Do not attach a custom command to a target if it is already attached to one of
the target's dependencies. The command's output will be available by the time
the target needs it because the dependency containing the command will have
already been built.
This may break existing projects that do not properly mark non-created
outputs with the `SYMBOLIC` property. Previously a chain of two custom
commands whose intermediate dependency is not created would put both
commands in a dependent project's Makefile even if the first command is
also in its dependency's Makefile. The first command would run twice
but the build would work. Now the second command needs an explicit
`SYMBOLIC` mark on its input to tell CMake that it is not expected to
exist. To maintain compatibility with projects that left out the mark,
add a policy activating the behavior.
Since commit d74e651b78 (Makefiles: Re-implement makefile target path
escaping and quoting, 2020-04-10, v3.18.0-rc1~334^2~1), `WriteMakeRule`
now correctly escapes `$` in make target paths as `$$`. However, this
caused an existing call site to escape the `$(VERBOSE)` variable
reference in the `.SILENT` prefix, making it ineffective. Sub-makefiles
are invoked with `MAKESILENT`, so this bug matters only for the `all`
target, which emits progress messages from toplevel.
Before:
# Suppress display of executed commands.
$$(VERBOSE).SILENT:
After:
# Suppress display of executed commands.
$(VERBOSE).SILENT:
Code paths that write makefile target paths use a combination of
`cmSystemTools::ConvertToOutputPath` and `cmMakeSafe`. Some were
missing the latter. Wrap these two steps up into a dedicated
`ConvertToMakefilePath` method provided on both the local and global
generators.
ec7928ef26 use _s to construct static string_views at several places
94de927cab VS10Generator: avoid many string allocations
8ca2504a4d use string_views to avoid memory allocations
761f1adcae check for a valid URL scheme before starting to do any splitting
ef778d77e0 replace std::string::substr() with operations that do not allocate memory
77616f4681 pass cm::string_view to cmVisualStudioSlnParser::ParseTag()
ada6a3226f use cm::string_view for language extension lookups
48adc29721 replace "std::string::find(x) == 0" with cmHasPrefix()
...
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !4501
Since GNU make 4.3, `.SILENT:` no longer causes nested `$(MAKE)` calls
to get `-s` implicitly. Add the `-s` flag explicitly on such calls to
suppress messages about Entering/Leaving directories.
Fixes: #20487
The `std::endl` manupulator, except inserting `\n` character, also
performs `os.flush()`, which may leads to undesired effects (like
disk I/O in the middle of forming data strings). For the
`std::stringstream` it also has no meaning.
These are not suffix rules and are not suppressed by the empty
`.SUFFIXES` recipe. Additionally, the old `SUFFIXES =` code didn't
actually accomplish this, so remove it.
2d0100fac7 replace remove and remove_directory with rm in tests
5239fc5c75 cmake -E: Add rm with improved semantics over remove and remove_directory
Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !3949
cmGeneratorExpression::Evaluate is a shortcut when only the evaluated string is
needed or an instance of cmCompiledGeneratorExpression cannot be cached.
Fixes: #19686
Provide a standardized way to handle the C++ "standard" headers
customized to be used with current CMake C++ standard constraints.
Offer under directory `cm` headers which can be used as direct
replacements of the standard ones. For example:
#include <cm/string_view>
can be used safely for CMake development in place of the `<string_view>`
standard header.
Fixes: #19491
Set the MinTypeNameLength option to an impossibly high value in order
to limit the diagnostics to iterators. Leave new expressions and cast
expressions for later.
This patch is generated by a python script that uses regular expressions to
search for string concatenation patterns of the kind
```
std::string str = <ARG0>;
str += <ARG1>;
str += <ARG2>;
...
```
and replaces them with a single `cmStrCat` call
```
std::string str = cmStrCat(<ARG0>, <ARG1>, <ARG2>, ...);
```
If any `<ARGX>` is itself a concatenated string of the kind
```
a + b + c + ...;
```
then `<ARGX>` is split into multiple arguments for the `cmStrCat` call.
If there's a sequence of literals in the `<ARGX>`, then all literals in the
sequence are concatenated and merged into a single literal argument for
the `cmStrCat` call.
Single character strings are converted to single char arguments for
the `cmStrCat` call.
`std::to_string(...)` wrappings are removed from `cmStrCat` arguments,
because it supports numeric types as well as string types.
`arg.substr(x)` arguments to `cmStrCat` are replaced with
`cm::string_view(arg).substr(x)`
This replaces invocations of
- `cmSystemTools::IsInternallyOn` with `cmIsInternallyOn`
- `cmSystemTools::IsNOTFOUND` with `cmIsNOTFOUND`
- `cmSystemTools::IsOn` with `cmIsOn`
- `cmSystemTools::IsOff` with `cmIsOff`
