[PATCH v2 0/4] Compatibility make fixes for meson

[PATCH v2 0/4] Compatibility make fixes for meson

[Roman Bolshakov]

The set of changes addresses "Diagnose "make is too old" in configure
(or in the makefile?)" from https://wiki.qemu.org/Features/Meson#Easy.
It also provides cleaner backwards compatible build invocation on macOS.

Changes since v1:
 - Added explicit error for partially-completed configure (Eric B.)
 - Added an empty rule for config-host.mak to avoid second call of
   recursive make (which happened because of implicit force rule)

Roman Bolshakov (4):
  configure: Use discovered make for in-source build
  Makefile: Require GNU make 3.82+
  configure: Prefer gmake on darwin
  configure: Test if $make actually exists

 Makefile  |  5 +++++
 configure | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+)

-- 
2.28.0

[PATCH v2 1/4] configure: Use discovered make for in-source build

[Roman Bolshakov]

A recursive make is invoked if in-source build is used but $(MAKE) is
the same as the one used in the original make invocation.

Some platforms have preference to use gmake, or a make passed as an
option to "configure". Honor the choice.

Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
---
 configure | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure b/configure
index b1e11397a8..07732bf011 100755
--- a/configure
+++ b/configure
@@ -38,6 +38,11 @@ then
 # This file is auto-generated by configure to support in-source tree
 # 'make' command invocation
 
+ifeq ($(wildcard build/config-host.mak),)
+$(error Incomplete configuration. Please run `configure`)
+endif
+include build/config-host.mak
+
 ifeq ($(MAKECMDGOALS),)
 recurse: all
 endif
@@ -54,6 +59,7 @@ endif
 force: ;
 .PHONY: force
 GNUmakefile: ;
+build/config-host.mak: ;
 
 EOF
     cd build
-- 
2.28.0

[PATCH v2 2/4] Makefile: Require GNU make 3.82+

[Roman Bolshakov]

QEMU build fails with cryptic messages if make is too old:

  Makefile.ninja:2655: *** multiple target patterns.  Stop.

To avoid the confusion it's worth to fail the build right away and print
a friendly error message.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
---
 Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Makefile b/Makefile
index 81794d5c34..b4ebf3e30f 100644
--- a/Makefile
+++ b/Makefile
@@ -4,6 +4,11 @@ ifneq ($(words $(subst :, ,$(CURDIR))), 1)
   $(error main directory cannot contain spaces nor colons)
 endif
 
+ifeq ($(filter undefine,$(value .FEATURES)),)
+$(error Unsupported Make version: $(MAKE_VERSION). \
+        Please use GNU Make 3.82 or above)
+endif
+
 # Always point to the root of the build tree (needs GNU make).
 BUILD_DIR=$(CURDIR)
 
-- 
2.28.0

[PATCH v2 3/4] configure: Prefer gmake on darwin

[Roman Bolshakov]

New meson/make build requires GNU make 3.82+ but macOS ships 3.81 even
on Big Sur while homebrew provides GNU make 4.3 as 'gmake' in $PATH.

With the change, 'make' switches over to gmake implicitly.

Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
---
 configure | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/configure b/configure
index 07732bf011..664084992b 100755
--- a/configure
+++ b/configure
@@ -907,6 +907,7 @@ Darwin)
   darwin="yes"
   hax="yes"
   hvf="yes"
+  make="${MAKE-gmake}"
   LDFLAGS_SHARED="-bundle -undefined dynamic_lookup"
   if [ "$cpu" = "x86_64" ] ; then
     QEMU_CFLAGS="-arch x86_64 $QEMU_CFLAGS"
@@ -920,6 +921,31 @@ Darwin)
   # won't work when we're compiling with gcc as a C compiler.
   QEMU_CFLAGS="-DOS_OBJECT_USE_OBJC=0 $QEMU_CFLAGS"
   HOST_VARIANT_DIR="darwin"
+  cat > GNUmakefile <<'EOF'
+# This file is auto-generated by configure to implicitly switch from a 'make'
+# invocation to 'gmake'
+
+OLD_MAKE := $(MAKE)
+
+ifeq ($(wildcard config-host.mak),)
+$(error Incomplete configuration. Please run `configure`)
+endif
+include config-host.mak
+
+ifeq ($(MAKECMDGOALS),)
+recurse: all
+endif
+
+.NOTPARALLEL: %
+%: force
+	@echo 'Switch from $(OLD_MAKE) to $(MAKE)'
+	@$(MAKE) -f Makefile $(MAKECMDGOALS)
+force: ;
+.PHONY: force
+GNUmakefile: ;
+config-host.mak: ;
+
+EOF
 ;;
 SunOS)
   solaris="yes"
-- 
2.28.0

