[PATCH] BaseTools/VfrCompile: honor EXTRA_LDFLAGS

[Laszlo Ersek <lersek@redhat.com>]

In commit 81502cee20ac ("BaseTools/Source/C: take EXTRA_LDFLAGS from the
caller", 2018-08-16), I missed that "VfrCompile/GNUmakefile" does not use
BUILD_LFLAGS in the APPLICATION linking rule, unlike "app.makefile" does.
Instead, "VfrCompile/GNUmakefile" uses the (undefined) LFLAGS macro.
Therefore commit 81502cee20ac did not cover the linking step of
VfrCompile.

Thankfully, the structure of the linking rules is the same, between
"app.makefile" and "VfrCompile/GNUmakefile". Rename the undefined LFLAGS
macro in "VfrCompile/GNUmakefile" to VFR_LFLAGS (for consistency with
VFR_CXXFLAGS), and set it to EXTRA_LDFLAGS.

As a result, we have:

             | compilation                    | linking
  -----------+--------------------------------+----------------------
  VfrCompile | VFR_CXXFLAGS =                 | VFR_LFLAGS =
             | BUILD_OPTFLAGS =               | EXTRA_LDFLAGS
             | '-O2' + EXTRA_OPTFLAGS         |
  -----------+--------------------------------+----------------------
  other apps | BUILD_CFLAGS/BUILD_CXXFLAGS =  | BUILD_LFLAGS =
             | [...] + BUILD_OPTFLAGS =       | [...] + EXTRA_LDFLAGS
             | [...] + '-O2' + EXTRA_OPTFLAGS |

This table shows
- that the VfrCompile compilation and linking flags are always a subset of
  the corresponding flags used by the other apps,
- and that the EXTRA flags are always at the end.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1540244
Fixes: 81502cee20ac4046f08bb4aec754c7091c8808dc
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---

Notes:
    Repo:   https://github.com/lersek/edk2.git
    Branch: extra_flags_rhbz1540244_round2

 BaseTools/Source/C/VfrCompile/GNUmakefile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/BaseTools/Source/C/VfrCompile/GNUmakefile b/BaseTools/Source/C/VfrCompile/GNUmakefile
index bbe562cbc54f..9273589ff805 100644
--- a/BaseTools/Source/C/VfrCompile/GNUmakefile
+++ b/BaseTools/Source/C/VfrCompile/GNUmakefile
@@ -28,6 +28,9 @@ VFR_CPPFLAGS = -DPCCTS_USE_NAMESPACE_STD $(BUILD_CPPFLAGS)
 # keep BUILD_OPTFLAGS last
 VFR_CXXFLAGS = $(BUILD_OPTFLAGS)
 
+# keep EXTRA_LDFLAGS last
+VFR_LFLAGS = $(EXTRA_LDFLAGS)
+
 LINKER = $(BUILD_CXX)
 
 EXTRA_CLEAN_OBJECTS = EfiVfrParser.cpp EfiVfrParser.h VfrParser.dlg VfrTokens.h VfrLexer.cpp VfrLexer.h VfrSyntax.cpp tokens.h
@@ -42,7 +45,7 @@ APPLICATION = $(MAKEROOT)/bin/$(APPNAME)
 all: $(MAKEROOT)/bin $(APPLICATION) 
 
 $(APPLICATION): $(OBJECTS) 
-	$(LINKER) -o $(APPLICATION) $(LFLAGS) $(OBJECTS) -L$(MAKEROOT)/libs $(LIBS)
+	$(LINKER) -o $(APPLICATION) $(VFR_LFLAGS) $(OBJECTS) -L$(MAKEROOT)/libs $(LIBS)
 
 VfrCompiler.o: ../Include/Common/BuildVersion.h
 
-- 
2.14.1.3.gb7cf6e02401b