LFortran: Add support for mixed-language linking with Fortran

Parse implicit link information for this compiler to support
mixed-language linking.  This was missed by commit 98d0f918ba (LFortran:
Add support for this compiler, 2024-01-25). Also activate mixed-language
test cases that would have caught this.

Fixes: #26145

Modules/CMakeParseImplicitLinkInfo.cmake

@@ -49,15 +49,22 @@ function(cmake_parse_implicit_link_info2 text log_var obj_regex)
   set(multiValueArgs )
   cmake_parse_arguments(EXTRA_PARSE "${keywordArgs}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
 
+  set(is_lfortran 0)
   set(is_msvc 0)
   if(EXTRA_PARSE_LANGUAGE)
     if("x${CMAKE_${EXTRA_PARSE_LANGUAGE}_COMPILER_ID}" STREQUAL "xMSVC" OR
         "x${CMAKE_${EXTRA_PARSE_LANGUAGE}_SIMULATE_ID}" STREQUAL "xMSVC")
       set(is_msvc 1)
+    elseif("x${CMAKE_${EXTRA_PARSE_LANGUAGE}_COMPILER_ID}" STREQUAL "xLFortran")
+      set(is_lfortran 1)
     endif()
   endif()
   # Parse implicit linker arguments.
   set(linker "ld[0-9]*(\\.[a-z]+)?")
+  if(is_lfortran)
+    # FIXME(lfortran): No way to pass -v to clang/gcc driver.
+    string(APPEND linker "|clang|gcc")
+  endif()
   if(is_msvc)
     string(APPEND linker "|link\\.exe|lld-link(\\.exe)?")
   endif()
@@ -78,6 +85,10 @@ function(cmake_parse_implicit_link_info2 text log_var obj_regex)
   set(linker_exclude_regex "collect2 version |^[A-Za-z0-9_]+=|/ldfe ")
   set(linker_tool_regex "^[ \t]*(->|\")?[ \t]*(([^\"]*[/\\])?(${linker}))(\"|,| |$)")
   set(linker_tool_exclude_regex "cuda-fake-ld|-fuse-ld=|^ExecuteExternalTool ")
+  if(is_lfortran)
+    # FIXME(lfortran): No way to pass -v to clang/gcc driver.
+    string(APPEND linker_tool_exclude_regex "|^clang |^gcc ")
+  endif()
   set(linker_tool "NOTFOUND")
   set(linker_tool_fallback "")
   set(link_line_parsed 0)

Tests/Fortran/CMakeLists.txt

@@ -38,7 +38,7 @@ if(WIN32 AND NOT CYGWIN)
 endif()
 
 if(CMAKE_Fortran_COMPILER_ID STREQUAL "LFortran")
-  add_compile_options(--implicit-interface)
+  add_compile_options("$<$<COMPILE_LANGUAGE:Fortran>:--implicit-interface>")
 endif()
 
 add_library(hello STATIC hello.f)
@@ -53,7 +53,7 @@ function(test_fortran_c_interface_module)
   FortranCInterface_VERIFY()
   FortranCInterface_VERIFY(CXX)
   if(CMAKE_Fortran_COMPILER_SUPPORTS_F90)
-    if(NOT CMAKE_Fortran_COMPILER_ID MATCHES "SunPro|PathScale|Absoft|Fujitsu|LCC")
+    if(NOT CMAKE_Fortran_COMPILER_ID MATCHES "SunPro|PathScale|Absoft|Fujitsu|LCC|LFortran")
       set(module_expected 1)
     endif()
     if(FortranCInterface_MODULE_FOUND OR module_expected)
@@ -127,7 +127,7 @@ endfunction()
 # if the id's match or the compilers are compatible, then
 # call the test_fortran_c_interface_module function
 if("${CMAKE_Fortran_COMPILER_ID}:${CMAKE_C_COMPILER_ID}" MATCHES
-    "(Intel(LLVM)?:MSVC|Absoft:GNU|LLVMFlang:(GNU|Clang))"
+    "(Intel(LLVM)?:MSVC|Absoft:GNU|(LLVMFlang|LFortran):(GNU|Clang))"
     OR ("${CMAKE_Fortran_COMPILER_ID}" STREQUAL "${CMAKE_C_COMPILER_ID}" ))
   test_fortran_c_interface_module()
 else()

