diff --git a/.travis.yml b/.travis.yml
index 8858cd0f9bd7a4..70388987731d97 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -78,14 +78,15 @@ before_install:
         contrib/travis_fastfail.sh || exit 1;
         brew tap staticfloat/julia;
         brew rm --force $(brew deps --HEAD julia);
+        brew install -v staticfloat/juliadeps/libgfortran;
         brew install -v --only-dependencies --HEAD julia;
-        brew install -v staticfloat/juliadeps/libgfortran llvm39-julia;
-        BUILDOPTS="-j3 USECLANG=1 LLVM_CONFIG=$(brew --prefix llvm39-julia)/bin/llvm-config LLVM_SIZE=$(brew --prefix llvm39-julia)/bin/llvm-size";
+        BUILDOPTS="-j3 USECLANG=1 LLVM_CONFIG=$(brew --prefix llvm37-julia)/bin/llvm-config-3.7 LLVM_SIZE=$(brew --prefix llvm37-julia)/bin/llvm-size-3.7";
         BUILDOPTS="$BUILDOPTS VERBOSE=1 USE_BLAS64=0 SUITESPARSE_INC=-I$(brew --prefix suite-sparse-julia)/include FORCE_ASSERTIONS=1";
         BUILDOPTS="$BUILDOPTS LIBBLAS=-lopenblas LIBBLASNAME=libopenblas LIBLAPACK=-lopenblas LIBLAPACKNAME=libopenblas";
         for lib in LLVM SUITESPARSE ARPACK BLAS FFTW LAPACK GMP MPFR PCRE LIBUNWIND; do
             export BUILDOPTS="$BUILDOPTS USE_SYSTEM_$lib=1";
         done;
+        export CXXFLAGS=-DUSE_ORCJIT;
         export LDFLAGS="-L$(brew --prefix openblas-julia)/lib -L$(brew --prefix suite-sparse-julia)/lib";
         export DYLD_FALLBACK_LIBRARY_PATH="/usr/local/lib:/lib:/usr/lib:$(brew --prefix openblas-julia)/lib:$(brew --prefix suite-sparse-julia)/lib:$(brew --prefix arpack-julia)/lib";
         export JULIA_MACOS_SPAWN="DYLD_FALLBACK_LIBRARY_PATH=\"$DYLD_FALLBACK_LIBRARY_PATH\" \$1";
@@ -101,7 +102,7 @@ script:
     # capture the log, but only print it if `make deps` fails
     # try to show the end of the log first, because this log might be very long (> 4MB)
     # and thus be truncated by travis
-    - moreutils/mispipe "make $BUILDOPTS NO_GIT=1 -C deps 2> deps-err.log" "$BAR" > deps.log ||
+    - moreutils/mispipe "make $BUILDOPTS VERBOSE=0 -C deps 2> deps-err.log" "$BAR" > deps.log ||
         { echo "-- deps build log stderr tail 100 --------------------------------------";
           tail -n 100 deps-err.log;
           echo "-- deps build log stdout tail 100 --------------------------------------";
diff --git a/LICENSE.md b/LICENSE.md
index 3a978560641685..c262dfb47f5a84 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -31,7 +31,7 @@ Julia includes code from the following projects, which have their own licenses:
 
 - [crc32c.c](http://stackoverflow.com/questions/17645167/implementing-sse-4-2s-crc32c-in-software) (CRC-32c checksum code by Mark Adler) [[ZLib](https://opensource.org/licenses/Zlib)].
 - [LDC](https://github.com/ldc-developers/ldc/blob/master/LICENSE) (for ccall/cfunction ABI definitions) [BSD-3]. The portion of code that Julia uses from LDC is [BSD-3] licensed.
