[flang] Fix standalone builds against installed MLIR (llvm#126387)

mgorny · sivan-shani · commit 2bbbba323b7f · 2025-02-21T15:42:19.000Z
1. Add a new `MLIR_DEPS` argument group to `flang_add_library()`, and
move MLIR-specific dependencies to that group. These dependencies are
added as usual in regular builds, and are skipped in standalone builds,
since MLIR targets are not visible there (and were already built and
installed).
2. Fix the value of `MLIR_MAIN_SRC_DIR` to refer to the current source
directory rather than the directory written into MLIR CMake files. The
latter refers to the directory used to build the MLIR package, and is no
longer valid.
3. Fix non-dylib friendly linking of `LLVMTargetParser` in `Optimizer`
unittests.

With these changes, I can successfully run Flang's regression tests.
diff --git a/flang/CMakeLists.txt b/flang/CMakeLists.txt
@@ -230,6 +230,11 @@ if (FLANG_STANDALONE_BUILD)
     add_custom_target(doxygen ALL)
   endif()
 
+  # Override the value from installed CMake files, as they refer
+  # to the directory used during the original MLIR package build,
+  # which may be no longer available.  Instead, use the current checkout.
+  set(MLIR_MAIN_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../mlir )
+
 else()
   option(FLANG_INCLUDE_TESTS
          "Generate build targets for the Flang unit tests."
diff --git a/flang/cmake/modules/AddFlang.cmake b/flang/cmake/modules/AddFlang.cmake
@@ -18,7 +18,7 @@ endmacro()
 
 function(add_flang_library name)
   set(options SHARED STATIC INSTALL_WITH_TOOLCHAIN)
-  set(multiValueArgs ADDITIONAL_HEADERS CLANG_LIBS MLIR_LIBS)
+  set(multiValueArgs ADDITIONAL_HEADERS CLANG_LIBS MLIR_LIBS MLIR_DEPS)
   cmake_parse_arguments(ARG
     "${options}"
     ""
@@ -69,6 +69,9 @@ function(add_flang_library name)
   if (ARG_MLIR_LIBS)
     mlir_target_link_libraries(${name} PRIVATE ${ARG_MLIR_LIBS})
   endif()
+  if (ARG_MLIR_DEPS AND NOT FLANG_STANDALONE_BUILD)
+    add_dependencies(${name} ${ARG_MLIR_DEPS})
+  endif()
 
   if (TARGET ${name})
 
diff --git a/flang/lib/Frontend/CMakeLists.txt b/flang/lib/Frontend/CMakeLists.txt
@@ -18,9 +18,6 @@ add_flang_library(flangFrontend
   FIROptCodeGenPassIncGen
   FIROptTransformsPassIncGen
   HLFIRDialect
-  MLIRIR
-  ${dialect_libs}
-  ${extension_libs}
 
   LINK_LIBS
   CUFDialect
@@ -56,6 +53,11 @@ add_flang_library(flangFrontend
   FrontendOpenACC
   FrontendOpenMP
 
+  MLIR_DEPS
+  MLIRIR
+  ${dialect_libs}
+  ${extension_libs}
+
   MLIR_LIBS
   MLIRTransforms
   MLIRBuiltinToLLVMIRTranslation
diff --git a/flang/lib/Lower/CMakeLists.txt b/flang/lib/Lower/CMakeLists.txt
@@ -44,8 +44,6 @@ add_flang_library(FortranLower
   FIRDialect
   FIRTransforms
   HLFIRDialect
-  ${dialect_libs}
-  ${extension_libs}
 
   LINK_LIBS
   CUFAttrs
@@ -64,6 +62,10 @@ add_flang_library(FortranLower
   LINK_COMPONENTS
   Support
 
+  MLIR_DEPS
+  ${dialect_libs}
+  ${extension_libs}
+
   MLIR_LIBS
   ${dialect_libs}
   ${extension_libs}
diff --git a/flang/lib/Optimizer/Analysis/CMakeLists.txt b/flang/lib/Optimizer/Analysis/CMakeLists.txt
@@ -6,15 +6,17 @@ add_flang_library(FIRAnalysis
   FIRDialect
   FIRSupport
   HLFIRDialect
-  MLIRIR
-  MLIROpenMPDialect
 
   LINK_LIBS
   FIRBuilder
   FIRDialect
   FIRSupport
   HLFIRDialect
 
+  MLIR_DEPS
+  MLIRIR
+  MLIROpenMPDialect
+
   MLIR_LIBS
   MLIRFuncDialect
   MLIRLLVMDialect
diff --git a/flang/lib/Optimizer/Builder/CMakeLists.txt b/flang/lib/Optimizer/Builder/CMakeLists.txt
@@ -40,8 +40,6 @@ add_flang_library(FIRBuilder
   CUFDialect
   FIRDialect
   HLFIRDialect
-  ${dialect_libs}
-  ${extension_libs}
 
   LINK_LIBS
   CUFAttrs
@@ -52,6 +50,10 @@ add_flang_library(FIRBuilder
   FortranEvaluate
   HLFIRDialect
 
