From: Kefu Chai <kchai@redhat.com>
Date: Mon, 26 Apr 2021 14:38:35 +0000 (+0800)
Subject: cmake: check for empty string by its value
X-Git-Tag: v17.1.0~2082^2~10
X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=d275875b0e3d76bfe603dbc95e55e309e9b72e10;p=ceph.git

cmake: check for empty string by its value

the behavior of cmake 3.17 is a little bit different as it consider

NOT _library STREQUAL ""

as true, if ${_library} is "".

Signed-off-by: Kefu Chai <kchai@redhat.com>
---

diff --git a/cmake/modules/FindStdFilesystem.cmake b/cmake/modules/FindStdFilesystem.cmake
index 5d3336571ce9..c66f572459b6 100644
--- a/cmake/modules/FindStdFilesystem.cmake
+++ b/cmake/modules/FindStdFilesystem.cmake
@@ -14,7 +14,7 @@ macro(try_std_filesystem_library _library _result _already_included)
     ${_std_filesystem_try_compile_arg})
   unset(_std_filesystem_try_compile_arg)
   if(_std_filesystem_compiles)
-    if(NOT _library STREQUAL "")
+    if(NOT ${_library} STREQUAL "")
       set(${_result} ${_library})
     else()
       set(${_already_included} "included by standard library")