[Mips] Handle pseudo-target flags '-EL' and '-EB' and properly adjust

toolchain flags for MIPS targets.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@178232 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 48 insertions, 0 deletions

diff --git a/include/clang/Driver/Options.td b/include/clang/Driver/Options.td
index 0a364bb56c..0d75b8eb2f 100644
--- a/include/clang/Driver/Options.td
+++ b/include/clang/Driver/Options.td
@@ -822,6 +822,8 @@ def keep__private__externs : Flag<["-"], "keep_private_externs">;
 def l : JoinedOrSeparate<["-"], "l">, Flags<[LinkerInput, RenderJoined]>;
 def lazy__framework : Separate<["-"], "lazy_framework">, Flags<[LinkerInput]>;
 def lazy__library : Separate<["-"], "lazy_library">, Flags<[LinkerInput]>;
+def EL : Flag<["-"], "EL">, Flags<[DriverOption]>;
+def EB : Flag<["-"], "EB">, Flags<[DriverOption]>;
 def m32 : Flag<["-"], "m32">, Group<m_Group>, Flags<[DriverOption]>;
 def mqdsp6_compat : Flag<["-"], "mqdsp6-compat">, Group<m_Group>, Flags<[DriverOption,CC1Option]>,
   HelpText<"Enable hexagon-qdsp6 backward compatibility">;
diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 29ed5cffaa..4fb5502a48 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -1653,6 +1653,21 @@ static llvm::Triple computeTargetTriple(StringRef DefaultTargetTriple,
     }
   }
 
+  // Handle pseudo-target flags '-EL' and '-EB'.
+  if (Arg *A = Args.getLastArg(options::OPT_EL, options::OPT_EB)) {
+    if (A->getOption().matches(options::OPT_EL)) {
+      if (Target.getArch() == llvm::Triple::mips)
+        Target.setArch(llvm::Triple::mipsel);
+      else if (Target.getArch() == llvm::Triple::mips64)
+        Target.setArch(llvm::Triple::mips64el);
+    } else {
+      if (Target.getArch() == llvm::Triple::mipsel)
+        Target.setArch(llvm::Triple::mips);
+      else if (Target.getArch() == llvm::Triple::mips64el)
+        Target.setArch(llvm::Triple::mips64);
+    }
+  }
+
   // Skip further flag support on OSes which don't support '-m32' or '-m64'.
   if (Target.getArchName() == "tce" ||
       Target.getOS() == llvm::Triple::AuroraUX ||
diff --git a/test/Driver/mips-eleb.c b/test/Driver/mips-eleb.c
new file mode 100644
index 0000000000..8afe44f51c
--- /dev/null
+++ b/test/Driver/mips-eleb.c
@@ -0,0 +1,31 @@
+// REQUIRES: mips-registered-target
+//
+// Check that -EL/-EB options adjust the toolchain flags.
+//
+// RUN: %clang -target mips-unknown-linux-gnu -### \
+// RUN:        -EL -no-integrated-as %s 2>&1 \
+// RUN:        | FileCheck -check-prefix=MIPS32-EL %s
+// MIPS32-EL: "{{.*}}clang{{.*}}" "-cc1" "-triple" "mipsel-unknown-linux-gnu"
+// MIPS32-EL: "{{.*}}as{{(.exe)?}}" "-march" "mips32" "-mabi" "32" "-EL"
+// MIPS32-EL: "{{.*}}ld{{(.exe)?}}" {{.*}} "-m" "elf32ltsmip"
+//
+// RUN: %clang -target mips64-unknown-linux-gnu -### \
+// RUN:        -EL -no-integrated-as %s 2>&1 \
+// RUN:        | FileCheck -check-prefix=MIPS64-EL %s
+// MIPS64-EL: "{{.*}}clang{{.*}}" "-cc1" "-triple" "mips64el-unknown-linux-gnu"
+// MIPS64-EL: "{{.*}}as{{(.exe)?}}" "-march" "mips64" "-mabi" "64" "-EL"
+// MIPS64-EL: "{{.*}}ld{{(.exe)?}}" {{.*}} "-m" "elf64ltsmip"
+//
+// RUN: %clang -target mipsel-unknown-linux-gnu -### \
+// RUN:        -EB -no-integrated-as %s 2>&1 \
+// RUN:        | FileCheck -check-prefix=MIPS32-EB %s
+// MIPS32-EB: "{{.*}}clang{{.*}}" "-cc1" "-triple" "mips-unknown-linux-gnu"
+// MIPS32-EB: "{{.*}}as{{(.exe)?}}" "-march" "mips32" "-mabi" "32" "-EB"
+// MIPS32-EB: "{{.*}}ld{{(.exe)?}}" {{.*}} "-m" "elf32btsmip"
+//
+// RUN: %clang -target mips64el-unknown-linux-gnu -### \
+// RUN:        -EB -no-integrated-as %s 2>&1 \
+// RUN:        | FileCheck -check-prefix=MIPS64-EB %s
+// MIPS64-EB: "{{.*}}clang{{.*}}" "-cc1" "-triple" "mips64-unknown-linux-gnu"
+// MIPS64-EB: "{{.*}}as{{(.exe)?}}" "-march" "mips64" "-mabi" "64" "-EB"
+// MIPS64-EB: "{{.*}}ld{{(.exe)?}}" {{.*}} "-m" "elf64btsmip"