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Re: [Qemu-devel] [PATCH v1 1/2] Makefile: Remove libqemustub.a


From: Philippe Mathieu-Daudé
Subject: Re: [Qemu-devel] [PATCH v1 1/2] Makefile: Remove libqemustub.a
Date: Fri, 18 Aug 2017 16:29:56 -0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1

Hi Alistair,

On 08/18/2017 03:47 PM, Alistair Francis wrote:
Using two libraries (libqemuutil.a and libqemustub.a) would sometimes
result in circular dependencies. To avoid these issues let's just
combine both into a single library that functions as both.

Signed-off-by: Alistair Francis <address@hidden>
---

  Makefile                    |  7 +++----
  Makefile.target             |  2 +-
  docs/devel/build-system.txt | 14 +++++---------
  tests/Makefile.include      |  6 +++---
  4 files changed, 12 insertions(+), 17 deletions(-)

diff --git a/Makefile b/Makefile
index 81447b1f08..f111e93c63 100644
--- a/Makefile
+++ b/Makefile
@@ -344,7 +344,7 @@ subdir-dtc:dtc/libfdt dtc/tests
  dtc/%:
        mkdir -p $@
-$(SUBDIR_RULES): libqemuutil.a libqemustub.a $(common-obj-y) $(chardev-obj-y) \
+$(SUBDIR_RULES): libqemuutil.a $(common-obj-y) $(chardev-obj-y) \
        $(qom-obj-y) $(crypto-aes-obj-$(CONFIG_USER_ONLY))
ROMSUBDIR_RULES=$(patsubst %,romsubdir-%, $(ROMS))
@@ -364,12 +364,11 @@ Makefile: $(version-obj-y)
  ######################################################################
  # Build libraries
-libqemustub.a: $(stub-obj-y)
-libqemuutil.a: $(util-obj-y) $(trace-obj-y)
+libqemuutil.a: $(util-obj-y) $(trace-obj-y) $(stub-obj-y)
###################################################################### -COMMON_LDADDS = libqemuutil.a libqemustub.a
+COMMON_LDADDS = libqemuutil.a
qemu-img.o: qemu-img-cmds.h diff --git a/Makefile.target b/Makefile.target
index 7f42c45db8..0a80caf79c 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -193,7 +193,7 @@ all-obj-$(CONFIG_SOFTMMU) += $(io-obj-y)
$(QEMU_PROG_BUILD): config-devices.mak -COMMON_LDADDS = ../libqemuutil.a ../libqemustub.a
+COMMON_LDADDS = ../libqemuutil.a
# build either PROG or PROGW
  $(QEMU_PROG_BUILD): $(all-obj-y) $(COMMON_LDADDS)
diff --git a/docs/devel/build-system.txt b/docs/devel/build-system.txt
index 2af1e668c5..5f32e53248 100644
--- a/docs/devel/build-system.txt
+++ b/docs/devel/build-system.txt
@@ -232,15 +232,11 @@ The utility code that is used by all binaries is built 
into a
  static archive called libqemuutil.a, which is then linked to all the
  binaries. In order to provide hooks that are only needed by some of the
  binaries, code in libqemuutil.a may depend on other functions that are
-not fully implemented by all QEMU binaries. To deal with this there is a
-second library called libqemustub.a which provides dummy stubs for all
-these functions. These will get lazy linked into the binary if the real
-implementation is not present. In this way, the libqemustub.a static
-library can be thought of as a portable implementation of the weak
-symbols concept. All binaries should link to both libqemuutil.a and
-libqemustub.a. e.g.
-
- qemu-img$(EXESUF): qemu-img.o ..snip.. libqemuutil.a libqemustub.a
+not fully implemented by all QEMU binaries. To deal with this there are
+dummy stubs for all these functions in libqemuutil.a.
+All binaries should link to both libqemuutil.a and libqemustub.a. e.g.

still libqemustub.a

+
+ qemu-img$(EXESUF): qemu-img.o ..snip.. libqemuutil.a

changed a bit:

The utility code that is used by all binaries is built into a
static archive called libqemuutil.a, which is then linked to all the
binaries. In order to provide hooks that are only needed by some of the
binaries, code in libqemuutil.a may depend on other functions that are
not fully implemented by all QEMU binaries. Dummy stubs for all  these
functions are also provided by this library, and will get lazy linked
into the binary if the real implementation is not present. In this way,
this static library can be thought of as a portable implementation of
the weak symbols concept. All binaries should link to libqemuutil.a. e.g.

 qemu-img$(EXESUF): qemu-img.o ..snip.. libqemuutil.a

This or removing "libqemustub.a":
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

  Windows platform portability
diff --git a/tests/Makefile.include b/tests/Makefile.include
index 37c1bed683..80527a8763 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -553,7 +553,7 @@ QEMU_CFLAGS += -I$(SRC_PATH)/tests
# Deps that are common to various different sets of tests below
-test-util-obj-y = libqemuutil.a libqemustub.a
+test-util-obj-y = libqemuutil.a
  test-qom-obj-y = $(qom-obj-y) $(test-util-obj-y)
  test-qapi-obj-y = tests/test-qapi-visit.o tests/test-qapi-types.o \
        tests/test-qapi-event.o tests/test-qmp-introspect.o \
@@ -608,8 +608,8 @@ tests/test-vmstate$(EXESUF): tests/test-vmstate.o \
        $(test-io-obj-y)
  tests/test-timed-average$(EXESUF): tests/test-timed-average.o 
$(test-util-obj-y)
  tests/test-base64$(EXESUF): tests/test-base64.o \
-       libqemuutil.a libqemustub.a
-tests/ptimer-test$(EXESUF): tests/ptimer-test.o tests/ptimer-test-stubs.o 
hw/core/ptimer.o libqemustub.a
+       libqemuutil.a
+tests/ptimer-test$(EXESUF): tests/ptimer-test.o tests/ptimer-test-stubs.o 
hw/core/ptimer.o $(test-util-obj-y)
tests/test-logging$(EXESUF): tests/test-logging.o $(test-util-obj-y)



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