-- [LLVM](http://releases.llvm.org/3.9.0/LICENSE.TXT) (for parts of src/jitlayers.cpp and src/disasm.cpp) [BSD-3, effectively]
+- [LLVM](http://llvm.org/releases/3.7.0/LICENSE.TXT) (for parts of src/jitlayers.cpp and src/disasm.cpp) [BSD-3, effectively]
 - [MUSL](http://git.musl-libc.org/cgit/musl/tree/COPYRIGHT) (for getopt implementation on Windows) [MIT]
 - [MINGW](https://sourceforge.net/p/mingw/mingw-org-wsl/ci/legacy/tree/mingwrt/mingwex/dirname.c) (for dirname implementation on Windows) [MIT]
 - [NetBSD](http://www.netbsd.org/about/redistribution.html) (for setjmp, longjmp, and strptime implementations on Windows) [BSD-3]
@@ -43,7 +43,7 @@ own licenses:
 - [FEMTOLISP](https://github.com/JeffBezanson/femtolisp) [BSD-3]
 - [LIBUNWIND](http://git.savannah.gnu.org/gitweb/?p=libunwind.git;a=blob_plain;f=LICENSE;hb=master) [MIT]
 - [LIBUV](https://github.com/joyent/libuv/blob/master/LICENSE) [MIT]
-- [LLVM](http://releases.llvm.org/3.9.0/LICENSE.TXT) [BSD-3, effectively]
+- [LLVM](http://llvm.org/releases/3.7.0/LICENSE.TXT) [BSD-3, effectively]
 - [UTF8PROC](https://github.com/JuliaLang/utf8proc) [MIT]
 
 
diff --git a/Make.inc b/Make.inc
index 8f6cc419eaaf22..8d04d476e66f98 100644
--- a/Make.inc
+++ b/Make.inc
@@ -642,6 +642,7 @@ endif
 # If we are running on powerpc64le or ppc64le, set certain options automatically
 ifneq (,$(filter $(ARCH), powerpc64le ppc64le))
 JCFLAGS += -fsigned-char
+LLVM_VER:=3.9.0
 OPENBLAS_DYNAMIC_ARCH:=0
 OPENBLAS_TARGET_ARCH:=POWER8
 # GCC doesn't do -march= on ppc64le
@@ -656,6 +657,8 @@ endif
 # If we are running on ARM, set certain options automatically
 ifneq (,$(findstring arm,$(ARCH)))
 JCFLAGS += -fsigned-char
+
+LLVM_VER:=3.9.0
 USE_BLAS64:=0
 OPENBLAS_DYNAMIC_ARCH:=0
 OPENBLAS_TARGET_ARCH:=ARMV7
@@ -664,6 +667,7 @@ endif
 
 # If we are running on aarch64 (e.g. ARMv8 or ARM64), set certain options automatically
 ifneq (,$(findstring aarch64,$(ARCH)))
+LLVM_VER:=3.9.0
 OPENBLAS_DYNAMIC_ARCH:=0
 OPENBLAS_TARGET_ARCH:=ARMV8
 endif
diff --git a/README.md b/README.md
index 03d5b204e74143..7bdd41a35e8bac 100644
--- a/README.md
+++ b/README.md
@@ -274,7 +274,7 @@ Building Julia requires that the following software be installed:
 
 Julia uses the following external libraries, which are automatically downloaded (or in a few cases, included in the Julia source repository) and then compiled from source the first time you run `make`:
 
-- **[LLVM]** (3.9)           — compiler infrastructure.
+- **[LLVM]** (3.7)           — compiler infrastructure.
 - **[FemtoLisp]**            — packaged with Julia source, and used to implement the compiler front-end.
 - **[libuv]**                — portable, high-performance event-based I/O library
 - **[OpenLibm]**             — portable libm library containing elementary math functions.
