Merge branch 'FindCurses-include-CheckLibraryExists' into release
Merge branch 'doc-add_compile_options' into release
extend the testing for version comparison

This now checks also the negative outcome of the comparision operation, and
adds a bunch more different cases.
CheckStructHasMember: Avoid clang -Wall breakage (#15203)

With CMAKE_C_COMPILER=clang and CMAKE_C_FLAGS='-Wall -Werror', this test
breaks with -Werror,-Wuninitialized.  Fix this by getting rid of the
temporary variable.
Documentation: Fix minor typo thecommand -> the command
cmSystemTools: reimplement verson comparison without sscanf()

This now has the advantage that it works with version strings with any number
of components.
Tests/Tutorial: Fix when USE_MYMATH is OFF

Unit tests for the square root of "-25" currently fail when USE_MYMATH
is disabled. The "mysqrt" method in the tutorials, returns "0" for a
negative value, while "sqrt" returns "NaN", and therefore the output is
not accepted by the test.

This patch checks if the number is negative and eventually returns "0"
before calling "sqrt" or "mysqrt" to fix this issue.

Printing a NaN might cause issues with the string catched by the tests
on some platform. Therefore assume that "0" is correct and "fix" the
USE_MYMATH=OFF version by checking if the number is negative and
eventually returning "0" before calling "sqrt" or "mysqrt".
ExternalProject: Add CMAKE_CACHE_DEFAULT_ARGS arguments

This argument allows to set default arguments that are written in the
initial cache file, but that are not forced, and therefore allows the
user to change these values later (CMAKE_ARGS and CMAKE_CACHE_ARGS
always overwrite the values).

Also add some documentation to explain the differences between these 3
arguments.

Extend ExternalProjectLocal test to cover CMAKE_CACHE_DEFAULT_ARGS.
ExternalProject: Add unit tests for CMAKE_CACHE_DEFAULT_ARGS
Merge topic 'doc-add_library-typo'

38825396 Documentation: Fix minor typo thecommand -> the command
Merge topic 'CheckStructHasMember-avoid-breakage-on-Wall'

8d6ba358 CheckStructHasMember: Avoid clang -Wall breakage (#15203)
Merge topic 'VERSION_no_sscanf'

ef09df64 cmSystemTools: reimplement verson comparison without sscanf()
667560c8 extend the testing for version comparison
Merge topic 'ExternalProject_CMAKE_CACHE_DEFAULT_ARGS'

609037f4 ExternalProject: Add unit tests for CMAKE_CACHE_DEFAULT_ARGS
98cdb658 ExternalProject: Add CMAKE_CACHE_DEFAULT_ARGS arguments
36cf8a1e Tests/Tutorial: Fix when USE_MYMATH is OFF
Merge branch 'doc-add_library-typo' into release
Merge branch 'release'