Swift is used as the linker for non-swift files because it needs to pull
files like swiftrt.o in when swift symbols are present to ensure that
the swift runtime is linked.
The swift driver uses clang as the underlying linker, which pulls in
crtbegin.o and friends when appropriate, so using Swift as a linker for
C/C++ libraries is fine.
The output-file-map was getting passed to all Swift invocations,
regardless of whether or not we generated one. This patch changes it so
that we only include the output-file-map in the Swift compiler
invocation if we have actually generated the file.
compile_commands.json was being written for every permutation of
cross configurations. Deduplicate so only one command is output
for each configuration.
Fixes: #23733
C++ modules have two variants which are of importance to CMake:
- `CXX_MODULES`: interface modules (those using `export module M;`,
`export module M:part;`, or `module M:internal_part;`)
- `CXX_MODULE_HEADER_UNITS`: importable header units
Creating C++ modules or partitions are *not* supported in any other
source listing. This is because the source files must be installed (so
their scope matters), but not part of usage requirements (what it means
for a module source to be injected into a consumer is not clear at this
moment). Due to the way `FILE_SET` works with scopes, they are a perfect
fit as long as `INTERFACE` is not allowed (which it is not).
It is unused since commit c564a3e3ff (Ninja: Always compile sources
using absolute paths, 2021-05-19, v3.21.0-rc1~129^2), which left
behind a FIXME comment to eventually remove it.
The target properties `CUDA_SEPARABLE_COMPILATION` and `CUDA_PTX_COMPILATION`
now aren't mutually exclusive and can now be used together on the same
target.
When running the module dependencies scan tool for for a language that
does not compile the preprocessed output, we do not actually put the
preprocessed output in the build graph. However, the value of
`CMAKE_EXPERIMENTAL_<LANG>_SCANDEP_SOURCE` may reference the placeholder
for the preprocessed source. Populate the placeholder to keep the file
out of the way. In particular, do not clobber the `.ddi` file.
Since commit 33a8e0bb09 (cmNinjaTargetGenerator: Simplify scan rule
depfile selection, 2020-11-06, v3.20.0-rc1~516^2~1), the `$out` of the
scan rule always matches our `.rsp` file selection, so use `$out.rsp`.
The Ninja generator traditionally referenced source files and include
directories using paths relative to the build directory if they could be
expressed without a `../` sequence that leaves the build and source
directories. For example, when using a `build/` directory inside the
source tree, sources would be compiled as `-c ../src.c` and include
directories would be referenced as `-I ../include`. This approach
matches the traditional Ninja convention of using relative paths
whenever possible, but has undesirable side effects such as:
* Compiler diagnostic messages may not use absolute paths, making it
harder for IDEs/editors to find the referenced sources or headers.
* Debug symbols may not use absolute paths, making it harder for
debuggers to find the referenced sources or headers.
* Different results depending on the path to the build tree relative
to the source tree.
* Inconsistent with the Makefile generators, which use absolute paths.
Switch to always using absolute paths to reference source files and
include directories on compiler command lines. While alternative
solutions for diagnostic messages and debug symbols may exist with
specific tooling, this is the simplest and most consistent approach.
Note that a previous attempt to do this in commit 955c2a630a (Ninja: Use
full path for all source files, 2016-08-05, v3.7.0-rc1~275^2) was
reverted by commit 666ad1df2d (Revert "Ninja: Use full path for all
source files", 2017-02-24, v3.8.0-rc2~9^2) due to problems hooking up
depfile dependencies on generated files. This time, the changes in
commit 2725ecff38 (Ninja: Handle depfiles with absolute paths to
generated files, 2021-05-19) should avoid those problems.
Fixes: #13894, #17450
The `GetSourceFilePath` method is meant only for compiled sources, and
automatically handles converting it to a path for the Ninja build
manifest. Rename the method to clarify both.
