Merge branch 'mh/notes-cleanup'

diff --git a/Makefile b/Makefile
index f2bb7f2f63e458af6261b4a151d87ef9e973222e..68948dfbf3f29531d41be591daa9a8ba8df72708 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -162,6 +162,11 @@ all::
 # algorithm. This is slower, but may detect attempted collision attacks.
 # Takes priority over other *_SHA1 knobs.
 #
+# Define DC_SHA1_EXTERNAL in addition to DC_SHA1 if you want to build / link
+# git with the external SHA1 collision-detect library.
+# Without this option, i.e. the default behavior is to build git with its
+# own built-in code (or submodule).
+#
 # Define DC_SHA1_SUBMODULE in addition to DC_SHA1 to use the
 # sha1collisiondetection shipped as a submodule instead of the
 # non-submodule copy in sha1dc/. This is an experimental option used
@@ -1475,6 +1480,15 @@ ifdef APPLE_COMMON_CRYPTO
        BASIC_CFLAGS += -DSHA1_APPLE
 else
        DC_SHA1 := YesPlease
+       BASIC_CFLAGS += -DSHA1_DC
+       LIB_OBJS += sha1dc_git.o
+ifdef DC_SHA1_EXTERNAL
+       ifdef DC_SHA1_SUBMODULE
+$(error Only set DC_SHA1_EXTERNAL or DC_SHA1_SUBMODULE, not both)
+       endif
+       BASIC_CFLAGS += -DDC_SHA1_EXTERNAL
+       EXTLIBS += -lsha1detectcoll
+else
 ifdef DC_SHA1_SUBMODULE
        LIB_OBJS += sha1collisiondetection/lib/sha1.o
        LIB_OBJS += sha1collisiondetection/lib/ubc_check.o
@@ -1484,17 +1498,15 @@ else
        LIB_OBJS += sha1dc/ubc_check.o
 endif
        BASIC_CFLAGS += \
-               -DSHA1_DC \
                -DSHA1DC_NO_STANDARD_INCLUDES \
                -DSHA1DC_INIT_SAFE_HASH_DEFAULT=0 \
                -DSHA1DC_CUSTOM_INCLUDE_SHA1_C="\"cache.h\"" \
-               -DSHA1DC_CUSTOM_TRAILING_INCLUDE_SHA1_C="\"sha1dc_git.c\"" \
-               -DSHA1DC_CUSTOM_TRAILING_INCLUDE_SHA1_H="\"sha1dc_git.h\"" \
                -DSHA1DC_CUSTOM_INCLUDE_UBC_CHECK_C="\"git-compat-util.h\""
 endif
 endif
 endif
 endif
+endif
 
 ifdef SHA1_MAX_BLOCK_SIZE
        LIB_OBJS += compat/sha1-chunked.o