Build failed in Jenkins: edk2 #2791

[Laszlo Ersek <lersek@redhat.com>]

Hi Brijesh,

Gerd's Jenkins CI caught a number of (most likely invalid)
[-Werror=maybe-uninitialized] issues with the new code. Do you have a
way to build the tree for IA32 with DEBUG_GCC49, evaluate the errors,
and send a series to suppress the warnings whenever they are invalid?
(Simply by assigning zero to the affected variables early into the
affected functions.)

Please note that the coding style requires a specific comment format for
such warning suppressions:

https://bugzilla.tianocore.org/show_bug.cgi?id=607

Of course, if some of these warnings happen to be correct, then the bugs
should be fixed. :)

Please find the first such error below.

Thanks!
Laszlo

-------- Forwarded Message --------
Subject: Build failed in Jenkins: edk2 #2791
Date: Tue, 11 Jul 2017 11:00:57 +0200 (CEST)

OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c: In function 'InternalQemuFwCfgDmaBytes':
OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c:168:5: error: 'NumPages' may be used uninitialized in this function [-Werror=maybe-uninitialized]
     InternalQemuFwCfgSevDmaFreeBuffer (BounceBuffer, NumPages);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make: *** [Build/OvmfIa32/DEBUG_GCC49/IA32/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib/OUTPUT/QemuFwCfgLib.obj] Error 1
GNUmakefile:330: recipe for target 'Build/OvmfIa32/DEBUG_GCC49/IA32/OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgPeiLib/OUTPUT/QemuFwCfgLib.obj' failed