From 616db3e80ca4d49c138f2f9db49b3b81b40c4504 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Fri, 29 Dec 2023 20:34:38 -0500
Subject: [PATCH] libgloss: add per-file & per-dir flag support

This logic is copied from what's used in newlib today.  This allows
subdirs to easily define per-directory flags & per-file flags without
having to setup unique automake rules for each one.
---
 libgloss/Makefile.am | 6 +++++-
 libgloss/Makefile.in | 7 ++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/libgloss/Makefile.am b/libgloss/Makefile.am
index aa1c430e3..9d6988ace 100644
--- a/libgloss/Makefile.am
+++ b/libgloss/Makefile.am
@@ -24,7 +24,11 @@ includetool_DATA =
 includesystooldir = $(tooldir)/include/sys
 includesystool_DATA =
 
-AM_CPPFLAGS = -idirafter $(srcroot)/include
+# These are useful for standalone object files like crt0.o.
+AM_CFLAGS = $(AM_CFLAGS_$(subst /,_,$(@D))) $(AM_CFLAGS_$(subst /,_,$(@D)_$(<F)))
+AM_CCASFLAGS = $(AM_CCASFLAGS_$(subst /,_,$(@D))) $(AM_CCASFLAGS_$(subst /,_,$(@D)_$(<F)))
+AM_CPPFLAGS = $(AM_CPPFLAGS_$(subst /,_,$(@D))) $(AM_CPPFLAGS_$(subst /,_,$(@D)_$(<F))) -idirafter $(srcroot)/include
+AM_LDFLAGS = $(AM_LDFLAGS_$(subst /,_,$(@D))) $(AM_LDFLAGS_$(subst -,_,$(subst /,_,$(@D)_$(@F))))
 
 # A fake library so automake will generate rules for plain objects that we want
 # to install (e.g. our crt0.o objects).
diff --git a/libgloss/Makefile.in b/libgloss/Makefile.in
index e6441a4c5..2574c7021 100644
--- a/libgloss/Makefile.in
+++ b/libgloss/Makefile.in
@@ -913,7 +913,12 @@ includetooldir = $(tooldir)/include
 includetool_DATA = $(am__append_16)
 includesystooldir = $(tooldir)/include/sys
 includesystool_DATA = $(am__append_17)
-AM_CPPFLAGS = -idirafter $(srcroot)/include
+
+# These are useful for standalone object files like crt0.o.
+AM_CFLAGS = $(AM_CFLAGS_$(subst /,_,$(@D))) $(AM_CFLAGS_$(subst /,_,$(@D)_$(<F)))
+AM_CCASFLAGS = $(AM_CCASFLAGS_$(subst /,_,$(@D))) $(AM_CCASFLAGS_$(subst /,_,$(@D)_$(<F)))
+AM_CPPFLAGS = $(AM_CPPFLAGS_$(subst /,_,$(@D))) $(AM_CPPFLAGS_$(subst /,_,$(@D)_$(<F))) -idirafter $(srcroot)/include
+AM_LDFLAGS = $(AM_LDFLAGS_$(subst /,_,$(@D))) $(AM_LDFLAGS_$(subst -,_,$(subst /,_,$(@D)_$(@F))))
 
 # A fake library so automake will generate rules for plain objects that we want
 # to install (e.g. our crt0.o objects).