From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 27 Jun 2018 00:02:16 +0000 (+0000)
Subject: [mips] Explicitly specify the linker emulation for MIPS on FreeBSD.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=affe61a68001370fed6047bec14f7c33519f3731;p=clang

[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 b6c4e8fdd9..9626ea906f 100644
--- 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 b6493823bc..48f7c8e7f2 100644
--- 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 \