From: Vladislav Shchapov <vladislav@shchapov.ru>
Date: Tue, 17 Sep 2024 15:10:34 +0000 (+0500)
Subject: Fix overridde CMAKE_C_STANDARD, CMAKE_C_STANDARD_REQUIRED, CMAKE_C_EXTENSIONS. False... 
X-Git-Tag: 2.2.3~43
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=efca01266d0dc03323fb26dbc3f5c6e190cec547;p=thirdparty%2Fzlib-ng.git

Fix overridde CMAKE_C_STANDARD, CMAKE_C_STANDARD_REQUIRED, CMAKE_C_EXTENSIONS. False value is allowed for CMAKE_C_STANDARD_REQUIRED and CMAKE_C_EXTENSIONS.

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index deb075d1..dca75063 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,13 +9,13 @@ message(STATUS "Using CMake version ${CMAKE_VERSION}")
 # If not specified on the command line, enable C11 as the default
 # Configuration items that affect the global compiler environment standards
 # should be issued before the "project" command.
-if(NOT CMAKE_C_STANDARD)
+if(NOT DEFINED CMAKE_C_STANDARD)
     set(CMAKE_C_STANDARD 11)          # The C standard whose features are requested to build this target
 endif()
-if(NOT CMAKE_C_STANDARD_REQUIRED)
+if(NOT DEFINED CMAKE_C_STANDARD_REQUIRED)
     set(CMAKE_C_STANDARD_REQUIRED ON) # Boolean describing whether the value of C_STANDARD is a requirement
 endif()
-if(NOT CMAKE_C_EXTENSIONS)
+if(NOT DEFINED CMAKE_C_EXTENSIONS)
     set(CMAKE_C_EXTENSIONS OFF)       # Boolean specifying whether compiler specific extensions are requested
 endif()
 set(VALID_C_STANDARDS "99" "11")