In commit v3.2.0-rc1~272^2~2 (Makefile: Fix rebuild with multiple custom
command outputs, 2014-12-05) we changed the generated makefile pattern
for multiple outputs from
out1: depends...
commands...
out2: out1
to
out1 out2: depends...
commands...
This was based on the incorrect assumption that make tools would treat
this as a combined output rule and run the command(s) exactly once for
them. It turns out that instead this new pattern is equivalent to
out1: depends...
commands...
out2: depends...
commands...
so the commands may be run more than once.
Some documents suggest using a "dedicated witness" stamp file:
stamp: depends...
rm -f stamp
touch stamp.tmp
commands...
mv stamp.tmp stamp
out1 out2: stamp
However, if the commands fail the error message will refer to the stamp
instead of any of the real outputs, which may be confusing to readers.
Also, this approach seems to have the same behavior of the original
approach that motiviated the above commit: multiple invocations are
needed to bring consumers of the outputs up to date.
Instead we can return to the original approach but add an explicit
touch to each extra output rule:
out1: depends...
commands...
out2: out1
touch -c out2
This causes make tools to recognize that all outputs have changed and
therefore to execute any commands that consume them.
Given a rule of the form
out1 out2: dep1
out1 out2: dep2
Borland Make complains that there are multiple rules for "out1"
even though this works when there is only one output. Instead
generate
out1 out2: dep1 dep2
for Borland Make, but only when there are multiple outputs.
This converts the CMake license to a pure 3-clause OSI-approved BSD
License. We drop the previous license clause requiring modified
versions to be plainly marked. We also update the CMake copyright to
cover the full development time range.
something like this:
ENABLE_LANGUAGE(ASM-ATT)
IF(CMAKE_ASM-ATT_COMPILER_WORKS)
... do assembler stufff
ELSE(CMAKE_ASM-ATT_COMPILER_WORKS)
... fallback to generic C/C++
ENDIF(CMAKE_ASM-ATT_COMPILER_WORKS)
Alex
Brad King
Patrick Gansterer
Kitware Robot
Ken Martin
Alexander Neundorf
Bill Hoffman