Since commit 6baf65ec46 (ASM: Do not consider MSVC C/CXX compiler for
generic ASM, 2025-04-08) we no longer mistake `cl` for an assembler.
However, some projects unconditionally enable ``ASM``, which worked
on Windows only due to that bug. Restore compatibility with such
projects by guarding the change behind a new policy ``CMP0194``.
Fixes: #26907
Issue: #26617
Prior to commit abfe98ce6c (ASM: Consider C/CXX compilers only if
enabled, 2025-04-08) one could pass `-DCMAKE_C_COMPILER=...` to
configure a project that enables `ASM` before/without `C` or `CXX`.
This was previously allowed accidentally as a side effect of the way we
implemented support for using the selected `C` or `CXX` compiler for
`ASM`. Restore it for compatibility, but also preserve the effect of
commit 6baf65ec46 (ASM: Do not consider MSVC C/CXX compiler for generic
ASM, 2025-04-08) by excluding `cl`.
Add TIClang compiler ID and support in compiler modules. Update
documentation. Add rudimentary RunCMake test for TIClang to test
basic functionality.
Fixes: #24619
Using a single ID 'IntelLLVM' for the suite of Intel compilers based on
the LLVM backend. The 'IntelLLVM' ID are used for C, C++, and Fortran.
Data Parallel C++ will be handled in a separate commit.
The C and C++ definitions are based on the Clang definitions. The Intel
LLVM-based C and C++ compilers are based on the Clang front end, so
existing Clang options are more likely to be a good match than options
for the older Intel compilers.
Fortran is based on the older Fortran front end with the LLVM backend.
It has a similar interface to the older versions, though many options
are shared with the C and C++ compilers.
Fixes: #21561
Signed-off-by: William R. Dieter <william.r.dieter@intel.com>
Capture CMAKE_<LANG>_COMPILER_ARG1 from CMAKE_<LANG>_COMPILER in the
same fashion that it is from $ENV{<LANG>}.
Since get_filename_component() returns a single string of all the
arguments from $ENV{<LANG>}, a single string of arguments will be
constructed from the items contained in CMAKE_<LANG>_COMPILER.
Fixes#20089
For example, with GNU `as`, we match `GNU assembler`, but with GNU `gcc`
as the assembler, we do not match anything. Distinguishing these cases
may be useful for constructing assembler command lines.
The compiler identification message was modified in commit ea83d0f8fb
(IAR: Generalize and add support for IAR RX compiler, 2019-04-05) to
include the architecture id since IAR compilers are arch-specific.
Revise the logic to avoid modifying the message for other compilers.
MS-style command-line tools accept either `/` or `-` for command-line
options. Prefer `-` over `/` so that non-MS tools do not treat it as a
path.
Fixes: #18941
Add missing vendor table entries for Clang and AppleClang to identify
them. Previously this worked only if Clang was also enabled as a C or
CXX compiler first because we used to copy the C compiler id. However,
that was removed by commit v3.13.0-rc1~44^2 (ASM: Search for full path
even when using C or C++ compiler, 2018-09-26).
Fixes: #18575
When `CMAKE_{C,CXX}_COMPILER` is set but `CMAKE_ASM*_COMPILER` is
not, we copy the C or C++ compiler to use as the ASM compiler.
In this case we still need to search for the ASM compiler in case
the C or C++ compiler is not known as an absolute path.
Also do not copy the compiler id setting and let the normal detection
take place. The C compiler id may not exist if the language has not
been enabled.
Fixes: #18406
The switch was not considering some languages, such as `ASM`.
Instead of memorizing the list of languages in the condition,
use a language specified by the includer.
Fixes: #17510
Make the implementation for this compiler more complete.
IAR has multiple C++ modes, historically they were reduced c++ versions
for embedded that gradually improved to the full standard (which can be
reduced again by e.g. disabling rtti and exceptions). The new
implementation picks the best available, but the c++ mode can also be
overridden by defining `CMAKE_IAR_CXX_FLAG`.
Add C/C++ standard flags so that all modes up to and including the last
supported standard are defined.
Fixes: #16826
Compilers such as MSVC and IAR may have variants that target different
architectures. We have been using a `MSVC_<LANG>_ARCHITECTURE_ID`
variable to hold this information for MSVC. Add an alternative with a
more general name (later we can port MSVC to it too).
This additional information may be needed to generate proper invocations
of the compiler based on its architecture variant.
The variables recently added by commit b9d36826 (Add 'CMAKE_GCC_AR' and
'CMAKE_GCC_RANLIB' variables, 2017-03-08) are more appropriately managed
with language-specific names rather than toolchain-specific names.
Clang may raise an error when passed a `-march=` option that doesn't
correspond to the current target triple. CMake cannot pass the target
triple when determining the compiler id because it doesn't know how yet,
but it does pass along user-specified flags. This breaks when those
user-specified flags include `-march=`. Fix this use case by also
trying to find the compiler id without the user-specified flags.
Fixes: #16587
Split the arguments off of the `ASM${ASM_DIALECT}` environment variable
as is done for `CC` and other compiler variables. This fixes using CMake
when `ASM*` is used to pass additional target flags, e.g. when one uses
`ASM=${CC}`.
Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool. Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience. Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.
Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices. It also references version control
history for more precise information. Therefore we no longer need to spell
out the list of Contributors in each source file notice.
Replace CMake per-source copyright/license notice headers with a short
description of the license and links to `Copyright.txt` and online information
available from "https://cmake.org/licensing". The online URL also handles
cases of modules being copied out of our source into other projects, so we
can drop our notices about replacing links with full license text.
Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority
of the replacements mechanically. Manually fix up shebang lines and trailing
newlines in a few files. Manually update the notices in a few files that the
script does not handle.
Since commit 7d47c693 (Drop compatibility with CMake < 2.4, 2013-10-08)
we no longer need to use the configure_file IMMEDIATE option to support
compatibility modes less than 2.0.
