[libFuzzer] Re-enable libFuzzer on i386 Linux and fix test

Summary:
Re-enable libFuzzer on i386 Linux after it was accidentally
disabled.

Also disable gc-sections.test on i386 since lld isn't
garbage collecting properly with ASAN on i386.

Reviewers: morehouse

Reviewed By: morehouse

Subscribers: srhines, mgorny, #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D61415

llvm-svn: 359802

compiler-rt/cmake/config-ix.cmake

@@ -232,7 +232,14 @@ set(ALL_ASAN_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64}
     ${MIPS32} ${MIPS64} ${PPC64} ${S390X})
 set(ALL_CRT_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM32} ${ARM64})
 set(ALL_DFSAN_SUPPORTED_ARCH ${X86_64} ${MIPS64} ${ARM64})
-if(LINUX)
+
+if(ANDROID)
+  set(OS_NAME "Android")
+else()
+  set(OS_NAME "${CMAKE_SYSTEM_NAME}")
+endif()
+
+if(OS_NAME MATCHES "Linux")
   set(ALL_FUZZER_SUPPORTED_ARCH ${X86} ${X86_64} ${ARM64})
 else()
   set(ALL_FUZZER_SUPPORTED_ARCH ${X86_64} ${ARM64})
@@ -526,12 +533,6 @@ if(COMPILER_RT_SUPPORTED_ARCH)
 endif()
 message(STATUS "Compiler-RT supported architectures: ${COMPILER_RT_SUPPORTED_ARCH}")
 
-if(ANDROID)
-  set(OS_NAME "Android")
-else()
-  set(OS_NAME "${CMAKE_SYSTEM_NAME}")
-endif()
-
 set(ALL_SANITIZERS asan;dfsan;msan;hwasan;tsan;safestack;cfi;scudo;ubsan_minimal)
 set(COMPILER_RT_SANITIZERS_TO_BUILD all CACHE STRING
     "sanitizers to build if supported on the target (all;${ALL_SANITIZERS})")

compiler-rt/test/fuzzer/gc-sections.test

@@ -1,4 +1,6 @@
 REQUIRES: linux, lld-available
+# LLD isn't pruning functions as we expect it to with ASAN on i386.
+UNSUPPORTED: i386
 
 No gc-sections:
 RUN: %cpp_compiler %S/GcSectionsTest.cpp -o %t