Develop Reference

Why warnings crashes openJDK-11 build?

I need to build following openJDK
git clone --depth 1 --branch jdk-11+28 https://github.com/openjdk/jdk.git
on aarm64 NAME="Simply Linux", VERSION="9.1 (Destiny)"
For that I run:
bash ./configure
make images > make.log
And it fails with following error (make.log)
Building target 'images' in configuration 'linux-aarch64-normal-server-release'
Warning: No mercurial configuration present and no .src-rev
Compiling 117 files for BUILD_java.compiler.interim
Compiling 394 files for BUILD_jdk.compiler.interim
Compiling 299 files for BUILD_jdk.javadoc.interim
ERROR: Build failed for target 'images' in configuration 'linux-aarch64-normal-server-release' (exit code 2)
=== Output from failing command(s) repeated here ===
* For target hotspot_variant-server_tools_adlc_objs_dfa.o:
/home/user/jdk/src/hotspot/share/adlc/dfa.cpp: In member function ‘const char* Expr::compute_external(const Expr*, const Expr*)’:
/home/user/jdk/src/hotspot/share/adlc/dfa.cpp:724:14: error: ‘char* strncat(char*, const char*, size_t)’ specified bound 2048 equals destination size [-Werror=stringop-overflow=]
strncat(string_buffer, "+", STRING_BUFFER_LENGTH);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/user/jdk/src/hotspot/share/adlc/dfa.cpp:732:14: error: ‘char* strncat(char*, const char*, size_t)’ specified bound 2048 equals destination size [-Werror=stringop-overflow=]
strncat(string_buffer, " + ", STRING_BUFFER_LENGTH);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/user/jdk/src/hotspot/share/adlc/dfa.cpp: In member function ‘const char* Expr::compute_expr(const Expr*, const Expr*)’:
/home/user/jdk/src/hotspot/share/adlc/dfa.cpp:746:14: error: ‘char* strncat(char*, const char*, size_t)’ specified bound 2048 equals destination size [-Werror=stringop-overflow=]
strncat(string_buffer, "+", STRING_BUFFER_LENGTH);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
* All command lines available in /home/user/jdk/build/linux-aarch64-normal-server-release/make-support/failure-logs.
=== End of repeated output ===
No indication of failed target found.
Hint: Try searching the build log for '] Error'.
Hint: See doc/building.html#troubleshooting for assistance.
What am I doing wrong?
Where can I submit a bug report about openjdk11, or discuss this issue?

Running java from VBA macro in Windows 7 bypassing System32 / SysWOW64 javaw.exe

Is there a way to bypass the 32-bit java version (maybe a different way to start a proccess in VBA to invoke the 64-bit version cmd, turn off the UAC or some other sort of tweek) that is being "forced" by the following VBA code (this is just an assumption, I am explaining the debugging process below):
handleDbl = Shell("javaw -cp theJar.jar com.java.SampleClass", vbNormalFocus)
The main point here is that I want to share my macro and avoid putting extra instructions on the recipient so I am trying to do everything on the code (I am using late binding on VBA code to avoid to setting References manually and that kind of stuff).
Debugging Process
An error was thrown so I used the following line instead:
handleDbl = Shell("cmd /k java -cp theJar.jar com.java.SampleClass", vbNormalFocus)
And got the error Exception in thread "main" java.lang.UnsupportedClassVersionError: Unsupported major.minor version so I checked the java -version and tried to find out which java was running with:
C:\>where java
C:\Windows\System32\java.exe
C:\Program Files\Java\_anyJava.x.x.x_\bin\java.exe
I went to System32 folder and there was no java there but I knew that redirection happens from there to C:\Windows\SysWOW64 so I compared the previously extracted java version against C:\Windows\SysWOW64\java.exe -version and they matched.
After that I checked my Outlook version and turned out to be a 32-bit installation. That was a hint but it was mostly that and that big *32 next to the cmd.exe in the Task Manager. I don't know if a 64-bit Outlook would make a difference or it would be the same because of the VBA implementation but that's how I concluded the Shell function from VBA is causing 32-bit java call.

