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| -rw-r--r-- | m4/full-header-path.m4 | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/m4/full-header-path.m4 b/m4/full-header-path.m4 new file mode 100644 index 000000000..b54e1b39c --- /dev/null +++ b/m4/full-header-path.m4 @@ -0,0 +1,41 @@ +# full-header-path.m4 serial 2 +dnl Copyright (C) 2006 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +dnl From Derek Price. + +# gl_FULL_HEADER_PATH(HEADER1 HEADER2 ...) +# ---------------------------------------- +# Find the full path to a header file, assuming the header exists. +# If the header were sys/inttypes.h, this macro would define +# FULL_PATH_SYS_INTTYPES_H to the `<>' quoted full path to sys/inttypes.h +# in config.h +# (e.g. `#define FULL_PATH_SYS_INTTYPES_H </usr/include/sys/inttypes.h>'). +AC_DEFUN([gl_FULL_HEADER_PATH], +[AC_LANG_PREPROC_REQUIRE()dnl +AC_FOREACH([gl_HEADER_NAME], [$1], + [AS_VAR_PUSHDEF([gl_full_header_path], + [gl_cv_full_path_]m4_quote(m4_defn([gl_HEADER_NAME])))dnl + AC_CACHE_CHECK([full path to <]m4_quote(m4_defn([gl_HEADER_NAME]))[>], + m4_quote(m4_defn([gl_full_header_path])), + [AS_VAR_PUSHDEF([ac_header_exists], + [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME])))dnl + AC_CHECK_HEADERS_ONCE(m4_quote(m4_defn([gl_HEADER_NAME])))dnl + if test AS_VAR_GET(ac_header_exists) = yes; then + AC_LANG_CONFTEST([AC_LANG_SOURCE([[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]])]) +dnl eval is necessary to expand ac_cpp. +dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell. + AS_VAR_SET(gl_full_header_path, +[`(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | +sed -n '\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1#;p;q;}'`]) + fi + AS_VAR_POPDEF([ac_header_exists])dnl + ])dnl + AC_DEFINE_UNQUOTED(AS_TR_CPP([FULL_PATH_]m4_quote(m4_defn([gl_HEADER_NAME]))), + [<AS_VAR_GET(gl_full_header_path)>], + [Define this to the full path to <]m4_quote(m4_defn([gl_HEADER_NAME]))[>.]) + AS_VAR_POPDEF([gl_full_header_path])dnl +])dnl +])# gl_FULL_HEADER_PATH |