Error When Bootstrapping Cmake:Log of Errors

c++11 std::unique_ptr error cmake 3.11.3 bootstrap

Actually the ./bootstrap script does try the different C++ standard flags with the compiler. So it should detect its capabilities automatically.

Please make sure you don't have any CXXFLAGS environment variable set and try from scratch again (the messages/warnings you get indicate several tries/errors in the same directory).

Output when Successful

As a reference on my Ubuntu calling CMake's ./bootstrap looks like this:

---------------------------------------------
CMake 3.11.20180423, Copyright 2000-2018 Kitware, Inc. and Contributors
Warning: This is an in-source build
Found GNU toolchain
C compiler on this system is: gcc
C++ compiler on this system is: g++  -std=gnu++1y
Makefile processor on this system is: make
g++ has setenv
g++ has unsetenv
g++ does not have environ in stdlib.h
g++ has stl wstring
g++ has <ext/stdio_filebuf.h>
---------------------------------------------

Debugging

For debugging your problem you also could:

• Call ./bootstrap --verbose
• Look into Bootstrap.cmk/cmake_bootstrap.log

Known Problem

I only once had a problem with bootstrap using clang compilers where I needed to do the following call:

export CXXFLAGS=-Xclang -std=c++1z -Xclang -stdlib=libc++

Alternative

If you just want to install the latest version see How to specify where CMake is installed in Ubuntu?

cmake configure error in 3.10.1 but not in 3.9.6

Since v3.10 onwards CMake is implemented in C++11:

Deprecated and Removed Features

Support for building CMake itself with C++98 compilers was dropped. CMake is now implemented using C++11.

This requires a capable compiler. The first version of GCC which is C++11 feature complete is GCC 4.8.1.

Gcc 4.4.5 is over 7 years old and more important, it doesn't support C++11 (from the error):

Cannot find a C++ compiler supporting C++11 on this system.

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Compiler update

As noted above, you need at least GCC 4.8.1. Here are some guides:

• https://gcc.gnu.org/wiki/InstallingGCC
• Installing gcc 4.8 on Debian
• https://unix.stackexchange.com/questions/112157/how-can-i-install-more-recent-versions-of-software-than-what-debian-provides
• https://nosemaj.org/debian-gcc-4-7

Error when enabling more warnings in CMake

As Stepthen Newell correctly pointed out in the comments, target_compile_definitions() adds compiler definitions, so replacing target_compile_definitions() with target_compile_options() does the trick, derp.

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