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commit 98b21b2bcf013f59b67b8c4c5944282fa93a6be5
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Author: Frank Ch. Eigler <fche@redhat.com>
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Date: Tue Jun 26 12:16:04 2018 -0400
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configury: add --without-bpf configure option
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Fully autoconf'ing bpf capabilities is error-prone, so provide a blunt
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instrument.
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diff --git a/configure b/configure
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index 9a8a41b..b7a8790 100755
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--- a/configure
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+++ b/configure
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@@ -917,6 +917,7 @@ with_dyninst
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enable_virt
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with_python2_probes
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with_python3_probes
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+with_bpf
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with_selinux
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with_java
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with_extra_version
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@@ -1639,6 +1640,7 @@ Optional Packages:
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--without-python3-probes
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Disable building python version 3 probe support,
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even if it is available
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+ --without-bpf Do not try to build BPF components
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--without-selinux Do not use libselinux even if present
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--with-java=DIRECTORY Specify JDK directory to compile libHelperSDT.so
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against (default is /usr/lib/jvm/java)
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@@ -12297,9 +12299,16 @@ if test $stap_cv_sectionq = yes; then
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fi
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-$as_echo "#define HAVE_BPF_DECLS 0" >>confdefs.h
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-ac_fn_c_check_decl "$LINENO" "BPF_PROG_TYPE_PERF_EVENT" "ac_cv_have_decl_BPF_PROG_TYPE_PERF_EVENT" "#include <linux/bpf.h>
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+# Check whether --with-bpf was given.
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+if test "${with_bpf+set}" = set; then :
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+ withval=$with_bpf;
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+fi
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+
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+
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+if test "x$with_bpf" != "xno"; then :
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+
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+ ac_fn_c_check_decl "$LINENO" "BPF_PROG_TYPE_PERF_EVENT" "ac_cv_have_decl_BPF_PROG_TYPE_PERF_EVENT" "#include <linux/bpf.h>
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"
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if test "x$ac_cv_have_decl_BPF_PROG_TYPE_PERF_EVENT" = xyes; then :
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ac_have_decl=1
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@@ -12311,10 +12320,13 @@ cat >>confdefs.h <<_ACEOF
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#define HAVE_DECL_BPF_PROG_TYPE_PERF_EVENT $ac_have_decl
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_ACEOF
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if test $ac_have_decl = 1; then :
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- $as_echo "#define HAVE_BPF_DECLS 1" >>confdefs.h
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+
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+$as_echo "#define HAVE_BPF_DECLS 1" >>confdefs.h
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fi
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+
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+fi
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if test "x$ac_cv_have_decl_BPF_PROG_TYPE_PERF_EVENT" == "xyes"; then
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HAVE_BPF_DECLS_TRUE=
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HAVE_BPF_DECLS_FALSE='#'
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@@ -12323,7 +12335,6 @@ else
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HAVE_BPF_DECLS_FALSE=
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fi
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-
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ac_config_files="$ac_config_files includes/sys/sdt-config.h po/Makefile.in"
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diff --git a/configure.ac b/configure.ac
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index ea7ffdc..12fc337 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -789,14 +789,20 @@ if test $stap_cv_sectionq = yes; then
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support_section_question=1
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fi
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-dnl Check if we have <linux/bpf.h> for bpf backend.
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-AC_DEFINE([HAVE_BPF_DECLS], [0], [Define to 1 if you have the necessary declarations in bpf.h])
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-AC_CHECK_DECLS([BPF_PROG_TYPE_PERF_EVENT],
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- [AC_DEFINE([HAVE_BPF_DECLS], [1])],
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+
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+AC_ARG_WITH([bpf],
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+ AS_HELP_STRING([--without-bpf],[Do not try to build BPF components]))
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+
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+dnl Allow --without-bpf to disable this autodetection, as some kernels
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+dnl have some headers but missing some decls like __NR_bpf. Too hard
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+dnl to detect all the prereqs here.
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+AS_IF([test "x$with_bpf" != "xno"], [
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+ AC_CHECK_DECLS([BPF_PROG_TYPE_PERF_EVENT],
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+ [AC_DEFINE([HAVE_BPF_DECLS], [1], [Define to 1 if you have the necessary declarations in bpf.h])],
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[],
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[#include <linux/bpf.h>])
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+ ])
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AM_CONDITIONAL(HAVE_BPF_DECLS, [test "x$ac_cv_have_decl_BPF_PROG_TYPE_PERF_EVENT" == "xyes"])
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-
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AC_CONFIG_FILES([includes/sys/sdt-config.h po/Makefile.in])
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if test $build_elfutils = yes -a $enable_translator = yes; then
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