- [AS_VAR_PUSHDEF([gl_header_exists],
- [ac_cv_header_]m4_defn([gl_HEADER_NAME]))
- if test AS_VAR_GET(gl_header_exists) = yes; then
- AC_LANG_CONFTEST(
- [AC_LANG_SOURCE(
- [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]]
- )])
- dnl AIX "xlc -E" and "cc -E" omit #line directives for header files
- dnl that contain only a #include of other header files and no
- dnl non-comment tokens of their own. This leads to a failure to
- dnl detect the absolute name of <dirent.h>, <signal.h>, <poll.h>
- dnl and others. The workaround is to force preservation of comments
- dnl through option -C. This ensures all necessary #line directives
- dnl are present. GCC supports option -C as well.
- case "$host_os" in
- aix*) gl_absname_cpp="$ac_cpp -C" ;;
- *) gl_absname_cpp="$ac_cpp" ;;
- esac
- dnl eval is necessary to expand gl_absname_cpp.
- dnl Ultrix and Pyramid sh refuse to redirect output of eval,
- dnl so use subshell.
- AS_VAR_SET([gl_next_header],
- ['"'`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
- sed -n '\#/]m4_defn([gl_HEADER_NAME])[#{
- s#.*"\(.*/]m4_defn([gl_HEADER_NAME])[\)".*#\1#
- s#^/[^/]#//&#
- p
- q
- }'`'"'])
- else
- AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])
- fi
- AS_VAR_POPDEF([gl_header_exists])])
+ [m4_if([$2], [check],
+ [AS_VAR_PUSHDEF([gl_header_exists],
+ [ac_cv_header_]m4_defn([gl_HEADER_NAME]))
+ if test AS_VAR_GET(gl_header_exists) = yes; then
+ AS_VAR_POPDEF([gl_header_exists])
+ ])
+ gl_ABSOLUTE_HEADER_ONE(gl_HEADER_NAME)
+ AS_VAR_COPY([gl_header], [gl_cv_absolute_]AS_TR_SH(gl_HEADER_NAME))
+ AS_VAR_SET(gl_next_header, ['"'$gl_header'"'])
+ m4_if([$2], [check],
+ [else
+ AS_VAR_SET(gl_next_header, ['<'gl_HEADER_NAME'>'])
+ fi
+ ])
+ ])