From c056144ac23fe9bc325ac235b4651e57b41bc8dc Mon Sep 17 00:00:00 2001
From: Guillem Jover <guillem@hadrons.org>
Date: Sun, 12 Apr 2020 04:01:27 +0200
Subject: [PATCH] [PATCH libaio 11/11] build: Honour user build flags

CPPFLAGS, CFLAGS and LDFLAGS are user flags, which we need to preserve.
Any required flag that the build system needs, has to be set in some
other flag so that the build will succeed even if the user flags are
passed.

Signed-off-by: Guillem Jover <guillem@hadrons.org>

Gbp-Pq: Name 0011-build-Honour-user-build-flags.patch
---
 harness/Makefile |  7 +++++--
 src/Makefile     | 18 +++++++++---------
 2 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/harness/Makefile b/harness/Makefile
index 403eb73..fc129ca 100644
--- a/harness/Makefile
+++ b/harness/Makefile
@@ -6,8 +6,11 @@ PROGS:=$(PARTPROGS) $(EXTRAPROGS)
 HARNESS_SRCS:=main.c
 # io_queue.c
 
-CFLAGS+=-Wall -I../src -g -O2
+MK_CPPFLAGS := -I../src $(CPPFLAGS)
+CFLAGS = -Wall -g -O2
 #-lpthread -lrt
+MK_CFLAGS = $(CFLAGS)
+MK_LDFLAGS = main.c $(LIBAIO) -lpthread $(LDFLAGS)
 
 # gcc-11 does not like the test case in 3.t that
 # passes an invalid pointer (-1) to the kernel, so
@@ -21,7 +24,7 @@ LIBAIO?=../src/libaio.a
 all: $(PROGS)
 
 $(PROGS): %.p: %.t $(HARNESS_SRCS)
-	$(CC) $(CFLAGS) -DTEST_NAME=\"$<\" -o $@ main.c $(LIBAIO) -lpthread
+	$(CC) $(MK_CPPFLAGS) $(MK_CFLAGS) -DTEST_NAME=\"$<\" -o $@ $(MK_LDFLAGS)
 
 clean:
 	rm -f $(PROGS) *.o runtests.out rofile wofile rwfile
diff --git a/src/Makefile b/src/Makefile
index a53c43c..f6215f9 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3,12 +3,12 @@ prefix=/usr
 includedir=$(prefix)/include
 libdir=$(prefix)/lib
 
-CFLAGS ?= -g -fomit-frame-pointer -O2
-CFLAGS += -Wall -I. -fPIC
-SO_CFLAGS=-shared $(CFLAGS)
-L_CFLAGS=$(CFLAGS)
-LINK_FLAGS=
-LINK_FLAGS+=$(LDFLAGS)
+MK_CPPFLAGS = -I.
+MK_CFLAGS = -fPIC $(CFLAGS)
+CFLAGS = -Wall -g -fomit-frame-pointer -O2
+SO_CFLAGS = -shared $(MK_CFLAGS)
+L_CFLAGS = $(MK_CFLAGS)
+MK_LDFLAGS = $(LDFLAGS)
 ENABLE_SHARED ?= 1
 
 soname=libaio.so.1
@@ -43,10 +43,10 @@ libaio_sobjs := $(patsubst %.c,%.os,$(libaio_srcs))
 $(libaio_objs) $(libaio_sobjs): libaio.h vsys_def.h
 
 %.os: %.c
-	$(CC) $(SO_CFLAGS) -c -o $@ $<
+	$(CC) $(MK_CPPFLAGS) $(SO_CFLAGS) -c -o $@ $<
 
 %.ol: %.c
-	$(CC) $(L_CFLAGS) -c -o $@ $<
+	$(CC) $(MK_CPPFLAGS) $(L_CFLAGS) -c -o $@ $<
 
 AR ?= ar
 RANLIB ?= ranlib
@@ -56,7 +56,7 @@ libaio.a: $(libaio_objs)
 	$(RANLIB) libaio.a
 
 $(libname): $(libaio_sobjs) libaio.map
-	$(CC) $(SO_CFLAGS) -Wl,--version-script=libaio.map -Wl,-soname=$(soname) -o $@ $(libaio_sobjs) $(LINK_FLAGS)
+	$(CC) $(SO_CFLAGS) -Wl,--version-script=libaio.map -Wl,-soname=$(soname) -o $@ $(libaio_sobjs) $(MK_LDFLAGS)
 
 install: $(all_targets)
 	install -D -m 644 libaio.h $(DESTDIR)$(includedir)/libaio.h
-- 
2.30.2