Expand documentation describing --signoff

diff --git a/Makefile b/Makefile
index 944d2c3af5140fdbf739f820610a36b7729d0518..37e2d9e1861295361d08b3f2cc0f3dcc584acdc9 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -144,6 +144,10 @@ all::
 # Define PPC_SHA1 environment variable when running make to make use of
 # a bundled SHA1 routine optimized for PowerPC.
 #
+# Define SHA1_MAX_BLOCK_SIZE to limit the amount of data that will be hashed
+# in one call to the platform's SHA1_Update(). e.g. APPLE_COMMON_CRYPTO
+# wants 'SHA1_MAX_BLOCK_SIZE=1024L*1024L*1024L' defined.
+#
 # Define NEEDS_CRYPTO_WITH_SSL if you need -lcrypto when using -lssl (Darwin).
 #
 # Define NEEDS_SSL_WITH_CRYPTO if you need -lssl when using -lcrypto (Darwin).
@@ -1340,6 +1344,11 @@ ifdef NO_POSIX_GOODIES
        BASIC_CFLAGS += -DNO_POSIX_GOODIES
 endif
 
+ifdef APPLE_COMMON_CRYPTO
+       # Apple CommonCrypto requires chunking
+       SHA1_MAX_BLOCK_SIZE = 1024L*1024L*1024L
+endif
+
 ifdef BLK_SHA1
        SHA1_HEADER = "block-sha1/sha1.h"
        LIB_OBJS += block-sha1/sha1.o
@@ -1358,6 +1367,10 @@ endif
 endif
 endif
 
+ifdef SHA1_MAX_BLOCK_SIZE
+       LIB_OBJS += compat/sha1-chunked.o
+       BASIC_CFLAGS += -DSHA1_MAX_BLOCK_SIZE="$(SHA1_MAX_BLOCK_SIZE)"
+endif
 ifdef NO_PERL_MAKEMAKER
        export NO_PERL_MAKEMAKER
 endif