Makefile: avoid error message from 'uname -o'

diff --git a/Makefile b/Makefile
index 7ca77cf2af012aa4a6d936425e518618af9dd625..a201187395d0102ab8b807d9ae78cb794c1df99a 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -166,11 +166,19 @@ LIBS += -lz
 #
 # Platform specific tweaks
 #
-ifeq ($(shell uname -s),Darwin)
+
+# We choose to avoid "if .. else if .. else .. endif endif"
+# because maintaining the nesting to match is a pain.  If
+# we had "elif" things would have been much nicer...
+uname_S := $(shell sh -c 'uname -s 2>/dev/null || echo not')
+uname_M := $(shell sh -c 'uname -m 2>/dev/null || echo not')
+uname_O := $(shell sh -c 'uname -o 2>/dev/null || echo not')
+
+ifeq ($(uname_S),Darwin)
        NEEDS_SSL_WITH_CRYPTO = YesPlease
        NEEDS_LIBICONV = YesPlease
 endif
-ifeq ($(shell uname -s),SunOS)
+ifeq ($(uname_S),SunOS)
        NEEDS_SOCKET = YesPlease
        NEEDS_NSL = YesPlease
        SHELL_PATH = /bin/bash
@@ -180,20 +188,20 @@ ifeq ($(shell uname -s),SunOS)
        TAR = gtar
        PLATFORM_DEFINES += -D__EXTENSIONS__
 endif
-ifeq ($(shell uname -o),Cygwin)
+ifeq ($(uname_O),Cygwin)
        NO_STRCASESTR = YesPlease
        NEEDS_LIBICONV = YesPlease
        NO_IPV6 = YesPlease
        X = .exe
        PLATFORM_DEFINES += -DUSE_SYMLINK_HEAD=0
 endif
-ifneq (,$(findstring arm,$(shell uname -m)))
-       ARM_SHA1 = YesPlease
-endif
-ifeq ($(shell uname -s),OpenBSD)
+ifeq ($(uname_S),OpenBSD)
        NEEDS_LIBICONV = YesPlease
        PLATFORM_DEFINES += -I/usr/local/include -L/usr/local/lib
 endif
+ifneq (,$(findstring arm,$(uname_M)))
+       ARM_SHA1 = YesPlease
+endif
 
 ifndef NO_CURL
        ifdef CURLDIR
@@ -293,7 +301,7 @@ SCRIPTS = $(patsubst %.sh,%,$(SCRIPT_SH)) \
          $(patsubst %.py,%,$(SCRIPT_PYTHON)) \
          gitk
 
-export TAR INSTALL DESTDIR SHELL_PATH
+export prefix TAR INSTALL DESTDIR SHELL_PATH
 ### Build rules
 
 all: $(PROGRAMS) $(SCRIPTS)