diff --git a/appveyor.yml b/appveyor.yml
index ce5b092071ea90..0d573f4c25f736 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -33,8 +33,8 @@ cache:
 # Cache large downloads to avoid network unreliability
   - i686-4.9.2-release-win32-sjlj-rt_v4-rev3.7z
   - x86_64-4.9.2-release-win32-seh-rt_v4-rev3.7z
-  - llvm-3.9.1-i686-w64-mingw32-juliadeps-r02.7z
-  - llvm-3.9.1-x86_64-w64-mingw32-juliadeps-r02.7z
+  - llvm-3.7.1-i686-w64-mingw32-juliadeps-r09.7z
+  - llvm-3.7.1-x86_64-w64-mingw32-juliadeps-r09.7z
   - usr/bin/busybox.exe
 
 build_script:
diff --git a/contrib/windows/msys_build.sh b/contrib/windows/msys_build.sh
index b99561319c54f3..7ada885dbf90e9 100755
--- a/contrib/windows/msys_build.sh
+++ b/contrib/windows/msys_build.sh
@@ -123,7 +123,7 @@ if [ -z "$USEMSVC" ]; then
   fi
   export AR=${CROSS_COMPILE}ar
 
-  f=llvm-3.9.1-$ARCH-w64-mingw32-juliadeps-r02.7z
+  f=llvm-3.7.1-$ARCH-w64-mingw32-juliadeps-r09.7z
 else
   echo "override USEMSVC = 1" >> Make.user
   echo "override ARCH = $ARCH" >> Make.user
@@ -143,6 +143,8 @@ checksum_download \
     "$f" "https://bintray.com/artifact/download/tkelman/generic/$f"
 echo "Extracting $f"
 $SEVENZIP x -y $f >> get-deps.log
+echo 'override LLVM_CONFIG := $(JULIAHOME)/usr/bin/llvm-config.exe' >> Make.user
+echo 'override LLVM_SIZE := $(JULIAHOME)/usr/bin/llvm-size.exe' >> Make.user
 
 if [ -z "`which make 2>/dev/null`" ]; then
   if [ -n "`uname | grep CYGWIN`" ]; then
diff --git a/deps/Versions.make b/deps/Versions.make
index 7e5a0486f99712..f57a6b9fc22692 100644
--- a/deps/Versions.make
+++ b/deps/Versions.make
@@ -1,4 +1,4 @@
-LLVM_VER = 3.9.1
+LLVM_VER = 3.7.1
 PCRE_VER = 10.22
 DSFMT_VER = 2.2.3
 LAPACK_VER = 3.5.0
diff --git a/deps/checksums/cfe-3.3.src.tar.gz/md5 b/deps/checksums/cfe-3.3.src.tar.gz/md5
new file mode 100644
index 00000000000000..72eb5d87216f1a
--- /dev/null
+++ b/deps/checksums/cfe-3.3.src.tar.gz/md5
@@ -0,0 +1 @@
+8284891e3e311829b8e44ac813d0c9ef
diff --git a/deps/checksums/cfe-3.3.src.tar.gz/sha512 b/deps/checksums/cfe-3.3.src.tar.gz/sha512
new file mode 100644
index 00000000000000..c77e6dc8f2e098
--- /dev/null
+++ b/deps/checksums/cfe-3.3.src.tar.gz/sha512
@@ -0,0 +1 @@
+06773f43f7d3529f06edb029f7de398f06a700a0f2476e00c4727e70c291028221bfac23625dfd2c220d6ac91a21670848187a934b99a21801c695127371afcc
diff --git a/deps/checksums/cfe-3.7.0.src.tar.xz/md5 b/deps/checksums/cfe-3.7.0.src.tar.xz/md5
new file mode 100644
index 00000000000000..05e1a3361ab840
--- /dev/null
+++ b/deps/checksums/cfe-3.7.0.src.tar.xz/md5
@@ -0,0 +1 @@
+8f9d27335e7331cf0a4711e952f21f01
diff --git a/deps/checksums/cfe-3.7.0.src.tar.xz/sha512 b/deps/checksums/cfe-3.7.0.src.tar.xz/sha512
new file mode 100644
index 00000000000000..3f84b7f3fa0354
--- /dev/null
+++ b/deps/checksums/cfe-3.7.0.src.tar.xz/sha512
@@ -0,0 +1 @@