[PATCH v2 4/4] configure: Test if $make actually exists

[Roman Bolshakov]

configure doesn't detect if $make is installed on the build host.
This is also helpful for hosts where an alias for make is used, i.e.
configure would fail if gmake is not present on macOS.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
---
 configure | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/configure b/configure
index 664084992b..9230832da2 100755
--- a/configure
+++ b/configure
@@ -2029,6 +2029,10 @@ if test -z "$python"
 then
     error_exit "Python not found. Use --python=/path/to/python"
 fi
+if ! has "$make"
+then
+    error_exit "GNU make ($make) not found"
+fi
 
 # Note that if the Python conditional here evaluates True we will exit
 # with status 1 which is a shell 'false' value.
-- 
2.28.0

Re: [PATCH v2 2/4] Makefile: Require GNU make 3.82+

[Thomas Huth]

On 25/08/2020 22.27, Roman Bolshakov wrote:
> QEMU build fails with cryptic messages if make is too old:
> 
>   Makefile.ninja:2655: *** multiple target patterns.  Stop.
> 
> To avoid the confusion it's worth to fail the build right away and print
> a friendly error message.
> 
> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
> Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
> ---
>  Makefile | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Makefile b/Makefile
> index 81794d5c34..b4ebf3e30f 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -4,6 +4,11 @@ ifneq ($(words $(subst :, ,$(CURDIR))), 1)
>    $(error main directory cannot contain spaces nor colons)
>  endif
>  
> +ifeq ($(filter undefine,$(value .FEATURES)),)
> +$(error Unsupported Make version: $(MAKE_VERSION). \
> +        Please use GNU Make 3.82 or above)
> +endif
> +
>  # Always point to the root of the build tree (needs GNU make).
>  BUILD_DIR=$(CURDIR)

Reviewed-by: Thomas Huth <thuth@redhat.com>

Re: [PATCH v2 4/4] configure: Test if $make actually exists

[Thomas Huth]

On 25/08/2020 22.27, Roman Bolshakov wrote:
> configure doesn't detect if $make is installed on the build host.
> This is also helpful for hosts where an alias for make is used, i.e.
> configure would fail if gmake is not present on macOS.
> 
> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
> Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
> ---
>  configure | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/configure b/configure
> index 664084992b..9230832da2 100755
> --- a/configure
> +++ b/configure
> @@ -2029,6 +2029,10 @@ if test -z "$python"
>  then
>      error_exit "Python not found. Use --python=/path/to/python"
>  fi
> +if ! has "$make"
> +then
> +    error_exit "GNU make ($make) not found"
> +fi
>  
>  # Note that if the Python conditional here evaluates True we will exit
>  # with status 1 which is a shell 'false' value.
> 

Reviewed-by: Thomas Huth <thuth@redhat.com>

Re: [PATCH v2 2/4] Makefile: Require GNU make 3.82+

[Laurent Vivier]

Le 12/10/2020 à 11:47, Thomas Huth a écrit :
> On 25/08/2020 22.27, Roman Bolshakov wrote:
>> QEMU build fails with cryptic messages if make is too old:
>>
>>   Makefile.ninja:2655: *** multiple target patterns.  Stop.
>>
>> To avoid the confusion it's worth to fail the build right away and print
>> a friendly error message.
>>
>> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
>> Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
>> ---
>>  Makefile | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/Makefile b/Makefile
>> index 81794d5c34..b4ebf3e30f 100644
>> --- a/Makefile
>> +++ b/Makefile
>> @@ -4,6 +4,11 @@ ifneq ($(words $(subst :, ,$(CURDIR))), 1)
>>    $(error main directory cannot contain spaces nor colons)
>>  endif
>>  
>> +ifeq ($(filter undefine,$(value .FEATURES)),)
>> +$(error Unsupported Make version: $(MAKE_VERSION). \
>> +        Please use GNU Make 3.82 or above)
>> +endif
>> +
>>  # Always point to the root of the build tree (needs GNU make).
>>  BUILD_DIR=$(CURDIR)
> 
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> 
> 

Applied to my trivial-patches branch.

Thanks,
Laurent

Re: [PATCH v2 4/4] configure: Test if $make actually exists

[Laurent Vivier]

Le 12/10/2020 à 11:49, Thomas Huth a écrit :
> On 25/08/2020 22.27, Roman Bolshakov wrote:
>> configure doesn't detect if $make is installed on the build host.
>> This is also helpful for hosts where an alias for make is used, i.e.
>> configure would fail if gmake is not present on macOS.
>>
>> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
>> Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
>> ---
>>  configure | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/configure b/configure
>> index 664084992b..9230832da2 100755
>> --- a/configure
>> +++ b/configure
>> @@ -2029,6 +2029,10 @@ if test -z "$python"
>>  then
>>      error_exit "Python not found. Use --python=/path/to/python"
>>  fi
>> +if ! has "$make"
>> +then
>> +    error_exit "GNU make ($make) not found"
>> +fi
>>  
>>  # Note that if the Python conditional here evaluates True we will exit
>>  # with status 1 which is a shell 'false' value.
>>
> 
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> 
> 

Applied to my trivial-patches branch.

