[Buildroot] [PATCH 0/2] hostapd/wpa_s: disable build with static zlib-ng

[Buildroot] [PATCH 0/2] hostapd/wpa_s: disable build with static zlib-ng

[Sergey Matyukevich]

Hi all,

Both zlib-ng and hostapd/wpa_supplicant utils define functions with the
same name 'crc32'. For now do not allow to select zlib-ng as zlib
provider for hostapd or wpa_supplicant in the case of BR2_STATIC_LIBS
is selected. This change can be reverted if either project rename
that function.

Regards,
Sergey

Sergey Matyukevich (2):
  package/hostapd: disable build with static zlib-ng
  package/wpa_supplicant: disable build with static zlib-ng

 package/hostapd/Config.in        | 4 ++++
 package/wpa_supplicant/Config.in | 4 ++++
 2 files changed, 8 insertions(+)

-- 
2.37.1

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[Buildroot] [PATCH 1/2] package/hostapd: disable build with static zlib-ng

[Sergey Matyukevich]

Static linking fails because both hostapd and zlib-ng define functions
with the same name 'crc32'. For now do not allow to select zlib-ng as
zlib provider for hostapd in the case if static libraries are enabled.

Fixes: http://autobuild.buildroot.net/results/9901df820d3afa4cde78e8ad6d62cb8ce7e69fdb/

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
---
 package/hostapd/Config.in | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/hostapd/Config.in b/package/hostapd/Config.in
index f4206ceea5..3a88a9d276 100644
--- a/package/hostapd/Config.in
+++ b/package/hostapd/Config.in
@@ -1,6 +1,7 @@
 config BR2_PACKAGE_HOSTAPD
 	bool "hostapd"
 	depends on BR2_USE_MMU # fork()
+	depends on !(BR2_PACKAGE_ZLIB_NG && BR2_STATIC_LIBS)
 	select BR2_PACKAGE_LIBOPENSSL_ENABLE_DES if BR2_PACKAGE_LIBOPENSSL
 	select BR2_PACKAGE_LIBOPENSSL_ENABLE_MD4 if BR2_PACKAGE_LIBOPENSSL
 	help
@@ -12,6 +13,9 @@ config BR2_PACKAGE_HOSTAPD
 
 	  http://w1.fi/hostapd/
 
+comment "hostapd fails to build with static zlib-ng"
+	depends on BR2_PACKAGE_ZLIB_NG && BR2_STATIC_LIBS
+
 if BR2_PACKAGE_HOSTAPD
 
 config BR2_PACKAGE_HOSTAPD_DRIVER_HOSTAP
-- 
2.37.1

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[Buildroot] [PATCH 2/2] package/wpa_supplicant: disable build with static zlib-ng

[Sergey Matyukevich]

Static linking fails because both wpa_supplicant and zlib-ng define
functions with the same name 'crc32'. For now do not allow to select
zlib-ng as zlib provider for wpa_supplicant in the case if static
libraries are enabled.

Fixes: http://autobuild.buildroot.net/results/ac19975f0bf77f4a8ca574c374092ba81cd5a332/

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
---
 package/wpa_supplicant/Config.in | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/wpa_supplicant/Config.in b/package/wpa_supplicant/Config.in
index 92953f69f0..b44d3e2d07 100644
--- a/package/wpa_supplicant/Config.in
+++ b/package/wpa_supplicant/Config.in
@@ -1,6 +1,7 @@
 menuconfig BR2_PACKAGE_WPA_SUPPLICANT
 	bool "wpa_supplicant"
 	depends on BR2_USE_MMU # fork()
+	depends on !(BR2_PACKAGE_ZLIB_NG && BR2_STATIC_LIBS)
 	select BR2_PACKAGE_LIBOPENSSL_ENABLE_DES if BR2_PACKAGE_LIBOPENSSL
 	select BR2_PACKAGE_LIBOPENSSL_ENABLE_MD4 if BR2_PACKAGE_LIBOPENSSL
 	help
@@ -8,6 +9,9 @@ menuconfig BR2_PACKAGE_WPA_SUPPLICANT
 
 	  http://w1.fi/wpa_supplicant/
 
+comment "wpa_supplicant fails to build with static zlib-ng"
+	depends on BR2_PACKAGE_ZLIB_NG && BR2_STATIC_LIBS
+
 if BR2_PACKAGE_WPA_SUPPLICANT
 
 config BR2_PACKAGE_WPA_SUPPLICANT_NL80211
-- 
2.37.1

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Re: [Buildroot] [PATCH 1/2] package/hostapd: disable build with static zlib-ng

[Thomas Petazzoni via buildroot]

On Sun,  4 Sep 2022 23:14:28 +0300
Sergey Matyukevich <geomatsi@gmail.com> wrote:

> Static linking fails because both hostapd and zlib-ng define functions
> with the same name 'crc32'. For now do not allow to select zlib-ng as
> zlib provider for hostapd in the case if static libraries are enabled.
> 
> Fixes: http://autobuild.buildroot.net/results/9901df820d3afa4cde78e8ad6d62cb8ce7e69fdb/
> 
> Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
> ---
>  package/hostapd/Config.in | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/package/hostapd/Config.in b/package/hostapd/Config.in
> index f4206ceea5..3a88a9d276 100644
> --- a/package/hostapd/Config.in
> +++ b/package/hostapd/Config.in
> @@ -1,6 +1,7 @@
>  config BR2_PACKAGE_HOSTAPD
>  	bool "hostapd"
>  	depends on BR2_USE_MMU # fork()
> +	depends on !(BR2_PACKAGE_ZLIB_NG && BR2_STATIC_LIBS)

Thanks for your patch. However, we generally don't like to add such
weird dependencies. Instead, we prefer to fix the actual problem:
hostapd/wpa_supplicant should probably not define a crc32() function,
but use some other naming for it.

Thanks!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] [PATCH 1/2] package/hostapd: disable build with static zlib-ng

[Sergey Matyukevich]

> > Static linking fails because both hostapd and zlib-ng define functions
> > with the same name 'crc32'. For now do not allow to select zlib-ng as
> > zlib provider for hostapd in the case if static libraries are enabled.
> > 
> > Fixes: http://autobuild.buildroot.net/results/9901df820d3afa4cde78e8ad6d62cb8ce7e69fdb/
> > 
> > Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
> > ---
> >  package/hostapd/Config.in | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/package/hostapd/Config.in b/package/hostapd/Config.in
> > index f4206ceea5..3a88a9d276 100644
> > --- a/package/hostapd/Config.in
> > +++ b/package/hostapd/Config.in
> > @@ -1,6 +1,7 @@
> >  config BR2_PACKAGE_HOSTAPD
> >  	bool "hostapd"
> >  	depends on BR2_USE_MMU # fork()
> > +	depends on !(BR2_PACKAGE_ZLIB_NG && BR2_STATIC_LIBS)
> 
> Thanks for your patch. However, we generally don't like to add such
> weird dependencies. Instead, we prefer to fix the actual problem:
> hostapd/wpa_supplicant should probably not define a crc32() function,
> but use some other naming for it.

Indeed, suggested dependency is too weird. I sent a patch to hostapd
mailing list fixing too generic name for its IEEE 802.11 CRC-32:
http://lists.infradead.org/pipermail/hostap/2022-September/040752.html
If it is ok with hostapd maintainer, then I will split/adapt this patch
for hostapd/wpa_s v2.10 and send v2 here.

Regards,
Sergey
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