CVS commit: src/tools/compat

["Luke Mewburn" <lukem%netbsd.org@localhost>]

Module Name:    src
Committed By:   lukem
Date:           Thu Jul 20 15:15:23 UTC 2023

Modified Files:
        src/tools/compat: configure.ac
Added Files:
        src/tools/compat/buildaux: nb_check_cc_flag.m4

Log Message:
tools/compat: provide nb_check_cc_flag.m4

Implement m4 macro NB_CHECK_CC_FLAG(FLAG, [VAR=FLAG_DERIVED])
        Determine if the C compiler supports FLAG,
        and sets output variable VAR to FLAG if FLAG is supported.

        If VAR is not provided, default to FLAG_DERIVED, which is
        FLAG converted to upper-case and all special characters
        replaced with "_", and the result prepended with "CC_".
        FLAG_DERIVED is appended to the m4 macro NB_CHECK_CC_FLAG_VARS.
        E.g., if FLAG is "-Wexample=yes", FLAG_DERIVED is "CC_WEXAMPLE_YES".

This is implemented in separate buildaux/nb_check_cc_flag.m4,
based on configure's NB_CC_FLAG(), but supports VAR override.

Adapt configure from internal NB_CC_FLAG() to NB_CHECK_CC_FLAG().

(Note: AX_CHECK_COMPILE_FLAG() from autoconf-archive could be enhanced
to support the clang and gcc workarounds I've implemented here.)


To generate a diff of this commit:
cvs rdiff -u -r1.105 -r1.106 src/tools/compat/configure.ac
cvs rdiff -u -r0 -r1.1 src/tools/compat/buildaux/nb_check_cc_flag.m4

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.