+099d34cb019ea548c6ee85efd22b150beba0aa92061394fa3e423b1ebfe4a5c98c0586e5d56fc5c39e2b1606d36db59f442c056cc59473e32df76c8790c9d0ae
diff --git a/deps/checksums/cfe-3.7.1.src.tar.xz/md5 b/deps/checksums/cfe-3.7.1.src.tar.xz/md5
new file mode 100644
index 00000000000000..9cdf1474655c09
--- /dev/null
+++ b/deps/checksums/cfe-3.7.1.src.tar.xz/md5
@@ -0,0 +1 @@
+0acd026b5529164197563d135a8fd83e
diff --git a/deps/checksums/cfe-3.7.1.src.tar.xz/sha512 b/deps/checksums/cfe-3.7.1.src.tar.xz/sha512
new file mode 100644
index 00000000000000..9783b35d29eb83
--- /dev/null
+++ b/deps/checksums/cfe-3.7.1.src.tar.xz/sha512
@@ -0,0 +1 @@
+8e3285a32ad0fd4721fa77c4fb9709f31bb4e4f7cb5245357aaf57b0767b6ef18a30d902b59d1437a6febffb6c2128214f9ce5aa913bb298743221a28c4f9de5
diff --git a/deps/checksums/cfe-3.8.1.src.tar.xz/md5 b/deps/checksums/cfe-3.8.1.src.tar.xz/md5
new file mode 100644
index 00000000000000..b190cebc87a5b2
--- /dev/null
+++ b/deps/checksums/cfe-3.8.1.src.tar.xz/md5
@@ -0,0 +1 @@
+4ff2f8844a786edb0220f490f7896080
diff --git a/deps/checksums/cfe-3.8.1.src.tar.xz/sha512 b/deps/checksums/cfe-3.8.1.src.tar.xz/sha512
new file mode 100644
index 00000000000000..9c90c669cb03fc
--- /dev/null
+++ b/deps/checksums/cfe-3.8.1.src.tar.xz/sha512
@@ -0,0 +1 @@
+72d23a410271b50f97371b13dd7a6c6c5c0a993e35df436ab716ece8521d83406aa3d4bf8fdecd8154139f39fd5e011e480d405225d8c3ff152d0a2ac4573e04
diff --git a/deps/checksums/cfe-3.9.0.src.tar.xz/md5 b/deps/checksums/cfe-3.9.0.src.tar.xz/md5
new file mode 100644
index 00000000000000..425260abd85e46
--- /dev/null
+++ b/deps/checksums/cfe-3.9.0.src.tar.xz/md5
@@ -0,0 +1 @@
+29e1d86bee422ab5345f5e9fb808d2dc
diff --git a/deps/checksums/cfe-3.9.0.src.tar.xz/sha512 b/deps/checksums/cfe-3.9.0.src.tar.xz/sha512
new file mode 100644
index 00000000000000..1e143511ea733f
--- /dev/null
+++ b/deps/checksums/cfe-3.9.0.src.tar.xz/sha512
@@ -0,0 +1 @@
+f405b5819fd19276b2de4da80a51171a3b1c5c00df810e1f284184c693e410775fe2933576f942b881664dd3b75e78f0f15b7e5a3eca7819ffbcfe528d9a578e
diff --git a/deps/checksums/cfe-3.9.1.src.tar.xz/md5 b/deps/checksums/cfe-3.9.1.src.tar.xz/md5
deleted file mode 100644
index 5c7c9f1a00ce65..00000000000000
--- a/deps/checksums/cfe-3.9.1.src.tar.xz/md5
+++ /dev/null
@@ -1 +0,0 @@
-45713ec5c417ed9cad614cd283d786a1
diff --git a/deps/checksums/cfe-3.9.1.src.tar.xz/sha512 b/deps/checksums/cfe-3.9.1.src.tar.xz/sha512
deleted file mode 100644
index ed5418b996f396..00000000000000
--- a/deps/checksums/cfe-3.9.1.src.tar.xz/sha512
+++ /dev/null
@@ -1 +0,0 @@
-3f0eea194597e438bbe49ce9ef5fdced81459c21cbdd2653750b2fe02c55a0154d6a33a8cfd02e607b83314a8e35b2c300f944462120ab6de1d4139d85db56b8
diff --git a/deps/checksums/compiler-rt-3.3.src.tar.gz/md5 b/deps/checksums/compiler-rt-3.3.src.tar.gz/md5
new file mode 100644
index 00000000000000..b9bb75a6c72c10
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.3.src.tar.gz/md5
