From 806ebcb36b881a0a9ac42125c8eab23abb9bb16b Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sun, 26 Sep 2021 12:49:20 -0400
Subject: m4/ax_cflags_warn_all.m4: Update from Autoconf Archive

20ea11b Trivial cosmetic to make the generator happy.
86b513d ax_cflags_warn_all.m4: Avoid prepending empty flags
bfc41a8 ax_cflags_warn_all.m4: Prepend flags instead of appending them
fc51f04 ax_cflags_warn_all.m4: Bug fix: modern Intel compilers don't accept "-warn all"
9000a82 ax_cflags_warn_all.m4: Bug fix: the PGI compilers do not understand "-Wall"
3d68321 ax_cflags_warn_all.m4: Rewrite the documentation to provide greater clarity
e13932a ax_cflags_warn_all.m4: Nicely indent remaining macros
b259e09 ax_cflags_warn_all.m4: Rewrite AX_FLAGS_WARN_ALL to use AX_COMPILER_VENDOR
8388e03 ax_cflags_warn_all.m4: Bump version number and add new copyright holder
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