CODEWITHSUNDEEP
javajava-native-interfaceautoconf
Chris Conway
Chris Conway

Reputation: 55999

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?

Upvotes: 5

Views: 2376

Answers (3)

Quincey Koziol
Quincey Koziol

Reputation: 140

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";;

Upvotes: 0

Christopher Smith
Christopher Smith

Reputation: 5542

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.

Upvotes: 7

Braden
Braden

Reputation: 1507

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
])])

Upvotes: 5

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