Fontconfig head is null

Description:

The upgrade 2:2.15.0-3: Modernize, use libxml2 breaks java application.

Additional info:

The bisect process to conclude which is the first bad commit is:

java application was working before upgrading
[2025-01-20T11:09:31+0100] [ALPM] upgraded fontconfig (2:2.15.0-2 -> 2:2.16.0-1)
java application broken
[2025-01-21T13:09:51+0100] [ALPM] downgraded fontconfig (2:2.16.0-1 -> 2:2.15.0-3)
java application broken
[2025-01-21T13:11:50+0100] [ALPM] downgraded fontconfig (2:2.15.0-3 -> 2:2.15.0-2)
java application working

fontconfig 2:2.16.0-1 is from the official archlinux mirrors.

I have built fontconfig 2:2.15.0-3 from d7144e8 2:2.15.0-3: Modernize, use libxml2

I have built fontconfig 2:2.15.0-2 from 27936e3 add nvchecker.toml

When it fails, the reported messages are:

$ ./FPGAs_AdaptiveSoCs_Unified_2024.2_1113_1001_Lin64.bin 
Verifying archive integrity... All good.
Uncompressing AMD Installer for FPGAs and Adaptive SoCs...
This is a fresh install.
INFO Could not detect the display scale (hDPI).
       If you are using a high resolution monitor, you can set the installer scale factor like this: 
       export XINSTALLER_SCALE=2
       setenv XINSTALLER_SCALE 2
ERROR: Installer could not be started. Fontconfig head is null, check your fonts or fonts configuration
java.lang.RuntimeException: Fontconfig head is null, check your fonts or fonts configuration
	at java.desktop/sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1263)
	at java.desktop/sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:221)
	at java.desktop/sun.awt.FontConfiguration.init(FontConfiguration.java:105)
	at java.desktop/sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:696)
	at java.desktop/sun.font.SunFontManager$2.run(SunFontManager.java:352)
	at java.desktop/sun.font.SunFontManager$2.run(SunFontManager.java:309)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:319)
	at java.desktop/sun.font.SunFontManager.<init>(SunFontManager.java:309)
	at java.desktop/sun.awt.FcFontManager.<init>(FcFontManager.java:35)
	at java.desktop/sun.awt.X11FontManager.<init>(X11FontManager.java:55)
	at java.desktop/sun.font.PlatformFontInfo.createFontManager(PlatformFontInfo.java:37)
	at java.desktop/sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:51)
	at java.desktop/java.awt.Font.getFont2D(Font.java:526)
	at java.desktop/java.awt.Font.getFamily(Font.java:1433)
	at java.desktop/java.awt.Font.getFamily_NoClientCode(Font.java:1407)
	at java.desktop/java.awt.Font.getFamily(Font.java:1399)
	at com.xilinx.installer.gui.r.c(Unknown Source)
	at com.xilinx.installer.gui.r.<init>(Unknown Source)
	at com.xilinx.installer.gui.InstallerGUI.C(Unknown Source)
	at com.xilinx.installer.gui.InstallerGUI.B(Unknown Source)
	at com.xilinx.installer.gui.InstallerGUI.<init>(Unknown Source)
	at com.xilinx.installer.gui.InstallerGUI.<clinit>(Unknown Source)
	at com.xilinx.installer.api.InstallerLauncher.main(Unknown Source)

Steps to reproduce:

Unfortunately, the issue appears on a closed source application. It is free to download, but requires registration:

https://www.xilinx.com/member/forms/download/xef.html?filename=FPGAs_AdaptiveSoCs_Unified_2024.2_1113_1001_Lin64.bin

added priority3-normal severity4-low statusunconfirmed labels

assigned to @freswa, @andyrtr, @toolybird, and @gromit

Could you please try to bisect the breakage with the upstream sources? See https://wiki.archlinux.org/title/Bisecting_bugs_with_Git

assigned to @heftig

unassigned @heftig

assigned to @heftig

added statusconfirmed label and removed statusunconfirmed label

unassigned @freswa, @toolybird, and @gromit

There is no need to bisect upstream because removing the line -D xml-backend=libxml2 from the latest version 55920b5 2:2.16.0-1 works fine.

So, the issue is introduced by the switch from expat to libxml2.

This affects not only the installer but also vivado itself

closed with commit c281f0e5