Bug 9936

Summary:	Host QEMU does not build with SDL support because of pkg-config
Product:	buildroot	Reporter:	Ciro Santilli <ciro.santilli>
Component:	Other	Assignee:	unassigned
Status:	RESOLVED WONTFIX
Severity:	normal	CC:	buildroot
Priority:	P5
Version:	2017.02
Target Milestone:	---
Hardware:	All
OS:	Linux
Host:		Target:
Build:

Description Ciro Santilli 2017-06-03 02:59:01 UTC

I enable:

BR2_PACKAGE_HOST_QEMU=y
BR2_PACKAGE_HOST_QEMU_LINUX_USER_MODE=y
BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y
BR2_PACKAGE_HOST_QEMU_VDE2=y

on the config.

Host QEMU builds and works with VNC, but "-display sdl" is not available.

The configuration logs say:

SDL support       no

However, if I do ./configure directly from host on the QEMU tree, SDL support is available, and builds with it, since I do have the libsdl2-dev package installed in Ubuntu 17.04.

I think the problem is the:

PKG_CONFIG="/home/ciro/bak/git/linux-kernel-module-cheat/buildroot/output/host/usr/bin/pkg-config"

and:

/home/ciro/bak/git/linux-kernel-module-cheat/buildroot/output/host/usr/bin/pkg-config sdl2

is wrongly false, while on host:

pkg-config sdl2

is true.

A dirty workaround is:

diff --git a/package/qemu/qemu.mk b/package/qemu/qemu.mk
index 66efcba..1e09ea4 100644
--- a/package/qemu/qemu.mk
+++ b/package/qemu/qemu.mk
@@ -74,6 +74,7 @@ HOST_QEMU_SYS_ARCH ?= $(HOST_QEMU_ARCH)

 ifeq ($(BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE),y)
 HOST_QEMU_TARGETS += $(HOST_QEMU_SYS_ARCH)-softmmu
+HOST_QEMU_OPTS += --enable-sdl --with-sdlabi=2.0
 HOST_QEMU_OPTS += --enable-system --enable-fdt
 HOST_QEMU_DEPENDENCIES += host-dtc
 else

Comment 1 Ciro Santilli 2017-06-03 03:00:11 UTC

qemu_x86_64_defconfig is the base config.

Comment 2 Thomas Petazzoni 2017-06-03 08:02:43 UTC

We don't want to do this, because it would mean host-qemu would rely on your host installed SDL libraries, which is not what we want. In the current state of things, I don't think we are going to provide a host-qemu package that has SDL/graphics support as that would require to package too many host libraries in Buildroot.