When `--debug-trycompile` is enabled, issue a log (with trace) for every
`try_compile` noting what directory is being used for the compilation.
This will make it easier to find the corresponding artifacts.
Closes: #24022
Change the SOURCE_FROM_ARG keyword to try_compile to SOURCE_FROM_CONTENT
(which we can do because it was recently added and hasn't been in a
release yet). The new name should be clearer as to what it does, and
also more consistent with the CONTENT arguments to some other commands.
Also, fix a typo in an error message.
Add ability to copy try_compile (and try_run) source files from
arbitrary locations into the operation directory. This is included for
the sake of completion and consolidation, although use cases which
actually require this may be rare.
Add ability to "feed" try_compile (and try_run) sources more directly,
either from literal content, or from a CMake variable which contains
literal content. This saves the user from needing a separate step to
write the content to a file, and allows for the sources to only exist in
the scratch directory.
Remove PROJECT support from try_run; it was never tested, has never been
documented, and it's unclear how it should even work (since CMake
wouldn't know what executable to run).
Introduce a new signature for the project flavor of try_compile (and
try_run) which removes the `bindir` argument and adds a required PROJECT
tag. This is similar to the SOURCES flavor added by commit aa9220d3
(try_compile: Add keyword-dispatched signature, 2022-09-02).
Replace our hard-coded default for `/Zi` with a first-class abstraction
to select the debug information format an enumeration of logical
names. We've long hesitated to do this because the idea of "debug
information format" touches on related concepts on several platforms.
Avoid that scope creep by simply defining an abstraction that applies
only when targeting the MSVC ABI on Windows.
Removing the old default flag requires a policy because existing
projects may rely on string processing to edit them and choose a
runtime library under the old behavior. Add policy CMP0141 to
provide compatibility.
Fixes: #10189
Introduce a new signature for try_compile (and try_run) which removes
the `bindir` argument and requires the SOURCES tag. This will eventually
allow us to add other ways of providing sources, but also allows us to
change the behavior without breaking compatibility.
The old signature uses a special, but non-unique temporary location
inside the specified `bindir`, which conventionally is just the
project's build directory. The new signature unconditionally uses the a
unique temporary directory which is unconditionally within the project's
build directory (which is no longer separately specified). This ensures
that successive runs do not overwrite previous runs, will simplify
debugging, and should also, eventually, allow us to execute multiple
trials in parallel.
Modify cmCoreTryCompile to only recognize try_run arguments when
actually parsing try_run. (The old behavior was to recognize try_run
arguments for try_compile also and then complain.)
This has a small chance that a try_run keyword will be consumed as part
of a multi-valued keyword argument. However, this behavior is more
consistent with other commands, as we don't normally treat keywords as
universally reserved. Also, the code is noticeably simplified.
In commit 6b427d8da9 (cmCoreTryCompile: Port to cmArgumentParser,
2022-08-01) we inadvertently dropped a matching quote during refactoring
of reporting unknown arguments given to try_compile/try_run. Add the
missing quote to match the old behavior and not have an imbalanced quote
in the warning.
Rename the booleans 's_ErrorOccured' and 's_FatalErrorOccured' to
's_ErrorOccurred' and 's_FatalErrorOccurred', respectively.
Rename the getters and setters to 'Get[Fatal]ErrorOccurred' and
'Set[Fatal]ErrorOccurred', and fix all uses across the codebase.
Add policy CMP0137 to propagate both our builtin variables and those
listed by `CMAKE_TRY_COMPILE_PLATFORM_VARIABLES` to `try_compile`
whole-project builds.
Inspired-by: Alexander Neumann <Alexander.Neumann@hamburg.de>
Fixes: #23219
Add a `CMAKE_WATCOM_RUNTIME_LIBRARY` variable to control the
runtime library selection. Add policy CMP0136 to switch to
in place of the old hard-coded default flags.
Fixes: #23178
When the Apple linker sees -headerpad_max_install_names and
bitcode is enabled with a flag like -fembed-bitcode, it issues a warning
and ignores the -headerpad_max_install_names flag. This causes
unrelated compiler and linker flag checks to fail for valid flags.
In f745e0497e (CheckCompilerFlags: Catch linker warning about ignored
flags, 2022-01-03), we started detecting linker warnings, which caused
a regression for projects that were setting -fembed-bitcode in their
CMAKE_CXX_FLAGS or similar. Prevent that regression by removing
the -headerpad_max_install_names linker flag when we know it will
warn and be ignored anyway.
Fixes: #23390
Issue: #23408
To avoid ambiguity on std::string assigment between the following two
cmProp cast operators:
* operator const std::string&() const noexcept
* operator cm::string_view() const noexcept
To handle safely the values used by CMake variables and properties,
introduce the class cmProp as a replacement from the simple pointer
to std::string instance.
The compile options `--march=<arch>` and `--mcpu=<cpu>` and the
link option `--cpu=<cpu>` are automatically added by CMake based
on `CMAKE_SYSTEM_PROCESSOR` or `CMAKE_SYSTEM_ARCH`. But this is not
sufficient, because armclang also supports enabling or disabling
features using `+<feature>`:
-mcpu=<name>[+[no]<feature>+...]
For example:
-mcpu=cortex-a57+nocrypto+nofp+nosimd+crc
(Reference: https://developer.arm.com/documentation/dui0774/k/Compiler-Command-line-Options/-mcpu?lang=en)
The problem is, even if a project adds a flag with features it needs,
CMake still adds flags, resulting in code that is compiled with wrong
CPU features and unable to run.
Add policy `CMP0123` to not automatically add compile or link options,
and let projects set them instead.
Co-Author: Brad King <brad.king@kitware.com>
Fixes: #21173
The target property `ISPC_HEADER_SUFFIX` and associated global
variable now can control the suffix used when generating the
C/C++ interoperability ISPC headers.
In addition the default suffix is now "_ispc.h" which matches the
common convention that the ISPC compiler team uses and recommends.
It was very easy to forgot to add all the possible language
properties that try_compile might need. Refactored the code
to make it harder to skip flags.
This changes adds the missing language properties for
the CUDA, Fortran, OBJC, OBJCXX, and Swift languages:
- CMAKE_<LANG>_COMPILER_EXTERNAL_TOOLCHAIN
- CMAKE_<LANG>_COMPILER_TARGET
- CMAKE_<LANG>_LINK_NO_PIE_SUPPORTED
- CMAKE_<LANG>_PIE_SUPPORTED
cmCoreTryCompile had significant code duplication around handling
languages that offer standard levels. This refactoring reduces
the complexity and makes it easier to add new languages in the
future.
Since commit e98588aaba (CUDA: Add CUDA_ARCHITECTURES target property,
2020-03-12), `CMAKE_CUDA_ARCHITECTURES` is both initialized and required
by policy CMP0104's `NEW` behavior. Inside a `try_compile` project we
use `cmake_minimum_required(VERSION ...)` with the current running
version of CMake. Now that our version number is 3.18, `CMP0104` gets
set to `NEW` in the `try_compile`. If the outer projects does not set
the policy then `CMAKE_CUDA_ARCHITECTURES` is not available and the
`try_compile` fails to generate.
Teach `try_compile` to check the outer project's policy status and
set policy CMP0104 to `OLD` if needed to match.
Fixes: #20794
Matthew Woehlke