Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Hi! - does not work on any Linux install Well, it works for me, and decreses the file size by a few megs. (gcc 4.9.2) I'd suggest integrating this as optional feature, like -DLTO=yes. There is a lot of work being done on lto support, and will get better in the future. It is annoying if you want to compile project with LTO (because, say, you're working on a compiler and want to test new stuff), and the project can't easily be compile that way. I know, since I'm doing this (with firefox) and I do need to have some more wrappers to do it. Here are the results: krakonos@muskox ~ $ ls -all -h /home/krakonos/local-kicad-lto/bin/_* -rwxr-xr-x 1 krakonos krakonos 4.4M May 23 10:18 /home/krakonos/local-kicad-lto/bin/_cvpcb.kiface -rwxr-xr-x 1 krakonos krakonos 4.9M May 23 10:25 /home/krakonos/local-kicad-lto/bin/_eeschema.kiface -rwxr-xr-x 1 krakonos krakonos 2.1M May 23 10:26 /home/krakonos/local-kicad-lto/bin/_gerbview.kiface -rwxr-xr-x 1 krakonos krakonos 1.5M May 23 10:41 /home/krakonos/local-kicad-lto/bin/_pcb_calculator.kiface -rwxr-xr-x 1 krakonos krakonos 11M May 23 10:39 /home/krakonos/local-kicad-lto/bin/_pcbnew.kiface -rwxr-xr-x 1 krakonos krakonos 1.9M May 23 10:41 /home/krakonos/local-kicad-lto/bin/_pl_editor.kiface krakonos@muskox ~ $ ls -all -h /home/krakonos/local/bin/_* -rwxr-xr-x 1 krakonos krakonos 6.5M May 24 13:23 /home/krakonos/local/bin/_cvpcb.kiface -rwxr-xr-x 1 krakonos krakonos 6.9M May 24 13:23 /home/krakonos/local/bin/_eeschema.kiface -rwxr-xr-x 1 krakonos krakonos 2.9M May 24 13:21 /home/krakonos/local/bin/_gerbview.kiface -rwxr-xr-x 1 krakonos krakonos 2.1M May 24 13:22 /home/krakonos/local/bin/_pcb_calculator.kiface -rwxr-xr-x 1 krakonos krakonos 15M May 24 13:26 /home/krakonos/local/bin/_pcbnew.kiface -rwxr-xr-x 1 krakonos krakonos 2.6M May 24 13:22 /home/krakonos/local/bin/_pl_editor.kiface -- S pozdravem Ladislav Láska la...@kam.mff.cuni.cz Katedra Aplikované Matematiky, MFF UK tel.: +420 739 464 167 ___ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Le 24/05/2015 00:04, Simon Richter a écrit : Hi, On 23.05.2015 20:18, jp charras wrote: Sorry to say that, but what is the interest of this work: Now that is a good question. My initial goal was to basically shave a few percents off in text size and get a bit of extra speed, just by setting a few compiler flags. I understand. I'm happy to put this on the back burner, because it isn't worth investing a lot of effort into it, but it'd be one item off my list. Make sense: it is more tricky as expected! - You said in a previous mail the link time is longer with LTO than without LT0, and this is a serious issue for developers (the compil time is often short when editing a few sources, so a longer link time is an issue) It's only enabled for Release builds -- it relies on the optimizer actually doing something anyway, so Debug builds should be unaffected. Simon -- Jean-Pierre CHARRAS ___ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Hi, On 23.05.2015 20:18, jp charras wrote: Sorry to say that, but what is the interest of this work: Now that is a good question. My initial goal was to basically shave a few percents off in text size and get a bit of extra speed, just by setting a few compiler flags. I'm happy to put this on the back burner, because it isn't worth investing a lot of effort into it, but it'd be one item off my list. - You said in a previous mail the link time is longer with LTO than without LT0, and this is a serious issue for developers (the compil time is often short when editing a few sources, so a longer link time is an issue) It's only enabled for Release builds -- it relies on the optimizer actually doing something anyway, so Debug builds should be unaffected. Simon signature.asc Description: OpenPGP digital signature ___ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Hi again,
last comment/test:
Just dropping in “-flto” in CMakeLists.txt here:
set( CMAKE_CXX_FLAGS_DEBUG -g3 -ggdb3 -DDEBUG
-Wno-deprecated-declarations )
set( CMAKE_C_FLAGS_RELEASE ${CMAKE_C_FLAGS_RELEASE} -DNDEBUG -flto )
set( CMAKE_CXX_FLAGS_RELEASE ${CMAKE_CXX_FLAGS_RELEASE} -DNDEBUG -flto )
if( GXX_HAS_VISIBILITY_FLAG AND NOT APPLE )
I had to remove -fno-fat-lto-objects” since clang didn’t like it and
immediately bailed out.
