[Driver] Link Flang runtime on FreeBSD, NetBSD, OpenBSD, DragonFly and Haiku (#69817)

Author: brad0

clang/lib/Driver/ToolChains/DragonFly.cpp

@@ -144,6 +144,16 @@ void dragonfly::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       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 (i.e.
+    // AddRuntTimeLibs).
+    if (D.IsFlangMode()) {
+      addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
+      addFortranRuntimeLibs(ToolChain, CmdArgs);
+      CmdArgs.push_back("-lm");
+    }
+
     if (Args.hasArg(options::OPT_pthread))
       CmdArgs.push_back("-lpthread");
 

clang/lib/Driver/ToolChains/FreeBSD.cpp

@@ -290,6 +290,20 @@ void freebsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       else
         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 (i.e.
+    // AddRuntTimeLibs).
+    if (D.IsFlangMode()) {
+      addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
+      addFortranRuntimeLibs(ToolChain, CmdArgs);
+      if (Profiling)
+        CmdArgs.push_back("-lm_p");
+      else
+        CmdArgs.push_back("-lm");
+    }
+
     if (NeedsSanitizerDeps)
       linkSanitizerRuntimeDeps(ToolChain, Args, CmdArgs);
     if (NeedsXRayDeps)

clang/lib/Driver/ToolChains/Haiku.cpp

@@ -95,6 +95,15 @@ void haiku::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     if (D.CCCIsCXX() && ToolChain.ShouldLinkCXXStdlib(Args))
       ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
 
+    // 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 (i.e.
+    // AddRuntTimeLibs).
+    if (D.IsFlangMode()) {
+      addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
+      addFortranRuntimeLibs(ToolChain, CmdArgs);
+    }
+
     CmdArgs.push_back("-lgcc");
 
     CmdArgs.push_back("--push-state");

clang/lib/Driver/ToolChains/NetBSD.cpp

@@ -314,6 +314,17 @@ void netbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
         ToolChain.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 (i.e.
+    // AddRuntTimeLibs).
+    if (D.IsFlangMode()) {
+      addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
+      addFortranRuntimeLibs(ToolChain, CmdArgs);
+      CmdArgs.push_back("-lm");
+    }
+
     if (NeedsSanitizerDeps)
       linkSanitizerRuntimeDeps(ToolChain, Args, CmdArgs);
     if (NeedsXRayDeps)

clang/lib/Driver/ToolChains/OpenBSD.cpp

@@ -213,6 +213,20 @@ void openbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       else
         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 (i.e.
+    // AddRuntTimeLibs).
+    if (D.IsFlangMode()) {
+      addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
+      addFortranRuntimeLibs(ToolChain, CmdArgs);
+      if (Profiling)
+        CmdArgs.push_back("-lm_p");
+      else
+        CmdArgs.push_back("-lm");
+    }
+
     if (NeedsSanitizerDeps) {
       CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins"));
       linkSanitizerRuntimeDeps(ToolChain, Args, CmdArgs);

flang/test/Driver/linker-flags.f90

@@ -5,6 +5,11 @@
 ! 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-unknown-freebsd %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,UNIX
+! RUN: %flang -### --target=x86_64-unknown-netbsd %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,UNIX
+! RUN: %flang -### --target=x86_64-unknown-openbsd %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,UNIX
+! RUN: %flang -### --target=x86_64-unknown-dragonfly %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,UNIX
+! RUN: %flang -### --target=x86_64-unknown-haiku %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,HAIKU
 ! 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
@@ -32,6 +37,10 @@
 ! DARWIN-SAME: -lFortranRuntime
 ! DARWIN-SAME: -lFortranDecimal
 
+! HAIKU-LABEL:  "{{.*}}ld{{(\.exe)?}}"
+! HAIKU-SAME: "[[object_file]]"
+! HAIKU-SAME: "-lFortran_main" "-lFortranRuntime" "-lFortranDecimal"
+
 ! MINGW-LABEL:  "{{.*}}ld{{(\.exe)?}}"
 ! MINGW-SAME: "[[object_file]]"
 ! MINGW-SAME: -lFortran_main