From 697ab0905c59561562dc52cd3b925781e07814f3 Mon Sep 17 00:00:00 2001
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From: Philippe Proulx <eeppeliteloop@gmail.com>
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Date: Wed, 2 Nov 2016 01:40:12 -0400
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Subject: [PATCH] m4/ax_lib_elfutils.m4: add cache variable
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This patch adds an autoconf cache variable to override the
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AC_RUN_IFELSE() test result when cross-compiling.
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Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
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[Philippe: grabbed from this pull request:
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https://github.com/efficios/babeltrace/pull/52
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]
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---
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m4/ax_lib_elfutils.m4 | 32 +++++++++++++++++---------------
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1 file changed, 17 insertions(+), 15 deletions(-)
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diff --git a/m4/ax_lib_elfutils.m4 b/m4/ax_lib_elfutils.m4
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index fcfe06b..f4fcb0d 100644
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--- a/m4/ax_lib_elfutils.m4
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+++ b/m4/ax_lib_elfutils.m4
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@@ -21,7 +21,9 @@
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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# Check the currently installed version of elfutils by using the
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-# _ELFUTILS_PREREQ macro defined in elfutils/version.h.
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+# `_ELFUTILS_PREREQ` macro defined in <elfutils/version.h>.
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+#
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+# The cache variable for this test is `bt_cv_lib_elfutils`.
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#
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# AX_LIB_ELFUTILS(MAJOR_VERSION, MINOR_VERSION, [ACTION-IF-TRUE], [ACTION-IF-FALSE])
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# ---------------------------------------------------------------------------
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@@ -29,7 +31,6 @@ AC_DEFUN([AX_LIB_ELFUTILS], [
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m4_pushdef([major_version], [$1])
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m4_pushdef([minor_version], [$2])
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- AC_MSG_CHECKING([for elfutils version >= major_version.minor_version])
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m4_if([$#], 3, [
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m4_pushdef([true_action], [$3])
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], [
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@@ -43,20 +44,21 @@ AC_DEFUN([AX_LIB_ELFUTILS], [
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AC_MSG_ERROR(elfutils >= major_version.minor_version is required)])
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])
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- AC_RUN_IFELSE([
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- AC_LANG_SOURCE([
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- #include <stdlib.h>
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- #include <elfutils/version.h>
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+ AC_CACHE_CHECK(
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+ [for elfutils version >= major_version.minor_version],
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+ [bt_cv_lib_elfutils], [
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+ AC_RUN_IFELSE([AC_LANG_SOURCE([
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+ #include <stdlib.h>
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+ #include <elfutils/version.h>
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+
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+ int main(void) {
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+ return _ELFUTILS_PREREQ(major_version, minor_version) ? EXIT_SUCCESS : EXIT_FAILURE;
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+ }
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+ ])], [bt_cv_lib_elfutils=yes], [bt_cv_lib_elfutils=no])
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+ ]
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+ )
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- int main(void) {
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- return _ELFUTILS_PREREQ(major_version, minor_version) ? EXIT_SUCCESS : EXIT_FAILURE;
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- }
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- ])
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- ],
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- echo yes
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- true_action,
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- echo no
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- false_action)
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+ AS_IF([test "x$bt_cv_lib_elfutils" = "xyes"], [true_action], [false_action])
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m4_popdef([false_action])
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m4_popdef([true_action])
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--
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2.9.3
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