Re: [PATCH] Update configure.ac so that we don't need glibc when running ./configure.

[Samuel Thibault]

Flavio Cruz, le dim. 08 janv. 2023 21:49:40 -0500, a ecrit:
> For x86_64-pc-gnu we still do not have a working glibc so ./configure will 
> fail
> under a freestanding environment. We force ./configure to avoid running
> compiled C programs as a test which it is not needed when compiling a kernel.
> ---
>  configure.ac | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/configure.ac b/configure.ac
> index 3aaa935c..06a243a2 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -21,6 +21,9 @@ AC_INIT([AC_PACKAGE_NAME], [AC_PACKAGE_VERSION], 
> [AC_PACKAGE_BUGREPORT],
>    [AC_PACKAGE_TARNAME])
>  AC_CONFIG_SRCDIR([kern/ipc_kobject.c])
>  
> +# We don't need glibc to compile gnumach.
> +: ${CFLAGS="-ffreestanding -nostdlib"}

AIUI we can then drop these from Makefile.am?
(better not duplicate flags, that most often leads to cargo cult).

>  AC_CONFIG_AUX_DIR([build-aux])
>  
>  AM_INIT_AUTOMAKE(
> @@ -79,7 +82,12 @@ AC_SUBST([systype])
>  #
>  
>  AC_PROG_AWK
> +# Temporarily force cross compiling mode to make sure the configure script
> +# does not try to run compiled binaries.
> +save_cross_compiling=$cross_compiling
> +cross_compiling=yes
>  AM_PROG_AS
> +cross_compiling=$save_cross_compiling
>  AC_PROG_CC
>  AC_PROG_CPP
>  AC_PROG_INSTALL
> -- 
> 2.39.0
> 
>