+  MLIR_DEPS
+  ${dialect_libs}
+  ${extension_libs}
+
   MLIR_LIBS
   ${dialect_libs}
   ${extension_libs}
diff --git a/flang/lib/Optimizer/Dialect/CMakeLists.txt b/flang/lib/Optimizer/Dialect/CMakeLists.txt
@@ -12,7 +12,6 @@ add_flang_library(FIRDialect
 
   DEPENDS
   CanonicalizationPatternsIncGen
-  MLIRIR
   FIROpsIncGen
   CUFAttrsIncGen
   intrinsics_gen
@@ -26,6 +25,9 @@ add_flang_library(FIRDialect
   AsmPrinter
   Remarks
 
+  MLIR_DEPS
+  MLIRIR
+
   MLIR_LIBS
   MLIRArithDialect
   MLIRBuiltinToLLVMIRTranslation
diff --git a/flang/lib/Optimizer/Dialect/CUF/Attributes/CMakeLists.txt b/flang/lib/Optimizer/Dialect/CUF/Attributes/CMakeLists.txt
@@ -3,7 +3,6 @@ add_flang_library(CUFAttrs
   CUFAttr.cpp
 
   DEPENDS
-  MLIRIR
   CUFAttrsIncGen
   CUFOpsIncGen
 
@@ -12,6 +11,9 @@ add_flang_library(CUFAttrs
   AsmPrinter
   Remarks
 
+  MLIR_DEPS
+  MLIRIR
+
   MLIR_LIBS
   MLIRTargetLLVMIRExport
 )
diff --git a/flang/lib/Optimizer/Dialect/CUF/CMakeLists.txt b/flang/lib/Optimizer/Dialect/CUF/CMakeLists.txt
@@ -6,7 +6,6 @@ add_flang_library(CUFDialect
   CUFToLLVMIRTranslation.cpp
 
   DEPENDS
-  MLIRIR
   CUFAttrsIncGen
   CUFOpsIncGen
 
@@ -20,6 +19,9 @@ add_flang_library(CUFDialect
   AsmPrinter
   Remarks
 
+  MLIR_DEPS
+  MLIRIR
+
   MLIR_LIBS
   MLIRIR
   MLIRGPUDialect
diff --git a/flang/lib/Optimizer/Dialect/Support/CMakeLists.txt b/flang/lib/Optimizer/Dialect/Support/CMakeLists.txt
@@ -5,9 +5,11 @@ add_flang_library(FIRDialectSupport
   FIRContext.cpp
 
   DEPENDS
-  MLIRIR
   intrinsics_gen
 
+  MLIR_DEPS
+  MLIRIR
+
   MLIR_LIBS
   ${dialect_libs}
 )
diff --git a/flang/lib/Optimizer/HLFIR/IR/CMakeLists.txt b/flang/lib/Optimizer/HLFIR/IR/CMakeLists.txt
@@ -8,7 +8,6 @@ add_flang_library(HLFIRDialect
   CUFAttrsIncGen
   FIRDialect
   HLFIROpsIncGen
-  ${dialect_libs}
 
   LINK_LIBS
   CUFAttrs
@@ -19,6 +18,9 @@ add_flang_library(HLFIRDialect
   AsmPrinter
   Remarks
 
+  MLIR_DEPS
+  ${dialect_libs}
+
   MLIR_LIBS
   MLIRIR
   ${dialect_libs}
diff --git a/flang/lib/Optimizer/HLFIR/Transforms/CMakeLists.txt b/flang/lib/Optimizer/HLFIR/Transforms/CMakeLists.txt
@@ -15,7 +15,6 @@ add_flang_library(HLFIRTransforms
   CUFAttrsIncGen
   FIRDialect
   HLFIROpsIncGen
-  ${dialect_libs}
 
   LINK_LIBS
   CUFAttrs
@@ -33,6 +32,9 @@ add_flang_library(HLFIRTransforms
   AsmPrinter
   Remarks
 
+  MLIR_DEPS
+  ${dialect_libs}
+
   MLIR_LIBS
   MLIRIR
   ${dialect_libs}
diff --git a/flang/lib/Optimizer/OpenACC/CMakeLists.txt b/flang/lib/Optimizer/OpenACC/CMakeLists.txt
@@ -11,7 +11,6 @@ add_flang_library(FIROpenACCSupport
   FIRDialectSupport
   FIRSupport
   HLFIRDialect
-  MLIROpenACCDialect
 
   LINK_LIBS
   FIRBuilder
@@ -21,6 +20,9 @@ add_flang_library(FIROpenACCSupport
   FIRSupport
   HLFIRDialect
 
+  MLIR_DEPS
+  MLIROpenACCDialect
+
   MLIR_LIBS
   MLIROpenACCDialect
 )
diff --git a/flang/lib/Optimizer/OpenMP/CMakeLists.txt b/flang/lib/Optimizer/OpenMP/CMakeLists.txt
@@ -12,7 +12,6 @@ add_flang_library(FlangOpenMPTransforms
   FIRDialect
   HLFIROpsIncGen
   FlangOpenMPPassesIncGen
-  ${dialect_libs}
 
