[cmake-developers] CMAKE_C_COMPILER_ARG# not documented?

[Robert Dailey]

I can't remember where I heard about these CMake variables, but in one
of my toolchain files I do this:

set( CMAKE_C_COMPILER_ARG1 -m32 )
set( CMAKE_CXX_COMPILER_ARG1 -m32 )

On the [cmake variables][1] page, these are not documented. I expected
an entry somewhere like `CMAKE_<LANG>_COMPILER_ARG<#>` but there isn't
one. Are these documented? If so, where? If not, I'll create an issue
on the gitlab project page to make sure that gets done at some point.
I would offer to do it but I'm not too sure what the variables do
myself, nor am I sure what the upper limit for ARG is.

[1]: https://cmake.org/cmake/help/latest/manual/cmake-variables.7.html
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[Brad King]

Post by Robert Dailey
I can't remember where I heard about these CMake variables, but in one
set( CMAKE_C_COMPILER_ARG1 -m32 )
set( CMAKE_CXX_COMPILER_ARG1 -m32 )

They are not documented because they are internal implementation
details. Projects should not be setting them.

-Brad
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[Robert Dailey]

Post by Brad King

Post by Robert Dailey
I can't remember where I heard about these CMake variables, but in one
set( CMAKE_C_COMPILER_ARG1 -m32 )
set( CMAKE_CXX_COMPILER_ARG1 -m32 )

They are not documented because they are internal implementation
details. Projects should not be setting them.

I think this was recommended to me because `-m32` had to be the first
argument to clang. I'll try to dig up the conversation, I forgot who
recommended it and why.
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[Robert Dailey]

Post by Robert Dailey

Post by Brad King

Post by Robert Dailey
I can't remember where I heard about these CMake variables, but in one
set( CMAKE_C_COMPILER_ARG1 -m32 )
set( CMAKE_CXX_COMPILER_ARG1 -m32 )

They are not documented because they are internal implementation
details. Projects should not be setting them.

I think this was recommended to me because `-m32` had to be the first
argument to clang. I'll try to dig up the conversation, I forgot who
recommended it and why.

Found it:
https://cmake.org/pipermail/cmake/2013-March/054161.html

Looks like something Bill Hoffman suggested years ago. I still don't
remember why I started using it, it was definitely to work around some
sort of issue. What is the proper, public API solution that gives
identical functionality? Should I be using `CMAKE_C_COMPILER` instead,
and appending to it as a string from my toolchain file?

Thanks in advance.
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[Robert Dailey]

Post by Robert Dailey

Post by Robert Dailey

Post by Brad King

Post by Robert Dailey
I can't remember where I heard about these CMake variables, but in one
set( CMAKE_C_COMPILER_ARG1 -m32 )
set( CMAKE_CXX_COMPILER_ARG1 -m32 )

They are not documented because they are internal implementation
details. Projects should not be setting them.

I think this was recommended to me because `-m32` had to be the first
argument to clang. I'll try to dig up the conversation, I forgot who
recommended it and why.

https://cmake.org/pipermail/cmake/2013-March/054161.html
Looks like something Bill Hoffman suggested years ago. I still don't
remember why I started using it, it was definitely to work around some
sort of issue. What is the proper, public API solution that gives
identical functionality? Should I be using `CMAKE_C_COMPILER` instead,
and appending to it as a string from my toolchain file?
Thanks in advance.

Looking at the docs a bit closer, it seems like this is the better solution:

set( CMAKE_C_FLAGS_INIT -m32 )
set( CMAKE_CXX_FLAGS_INIT -m32 )

Not sure if you'd agree, but at least I can verify it is working.
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