with_makevars {withr} | R Documentation |
Makevars variables
Description
Temporarily change contents of an existing Makevars
file.
Usage
with_makevars(
new,
code,
path = makevars_user(),
assignment = c("=", ":=", "?=", "+=")
)
local_makevars(
.new = list(),
...,
.path = makevars_user(),
.assignment = c("=", ":=", "?=", "+="),
.local_envir = parent.frame()
)
Arguments
new , .new |
|
code |
|
path , .path |
|
assignment , .assignment |
|
... |
Additional new variables and their values. |
.local_envir |
|
Details
If no Makevars
file exists or the fields in new
do
not exist in the existing Makevars
file then the fields are added to
the new file. Existing fields which are not included in new
are
appended unchanged. Fields which exist in Makevars
and in new
are modified to use the value in new
.
Value
[any]
The results of the evaluation of the code
argument.
See Also
withr
for examples
Examples
writeLines("void foo(int* bar) { *bar = 1; }\n", "foo.c")
system("R CMD SHLIB --preclean -c foo.c")
with_makevars(c(CFLAGS = "-O3"), system("R CMD SHLIB --preclean -c foo.c"))
unlink(c("foo.c", "foo.so"))
[Package withr version 3.0.0 Index]