[mips] Explicitly specify the linker emulation for MIPS on FreeBSD.

FreeBSD's mips64 builds O32 binaries for /usr/lib32 by default and
thus needs to be able to link O32 binaries which requires an explicit
linker emulation.  Go ahead and list all the linker emulation variants
for MIPS so that any supported MIPS ABI binary can be linked by any
linker supporting MIPS.

Reviewed By: atanasyan

Differential Revision: https://reviews.llvm.org/D48507

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@335691 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Driver/ToolChains/FreeBSD.cpp b/lib/Driver/ToolChains/FreeBSD.cpp
index b6c4e8fdd91c47631497ec7c78d3996d1cb864aa..9626ea906f18af67a27f7dbe8b90fbd5ce7eec15 100644 (file)
--- a/lib/Driver/ToolChains/FreeBSD.cpp
+++ b/lib/Driver/ToolChains/FreeBSD.cpp
@@ -165,16 +165,39 @@ void freebsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("--enable-new-dtags");
   }
 
-  // When building 32-bit code on FreeBSD/amd64, we have to explicitly
-  // instruct ld in the base system to link 32-bit code.
-  if (Arch == llvm::Triple::x86) {
+  // Explicitly set the linker emulation for platforms that might not
+  // be the default emulation for the linker.
+  switch (Arch) {
+  case llvm::Triple::x86:
     CmdArgs.push_back("-m");
     CmdArgs.push_back("elf_i386_fbsd");
-  }
-
-  if (Arch == llvm::Triple::ppc) {
+    break;
+  case llvm::Triple::ppc:
     CmdArgs.push_back("-m");
     CmdArgs.push_back("elf32ppc_fbsd");
+    break;
+  case llvm::Triple::mips:
+    CmdArgs.push_back("-m");
+    CmdArgs.push_back("elf32btsmip_fbsd");
+    break;
+  case llvm::Triple::mipsel:
+    CmdArgs.push_back("-m");
+    CmdArgs.push_back("elf32ltsmip_fbsd");
+    break;
+  case llvm::Triple::mips64:
+    CmdArgs.push_back("-m");
+    if (tools::mips::hasMipsAbiArg(Args, "n32"))
+      CmdArgs.push_back("elf32btsmipn32_fbsd");
+    else
+      CmdArgs.push_back("elf64btsmip_fbsd");
+    break;
+  case llvm::Triple::mips64el:
+    CmdArgs.push_back("-m");
+    if (tools::mips::hasMipsAbiArg(Args, "n32"))
+      CmdArgs.push_back("elf32ltsmipn32_fbsd");
+    else
+      CmdArgs.push_back("elf64ltsmip_fbsd");
+    break;
   }
 
   if (Arg *A = Args.getLastArg(options::OPT_G)) {

diff --git a/test/Driver/freebsd.c b/test/Driver/freebsd.c
index b6493823bcae2bb886e86ec7aa1915d3de8df0f3..48f7c8e7f29c59f31eeecd4d051984a810d2fe4d 100644 (file)
--- a/test/Driver/freebsd.c
+++ b/test/Driver/freebsd.c
@@ -42,6 +42,27 @@
 // RUN:   --sysroot=%S/Inputs/multiarch_freebsd64_tree -print-search-dirs 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-LIB32PATHS %s
 //
+// Check that MIPS passes the correct linker emulation.
+//
+// RUN: %clang -target mips-freebsd %s -### %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-MIPS-LD %s
+// CHECK-MIPS-LD: ld{{.*}}" {{.*}} "-m" "elf32btsmip_fbsd"
+// RUN: %clang -target mipsel-freebsd %s -### %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-MIPSEL-LD %s
+// CHECK-MIPSEL-LD: ld{{.*}}" {{.*}} "-m" "elf32ltsmip_fbsd"
+// RUN: %clang -target mips64-freebsd %s -### %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-MIPS64-LD %s
+// CHECK-MIPS64-LD: ld{{.*}}" {{.*}} "-m" "elf64btsmip_fbsd"
+// RUN: %clang -target mips64el-freebsd %s -### %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-MIPS64EL-LD %s
+// CHECK-MIPS64EL-LD: ld{{.*}}" {{.*}} "-m" "elf64ltsmip_fbsd"
+// RUN: %clang -target mips64-freebsd -mabi=n32 %s -### %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-MIPSN32-LD %s
+// CHECK-MIPSN32-LD: ld{{.*}}" {{.*}} "-m" "elf32btsmipn32_fbsd"
+// RUN: %clang -target mips64el-freebsd -mabi=n32 %s -### %s 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-MIPSN32EL-LD %s
+// CHECK-MIPSN32EL-LD: ld{{.*}}" {{.*}} "-m" "elf32ltsmipn32_fbsd"
+//
 // Check that the new linker flags are passed to FreeBSD
 // RUN: %clang -no-canonical-prefixes -target x86_64-pc-freebsd8 -m32 %s \
 // RUN:   --sysroot=%S/Inputs/multiarch_freebsd64_tree -### 2>&1 \