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m4: introduce st_SAVE_VAR and st_RESTORE_VAR macros

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These new macros are going to be needed for the upcoming
AX_PROG_CC_FOR_BUILD change.

* m4/st_save_restore_var.m4: New file.
This commit is contained in:
Дмитрий Левин 2016-12-07 10:58:24 +00:00
parent 5c20f4aac4
commit c26d031c1f
1 changed files with 7 additions and 0 deletions
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m4/st_save_restore_var.m4 Normal file
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AC_DEFUN([st_SAVE_VAR], [dnl
AS_IF([test -n "${$1+set}"], [st_saved_$1="${$1}"; unset $1])
])
AC_DEFUN([st_RESTORE_VAR], [dnl
AS_IF([test -n "${st_saved_$1+set}"], [$1="${st_saved_$1}"; unset st_saved_$1])
])