commit 272c4c3dee28a7b1c0a690cac3cb310165324794
author Ivan Pozdeev <vano@mail.mipt.ru> Wed Nov 07 00:32:54 2018 +0300
committer Brad King <brad.king@kitware.com> Wed Nov 07 07:38:54 2018 -0500
tree 2f4ee582e8c2f47fefc941fee439b6ebd30cdbee
parent db0445f0c860cc561baf3b38f296b7f338385d63

FindOpenMP: Log error output

Modules/FindOpenMP.cmake

diff --git a/Modules/FindOpenMP.cmake b/Modules/FindOpenMP.cmake
index c7376e3..cbc6ed8 100644
--- a/Modules/FindOpenMP.cmake
+++ b/Modules/FindOpenMP.cmake
@@ -270,6 +270,9 @@
           break()
         endif()
       endif()
+    else()
+      file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+        "Detecting ${LANG} OpenMP failed with the following output:\n${OpenMP_TRY_COMPILE_OUTPUT}\n\n")
     endif()
     set("${OPENMP_LIB_NAMES_VAR}" "NOTFOUND" PARENT_SCOPE)
     set("${OPENMP_FLAG_VAR}" "NOTFOUND" PARENT_SCOPE)
@@ -324,7 +327,8 @@
   string(REGEX REPLACE "[-/=+]" "" OPENMP_PLAIN_FLAG "${OPENMP_FLAG}")
   try_compile(OpenMP_SPECTEST_${LANG}_${OPENMP_PLAIN_FLAG} "${CMAKE_BINARY_DIR}" "${_OPENMP_TEST_SRC}"
               CMAKE_FLAGS "-DCOMPILE_DEFINITIONS:STRING=${OpenMP_${LANG}_FLAGS}"
-              COPY_FILE ${BIN_FILE})
+              COPY_FILE ${BIN_FILE}
+              OUTPUT_VARIABLE OpenMP_TRY_COMPILE_OUTPUT)
 
   if(${OpenMP_SPECTEST_${LANG}_${OPENMP_PLAIN_FLAG}})
     file(STRINGS ${BIN_FILE} specstr LIMIT_COUNT 1 REGEX "INFO:OpenMP-date")
@@ -332,6 +336,9 @@
     if("${specstr}" MATCHES "${regex_spec_date}")
       set(${SPEC_DATE} "${CMAKE_MATCH_1}" PARENT_SCOPE)
     endif()
+  else()
+    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
+        "Detecting ${LANG} OpenMP version failed with the following output:\n${OpenMP_TRY_COMPILE_OUTPUT}\n\n")
   endif()
 endfunction()