Normally there is a JAVA_HOME environment variable set. If so, then you can do something like this:
Dim JavaExe As String
JavaExe = """" & Environ("JAVA_HOME") & "\bin\java.exe"""
handleDbl = Shell("cmd /k " & JavaExe & " -cp theJar.jar com.java.SampleClass", vbNormalFocus)
If it isn't set, you'll have to find it by some searching, before compiling the command.

Sam's answer is great but I just felt uneasy about user going through more settings so I wrote some functions to check java's versions and notify the user if it is not there (would have to install java in that case anyway) so here is my code. It might contain some helpful stuff.
Private Function IsJavaAvailable(ByVal displayMessage As Boolean, Optional ByVal isJavaMandatory As Boolean) As Boolean
Dim availability As Boolean
Dim minJavaVersion As Integer
minJavaVersion = 8
'isJavaSetup is a global variable
If (Not isJavaSetup) Then
javawPathQuoted = GetMinimumJavaVersion(minJavaVersion)
If StrComp(javawPathQuoted, "") <> 0 Then
isJavaSetup = True
End If
SetGlobalVars
End If
If javawPathQuoted = Empty Then
availability = False
Else
availability = True
End If
If (displayMessage) Then
If (isJavaMandatory) Then
If Not availability Then
MsgBox "This functionality is NOT available without Java " & minJavaVersion & "." & _
vbNewLine & vbNewLine & _
"Please install Java " & minJavaVersion & " or higher.", vbCritical, _
"Mimimum Version Required: Java " & minJavaVersion
End If
Else
If Not availability Then
MsgBox "Some features of this functionality were disabled." & _
vbNewLine & vbNewLine & _
"Please install Java " & minJavaVersion & " or higher.", vbExclamation, _
"Mimimum Version Required: Java " & minJavaVersion
End If
End If
End If
IsJavaAvailable = availability
End Function
Private Function GetMinimumJavaVersion(ByVal javaMinimumMajorVersionInt As Integer) As String
'Run a shell command, returning the output as a string
Dim commandStr As String
Dim javawPathVar As Variant
Dim javaPathStr As Variant
Dim javaVersionStr As String
Dim javaMajorVersionInt As Integer
Dim detectedJavaPaths As Collection
Dim javaVersionElements As Collection
Dim javaVersionOutput As Collection
Dim detectedJavaVersions As Collection
Dim suitableJavawPath As String
'Check available javaw executables in the SO
commandStr = "where javaw"
Set detectedJavaPaths = GetCommandOutput(commandStr)
Set detectedJavaVersions = New Collection
For Each javawPathVar In detectedJavaPaths
'Look for java.exe instead of javaw.exe by substituting it in path