These fields are specified by our `P1689r3` paper, but are not actually
needed. The dependencies of the scanning results themselves can be
captured via normal depfile logic. Avoid saving this possibly-large
information in the scanning results. It is not needed by later steps.
Make the `config` argument non-optional so all callers must be explicit.
Convert the path style argument to an enumeration to make its role clear
at call sites.
The path style argument is implemented by `ConvertToIncludeReference`,
which was introduced with the Ninja generator by commit 5b114c9bee
(Introduce a cmLocalGenerator::ConvertToIncludeReference function,
2011-09-07, v2.8.7~187^2~4). Its only purpose is to allow the Ninja
generator to use relative paths in `-I` flags. Add a comment explaining
this role.
39cbbb59a5 ninja: add experimental infrastructure to generate gcc-format modmap files
791b4d26d6 ninja: add experimental infrastructure to generate modmap files with dyndep
4b23359117 ninja: Add experimental infrastructure for C++20 module dependency scanning
f814d3b3c6 cmNinjaTargetGenerator: use $OBJ_FILE for the object
b0fc2993e1 Treat the '.mpp' file extension as C++ code
988f997100 cmScanDepFormat: Fix name of our internal tool in parse errors
dacd93a2db ninja: De-duplicate version numbers required for ninja features
533386ca29 cmStandardLevelResolver: Factor out helper to capture stoi exceptions
Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Ben Boeckel <ben.boeckel@kitware.com>
Acked-by: Robert Maynard <robert.maynard@kitware.com>
Acked-by: Shannon Booth <shannon.ml.booth@gmail.com>
Merge-request: !5562
The new target property `EXPORT_COMPILE_COMMANDS` associated with the
existing global variable can be used to optionally configure targets for
their compile commands to be exported.
Fixes: #19462
The scan step may need to output additional information for the
compiler, not just the build tool. The modmap is assumed to be beside
the object output. Additional refactoring may open up a channel to
inform per-source paths to the dyndep rule in the future, but is not
done here.
Optionally enable this infrastructure through an undocumented
`CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP` variable. Currently this is
experimental and intended for use by compiler writers to implement their
scanning tools. Warn as such when the feature is activated. Later when
compilers provide the needed scanning tools we can enable this variable
from our corresponding compiler information modules. It is never meant
to be set by project code.
When enabled, generate a build graph similar to what we use for Fortran
module dependencies. There are some differences needed because we can
scan dependencies without explicit preprocessing, and can directly
compile the original source afterward.
Co-Author: Ben Boeckel <ben.boeckel@kitware.com>
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.
48aac247e9 Compile with explicit language flag when source LANGUAGE property is set
2e67a75acd Embarcadero: Simplify addition of -P flag for C++
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5522
This change was originally made by commit 74b1c9fc8e (Explicitly specify
language flag when source LANGUAGE property is set, 2020-06-01,
v3.19.0-rc1~722^2), but it was reverted by commit 30aa715fac (Revert
"specify language flag when source LANGUAGE property is set",
2020-11-19) to restore compatibility with pre-3.19 behavior.
Implement the change again, but add policy CMP0119 to make this change
while preserving compatibility with existing projects.
Note that the `Compiler/{Clang,Intel,MSVC}-CXX` modules do not need to
specify `-TP` for their MSVC-like variants because we already use the
flag in `CMAKE_CXX_COMPILE_OBJECT`. Similarly for `Compiler/XL-CXX`
and `Platform/Windows-Embarcadero`.
Note also that this does not seem possible to implement for XL C.
Even with `-qsourcetype=c`, `xlc` complains about an unknown suffix:
`1501-218 (W) file /.../AltExtC.zzz contains an incorrect file suffix`.
It returns non-zero even with `-qsuppress=1501-218`.
Co-Author: Robert Maynard <robert.maynard@kitware.com>
Fixes: #14516, #20716
These changes are in preparation of compiler generated dependencies support
for Makefiles generators
* compiler output and dependency target can be different for Makefiles generators
* resolve inconsistency naming for dependency file place-holder
