How to build hotspot jtreg test JNI with specific CFLAGS?

[Severin Gehwolf]

Hi,

On Mon, 2018-08-06 at 09:52 +0200, Severin Gehwolf wrote:
> > > I'm trying to get a JNI library used for testing to be compiled with
> > > certain CFLAGS. In particular, I'm trying to get it compiled on a GCC
> > > platform with '-fomit-frame-pointer' and/or '-fomit-frame-pointer -O3'.
> > > The patch currently looks like this:
> > > 
> > > diff --git a/make/test/JtregNativeHotspot.gmk b/make/test/JtregNativeHotspot.gmk
> > > --- a/make/test/JtregNativeHotspot.gmk
> > > +++ b/make/test/JtregNativeHotspot.gmk
> > > @@ -139,6 +139,13 @@
> > >       -I$(VM_TESTBASE_DIR)/nsk/share/native \
> > >       -I$(VM_TESTBASE_DIR)/nsk/share/jni
> > >   
> > > +NO_FRAMEPOINTER_CFLAGS :=
> > > +ifeq ($(OPENJDK_TARGET_OS),linux)
> > > +   NO_FRAMEPOINTER_CFLAGS := -O3 -fomit-frame-pointer
> > > +endif
> > > +
> > > +BUILD_HOTSPOT_JTREG_LIBRARIES_CFLAGS_libNoFramePointer := $(NO_FRAMEPOINTER_CFLAGS)
> > > +
> > >   BUILD_HOTSPOT_JTREG_LIBRARIES_CFLAGS_libProcessUtils := $(VM_SHARE_INCLUDES)
> > >   
> > >   BUILD_HOTSPOT_JTREG_LIBRARIES_CFLAGS_libThreadController := $(NSK_MONITORING_INCLUDES)
> > > 
> > > When I look at the compile command line this produces with 'make run-test', I see this:
> > > 
> > > $ cat ./build/linux-x86_64-normal-server-release/support/test/hotspot/jtreg/native/support/libNoFramePointer/libNoFramePointer.o.cmdline
> > > /usr/bin/gcc -I/disk/openjdk/upstream-sources/openjdk-head/build/linux-x86_64-normal-server-release/support/modules_include/java.base -I/disk/openjdk/upstream-sources/openjdk-head/build/linux-x86_64-normal-server-release/support/modules_include/java.base/linux -I/disk/openjdk/upstream-sources/openjdk-head/src/java.base/share/native/libjava -I/disk/openjdk/upstream-sources/openjdk-head/src/java.base/unix/native/libjava -I/disk/openjdk/upstream-sources/openjdk-head/src/hotspot/share/include -I/disk/openjdk/upstream-sources/openjdk-head/src/hotspot/os/posix/include -pipe -D_GNU_SOURCE -D_REENTRANT -D_LARGEFILE64_SOURCE -DLINUX -DNDEBUG -Wall -Wextra -Wno-unused -Wno-unused-parameter -Wformat=2 -fno-strict-aliasing -m64 -D_LITTLE_ENDIAN -DARCH='"amd64"' -Damd64 -D_LP64=1 -fno-omit-frame-pointer -fno-delete-null-pointer-checks -fno-lifetime-dse -fPIC -O3 -fomit-frame-pointer -g -O2 -DTHIS_FILE='""' -c -MMD -MF /disk/openjdk/upstream-sources/openjdk-head/build/linux-x86_64-normal-server-release/support/test/hotspot/jtreg/native/support/libNoFramePointer/libNoFramePointer.d -o /disk/openjdk/upstream-sources/openjdk-head/build/linux-x86_64-normal-server-release/support/test/hotspot/jtreg/native/support/libNoFramePointer/libNoFramePointer.o /disk/openjdk/upstream-sources/openjdk-head/test/hotspot/jtreg/serviceability/sa/libNoFramePointer.c
> > > 
> > > The command line has '-O3 -fomit-frame-pointer -g -O2' in that order.
> > > This screws things up since -O2 seems to override -fomit-frame-pointer.
> > > My guess is that -O2 is from OPTIMIZATION == LOW, but not sure. How can
> > > I get this -O2 flag removed which apparently gets added later?

It was indeed an issue with OPTIMIZATION. A value of LOW is hard-coded
in TestFilesCompilation. This patch fixes this by allowing one to
override OPTIMIZATION per library via something like this:

BUILD_HOTSPOT_JTREG_LIBRARIES_OPTIMIZATION_libNoFramePointer := HIGH

diff --git a/make/common/TestFilesCompilation.gmk b/make/common/TestFilesCompilation.gmk
--- a/make/common/TestFilesCompilation.gmk
+++ b/make/common/TestFilesCompilation.gmk
@@ -94,7 +94,7 @@
         CFLAGS := $$($1_CFLAGS) $$($1_CFLAGS_$$(name)), \
         LDFLAGS := $$($1_LDFLAGS) $$($1_LDFLAGS_$$(name)), \
         LIBS := $$($1_LIBS_$$(name)), \
-        OPTIMIZATION := LOW, \
+        OPTIMIZATION := $$(if $$($1_OPTIMIZATION_$$(name)),$$($1_OPTIMIZATION_$$(name)),LOW), \
         COPY_DEBUG_SYMBOLS := false, \
         STRIP_SYMBOLS := false, \
     )) \

Thanks,
Severin