' javaw.exe does NOT return version output like java.exe
javaPathStr = StrReverse(Replace(StrReverse(javawPathVar), StrReverse("javaw.exe"), StrReverse("java.exe"), , 1))
commandStr = """" & javaPathStr & """" & " -version"
Set javaVersionOutput = GetCommandOutput(commandStr)
javaVersionStr = javaVersionOutput.item(1)
Debug.Print "Getting java version: ", commandStr
Debug.Print "Version detected: "; javaVersionStr
Set javaVersionElements = SplitOnDelimiter(javaVersionStr, " ")
'Check that output is not an error or something else
'java version "1.8.0_75"
If javaVersionElements.Count > 2 Then
If StrComp(javaVersionElements.item(1), "java", vbTextCompare) = 0 Then
If StrComp(javaVersionElements.item(2), "version", vbTextCompare) = 0 Then
detectedJavaVersions.Add javaVersionStr
'Remove quotes from "1.8.0_75", split on '.', get 2nd item (java major version) and cast it to Integer
javaMajorVersionInt = CInt(SplitOnDelimiter(SplitOnDelimiter(javaVersionElements.item(3), """").item(1), ".").item(2))
'JAR will only run in Java 8 or later
If (javaMajorVersionInt >= javaMinimumMajorVersionInt) Then
'Validate that "javaw.exe" exists since the validation was made with "java.exe"
Debug.Print "Verifying if javaw.exe exists: ", javawPathVar
If Len(Dir(javawPathVar)) > 0 Then
suitableJavawPath = javawPathVar
Debug.Print "A suitable javaw.exe version found: ", suitableJavawPath
Exit For
End If
End If
End If
End If
End If
Next javawPathVar
GetMinimumJavaVersion = suitableJavawPath
End Function
Private Function GetCommandOutput(ByRef commandStr As String) As Collection
'Run a shell command, returning the output as a string
Dim shellObj As Object
Set shellObj = CreateObject("WScript.Shell")
'run command
Dim wshScriptExecObj As Object
Dim stdOutObj As Object
Dim stdErrObj As Object
Set wshScriptExecObj = shellObj.Exec(commandStr)
Set stdOutObj = wshScriptExecObj.StdOut
Set stdErrObj = wshScriptExecObj.StdErr
'handle the results as they are written to and read from the StdOut object
Dim fullOutputCollection As Collection
Set fullOutputCollection = New Collection
Dim lineStr As String
While Not stdOutObj.AtEndOfStream
lineStr = stdOutObj.ReadLine
If lineStr <> "" Then
fullOutputCollection.Add lineStr
End If
Wend
If fullOutputCollection.Count = 0 Then
While Not stdErrObj.AtEndOfStream
lineStr = stdErrObj.ReadLine
If lineStr <> "" Then
fullOutputCollection.Add lineStr
End If
Wend
End If
Set GetCommandOutput = fullOutputCollection
End Function

