[cmucl-commit] [git] CMU Common Lisp branch master updated. snapshot-2012-05-19-g86f6dcc

[Raymond Toy]

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- Log -----------------------------------------------------------------
commit 86f6dccd0b106765670265e0cf0c7ce2e6a84b55
Author: Raymond Toy <toy.raymond at gmail.com>
Date:   Sat Jun 2 15:02:00 2012 -0700

    Add comments about using clang instead of gcc on x86.

diff --git a/src/lisp/Config.x86_common b/src/lisp/Config.x86_common
index 5ed23de..0fa9bb3 100644
--- a/src/lisp/Config.x86_common
+++ b/src/lisp/Config.x86_common
@@ -45,7 +45,24 @@ ifdef FEATURE_UNICODE
 CPP_DEFINE_OPTIONS += -DUNICODE
 endif
 
+# Default to using gcc
 CC = gcc
+
+# But we can use clang.
+#
+# However, clang seems to want to use SSE instructions in various
+# places, but we DON'T want that because we need a lisp that will run
+# on chips without sse.
+#
+# But on Mac, every machine has SSE2 so we can use SSE2.  However,
+# there's some code path through GC or allocation where we aren't
+# saving the FPU state so after GC or allocation, some XMM FP
+# registers are corrupted.  
+#
+# Got that?
+
+#CC = clang -mno-sse
+
 LD = ld
 
 ifeq ($(filter 2% 3%, $(shell $(CC) -dumpversion)),)
@@ -70,3 +87,7 @@ DEPEND_FLAGS =
 # -ffloat-store and -fno-strict-aliasing anymore.
 e_rem_pio2.o : e_rem_pio2.c
 	$(CC) -c $(CFLAGS) $(CPPFLAGS) $<
+
+# 
+gencgc.o : gencgc.c
+	$(CC) -c -mno-sse $(CFLAGS) $(CPPFLAGS) $<
\ No newline at end of file

-----------------------------------------------------------------------

Summary of changes:
 src/lisp/Config.x86_common |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)


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