COMPONENT_DIRS and EXTRA_COMPONENT_DIRS should be defined as CMake
lists, using 'set' or 'list' commands. Some applications written
for earlier versions of ESP-IDF used to define these variables as
space separated strings.
For example, the following is correct:
set(EXTRA_COMPONENT_DIRS path/to/components path/to/more/components)
The following is not correct:
set(EXTRA_COMPONENT_DIRS "${EXTRA_COMPONENT_DIRS} component1")
set(EXTRA_COMPONENT_DIRS "${EXTRA_COMPONENT_DIRS} component2")
The string "component1 component2" may indicate a single directory
name with a space, or two directory names separated by space.
However due to the fact that such way of defining EXTRA_COMPONENT_DIRS
was supported in IDF 4.3 and earlier, we need to provide backward
compatibility for it.
This commit introduces a new script, split_paths_by_spaces.py, which
is invoked if EXTRA_COMPONENT_DIRS or COMPONENT_DIRS variable contains
spaces. The script tries to determine if each space should be
interpreted as a separator or as part of the directory name.
When this cannot be done unambiguously, the script reports an error.
In all cases when space separators are detected, the script reports
a warning, and prints instructions for fixing the CMakeLists.txt.
Breaking change in this commit: specifying non-existent directories
in COMPONENT_DIRS or EXTRA_COMPONENT_DIRS is no longer allowed.
Defining CMake variables from the command-line or from another CMake project,
such as `-DCMAKE_C_FLAGS= -DCMAKE_CXX_FLAGS=`, caused a link failure as ESP
CMake was unable to set its proper compilation flags.
Additional CMake compiler flags can now be provided by another project.
* Closes https://github.com/espressif/esp-idf/issues/7507
!4452 used setting LINK_LIBRARIES and INTERFACE_LINK_LIBRARIES to link
components built under ESP-IDF build system. However, LINK_LIBRARIES does
not produce behavior same as linking PRIVATE. This MR uses the new
signature for target_link_libraries directly instead. This also moves
setting dependencies during component registration rather than after all
components have been processed.
The consequence is that internally, components have to use the new
signature form as well. This does not affect linking the components to
external targets, such as with idf_as_lib example. This only affects
linking additional libraries to ESP-IDF libraries outside component processing (after
idf_build_process), which is not even possible for CMake<v3.13 as
target_link_libraries is not valid for targets not created in current
directory. See https://cmake.org/cmake/help/v3.13/policy/CMP0079.html#policy:CMP0079
Previously ldgen determines the output file name on its own. This commit
makes it so that user can dictate what the output file name will be
for the processed template, if the user needs it for something else.
Previously, this compiler flag was not being applied
regardless of CONFIG_SPIRAM_CACHE_WORKAROUND setting.
Explanation: add_compile_options() only applies to
source files added after the function is run, or in
subdirectories added after the function is run. In
this case, no new source files were being added after
this function was run.
* Philosophical: "explicit is better than implicit".
* Practical: Allows useful errors if invalid directories given in components as the defaults aren't
always used. Also trims the -I path from a number of components that have no actual include
directory.
* Simplifies knowing which components will be header-only and which won't