libc6-i386 installation on Yocto build

I'm trying add a Java installation on my Yocto build. I would like to run on my embedded system a Java application I developed but I can't correctly install Java.
When I try to run java I get the following:
./java: No such file or directory
I googled for a solution and found that I need to install libc6 32 bit version.
I proceeded to modify my local.conf file as following:
MACHINE ??= "intel-corei7-64"
require conf/multilib.conf
MULTILIBS = "multilib:lib32"
DEFAULTTUNE_virtclass-multilib-lib32 = "x86"
DISTRO ?= "poky"
PACKAGE_CLASSES ?= "package_rpm"
SDKMACHINE ?= "x86_64"
EXTRA_IMAGE_FEATURES ?= "debug-tweaks"
USER_CLASSES ?= "buildstats image-mklibs image-prelink"
PATCHRESOLVE = "noop"
BB_DISKMON_DIRS = "\
STOPTASKS,${TMPDIR},1G,100K \
STOPTASKS,${DL_DIR},1G,100K \
STOPTASKS,${SSTATE_DIR},1G,100K \
STOPTASKS,/tmp,100M,100K \
ABORT,${TMPDIR},100M,1K \
ABORT,${DL_DIR},100M,1K \
ABORT,${SSTATE_DIR},100M,1K \
ABORT,/tmp,10M,1K"
PACKAGECONFIG_append_pn-qemu-native = " sdl"
PACKAGECONFIG_append_pn-nativesdk-qemu = " sdl"
CONF_VERSION = "1"
CORE_IMAGE_EXTRA_INSTALL = " lib32-glibc"
CORE_IMAGE_EXTRA_INSTALL += "opencv opencv-samples libopencv-core-dev libopencv-highgui-dev libopencv-imgproc-dev libopencv-objdetect-dev libopencv-ml-dev"
But i get this error:
Build Configuration:
BB_VERSION = "1.32.0"
BUILD_SYS = "x86_64-linux"
NATIVELSBSTRING = "universal-4.8"
TARGET_SYS = "x86_64-poky-linux"
MACHINE = "intel-corei7-64"
DISTRO = "poky"
DISTRO_VERSION = "2.2.1"
TUNE_FEATURES = "m64 corei7"
TARGET_FPU = ""
meta
meta-poky
meta-yocto-bsp = "morty:924e576b8930fd2268d85f0b151e5f68a3c2afce"
meta-intel = "morty:6add41510412ca196efb3e4f949d403a8b6f35d7"
meta-oe = "morty:fe5c83312de11e80b85680ef237f8acb04b4b26e"
meta-intel-realsense = "morty:2c0dfe9690d2871214fba9c1c32980a5eb89a421"
Initialising tasks: 100% |#####################################################################################################################################################################################################| Time: 0:00:22
NOTE: Executing SetScene Tasks
NOTE: Executing RunQueue Tasks
ERROR: rmc-1.0-r0 do_package: QA Issue: rmc: Files/directories were installed but not shipped in any package:
/usr/lib
/usr/lib/librmclefi.a
/usr/lib/librsmpefi.a
Please set FILES such that these items are packaged. Alternatively if they are unneeded, avoid installing them or delete them within do_install.
rmc: 3 installed and not shipped files. [installed-vs-shipped]
ERROR: rmc-1.0-r0 do_package: Fatal QA errors found, failing task.
ERROR: rmc-1.0-r0 do_package: Function failed: do_package
ERROR: Logfile of failure stored in: /home/dalben/WorkingBuild/poky/filec/tmp/work/corei7-64-poky-linux/rmc/1.0-r0/temp/log.do_package.16424
ERROR: Task (/home/dalben/WorkingBuild/poky/meta-intel/common/recipes-bsp/rmc/rmc.bb:do_package) failed with exit code '1'
NOTE: Tasks Summary: Attempted 2954 tasks of which 2937 didn't need to be rerun and 1 failed.
Summary: 1 task failed:
/home/dalben/WorkingBuild/poky/meta-intel/common/recipes-bsp/rmc/rmc.bb:do_package
Summary: There were 3 ERROR messages shown, returning a non-zero exit code.
Any help is appreciated.
EDIT: Updated question here.

For your information, you will need to do a lot of work in putting Java into your image.
Your current image does not have any java related programs installed since I do not see meta-java in your compile process.
CORE_IMAGE_EXTRA_INSTALL is restricted to OE Core images; So if you have your own image recipe, the variable will does not work unless you inherit core-image.bbclass
Here is an example on putting "openjdk-7-jre" to the image: http://wiki.hioproject.org/index.php?title=OpenHAB:_WeMo_Switch
The key elements are: meta-java, meta-oracle-java .
You will need to add them to your conf/bblayers.conf
BBLAYERS = " \
${BSPDIR}/sources/meta-java \
${BSPDIR}/sources/meta-oracle-java \
"
In conf/local.conf, add this line to install openjdk-7-jre.
IMAGE_INSTALL_append = " openjdk-7-jre "
To add more on what you need, check on https://layers.openembedded.org/layerindex/branch/master/layers/