@@ -0,0 +1 @@
+9c129ce24514467cfe492cf2fed8e2c4
diff --git a/deps/checksums/compiler-rt-3.3.src.tar.gz/sha512 b/deps/checksums/compiler-rt-3.3.src.tar.gz/sha512
new file mode 100644
index 00000000000000..cae2adf9a6aa6a
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.3.src.tar.gz/sha512
@@ -0,0 +1 @@
+3e86aa8ab9810b4fbac54a40fc93a717a55c642520858c0db215a5324c1e495b4d8fcec9620251cca8e4e5f9afa34bc14364d7f785880a0700469d0201827929
diff --git a/deps/checksums/compiler-rt-3.7.0.src.tar.xz/md5 b/deps/checksums/compiler-rt-3.7.0.src.tar.xz/md5
new file mode 100644
index 00000000000000..72f9deb233c600
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.7.0.src.tar.xz/md5
@@ -0,0 +1 @@
+383c10affd513026f08936b5525523f5
diff --git a/deps/checksums/compiler-rt-3.7.0.src.tar.xz/sha512 b/deps/checksums/compiler-rt-3.7.0.src.tar.xz/sha512
new file mode 100644
index 00000000000000..bc0b953409998e
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.7.0.src.tar.xz/sha512
@@ -0,0 +1 @@
+2ba6abb3d6ec7f1469cfe1d48fde2069e9a767d19144f80f05516ac63f353ace90a9df3e9d1c1f708f3c397aba0ec61b12e4f105b25a2e1cd26b25b0dd252bc9
diff --git a/deps/checksums/compiler-rt-3.7.1.src.tar.xz/md5 b/deps/checksums/compiler-rt-3.7.1.src.tar.xz/md5
new file mode 100644
index 00000000000000..db72b60b85cf96
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.7.1.src.tar.xz/md5
@@ -0,0 +1 @@
+1c6975daf30bb3b0473b53c3a1a6ff01
diff --git a/deps/checksums/compiler-rt-3.7.1.src.tar.xz/sha512 b/deps/checksums/compiler-rt-3.7.1.src.tar.xz/sha512
new file mode 100644
index 00000000000000..4fbca97b42879d
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.7.1.src.tar.xz/sha512
@@ -0,0 +1 @@
+bf434519ea0838264c30de1e1e8681320aa868df0ecc825a45c659077b963a4120c18216946558cbf8aea24a8ac8ec39af2066dab906bc7cabc0894d51d61325
diff --git a/deps/checksums/compiler-rt-3.8.1.src.tar.xz/md5 b/deps/checksums/compiler-rt-3.8.1.src.tar.xz/md5
new file mode 100644
index 00000000000000..f46b850e333776
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.8.1.src.tar.xz/md5
@@ -0,0 +1 @@
+f140db073d2453f854fbe01cc46f3110
diff --git a/deps/checksums/compiler-rt-3.8.1.src.tar.xz/sha512 b/deps/checksums/compiler-rt-3.8.1.src.tar.xz/sha512
new file mode 100644
index 00000000000000..8f8875c9ec13b0
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.8.1.src.tar.xz/sha512
@@ -0,0 +1 @@
+bed3da5f8594c4bf71af406419fbeaf7ed5d8bf46adb305233a298271d34a9af1072bcb47d474ac19bb862cc7c7bc9e1d89bc1567133553f29480030cad1cf75
diff --git a/deps/checksums/compiler-rt-3.9.0.src.tar.xz/md5 b/deps/checksums/compiler-rt-3.9.0.src.tar.xz/md5
new file mode 100644
index 00000000000000..b1c1059f6c4bff
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.9.0.src.tar.xz/md5
@@ -0,0 +1 @@
+b7ea34c9d744da16ffc0217b6990d095