Thanks,
Laurent

Re: [PATCH v2 2/4] Makefile: Require GNU make 3.82+

[Peter Maydell]

On Sun, 13 Dec 2020 at 17:22, Laurent Vivier <laurent@vivier.eu> wrote:
>
> Le 12/10/2020 à 11:47, Thomas Huth a écrit :
> > On 25/08/2020 22.27, Roman Bolshakov wrote:
> >> QEMU build fails with cryptic messages if make is too old:
> >>
> >>   Makefile.ninja:2655: *** multiple target patterns.  Stop.
> >>
> >> To avoid the confusion it's worth to fail the build right away and print
> >> a friendly error message.
> >>
> >> +ifeq ($(filter undefine,$(value .FEATURES)),)
> >> +$(error Unsupported Make version: $(MAKE_VERSION). \
> >> +        Please use GNU Make 3.82 or above)
> >> +endif
> >> +
> >>  # Always point to the root of the build tree (needs GNU make).
> >>  BUILD_DIR=$(CURDIR)
> >
> > Reviewed-by: Thomas Huth <thuth@redhat.com>
> >
> >
>
> Applied to my trivial-patches branch.

Commit 09e93326e448ab4 says that the switch to ninja from
ninjatool removed the requirement for Make 3.82. Is this
change still required?

thanks
-- PMM

Re: [PATCH v2 2/4] Makefile: Require GNU make 3.82+

[Laurent Vivier]

Le 13/12/2020 à 20:04, Peter Maydell a écrit :
> On Sun, 13 Dec 2020 at 17:22, Laurent Vivier <laurent@vivier.eu> wrote:
>>
>> Le 12/10/2020 à 11:47, Thomas Huth a écrit :
>>> On 25/08/2020 22.27, Roman Bolshakov wrote:
>>>> QEMU build fails with cryptic messages if make is too old:
>>>>
>>>>   Makefile.ninja:2655: *** multiple target patterns.  Stop.
>>>>
>>>> To avoid the confusion it's worth to fail the build right away and print
>>>> a friendly error message.
>>>>
>>>> +ifeq ($(filter undefine,$(value .FEATURES)),)
>>>> +$(error Unsupported Make version: $(MAKE_VERSION). \
>>>> +        Please use GNU Make 3.82 or above)
>>>> +endif
>>>> +
>>>>  # Always point to the root of the build tree (needs GNU make).
>>>>  BUILD_DIR=$(CURDIR)
>>>
>>> Reviewed-by: Thomas Huth <thuth@redhat.com>
>>>
>>>
>>
>> Applied to my trivial-patches branch.
> 
> Commit 09e93326e448ab4 says that the switch to ninja from
> ninjatool removed the requirement for Make 3.82. Is this
> change still required?
>

It seems 09e93326e448ab4 has been committed on 17th of October, so after Thomas' review.
I remove it from my queue.

Thanks,
Laurent

Re: [PATCH v2 2/4] Makefile: Require GNU make 3.82+

[Roman Bolshakov]

On Sun, Dec 13, 2020 at 11:56:22PM +0100, Laurent Vivier wrote:
> Le 13/12/2020 à 20:04, Peter Maydell a écrit :
> > On Sun, 13 Dec 2020 at 17:22, Laurent Vivier <laurent@vivier.eu> wrote:
> >>
> >> Le 12/10/2020 à 11:47, Thomas Huth a écrit :
> >>> On 25/08/2020 22.27, Roman Bolshakov wrote:
> >>>> QEMU build fails with cryptic messages if make is too old:
> >>>>
> >>>>   Makefile.ninja:2655: *** multiple target patterns.  Stop.
> >>>>
> >>>> To avoid the confusion it's worth to fail the build right away and print
> >>>> a friendly error message.
> >>>>
> >>>> +ifeq ($(filter undefine,$(value .FEATURES)),)
> >>>> +$(error Unsupported Make version: $(MAKE_VERSION). \
> >>>> +        Please use GNU Make 3.82 or above)
> >>>> +endif
> >>>> +
> >>>>  # Always point to the root of the build tree (needs GNU make).
> >>>>  BUILD_DIR=$(CURDIR)
> >>>
> >>> Reviewed-by: Thomas Huth <thuth@redhat.com>
> >>>
> >>>
> >>
> >> Applied to my trivial-patches branch.
> > 
> > Commit 09e93326e448ab4 says that the switch to ninja from
> > ninjatool removed the requirement for Make 3.82. Is this
> > change still required?
> >
> 
> It seems 09e93326e448ab4 has been committed on 17th of October, so after Thomas' review.
> I remove it from my queue.
> 

I can confirm:

./configure --target-list=x86_64-softmmu --enable-trace-backends=dtrace && make -j$(nproc)

Works fine on macOS with the latest qemu HEAD. The patch can be
discarded.

Regards,
Roman