gnu: Add rocm-comgr.

* gnu/packages/rocm.scm (rocm-comgr): New variable.
* gnu/packages/patches/rocm-comgr-3.1.0-dependencies.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu/local.mk

@@ -1701,6 +1701,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/rnp-add-version.cmake.patch		\
   %D%/packages/patches/rnp-disable-ruby-rnp-tests.patch		\
   %D%/packages/patches/rnp-unbundle-googletest.patch		\
+  %D%/packages/patches/rocm-comgr-3.1.0-dependencies.patch \
   %D%/packages/patches/ruby-sanitize-system-libxml.patch	\
   %D%/packages/patches/rust-1.19-mrustc.patch			\
   %D%/packages/patches/rust-1.25-accept-more-detailed-gdb-lines.patch \

gnu/packages/patches/rocm-comgr-3.1.0-dependencies.patch

@@ -0,0 +1,52 @@
+https://github.com/RadeonOpenCompute/ROCm-CompilerSupport/pull/25
+
+From c65cba2e73f9118e128b9ab7e655ee0f8a7798e7 Mon Sep 17 00:00:00 2001
+From: Craig Andrews <candrews@integralblue.com>
+Date: Sun, 1 Mar 2020 19:24:22 -0500
+Subject: [PATCH] Link additional required LLVM libraries
+
+Without these additional required dependencies, linking fails with errors such as:
+`undefined reference to llvm::errs()'`
+---
+ CMakeLists.txt | 20 ++++++++++++++++++--
+ 1 file changed, 18 insertions(+), 2 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 1794a07..c7b852a 100644
+--- a/lib/comgr/CMakeLists.txt
++++ b/lib/comgr/CMakeLists.txt
+@@ -207,7 +207,11 @@ install(FILES
+   DESTINATION "${AMD_COMGR_PACKAGE_PREFIX}")
+ 
+ set(CLANG_LIBS
+-  clangFrontendTool)
++  clangFrontendTool
++  clangFrontend
++  clangBasic
++  clangDriver
++  clangSerialization)
+ 
+ set(LLD_LIBS
+   lldELF
+@@ -218,8 +222,20 @@ if (LLVM_LINK_LLVM_DYLIB)
+ else()
+   llvm_map_components_to_libnames(LLVM_LIBS
+     ${LLVM_TARGETS_TO_BUILD}
++    Option
+     DebugInfoDWARF
+-    Symbolize)
++    Symbolize
++    Support
++    Object
++    BitWriter
++    MC
++    MCParser
++    MCDisassembler
++    Core
++    IRReader
++    CodeGen
++    Linker
++    BinaryFormat)
+ endif()
+ 
+ target_link_libraries(amd_comgr

gnu/packages/rocm.scm

@@ -115,3 +115,35 @@ tasks needed for the ROCM software stack.")
     (description "AMD-specific device-side language runtime libraries, namely
 oclc, ocml, ockl, opencl, hip and hc.")
     (license license:ncsa)))
+
+(define-public rocm-comgr
+  (package
+    (name "rocm-comgr")
+    (version %rocm-version)
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/RadeonOpenCompute/ROCm-CompilerSupport.git")
+                    (commit (string-append "rocm-" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0bakbm7shr0l67lph44b5cnc9psd6rivg1mp79qizaawkn380x60"))
+              (patches
+               (search-patches "rocm-comgr-3.1.0-dependencies.patch"))))
+    (build-system cmake-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'chdir
+           (lambda _
+             (chdir "lib/comgr"))))))
+    (inputs
+     `(("rocm-device-libs" ,rocm-device-libs)
+       ("llvm" ,llvm-for-rocm)
+       ("lld" ,lld)))
+    (home-page "https://github.com/RadeonOpenCompute/ROCm-CompilerSupport")
+    (synopsis "ROCm Code Object Manager")
+    (description "The Comgr library provides APIs for compiling and inspecting
+AMDGPU code objects.")
+    (license license:ncsa)))