diff --git a/deps/checksums/compiler-rt-3.9.0.src.tar.xz/sha512 b/deps/checksums/compiler-rt-3.9.0.src.tar.xz/sha512
new file mode 100644
index 00000000000000..40f891907bcbe6
--- /dev/null
+++ b/deps/checksums/compiler-rt-3.9.0.src.tar.xz/sha512
@@ -0,0 +1 @@
+8d15c0315d7a89d9336e0ae4b72775d0815a8e7d962056645e1d0c6a23759bb2d8133c9ad2164e181f017641e8a184a062fbc876a371b81d5b1c2626405f6616
diff --git a/deps/checksums/compiler-rt-3.9.1.src.tar.xz/md5 b/deps/checksums/compiler-rt-3.9.1.src.tar.xz/md5
deleted file mode 100644
index 78d93ad142f734..00000000000000
--- a/deps/checksums/compiler-rt-3.9.1.src.tar.xz/md5
+++ /dev/null
@@ -1 +0,0 @@
-aadc76e7e180fafb10fb729444e287a3
diff --git a/deps/checksums/compiler-rt-3.9.1.src.tar.xz/sha512 b/deps/checksums/compiler-rt-3.9.1.src.tar.xz/sha512
deleted file mode 100644
index 00418134694005..00000000000000
--- a/deps/checksums/compiler-rt-3.9.1.src.tar.xz/sha512
+++ /dev/null
@@ -1 +0,0 @@
-91a4c78a5e8c1cdd2d6bbcb27d2c34f49ea30a952733444ef4f4a7cc7503c880d4b6924595e87745ef6278851178f49f98d38d2068975d4fb6577fb9e9cdcdbe
diff --git a/deps/checksums/libcxx-3.3.src.tar.gz/md5 b/deps/checksums/libcxx-3.3.src.tar.gz/md5
new file mode 100644
index 00000000000000..9ca149c139ac2c
--- /dev/null
+++ b/deps/checksums/libcxx-3.3.src.tar.gz/md5
@@ -0,0 +1 @@
+59006e659ffb33f5222a7b79d4cd071e
diff --git a/deps/checksums/libcxx-3.3.src.tar.gz/sha512 b/deps/checksums/libcxx-3.3.src.tar.gz/sha512
new file mode 100644
index 00000000000000..bef636a9820770
--- /dev/null
+++ b/deps/checksums/libcxx-3.3.src.tar.gz/sha512
@@ -0,0 +1 @@
+806ee0321ceac4d0bdcdad581208e8589d13f688124dfa75f484242fe299b8d423f6bd0172d674a01daf57b4f1e1a9751f5f331e734639917aa24f427b2f5e2c
diff --git a/deps/checksums/libcxx-3.9.1.src.tar.xz/md5 b/deps/checksums/libcxx-3.9.1.src.tar.xz/md5
deleted file mode 100644
index 1989ba630525e9..00000000000000
--- a/deps/checksums/libcxx-3.9.1.src.tar.xz/md5
+++ /dev/null
@@ -1 +0,0 @@
-75a3214224301fc543fa6a38bdf7efe0
diff --git a/deps/checksums/libcxx-3.9.1.src.tar.xz/sha512 b/deps/checksums/libcxx-3.9.1.src.tar.xz/sha512
deleted file mode 100644
index d6cd276c6f1941..00000000000000
--- a/deps/checksums/libcxx-3.9.1.src.tar.xz/sha512
+++ /dev/null
@@ -1 +0,0 @@
-a5976e4096624a7307b3e43f4a22ac2dc74572226e0f57af9f3ef537a14c3cff1601b7042aef9dc40a0ee53ca76b08d72eb9c253dcf34f115d3153c302db7070
diff --git a/deps/checksums/lldb-3.3.src.tar.gz/md5 b/deps/checksums/lldb-3.3.src.tar.gz/md5
new file mode 100644
index 00000000000000..9f56d299ac0f8c
--- /dev/null
+++ b/deps/checksums/lldb-3.3.src.tar.gz/md5
@@ -0,0 +1 @@
+c583c80c25e56a41e3e5ae7c2f442929
diff --git a/deps/checksums/lldb-3.3.src.tar.gz/sha512 b/deps/checksums/lldb-3.3.src.tar.gz/sha512
new file mode 100644
index 00000000000000..1b69a9828a097c
--- /dev/null
+++ b/deps/checksums/lldb-3.3.src.tar.gz/sha512
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