Prior to this commit, we only allowed CMake options to be specified according to
a finite set of values. For example if an option "WOLFSSL_FEATURE" was permitted
to take only the values "yes" and "no" and a user ran
`cmake -DWOLFSSL_FEATURE=ON`, that would fail because ON isn't in `[yes, no]`.
However, this behavior runs counter to CMake's way of evaluating boolean values,
which permits a variety of values that evaluate to true/false (see
https://cmake.org/cmake/help/latest/command/if.html#basic-expressions). This
commit will allow the user to specify any value for a build option. If it's not
in the predefined set of values, we use CMake's "if" logic to reduce the value
to yes or no.
* Remove NTRU and OQS
* Keep the DTLS serialization format backwards compatible.
* Remove n from mygetopt_long() call.
* Fix over-zealous deletion.
* Resolve problems found by @SparkiDev
For example, if a user does
```
cmake -DCMAKE_C_FLAGS="-DWOLFSSL_AESGCM_STREAM -DFP_MAX_BITS=16384" ..
```
definitions for `WOLFSSL_AESGCM_STREAM` and `FP_MAX_BITS 16384` should wind up
in options.h (same as the autotools build).
This commit makes all the binary CMake options (i.e. yes/no) conform to one
string convention: "yes/no." Previously, we had a mixture of yes/no and ON/OFF.
- Begin adding options to enable/disable different features.
- Increase minimum CMake version to 3.2.
- Support installation of the built files.
- Add checks for necessary include files, functions etc.
- Generate options.h and config.h.
- Use GNUInstallDirs to support installation, which is designed to be somewhat
cross-platform.
- Export wolfssl CMake target during installation, so others using CMake can
link against wolfssl easily.
- Disallow in-source builds.
- Place the generation of BUILD_* flags (controlled with AM_CONDITIONALs
in configure.ac) in a separate function in functions.cmake,
generate_build_flags.
- Implement the logic to conditionally add source files from
src/include.am in a function in functions.cmake, generate_lib_src_list.
- Exclude tls_bench from Windows. Doesn't compile with MSVC. WIP.
- Update INSTALL with latest CMake build instructions.
- Add a cmake/include.am to ensure CMake files get added to the distribution.