| author | Oleksandr Gavenko <gavenkoa@gmail.com> |
| Sat, 10 Feb 2018 01:30:24 +0200 | |
| changeset 2228 | 837f1337c59b |
| parent 1912 | 8b81a8f0f692 |
| child 2230 | 9e6ad6607a9e |
| permissions | -rw-r--r-- |
|
1905
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
1 |
.. -*- coding: utf-8; -*- |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
2 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
3 |
===== |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
4 |
GCC |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
5 |
===== |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
6 |
.. contents:: |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
7 |
:local: |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
8 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
9 |
Remove dead code |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
10 |
================ |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
11 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
12 |
STRIP_DEAD_CODE = -Wl,-static -fvtable-gc -fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,-s |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
13 |
|
|
2228
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
14 |
``-Wl,-static`` |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
15 |
Link against static libraries. Required for dead-code |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
16 |
elimination. |
|
1905
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
17 |
|
|
2228
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
18 |
``-fvtable-gc`` |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
19 |
C++ virtual method table instrumented with garbage collection |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
20 |
information for the linker. |
|
1905
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
21 |
|
|
2228
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
22 |
``-fdata-sections`` |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
23 |
Keeps data in separate data sections, so they can be discarded |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
24 |
if unused. |
|
1905
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
25 |
|
|
2228
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
26 |
``-ffunction-sections`` |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
27 |
Keeps funcitons in separate data sections, so they can be |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
28 |
discarded if unused. |
|
1905
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
29 |
|
|
2228
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
30 |
``-Wl,--gc-sections`` |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
31 |
Tell the linker to garbage collect and discard unused |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
32 |
sections. |
|
1905
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
33 |
|
|
2228
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
34 |
``-s`` |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
35 |
Strip the debug information, so as to make the code as small |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
36 |
as possible. (I presume that you'd want to do this in a |
|
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
37 |
dead-code removal build.) |
|
1905
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
38 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
39 |
Map file |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
40 |
======== |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
41 |
:: |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
42 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
43 |
$ ld -Map=file.map <opts> <files> |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
44 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
45 |
or:: |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
46 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
47 |
$ gcc -Wl,-Map=file.map <opts> <files> |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
48 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
49 |
Predefined macros |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
50 |
================= |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
51 |
:: |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
52 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
53 |
$ gcc -arch ppc -dM -E - < /dev/null | sort |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
54 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
55 |
Default search path |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
56 |
=================== |
|
2228
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
57 |
:: |
|
1905
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
58 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
59 |
$ echo | gcc -v -x c -E - |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
60 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
61 |
$ gcc -print-search-dirs |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
62 |
install: ... |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
63 |
programs: ... |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
64 |
libraries: ... |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
65 |
|
|
2228
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
66 |
Use ``-###`` in actual invoking:: |
|
1905
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
67 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
68 |
$ gcc -### -o foo foo.c |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
69 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
70 |
$ ld --verbose | grep SEARCH_DIR |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
71 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
72 |
``LIBRARY_PATH`` and ``LD_LIBRARY_PATH``:: |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
73 |
|
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
74 |
$ cpp -Wp,-v |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
75 |
$ cpp -Wp,-lang-c++,-v |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
76 |
$ cpp -x c++ -Wp,-v |
|
fba288d59662
Include only local subsections into TOC. This prevent duplication of
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
diff
changeset
|
77 |