Tests/FortranC/CMakeLists.txt

@@ -3,7 +3,7 @@ project(FortranC C Fortran)
 
 # Skip this test for compilers not known to be compatible.
 if(NOT (CMAKE_C_COMPILER_ID STREQUAL CMAKE_Fortran_COMPILER_ID OR
-        "${CMAKE_C_COMPILER_ID}-${CMAKE_Fortran_COMPILER_ID}" MATCHES "^(MSVC-Intel|(GNU|Clang)-LLVMFlang)$"))
+        "${CMAKE_C_COMPILER_ID}-${CMAKE_Fortran_COMPILER_ID}" MATCHES "^(MSVC-Intel|(GNU|Clang)-(LLVMFlang|LFortran))$"))
   message(STATUS "${CMAKE_C_COMPILER_ID} C and ${CMAKE_Fortran_COMPILER_ID} Fortran not known to be compatible!")
   return()
 endif()

Tests/RunCMake/ParseImplicitData/linux-Fortran-LFortran-0.35.0-clang.input

@@ -0,0 +1,25 @@
+CMAKE_LANG=Fortran
+CMAKE_LINKER=/usr/bin/ld
+CMAKE_Fortran_COMPILER_ABI=ELF
+CMAKE_Fortran_COMPILER_AR=
+CMAKE_Fortran_COMPILER_ARCHITECTURE_ID=
+CMAKE_Fortran_COMPILER_EXTERNAL_TOOLCHAIN=
+CMAKE_Fortran_COMPILER_ID=LFortran
+CMAKE_Fortran_COMPILER_LAUNCHER=
+CMAKE_Fortran_COMPILER_LOADED=1
+CMAKE_Fortran_COMPILER_RANLIB=
+CMAKE_Fortran_COMPILER_TARGET=
+CMAKE_Fortran_COMPILER_VERSION=0.35.0
+CMAKE_Fortran_COMPILER_VERSION_INTERAL=
+Change Dir: '/tmp/ii/CMakeFiles/CMakeTmp'
+
+Run Build Command(s): /tmp/CMake/bin/cmake -E env VERBOSE=1 /usr/bin/gmake -f Makefile cmTC_48bf9/fast
+/usr/bin/gmake  -f CMakeFiles/cmTC_48bf9.dir/build.make CMakeFiles/cmTC_48bf9.dir/build
+gmake[1]: Entering directory '/tmp/ii/CMakeFiles/CMakeTmp'
+Building Fortran object CMakeFiles/cmTC_48bf9.dir/CMakeFortranCompilerABI.F.o
+/usr/bin/lfortran --cpp-infer   -v --generate-object-code -c /tmp/CMake/Modules/CMakeFortranCompilerABI.F -o CMakeFiles/cmTC_48bf9.dir/CMakeFortranCompilerABI.F.o
+Linking Fortran executable cmTC_48bf9
+/tmp/CMake/bin/cmake -E cmake_link_script CMakeFiles/cmTC_48bf9.dir/link.txt --verbose=1
+/usr/bin/lfortran  -v -Wl,-export-dynamic CMakeFiles/cmTC_48bf9.dir/CMakeFortranCompilerABI.F.o -o cmTC_48bf9
+clang -o cmTC_48bf9 CMakeFiles/cmTC_48bf9.dir/CMakeFortranCompilerABI.F.o  -L"/usr/bin/../lib64" -Wl,-rpath,"/usr/bin/../lib64" -Wl,-export-dynamic -llfortran_runtime -lm
+gmake[1]: Leaving directory '/tmp/ii/CMakeFiles/CMakeTmp'

