Compile OpenSSL from source on OSX

I'm seeing a bunch of weird illegal instructions on OSX nightlies for
Cargo. My guess is that they're all related to OpenSSL linking. Right
now we're linking from Homebrew but I have a sneaking suspicion that it
compiles with `-march=native` rather than what we'd like as a portable
binary. To work around this compile OpenSSL ourselves and link it that
way.

Note that I believe this won't bring in the certificate trust store of
OpenSSL on OSX (or at least not the right one from the keychain). We
shouldn't need that, however, as OpenSSL is just used as the
cryptographic primitives in libssh2 and Cargo itself. So in that sense
we shouldn't need it for actually SSL at all.

.travis.yml

@@ -29,7 +29,6 @@ matrix:
            MACOSX_DEPLOYMENT_TARGET=10.7
            CFG_DISABLE_CROSS_TESTS=1
       os: osx
-      install: brew uninstall openssl && brew install openssl --universal --without-test
 
     # stable musl target, tested
     - env: TARGET=x86_64-unknown-linux-musl

Makefile.in

@@ -172,17 +172,19 @@ OPENSSL_OS_aarch64-unknown-linux-gnu := linux-aarch64
 OPENSSL_OS_arm-unknown-linux-gnueabi := linux-armv4
 OPENSSL_OS_arm-unknown-linux-gnueabihf := linux-armv4
 OPENSSL_OS_armv7-unknown-linux-gnueabihf := linux-armv4
+OPENSSL_OS_i686-apple-darwin := darwin-i386-cc
 OPENSSL_OS_i686-unknown-freebsd := BSD-x86-elf
 OPENSSL_OS_i686-unknown-linux-gnu := linux-elf
 OPENSSL_OS_i686-unknown-linux-musl := linux-elf
 OPENSSL_OS_mips-unknown-linux-gnu := linux-mips32
-OPENSSL_OS_mipsel-unknown-linux-gnu := linux-mips32
 OPENSSL_OS_mips64-unknown-linux-gnuabi64 := linux64-mips64
 OPENSSL_OS_mips64el-unknown-linux-gnuabi64 := linux64-mips64
+OPENSSL_OS_mipsel-unknown-linux-gnu := linux-mips32
 OPENSSL_OS_powerpc-unknown-linux-gnu := linux-ppc
 OPENSSL_OS_powerpc64-unknown-linux-gnu := linux-ppc64
 OPENSSL_OS_powerpc64le-unknown-linux-gnu := linux-ppc64le
 OPENSSL_OS_s390x-unknown-linux-gnu := linux64-s390x
+OPENSSL_OS_x86_64-apple-darwin := darwin64-x86_64-cc
 OPENSSL_OS_x86_64-unknown-freebsd := BSD-x86_64
 OPENSSL_OS_x86_64-unknown-linux-gnu := linux-x86_64
 OPENSSL_OS_x86_64-unknown-linux-musl := linux-x86_64
@@ -192,6 +194,7 @@ OPENSSL_AR_aarch64-unknown-linux-gnu := aarch64-linux-gnu-ar
 OPENSSL_AR_arm-unknown-linux-gnueabi := arm-linux-gnueabi-ar
 OPENSSL_AR_arm-unknown-linux-gnueabihf := arm-linux-gnueabihf-ar
 OPENSSL_AR_armv7-unknown-linux-gnueabihf := armv7-linux-gnueabihf-ar
+OPENSSL_AR_i686-apple-darwin := ar
 OPENSSL_AR_i686-unknown-freebsd := i686-unknown-freebsd10-ar
 OPENSSL_AR_i686-unknown-linux-gnu := ar
 OPENSSL_AR_i686-unknown-linux-musl := ar
@@ -203,6 +206,7 @@ OPENSSL_AR_powerpc-unknown-linux-gnu := powerpc-linux-gnu-ar
 OPENSSL_AR_powerpc64-unknown-linux-gnu := powerpc64-linux-gnu-ar
 OPENSSL_AR_powerpc64le-unknown-linux-gnu := powerpc64le-linux-gnu-ar
 OPENSSL_AR_s390x-unknown-linux-gnu := s390x-linux-gnu-ar
+OPENSSL_AR_x86_64-apple-darwin := ar
 OPENSSL_AR_x86_64-unknown-freebsd := x86_64-unknown-freebsd10-ar
 OPENSSL_AR_x86_64-unknown-linux-gnu := ar
 OPENSSL_AR_x86_64-unknown-linux-musl := ar
@@ -211,6 +215,7 @@ OPENSSL_CC_aarch64-unknown-linux-gnu := aarch64-linux-gnu-gcc
 OPENSSL_CC_arm-unknown-linux-gnueabi := arm-linux-gnueabi-gcc
 OPENSSL_CC_arm-unknown-linux-gnueabihf := arm-linux-gnueabihf-gcc
 OPENSSL_CC_armv7-unknown-linux-gnueabihf := armv7-linux-gnueabihf-gcc
+OPENSSL_CC_i686-apple-darwin := clang
 OPENSSL_CC_i686-unknown-freebsd := i686-unknown-freebsd10-gcc
 OPENSSL_CC_i686-unknown-linux-gnu := gcc
 OPENSSL_CC_i686-unknown-linux-musl := musl-gcc
@@ -222,18 +227,17 @@ OPENSSL_CC_powerpc-unknown-linux-gnu := powerpc-linux-gnu-gcc
 OPENSSL_CC_powerpc64-unknown-linux-gnu := powerpc64-linux-gnu-gcc-5
 OPENSSL_CC_powerpc64le-unknown-linux-gnu := powerpc64le-linux-gnu-gcc
 OPENSSL_CC_s390x-unknown-linux-gnu := s390x-linux-gnu-gcc
+OPENSSL_CC_x86_64-apple-darwin := clang
 OPENSSL_CC_x86_64-unknown-freebsd := x86_64-unknown-freebsd10-gcc
 OPENSSL_CC_x86_64-unknown-linux-gnu := gcc
 OPENSSL_CC_x86_64-unknown-linux-musl := musl-gcc
 OPENSSL_CC_x86_64-unknown-netbsd := x86_64-unknown-netbsd-gcc
 
