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体验新版 GitCode,发现更多精彩内容 >>
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a4199b45
编写于
4月 24, 2020
作者:
V
Vadim Petrochenkov
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差异文件
rustc-book: Document `-C relocation-model`
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-5
src/doc/rustc/src/codegen-options/index.md
src/doc/rustc/src/codegen-options/index.md
+39
-4
src/librustc_session/options.rs
src/librustc_session/options.rs
+2
-1
未找到文件。
src/doc/rustc/src/codegen-options/index.md
浏览文件 @
a4199b45
...
@@ -319,11 +319,46 @@ to a valid `.profdata` file. See the chapter on
...
@@ -319,11 +319,46 @@ to a valid `.profdata` file. See the chapter on
## relocation-model
## relocation-model
This option lets you choose which
This option controls generation of
[
relocation
](
https://en.wikipedia.org/wiki/Relocation_\(computing\
)
) model to
[
position-independent code (PIC)
](
https://en.wikipedia.org/wiki/Position-independent_code
)
.
use.
To find the valid options for this flag, run
`rustc --print relocation-models`
.
Supported values for this option are:
#### Primary relocation models
-
`static`
- non-relocatable code, machine instructions may use absolute addressing modes.
-
`pic`
- fully relocatable position independent code,
machine instructions need to use relative addressing modes.
Equivalent to the "uppercase"
`-fPIC`
or
`-fPIE`
options in other compilers,
depending on the produced crate types.
This is the default model for majority of supported targets.
#### Special relocation models
-
`dynamic-no-pic`
- relocatable external references, non-relocatable code.
Only makes sense on Darwin and is rarely used.
If StackOverflow tells you to use this as an opt-out of PIC or PIE, don't believe it,
use
`-C relocation-model=static`
instead.
-
`ropi`
,
`rwpi`
and
`ropi-rwpi`
- relocatable code and read-only data, relocatable read-write data,
and combination of both, respectively.
Only makes sense for certain embedded ARM targets.
-
`default`
- relocation model default to the current target.
Only makes sense as an override for some other explicitly specified relocation model
previously set on the command line.
Supported values can also be discovered by running
`rustc --print relocation-models`
.
#### Linking effects
In addition to codegen effects,
`relocation-model`
has effects during linking.
If the relocation model is
`pic`
and the current target supports position-independent executables
(PIE), the linker will be instructed (
`-pie`
) to produce one.
If the target doesn't support both position-independent and statically linked executables,
then
`-C target-feature=+crt-static`
"wins" over
`-C relocation-model=pic`
,
and the linker is instructed (
`-static`
) to produce a statically linked
but not position-independent executable.
## remark
## remark
...
...
src/librustc_session/options.rs
浏览文件 @
a4199b45
...
@@ -706,7 +706,8 @@ fn parse_src_file_hash(slot: &mut Option<SourceFileHashAlgorithm>, v: Option<&st
...
@@ -706,7 +706,8 @@ fn parse_src_file_hash(slot: &mut Option<SourceFileHashAlgorithm>, v: Option<&st
profile_use
:
Option
<
PathBuf
>
=
(
None
,
parse_opt_pathbuf
,
[
TRACKED
],
profile_use
:
Option
<
PathBuf
>
=
(
None
,
parse_opt_pathbuf
,
[
TRACKED
],
"use the given `.profdata` file for profile-guided optimization"
),
"use the given `.profdata` file for profile-guided optimization"
),
relocation_model
:
Option
<
RelocModel
>
=
(
None
,
parse_relocation_model
,
[
TRACKED
],
relocation_model
:
Option
<
RelocModel
>
=
(
None
,
parse_relocation_model
,
[
TRACKED
],
"choose the relocation model to use (`rustc --print relocation-models` for details)"
),
"control generation of position-independent code (PIC)
\
(`rustc --print relocation-models` for details)"
),
remark
:
Passes
=
(
Passes
::
Some
(
Vec
::
new
()),
parse_passes
,
[
UNTRACKED
],
remark
:
Passes
=
(
Passes
::
Some
(
Vec
::
new
()),
parse_passes
,
[
UNTRACKED
],
"print remarks for these optimization passes (space separated, or
\"
all
\"
)"
),
"print remarks for these optimization passes (space separated, or
\"
all
\"
)"
),
rpath
:
bool
=
(
false
,
parse_bool
,
[
UNTRACKED
],
rpath
:
bool
=
(
false
,
parse_bool
,
[
UNTRACKED
],
...
...
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