Launching JRE in Linux from a FAT32 USB

I have a Java application installed on a USB which the user should be able to run from any OS.
For this,
I'm packaging a JRE instance on the USB along with my application.
I'm having a FAT32 file-system on the USB.
However, the problem is, FAT32 has no concept of execute ("+x") permissions. While I can launch a shell script, like so:
$ sh /path/to/fat32-usb/helloWorld.sh
, and while I can launch a simple ELF binary, like so:
$ /lib64/ld-linux-x86-64.so.2 /path/to/fat32-usb/helloWorld
, I can't seem to be able to launch the Java ELF program. I get these errors:
Error: could not find libjava.so
Error: Could not find Java SE Runtime Environment.
Before launching java, I've tried setting these environment variables as follows:
export JAVA_HOME=/path/to/fat32-usb/jre
export LD_LIBRARY_PATH="$JAVA_HOME/lib/amd64:.:$LD_LIBRARY_PATH"
export PATH="$JAVA_HOME/bin:.:$PATH"
I have also tried launching java from inside the $JAVA_HOME/bin directory. Finally, I've also tried copying all the libXXX.so's from $JAVA_HOME/lib/amd64/ to $JAVA_HOME/bin, hoping that they would get picked up from the current directory, ., somehow.
But nothing has worked.
EDIT
Here are the last few lines of strace output:
$ strace -vfo /tmp/java.strace /lib64/ld-linux-x86-64.so.2 /path/to/fat32-usb/jre ...
...
readlink("/proc/self/exe", "/lib/x86_64-linux-gnu/ld-2.17.so", 4096) = 32
write(2, "Error: could not find libjava.so", 32) = 32
write(2, "\n", 1) = 1
write(2, "Error: Could not find Java SE Ru"..., 50) = 50
write(2, "\n", 1) = 1
exit_group(2) = ?
EDIT2
And here is the output of ltrace (just a single line!):
$ ltrace -s 120 -e '*' -ifo /tmp/java.ltrace /lib64/ld-linux-x86-64.so.2 /path/to/fat32-usb/jre ...
30913 [0xffffffffffffffff] +++ exited (status 2) +++
EDIT 3
This is ltrace excerpt around loading of libjava.so by a Java on an ext4 partition (and not the problem FAT32 partition), which I can load fine:
5525 [0x7f7627600763] <... snprintf resumed> "/home/aaa/bbb/jdk1.7.0_40/lib/amd64/libjava.so", 4096, "%s/lib/%s/libjava.so", "/home/aaa/bbb/jdk1.7.0_40", "amd64") = 46
5525 [0x7f762760076d] libjli.so->access("/home/aaa/bbb/jdk1.7.0_40/lib/amd64/libjava.so", 0) = -1
5525 [0x7f762760078d] libjli.so->snprintf( <unfinished ...>
5525 [0x3085246bdb] libc.so.6->(0, 0x7fffffd8, 0x7f7627607363, 39) = 0
5525 [0x3085246be3] libc.so.6->(0, 0x7fffffd8, 0x7f7627607363, 39) = 0
5525 [0x7f762760078d] <... snprintf resumed> "/home/aaa/bbb/jdk1.7.0_40/jre/lib/amd64/libjava.so", 4096, "%s/jre/lib/%s/libjava.so", "/home/aaa/bbb/jdk1.7.0_40", "amd64") = 50
5525 [0x7f7627600797] libjli.so->access("/home/aaa/bbb/jdk1.7.0_40/jre/lib/amd64/libjava.so", 0) = 0
And this is the strace output of, again, the healthy/loading java.
5952 readlink("/proc/self/exe", "/home/aaa/bbb/jdk1.7.0_40/bin/ja"..., 4096) = 34
5952 access("/home/aaa/bbb/jdk1.7.0_40/lib/amd64/libjava.so", F_OK) = -1 ENOENT (No such file or directory)
5952 access("/home/aaa/bbb/jdk1.7.0_40/jre/lib/amd64/libjava.so", F_OK) = 0
5952 open("/home/aaa/bbb/jdk1.7.0_40/jre/lib/amd64/jvm.cfg", O_RDONLY) = 3

Autoconf test for JNI include dir

I'm working on a configuration script for a JNI wrapper. One of the configuration parameters is the path to jni.h. What's a good quick-and-dirty Autoconf test for whether this parameter is set correctly for C++ compilation? You can assume you're running on Linux and g++ is available.
Alternatively, is there a way to get javah (or a supporting tool) to give me this path directly?

Then there is the easy way: http://www.gnu.org/software/autoconf-archive/ax_jni_include_dir.html
Sometimes it is best to just use the standard recipies.