At least this proved that above change did make a difference.
This time I compiled the exact same version and it also doesn’t seem to have
any real effect:
bstegmaier$ ls -al KiCad-5678/kicad.app/Contents/PlugIns/
total 57288
drwxr-xr-x 8 bstegmaier staff 272 23 Mai 18:49 .
drwxr-xr-x 9 bstegmaier staff 306 23 Mai 18:49 ..
-rwxr-xr-x 1 bstegmaier staff 5222076 23 Mai 18:49 _cvpcb.kiface
-rwxr-xr-x 1 bstegmaier staff 5642208 23 Mai 18:49 _eeschema.kiface
-rwxr-xr-x 1 bstegmaier staff 2109340 23 Mai 18:49 _gerbview.kiface
-rwxr-xr-x 1 bstegmaier staff 1801528 23 Mai 18:49 _pcb_calculator.kiface
-rwxr-xr-x 1 bstegmaier staff 12606536 23 Mai 18:49 _pcbnew.kiface
-rwxr-xr-x 1 bstegmaier staff 1944760 23 Mai 18:49 _pl_editor.kiface
bstegmaier$ ls -al bin/kicad.app/Contents/PlugIns/
total 58560
drwxr-xr-x 8 bstegmaier staff 272 23 Mai 19:10 .
drwxr-xr-x 9 bstegmaier staff 306 23 Mai 19:10 ..
-rwxr-xr-x 1 bstegmaier staff 5317400 23 Mai 19:10 _cvpcb.kiface
-rwxr-xr-x 1 bstegmaier staff 5776284 23 Mai 19:10 _eeschema.kiface
-rwxr-xr-x 1 bstegmaier staff 2143724 23 Mai 19:10 _gerbview.kiface
-rwxr-xr-x 1 bstegmaier staff 1801776 23 Mai 19:10 _pcb_calculator.kiface
-rwxr-xr-x 1 bstegmaier staff 12948516 23 Mai 19:10 _pcbnew.kiface
-rwxr-xr-x 1 bstegmaier staff 1979112 23 Mai 19:10 _pl_editor.kiface
First one without “-flto”, second one with (yes, really… binaries are bigger
with it?).
Regards,
Bernhard
On 23.05.2015, at 18:48, Bernhard Stegmaier stegma...@sw-systems.de wrote:
Hi again,
I guess this is due to LTO not even being used on OS X, if I understand your
cmake change correctly:
find_program(CMAKE_GCC_AR NAMES
${_CMAKE_TOOLCHAIN_PREFIX}gcc-ar${_CMAKE_TOOLCHAIN_SUFFIX} HINTS
${_CMAKE_TOOLCHAIN_LOCATION})
find_program(CMAKE_GCC_NM NAMES ${_CMAKE_TOOLCHAIN_PREFIX}gcc-nm
HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
find_program(CMAKE_GCC_RANLIB NAMES
${_CMAKE_TOOLCHAIN_PREFIX}gcc-ranlib HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
if( CMAKE_GCC_AR AND CMAKE_GCC_NM AND CMAKE_GCC_RANLIB )
On my OS X using clang there is nothing like *gcc-ar*… or any of the other
two.