Tests/RunCMake/ParseImplicitData/linux-Fortran-LFortran-0.35.0-gcc.input

@@ -0,0 +1,25 @@
+CMAKE_LANG=Fortran
+CMAKE_LINKER=/usr/bin/ld
+CMAKE_Fortran_COMPILER_ABI=ELF
+CMAKE_Fortran_COMPILER_AR=
+CMAKE_Fortran_COMPILER_ARCHITECTURE_ID=
+CMAKE_Fortran_COMPILER_EXTERNAL_TOOLCHAIN=
+CMAKE_Fortran_COMPILER_ID=LFortran
+CMAKE_Fortran_COMPILER_LAUNCHER=
+CMAKE_Fortran_COMPILER_LOADED=1
+CMAKE_Fortran_COMPILER_RANLIB=
+CMAKE_Fortran_COMPILER_TARGET=
+CMAKE_Fortran_COMPILER_VERSION=0.35.0
+CMAKE_Fortran_COMPILER_VERSION_INTERAL=
+Change Dir: '/tmp/ii/CMakeFiles/CMakeTmp'
+
+Run Build Command(s): /tmp/CMake/bin/cmake -E env VERBOSE=1 /usr/bin/gmake -f Makefile cmTC_48bf9/fast
+/usr/bin/gmake  -f CMakeFiles/cmTC_48bf9.dir/build.make CMakeFiles/cmTC_48bf9.dir/build
+gmake[1]: Entering directory '/tmp/ii/CMakeFiles/CMakeTmp'
+Building Fortran object CMakeFiles/cmTC_48bf9.dir/CMakeFortranCompilerABI.F.o
+/usr/bin/lfortran --cpp-infer   --link-with-gcc    -v --generate-object-code -c /tmp/CMake/Modules/CMakeFortranCompilerABI.F -o CMakeFiles/cmTC_48bf9.dir/CMakeFortranCompilerABI.F.o
+Linking Fortran executable cmTC_48bf9
+/tmp/CMake/bin/cmake -E cmake_link_script CMakeFiles/cmTC_48bf9.dir/link.txt --verbose=1
+/usr/bin/lfortran  -v -Wl,-export-dynamic --link-with-gcc  CMakeFiles/cmTC_48bf9.dir/CMakeFortranCompilerABI.F.o -o cmTC_48bf9
+gcc -o cmTC_48bf9 CMakeFiles/cmTC_48bf9.dir/CMakeFortranCompilerABI.F.o  -L"/usr/bin/../lib64" -Wl,-rpath,"/usr/bin/../lib64" -Wl,-export-dynamic -llfortran_runtime -lm
+gmake[1]: Leaving directory '/tmp/ii/CMakeFiles/CMakeTmp'

Tests/RunCMake/ParseImplicitLinkInfo/ParseImplicitLinkInfo.cmake

@@ -41,6 +41,8 @@ set(targets
   linux-CUDA-NVIDIA-10.1.168-CLANG linux-CUDA-NVIDIA-10.1.168-XLClang-v
     linux-CUDA-NVIDIA-9.2.148-GCC
   linux-Fortran-LLVMFlang-15.0.0
+  linux-Fortran-LFortran-0.35.0-clang
+  linux-Fortran-LFortran-0.35.0-gcc
   linux-custom_clang-C-Clang-13.0.0 linux-custom_clang-CXX-Clang-13.0.0
   mingw.org-C-GNU-4.9.3 mingw.org-CXX-GNU-4.9.3
   netbsd-C-GNU-4.8.5 netbsd-CXX-GNU-4.8.5

Tests/RunCMake/ParseImplicitLinkInfo/results/linux-Fortran-LFortran-0.35.0-clang.output

@@ -0,0 +1,3 @@
+libs=lfortran_runtime;m
+dirs=/usr/lib64
+linker_tool=

Tests/RunCMake/ParseImplicitLinkInfo/results/linux-Fortran-LFortran-0.35.0-gcc.output

@@ -0,0 +1,3 @@
+libs=lfortran_runtime;m
+dirs=/usr/lib64
+linker_tool=