From 1d1b3a0be5bc3bb6ec6cd41ab13e57442395fc30 Mon Sep 17 00:00:00 2001
From: Tim Northover <tnorthover@apple.com>
Date: Wed, 11 Dec 2013 11:25:53 +0000
Subject: Only build embedded darwin variants if the compiler supports them

We need to filter out architectures that the compiler hasn't been built to
target (most likely the ARM ones) before attemptint to build a version of
libcompiler_rt.

This can result in a completely empty library (e.g. soft-float doesn't have any
x86 variants), in which case we shouldn't even try the build

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@197028 91177308-0d34-0410-b5e6-96231b3b80d8
---
 make/platform/clang_darwin_embedded.mk | 35 ++++++++++++++++++++++++++--------
 1 file changed, 27 insertions(+), 8 deletions(-)

(limited to 'make')

diff --git a/make/platform/clang_darwin_embedded.mk b/make/platform/clang_darwin_embedded.mk
index 3cea2e45c..4398c12ee 100644
--- a/make/platform/clang_darwin_embedded.mk
+++ b/make/platform/clang_darwin_embedded.mk
@@ -6,6 +6,25 @@
 
 Description := Static runtime libraries for embedded clang/Darwin
 
+# A function that ensures we don't try to build for architectures that we
+# don't have working toolchains for.
+CheckArches = \
+  $(shell \
+    result=""; \
+    for arch in $(1); do \
+      if $(CC) -arch $$arch -c \
+	  -integrated-as \
+	  $(ProjSrcRoot)/make/platform/clang_darwin_test_input.c \
+	  -isysroot $(ProjSrcRoot)/SDKs/darwin \
+	  -o /dev/null > /dev/null 2> /dev/null; then \
+        result="$$result$$arch "; \
+      else \
+	printf 1>&2 \
+	  "warning: clang_darwin.mk: dropping arch '$$arch' from lib '$(2)'\n"; \
+      fi; \
+    done; \
+    echo $$result)
+
 XCRun = \
   $(shell \
     result=`xcrun -find $(1) 2> /dev/null`; \
@@ -27,20 +46,20 @@ UniversalArchs :=
 # Soft-float version of the runtime. No floating-point instructions will be used
 # and the ABI (out of necessity) passes floating values in normal registers:
 # non-VFP variant of the AAPCS.
-Configs += soft_static
-UniversalArchs.soft_static := armv6m armv7m armv7em armv7
+UniversalArchs.soft_static := $(call CheckArches,armv6m armv7m armv7em armv7,soft_static)
+Configs += $(if $(UniversalArchs.soft_static),soft_static)
 
 # Hard-float version of the runtime. On ARM VFP instructions and registers are
 # allowed, and floating point values get passed in them. VFP variant of the
 # AAPCS.
-Configs += hard_static
-UniversalArchs.hard_static := armv7em armv7 i386 x86_64
+UniversalArchs.hard_static := $(call CheckArches,armv7em armv7 i386 x86_64,hard_static)
+Configs += $(if $(UniversalArchs.hard_static),hard_static)
 
-Configs += soft_pic
-UniversalArchs.soft_pic := armv6m armv7m armv7em armv7
+UniversalArchs.soft_pic := $(call CheckArches,armv6m armv7m armv7em armv7,soft_pic)
+Configs += $(if $(UniversalArchs.soft_pic),soft_pic)
 
-Configs += hard_pic
-UniversalArchs.hard_pic := armv7em armv7 i386 x86_64
+UniversalArchs.hard_pic := $(call CheckArches,armv7em armv7 i386 x86_64,hard_pic)
+Configs += $(if $(UniversalArchs.hard_pic),hard_pic)
 
 CFLAGS := -Wall -Werror -Oz -fomit-frame-pointer -ffreestanding
 
-- 
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