Why do you have to change/set CMAKE_AR and the other two anyway?
Regards,
Bernhard
On 23.05.2015, at 18:23, Bernhard Stegmaier stegma...@sw-systems.de
mailto:stegma...@sw-systems.de wrote:
Hi,
built your branch on OS X.
Good thing is that build did work for me.
I just quickly fired up pcbnew and loaded an existing board… seems to work.
But, it doesn’t seem to have a real effect on code size (first one is my
current working version, second one your branch):
bstegmaier$ ls -al /Applications/KiCad-5648/kicad.app/Contents/PlugIns/
total 58904
drwxr-xr-x 8 bstegmaier admin 272 9 Mai 14:59 .
drwxr-xr-x 9 bstegmaier admin 306 9 Mai 14:59 ..
-rwxr-xr-x 1 bstegmaier admin 5683560 9 Mai 14:59 _cvpcb.kiface
-rwxr-xr-x 1 bstegmaier admin 5652288 9 Mai 14:59 _eeschema.kiface
-rwxr-xr-x 1 bstegmaier admin 2105068 9 Mai 14:59 _gerbview.kiface
-rwxr-xr-x 1 bstegmaier admin 1797432 9 Mai 14:59 _pcb_calculator.kiface
-rwxr-xr-x 1 bstegmaier admin 12970696 9 Mai 14:59 _pcbnew.kiface
-rwxr-xr-x 1 bstegmaier admin 1944576 9 Mai 14:59 _pl_editor.kiface
bstegmaier$ ls -al bin/kicad.app/Contents/PlugIns/
total 57128
drwxr-xr-x 8 bstegmaier staff 272 23 Mai 18:13 .
drwxr-xr-x 9 bstegmaier staff 306 23 Mai 18:13 ..
-rwxr-xr-x 1 bstegmaier staff 5215564 23 Mai 18:13 _cvpcb.kiface
-rwxr-xr-x 1 bstegmaier staff 5646432 23 Mai 18:13 _eeschema.kiface
-rwxr-xr-x 1 bstegmaier staff 2103556 23 Mai 18:13 _gerbview.kiface
-rwxr-xr-x 1 bstegmaier staff 1758640 23 Mai 18:13 _pcb_calculator.kiface
-rwxr-xr-x 1 bstegmaier staff 12570984 23 Mai 18:13 _pcbnew.kiface
-rwxr-xr-x 1 bstegmaier staff 1938952 23 Mai 18:13 _pl_editor.kiface
The comparison isn’t accurate in any way… both binaries do use different
KiCad revisions and the build of your branch is done without github plugin,
my working version is with github plugin.
Nevertheless… I think you would have expected a quite significant difference?
Regards,
Bernhard
On 22.05.2015, at 16:51, Simon Richter simon.rich...@hogyros.de
mailto:simon.rich...@hogyros.de wrote:
Hi,
I've submitted a branch for inclusion at
https://code.launchpad.net/~sjr/kicad/lto
https://code.launchpad.net/~sjr/kicad/lto
that seeks to
Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Hi, built your branch on OS X. Good thing is that build did work for me. I just quickly fired up pcbnew and loaded an existing board… seems to work. But, it doesn’t seem to have a real effect on code size (first one is my current working version, second one your branch): bstegmaier$ ls -al /Applications/KiCad-5648/kicad.app/Contents/PlugIns/ total 58904 drwxr-xr-x 8 bstegmaier admin 272 9 Mai 14:59 . drwxr-xr-x 9 bstegmaier admin 306 9 Mai 14:59 .. -rwxr-xr-x 1 bstegmaier admin 5683560 9 Mai 14:59 _cvpcb.kiface -rwxr-xr-x 1 bstegmaier admin 5652288 9 Mai 14:59 _eeschema.kiface -rwxr-xr-x 1 bstegmaier admin 2105068 9 Mai 14:59 _gerbview.kiface -rwxr-xr-x 1 bstegmaier admin 1797432 9 Mai 14:59 _pcb_calculator.kiface -rwxr-xr-x 1 bstegmaier admin 12970696 9 Mai 14:59 _pcbnew.kiface -rwxr-xr-x 1 