Add GOBject Builder detection macro.

[dxcommon.git] / m4 / gob2.m4

diff --git a/m4/gob2.m4 b/m4/gob2.m4
new file mode 100644 (file)
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--- /dev/null
+++ b/m4/gob2.m4
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+dnl Copyright © 2020 Nick Bowler
+dnl License WTFPL2: Do What the Fuck You Want To Public License, version 2.
+dnl This is free software: you are free to do what the fuck you want to.
+dnl There is NO WARRANTY, to the extent permitted by law.
+
+dnl DX_PROG_GOB2([min-version], [action-if-found], [action-if-not-found])
+dnl
+dnl Search PATH for a working gob2 utility with the given minimum version,
+dnl which may be empty to accept any version.  If found, the GOB2 variable
+dnl (which is substituted with AC_SUBST) is set with the result, and
+dnl action-if-found is executed.  Otherwise, action-if-found is executed
+dnl if nonempty, else configure will exit with a fatal error.
+
+AC_DEFUN([DX_PROG_GOB2], [AC_ARG_VAR([GOB2], [GOBject Builder command])dnl
+AC_PREREQ([2.62])dnl
+cat >conftest.gob <<'EOF'
+m4_ifnblank([$1], [requires $1
+])dnl
+class :Conftest from G:Object
+{
+}
+EOF
+AC_CACHE_CHECK([for GObject Builder], [ac_cv_path_GOB2],
+[dx_cv_gob_found=:
+AC_PATH_PROGS_FEATURE_CHECK([GOB2], [gob2],
+[rm -f conftest.c
+$ac_path_GOB2 conftest.gob >&AS_MESSAGE_LOG_FD 2>&1 && test -f conftest.c && {
+  gob_relcmd=${ac_path_GOB2##*/}
+  gob_bypath=`command -v "$gob_relcmd"` # ''
+  ac_cv_path_GOB2=$ac_path_GOB2
+  test x"$gob_bypath" = x"$ac_path_GOB2" && ac_cv_path_GOB2=$gob_relcmd
+  ac_path_GOB2_found=:
+  dx_cv_gob_works=yes
+}], [ac_cv_path_GOB2=no dx_cv_gob_found=false])
+])
+AS_IF([$dx_cv_gob_found],
+[GOB2=$ac_cv_path_GOB2
+AC_CACHE_CHECK([whether $GOB2 works], [dx_cv_gob_works],
+[rm -f conftest.c
+if $GOB2 conftest.gob >&AS_MESSAGE_LOG_FD 2>&1 && test -f conftest.c; then
+  dx_cv_gob_works=yes
+else
+  dx_cv_gob_works=no
+fi])])
+AS_IF([test x"$dx_cv_gob_works" = x"yes"],
+  [$2], [m4_default([$3], [AC_MSG_FAILURE(
+[GObject Builder m4_ifnblank([$1], [version at least $1 ])is required.
+
+The latest version may be found at <https://draconx.ca/projects/gob-dx/>.
+])])])
+rm -f conftest*
+])