 SETARCH_i686-unknown-linux-gnu := setarch i386
+OPENSSL_CFLAGS_i686-apple-darwin := -m32
 OPENSSL_CFLAGS_i686-unknown-linux-gnu := -m32
 OPENSSL_CFLAGS_i686-unknown-linux-musl := -m32
 
-LIPO_FAMILY_i686-apple-darwin := i386
-LIPO_FAMILY_x86_64-apple-darwin := x86_64
-
 define BUILD_OPENSSL
 
 ifdef CFG_ENABLE_NIGHTLY
@@ -265,30 +269,7 @@ test-unit-$(1): export OPENSSL_DIR := $$(OPENSSL_INSTALL_$(1))
 # build libz statically into the cargo we're producing
 cargo-$(1): export LIBZ_SYS_STATIC := 1
 
-else ifdef LIPO_FAMILY_$(1)
-
-target/openssl/$(1).stamp:
-	@echo installing from `brew --prefix openssl`
-	@rm -rf $$(OPENSSL_INSTALL_$(1))
-	mkdir -p $$(OPENSSL_INSTALL_$(1))/lib
-	cp -r `brew --prefix openssl`/include $$(OPENSSL_INSTALL_$(1))/include
-	cp -r `brew --prefix openssl`/lib/pkgconfig $$(OPENSSL_INSTALL_$(1))/lib/pkgconfig
-	lipo -output $$(OPENSSL_INSTALL_$(1))/lib/libssl.a \
-		-extract_family $$(LIPO_FAMILY_$(1)) \
-		`brew --prefix openssl`/lib/libssl.a || \
-		cp `brew --prefix openssl`/lib/libssl.a \
-			$$(OPENSSL_INSTALL_$(1))/lib/libssl.a
-	lipo -output $$(OPENSSL_INSTALL_$(1))/lib/libcrypto.a \
-		-extract_family $$(LIPO_FAMILY_$(1)) \
-		`brew --prefix openssl`/lib/libcrypto.a || \
-		cp `brew --prefix openssl`/lib/libcrypto.a \
-			$$(OPENSSL_INSTALL_$(1))/lib/libcrypto.a
-	touch $$@
-
-cargo-$(1): export OPENSSL_DIR := $$(OPENSSL_INSTALL_$(1))
-test-unit-$(1): export OPENSSL_DIR := $$(OPENSSL_INSTALL_$(1))
-
-else # !OPENSSL_OS_$(1) && !OSX
+else # !OPENSSL_OS_$(1)
 target/openssl/$(1).stamp:
 
 endif
@@ -301,10 +282,17 @@ endef
 
 $(foreach target,$(CFG_TARGET),$(eval $(call BUILD_OPENSSL,$(target))))
 
+ifeq ($(shell uname),Darwin)
+SHASUM := shasum -a 256
+else
+SHASUM := sha256sum
+endif
+
 target/openssl/openssl-$(OPENSSL_VERS).tar.gz: | target/openssl/
-	curl -o $(@) https://www.openssl.org/source/openssl-$(OPENSSL_VERS).tar.gz
-	sha256sum $(@) > $(@).sha256
+	curl -o $(@).tmp https://www.openssl.org/source/openssl-$(OPENSSL_VERS).tar.gz
+	$(SHASUM) $(@).tmp > $(@).sha256
 	test $(OPENSSL_SHA256) = `cut -d ' ' -f 1 $(@).sha256`
+	mv $(@).tmp $(@)
 
 target/openssl/:
 	mkdir -p $(@)