Index: llvm/trunk/lib/Analysis/TargetLibraryInfo.cpp
===================================================================
--- llvm/trunk/lib/Analysis/TargetLibraryInfo.cpp
+++ llvm/trunk/lib/Analysis/TargetLibraryInfo.cpp
@@ -413,17 +413,17 @@
     TLI.setUnavailable(LibFunc_flsll);
   }
 
-  // The following functions are available on Linux,
-  // but Android uses bionic instead of glibc.
-  if (!T.isOSLinux() || T.isAndroid()) {
+  // The following functions are only available on GNU/Linux (using glibc).
+  // Linux variants without glibc (eg: bionic, musl) may have some subset.
+  if (!T.isOSLinux() || !T.isGNUEnvironment()) {
     TLI.setUnavailable(LibFunc_dunder_strdup);
     TLI.setUnavailable(LibFunc_dunder_strtok_r);
     TLI.setUnavailable(LibFunc_dunder_isoc99_scanf);
     TLI.setUnavailable(LibFunc_dunder_isoc99_sscanf);
     TLI.setUnavailable(LibFunc_under_IO_getc);
     TLI.setUnavailable(LibFunc_under_IO_putc);
-    // But, Android has memalign.
-    if (!T.isAndroid())
+    // But, Android and musl have memalign.
+    if (!T.isAndroid() && !T.isMusl())
       TLI.setUnavailable(LibFunc_memalign);
     TLI.setUnavailable(LibFunc_fopen64);
     TLI.setUnavailable(LibFunc_fseeko64);
Index: llvm/trunk/test/Transforms/ConstProp/calls-math-finite.ll
===================================================================
--- llvm/trunk/test/Transforms/ConstProp/calls-math-finite.ll
+++ llvm/trunk/test/Transforms/ConstProp/calls-math-finite.ll
@@ -1,5 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -constprop -S | FileCheck %s
+; RUN: opt < %s -constprop -S -mtriple=unknown-unknown-linux-musl | FileCheck -check-prefix=MUSL %s
 
 ; Test to verify constant folding can occur when math routines are mapped
 ; to the __<func>_finite versions of functions due to __FINITE_MATH_ONLY__
@@ -57,6 +58,48 @@
 ; CHECK-NEXT:    store float 0x40240926E0000000, float* [[SLOTF]]
 ; CHECK-NEXT:    ret void
 ;
+; MUSL-LABEL: @T(
+; MUSL-NEXT:    [[SLOT:%.*]] = alloca double
+; MUSL-NEXT:    [[SLOTF:%.*]] = alloca float
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+; MUSL-NEXT:    call
+; MUSL-NEXT:    store
+
   %slot = alloca double
   %slotf = alloca float
 
Index: llvm/trunk/test/Transforms/InferFunctionAttrs/annotate.ll
===================================================================
--- llvm/trunk/test/Transforms/InferFunctionAttrs/annotate.ll
+++ llvm/trunk/test/Transforms/InferFunctionAttrs/annotate.ll
@@ -1,7 +1,7 @@
 ; RUN: opt < %s -mtriple=x86_64-- -inferattrs -S | FileCheck %s
 ; RUN: opt < %s -mtriple=x86_64-- -passes=inferattrs -S | FileCheck %s
 ; RUN: opt < %s -mtriple=x86_64-apple-macosx10.8.0 -inferattrs -S | FileCheck -check-prefix=CHECK -check-prefix=CHECK-DARWIN %s
-; RUN: opt < %s -mtriple=x86_64-unknown-linux -inferattrs -S | FileCheck -check-prefix=CHECK -check-prefix=CHECK-LINUX %s
+; RUN: opt < %s -mtriple=x86_64-unknown-linux-gnu -inferattrs -S | FileCheck -check-prefix=CHECK -check-prefix=CHECK-LINUX %s
 ; RUN: opt < %s -mtriple=nvptx -inferattrs -S | FileCheck -check-prefix=CHECK-NVPTX %s
 
 ; operator new routines