2.5.so") and os.path.isdir("/opt/python"):
+    # This is manylinux1.  A bit of a sloppy check, though.
+    if GetTargetArch() in ('x86_64', 'amd64'):
+        PLATFORM = 'manylinux1-x86_64'
+    else:
+        PLATFORM = 'manylinux1-i686'
+
+elif not CrossCompiling():
+    if HasTargetArch():
+        # Replace the architecture in the platform string.
+        platform_parts = get_platform().rsplit('-', 1)
+        target_arch = GetTargetArch()
+        if target_arch == 'amd64':
+            target_arch = 'x86_64'
+        PLATFORM = platform_parts[0] + '-' + target_arch
+    else:
+        # We're not cross-compiling; just take the host arch.
+        PLATFORM = get_platform()
+
+else:
+    target_arch = GetTargetArch()
+    if target_arch == 'amd64':
+        target_arch = 'x86_64'
+    PLATFORM = '{0}-{1}' % (target, target_arch)
+
+
+print("Platform: %s" % PLATFORM)
+
 outputdir_suffix = ""
 
 if (RUNTIME or RTDIST):
@@ -2485,6 +2548,9 @@ def WriteConfigSettings():
         if (PkgSkip(x)): ConditionalWriteFile(GetOutputDir() + '/tmp/dtool_have_'+x.lower()+'.dat', "0\n")
         else:            ConditionalWriteFile(GetOutputDir() + '/tmp/dtool_have_'+x.lower()+'.dat', "1\n")
 
+    # Finally, write a platform.dat with the platform we are compiling for.
+    ConditionalWriteFile(GetOutputDir() + '/tmp/platform.dat', PLATFORM)
+
 WriteConfigSettings()
 
 WarnConflictingFiles()
diff --git a/makepanda/makepandacore.py b/makepanda/makepandacore.py
index 6705c72a1f..bfb2600f08 100644
--- a/makepanda/makepandacore.py
+++ b/makepanda/makepandacore.py
@@ -3191,10 +3191,14 @@ def TargetAdd(target, dummy=0, opts=[], input=[], dep=[], ipath=None, winrc=None
     if winrc and GetTarget() == 'windows':
         TargetAdd(target, input=WriteResourceFile(target.split("/")[-1].split(".")[0], **winrc))
 
-    if target.endswith(".in"):
+    ext = os.path.splitext(target)[1]
+    if ext == ".in":
         if not CrossCompiling():
             t.deps[FindLocation("interrogate.exe", [])] = 1
         t.deps[FindLocation("dtool_have_python.dat", [])] = 1
 
+    if ext in (".obj", ".tlb", ".res", ".plugin", ".app") or ext in SUFFIX_DLL or ext in SUFFIX_LIB:
+        t.deps[FindLocation("platform.dat", [])] = 1
+
     if target.endswith(".pz") and not CrossCompiling():
         t.deps[FindLocation("pzip.exe", [])] = 1