   LINK_LIBS
   FIRAnalysis
@@ -24,6 +23,9 @@ add_flang_library(FlangOpenMPTransforms
   FortranSupport
   HLFIRDialect
 
+  MLIR_DEPS
+  ${dialect_libs}
+
   MLIR_LIBS
   MLIRFuncDialect
   MLIROpenMPDialect
diff --git a/flang/lib/Optimizer/Support/CMakeLists.txt b/flang/lib/Optimizer/Support/CMakeLists.txt
@@ -10,16 +10,18 @@ add_flang_library(FIRSupport
   DEPENDS
   FIROpsIncGen
   HLFIROpsIncGen
-  MLIRIR
-  ${dialect_libs}
-  ${extension_libs}
 
   LINK_LIBS
   FIRDialect
 
   LINK_COMPONENTS
   TargetParser
 
+  MLIR_DEPS
+  MLIRIR
+  ${dialect_libs}
+  ${extension_libs}
+
   MLIR_LIBS
   ${dialect_libs}
   ${extension_libs}
diff --git a/flang/test/CMakeLists.txt b/flang/test/CMakeLists.txt
@@ -59,26 +59,30 @@ set(FLANG_TEST_PARAMS
 
 set(FLANG_TEST_DEPENDS
   flang
-  llvm-config
-  FileCheck
-  count
-  not
   module_files
   fir-opt
   tco
   bbc
-  llvm-dis
-  llvm-objdump
-  llvm-readobj
-  split-file
   FortranDecimal
 )
+if (NOT FLANG_STANDALONE_BUILD)
+  list(APPEND FLANG_TEST_DEPENDS
+    llvm-config
+    FileCheck
+    count
+    not
+    llvm-dis
+    llvm-objdump
+    llvm-readobj
+    split-file
+  )
+endif ()
 
 if (FLANG_INCLUDE_RUNTIME)
   list(APPEND FLANG_TEST_DEPENDS flang_rt.runtime)
 endif ()
 
-if (LLVM_ENABLE_PLUGINS AND NOT WIN32)
+if (LLVM_ENABLE_PLUGINS AND NOT WIN32 AND NOT FLANG_STANDALONE_BUILD)
   list(APPEND FLANG_TEST_DEPENDS Bye)
 endif()
 
diff --git a/flang/test/lib/Analysis/AliasAnalysis/CMakeLists.txt b/flang/test/lib/Analysis/AliasAnalysis/CMakeLists.txt
@@ -8,7 +8,6 @@ add_flang_library(FIRTestAnalysis
   FIRSupport
   FIRTransforms
   FIRAnalysis
-  ${dialect_libs}
 
   LINK_LIBS
   FIRDialect
@@ -18,6 +17,9 @@ add_flang_library(FIRTestAnalysis
   FIRAnalysis
   MLIRTestAnalysis
 
+  MLIR_DEPS
+  ${dialect_libs}
+
   MLIR_LIBS
   ${dialect_libs}
   MLIRFuncDialect
diff --git a/flang/test/lib/OpenACC/CMakeLists.txt b/flang/test/lib/OpenACC/CMakeLists.txt
@@ -5,16 +5,18 @@ add_flang_library(FIRTestOpenACCInterfaces
   FIRDialect
   FIROpenACCSupport
   FIRSupport
-  MLIRIR
-  MLIROpenACCDialect
-  MLIRPass
-  MLIRSupport
 
   LINK_LIBS
   FIRDialect
   FIROpenACCSupport
   FIRSupport
 
+  MLIR_DEPS
+  MLIRIR
+  MLIROpenACCDialect
+  MLIRPass
+  MLIRSupport
+
   MLIR_LIBS
   MLIRIR
   MLIROpenACCDialect
diff --git a/flang/unittests/Optimizer/CMakeLists.txt b/flang/unittests/Optimizer/CMakeLists.txt
@@ -1,6 +1,10 @@
 get_property(dialect_libs GLOBAL PROPERTY MLIR_DIALECT_LIBS)
 get_property(extension_libs GLOBAL PROPERTY MLIR_EXTENSION_LIBS)
 
+set(LLVM_LINK_COMPONENTS
+  TargetParser
+)
+
 set(LIBS
   CUFDialect
   FIRBuilder
@@ -9,7 +13,6 @@ set(LIBS
   FIRDialectSupport
   FIRSupport
   HLFIRDialect
-  LLVMTargetParser
 )
 
 add_flang_unittest(FlangOptimizerTests
@@ -39,8 +42,12 @@ DEPENDS
   CUFDialect
   FIRDialect
   FIRSupport
-  HLFIRDialect
-  ${dialect_libs})
+  HLFIRDialect)
+
+if(NOT FLANG_STANDALONE_BUILD)
+  add_dependencies(FlangOptimizerTests
+    ${dialect_libs})
+endif()
 
 target_link_libraries(FlangOptimizerTests
   PRIVATE
