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| author | Hong Xu <hong@topbug.net> | 2019-07-07 22:47:06 (GMT) |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2019-07-26 19:09:28 (GMT) |
| commit | 72fcadb007261f8e1883040d7dc5643e3555aa45 (patch) | |
| tree | 0a7f2ab77a257930351375e04a61223149f74bdc /Modules/CheckCXXSymbolExists.cmake | |
| parent | 93f10f06b3b86085a180e5259f653646e1705baf (diff) | |
| download | CMake-72fcadb007261f8e1883040d7dc5643e3555aa45.zip CMake-72fcadb007261f8e1883040d7dc5643e3555aa45.tar.gz CMake-72fcadb007261f8e1883040d7dc5643e3555aa45.tar.bz2 | |
CheckCXXSymbolExists: Make C++-syntax symbols work on more compilers
On some compilers the syntax `#ifndef std::fopen` will always lead to
compilation error. Avoid generating it in the check.
Diffstat (limited to 'Modules/CheckCXXSymbolExists.cmake')
| -rw-r--r-- | Modules/CheckCXXSymbolExists.cmake | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Modules/CheckCXXSymbolExists.cmake b/Modules/CheckCXXSymbolExists.cmake index b112094..5c9079d 100644 --- a/Modules/CheckCXXSymbolExists.cmake +++ b/Modules/CheckCXXSymbolExists.cmake @@ -27,6 +27,17 @@ Check if a symbol exists as a function, variable, or macro in ``C++``. not be recognized: consider using the :module:`CheckTypeSize` or :module:`CheckCXXSourceCompiles` module instead. +.. note:: + + This command is unreliable when ``<symbol>`` is (potentially) an overloaded + function. Since there is no reliable way to predict whether a given function + in the system environment may be defined as an overloaded function or may be + an overloaded function on other systems or will become so in the future, it + is generally advised to use the :module:`CheckCXXSourceCompiles` module for + checking any function symbol (unless somehow you surely know the checked + function is not overloaded on other systems or will not be so in the + future). + The following variables may be set before calling this macro to modify the way the check is run: |