commit 7bb6397b4b1cbd69fe17b6830f57e66c7e84e665
author Petr Hosek <phosek@google.com> Thu Jan 21 00:01:18 2021 -0800
committer Copybara-Service <copybara-worker@google.com> Thu Jan 21 17:23:45 2021 -0800
tree 14b34f7ca7db9198b0bafa5232546e834dbee007
parent 6342e030221429672c6a3d1f32026ec1a1bd9f4c

[libc] Distinguish compiler and run failures

This is useful for debugging issues, for example when cross-compiling.

Differential Revision: https://reviews.llvm.org/D95118

GitOrigin-RevId: b0143352634ba7ed29f1db6ea576c0abfd0b4a29

cmake/modules/LLVMLibCCheckCpuFeatures.cmake

diff --git a/cmake/modules/LLVMLibCCheckCpuFeatures.cmake b/cmake/modules/LLVMLibCCheckCpuFeatures.cmake
index 86c3822..57dfbd9 100644
--- a/cmake/modules/LLVMLibCCheckCpuFeatures.cmake
+++ b/cmake/modules/LLVMLibCCheckCpuFeatures.cmake
@@ -115,12 +115,14 @@
     COMPILE_DEFINITIONS ${flags}
     COMPILE_OUTPUT_VARIABLE compile_output
     RUN_OUTPUT_VARIABLE run_output)
-  if(${compile_result} AND ("${run_result}" EQUAL 0))
+  if("${run_result}" EQUAL 0)
     set(${output_var}
         "${run_output}"
         PARENT_SCOPE)
+  elseif(NOT ${compile_result})
+    message(FATAL_ERROR "Failed to compile: ${compile_output}")
   else()
-    message(FATAL_ERROR "${compile_output}")
+    message(FATAL_ERROR "Failed to run: ${run_output}")
   endif()
 endfunction()