Checking for headers is easy; just use AC_CHECK_HEADER. If it's in a weird place (i.e., one the compiler doesn't know about), it's entirely reasonable to expect users to set CPPFLAGS.
The hard part is actually locating libjvm. You typically don't want to link with this; but you may want to default to a location to dlopen it from if JAVA_HOME is not set at run time.
But I don't have a better solution than requiring that JAVA_HOME be set at configure time. There's just too much variation in how this stuff is deployed across various OSes (even just Linux distributions). This is what I do:
AC_CHECK_HEADER([jni.h], [have_jni=yes])
AC_ARG_VAR([JAVA_HOME], [Java Runtime Environment (JRE) location])
AC_ARG_ENABLE([java-feature],
[AC_HELP_STRING([--disable-java-feature],
[disable Java feature])])
case $target_cpu in
x86_64) JVM_ARCH=amd64 ;;
i?86) JVM_ARCH=i386 ;;
*) JVM_ARCH=$target_cpu ;;
esac
AC_SUBST([JVM_ARCH])
AS_IF([test X$enable_java_feature != Xno],
[AS_IF([test X$have_jni != Xyes],
[AC_MSG_FAILURE([The Java Native Interface is required for Java feature.])])
AS_IF([test -z "$JAVA_HOME"],
[AC_MSG_WARN([JAVA_HOME has not been set. JAVA_HOME must be set at run time to locate libjvm.])],
[save_LDFLAGS=$LDFLAGS
LDFLAGS="-L$JAVA_HOME/lib/$JVM_ARCH/client -L$JAVA_HOME/lib/$JVM_ARCH/server $LDFLAGS"
AC_CHECK_LIB([jvm], [JNI_CreateJavaVM], [LIBS=$LIBS],
[AC_MSG_WARN([no libjvm found at JAVA_HOME])])
LDFLAGS=$save_LDFLAGS
])])

FYI - the patch below against the latest ax_jni_include_dir.m4 works for me on Macos 11.1.
--- a/m4/ax_jni_include_dir.m4
+++ b/m4/ax_jni_include_dir.m4
## -73,13 +73,19 ## fi
case "$host_os" in
darwin*) # Apple Java headers are inside the Xcode bundle.
- macos_version=$(sw_vers -productVersion | sed -n -e 's/^#<:#0-9#:>#
*.\(#<:#0-9#:>#*\).#<:#0-9#:>#*/\1/p')
- if #<:# "$macos_version" -gt "7" #:>#; then
- _JTOPDIR="$(xcrun --show-sdk-path)/System/Library/Frameworks/JavaVM.framework"
- _JINC="$_JTOPDIR/Headers"
+ major_macos_version=$(sw_vers -productVersion | sed -n -e 's/^\(#<:#0-9#:>#*\).#<:#0-9#:>#*.#<:#0-9#:>#*/\1/p')
+ if #<:# "$major_macos_version" -gt "10" #:>#; then
+ _JTOPDIR="$(/usr/libexec/java_home)"
+ _JINC="$_JTOPDIR/include"
else
- _JTOPDIR="/System/Library/Frameworks/JavaVM.framework"
- _JINC="$_JTOPDIR/Headers"
+ macos_version=$(sw_vers -productVersion | sed -n -e 's/^#<:#0-9#:>#*.\(#<:#0-9#:>#*\).#<:#0-9#:>#*/\1/p')
+ if #<:# "$macos_version" -gt "7" #:>#; then
+ _JTOPDIR="$(xcrun --show-sdk-path)/System/Library/Frameworks/JavaVM.framework"
+ _JINC="$_JTOPDIR/Headers"
+ else
+ _JTOPDIR="/System/Library/Frameworks/JavaVM.framework"
+ _JINC="$_JTOPDIR/Headers"
+ fi
fi
;;
*) _JINC="$_JTOPDIR/include";;