[clang] [Driver] Link Flang runtime on Solaris (PR #65644)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Rainer Orth (rorth)

<details>
<summary>Changes</summary>

I noticed that `flang-new` cannot link Fortran executables on Solaris since the runtime libs are missing.

This patch fixes this, following `Gnu.cpp`.  The `linker-flags.f90` testcase is augmented to test for this.

Tested on `amd64-pc-solaris2.11`, `sparcv9-sun-solaris2.11`, and `x86_64-pc-linux-gnu`.

---
Full diff: https://github.com/llvm/llvm-project/pull/65644.diff


2 Files Affected:

- (modified) clang/lib/Driver/ToolChains/Solaris.cpp (+8) 
- (modified) flang/test/Driver/linker-flags.f90 (+8-7) 


``````````diff
diff --git a/clang/lib/Driver/ToolChains/Solaris.cpp b/clang/lib/Driver/ToolChains/Solaris.cpp
index 36fe12608eefc6c..252c71d3379eab4 100644
--- a/clang/lib/Driver/ToolChains/Solaris.cpp
+++ b/clang/lib/Driver/ToolChains/Solaris.cpp
@@ -223,6 +223,14 @@ void solaris::Linker::ConstructJob(Compilation &C, const JobAction &JA,
         getToolChain().AddCXXStdlibLibArgs(Args, CmdArgs);
       CmdArgs.push_back("-lm");
     }
+    // Additional linker set-up and flags for Fortran. This is required in order
+    // to generate executables. As Fortran runtime depends on the C runtime,
+    // these dependencies need to be listed before the C runtime below.
+    if (D.IsFlangMode()) {
+      addFortranRuntimeLibraryPath(getToolChain(), Args, CmdArgs);
+      addFortranRuntimeLibs(getToolChain(), CmdArgs);
+      CmdArgs.push_back("-lm");
+    }
     if (Args.hasArg(options::OPT_fstack_protector) ||
         Args.hasArg(options::OPT_fstack_protector_strong) ||
         Args.hasArg(options::OPT_fstack_protector_all)) {
diff --git a/flang/test/Driver/linker-flags.f90 b/flang/test/Driver/linker-flags.f90
index 09b8a224df13828..fd61825eb4023a5 100644
--- a/flang/test/Driver/linker-flags.f90
+++ b/flang/test/Driver/linker-flags.f90
@@ -2,8 +2,9 @@
 ! invocation. These libraries are added on top of other standard runtime
 ! libraries that the Clang driver will include.
 
-! RUN: %flang -### -target ppc64le-linux-gnu %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,GNU
+! RUN: %flang -### -target ppc64le-linux-gnu %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,UNIX
 ! RUN: %flang -### -target aarch64-apple-darwin %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,DARWIN
+! RUN: %flang -### -target sparc-sun-solaris2.11 %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,UNIX
 ! RUN: %flang -### -target x86_64-windows-gnu %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,MINGW
 
 ! NOTE: Clang's driver library, clangDriver, usually adds 'libcmt' and
@@ -21,12 +22,12 @@
 !       run on any other platform, such as Windows that use a .exe
 !       suffix. Clang's driver will try to resolve the path to the ld
 !       executable and may find the GNU linker from MinGW or Cygwin.
-! GNU-LABEL:  "{{.*}}ld{{(\.exe)?}}"
-! GNU-SAME: "[[object_file]]"
-! GNU-SAME: -lFortran_main
-! GNU-SAME: -lFortranRuntime
-! GNU-SAME: -lFortranDecimal
-! GNU-SAME: -lm
+! UNIX-LABEL:  "{{.*}}ld{{(\.exe)?}}"
+! UNIX-SAME: "[[object_file]]"
+! UNIX-SAME: -lFortran_main
+! UNIX-SAME: -lFortranRuntime
+! UNIX-SAME: -lFortranDecimal
+! UNIX-SAME: -lm
 
 ! DARWIN-LABEL:  "{{.*}}ld{{(\.exe)?}}"
 ! DARWIN-SAME: "[[object_file]]"

``````````

</details>


https://github.com/llvm/llvm-project/pull/65644