bstegmaier admin 1944576 9 Mai 14:59 _pl_editor.kiface bstegmaier$ ls -al bin/kicad.app/Contents/PlugIns/ total 57128 drwxr-xr-x 8 bstegmaier staff 272 23 Mai 18:13 . drwxr-xr-x 9 bstegmaier staff 306 23 Mai 18:13 .. -rwxr-xr-x 1 bstegmaier staff 5215564 23 Mai 18:13 _cvpcb.kiface -rwxr-xr-x 1 bstegmaier staff 5646432 23 Mai 18:13 _eeschema.kiface -rwxr-xr-x 1 bstegmaier staff 2103556 23 Mai 18:13 _gerbview.kiface -rwxr-xr-x 1 bstegmaier staff 1758640 23 Mai 18:13 _pcb_calculator.kiface -rwxr-xr-x 1 bstegmaier staff 12570984 23 Mai 18:13 _pcbnew.kiface -rwxr-xr-x 1 bstegmaier staff 1938952 23 Mai 18:13 _pl_editor.kiface The comparison isn’t accurate in any way… both binaries do use different KiCad revisions and the build of your branch is done without github plugin, my working version is with github plugin. Nevertheless… I think you would have expected a quite significant difference? Regards, Bernhard On 22.05.2015, at 16:51, Simon Richter simon.rich...@hogyros.de wrote: Hi, I've submitted a branch for inclusion at https://code.launchpad.net/~sjr/kicad/lto that seeks to use link-time optimization when possible. We've already established that this is broken on MSYS, so I'm going to disable it there, while it does some good on Linux. This leaves MacOS. Could anyone try building a Release configuration both with and without this branch, and check that a) the build still works, and b) we get a significant reduction in size? Thanks, Simon ___ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp ___ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Hi again,
I guess this is due to LTO not even being used on OS X, if I understand your
cmake change correctly:
find_program(CMAKE_GCC_AR NAMES
${_CMAKE_TOOLCHAIN_PREFIX}gcc-ar${_CMAKE_TOOLCHAIN_SUFFIX} HINTS
${_CMAKE_TOOLCHAIN_LOCATION})
find_program(CMAKE_GCC_NM NAMES ${_CMAKE_TOOLCHAIN_PREFIX}gcc-nm HINTS
${_CMAKE_TOOLCHAIN_LOCATION})
find_program(CMAKE_GCC_RANLIB NAMES
${_CMAKE_TOOLCHAIN_PREFIX}gcc-ranlib HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
if( CMAKE_GCC_AR AND CMAKE_GCC_NM AND CMAKE_GCC_RANLIB )
On my OS X using clang there is nothing like *gcc-ar*… or any of the other two.
Why do you have to change/set CMAKE_AR and the other two anyway?
Regards,
Bernhard
On 23.05.2015, at 18:23, Bernhard Stegmaier stegma...@sw-systems.de wrote:
Hi,
built your branch on OS X.
Good thing is that build did work for me.
I just quickly fired up pcbnew and loaded an existing board… seems to work.
But, it doesn’t seem to have a real effect on code size (first one is my
current working version, second one your branch):
bstegmaier$ ls -al /Applications/KiCad-5648/kicad.app/Contents/PlugIns/
total 58904
drwxr-xr-x 8 bstegmaier admin 272 9 Mai 14:59 .
drwxr-xr-x 9 bstegmaier admin 306 9 Mai 14:59 ..
-rwxr-xr-x 1 bstegmaier admin 5683560 9 Mai 14:59 _cvpcb.kiface
-rwxr-xr-x 1 bstegmaier admin 5652288 9 Mai 14:59 _eeschema.kiface
-rwxr-xr-x 1 bstegmaier admin 2105068 9 Mai 14:59 _gerbview.kiface
-rwxr-xr-x 1 bstegmaier admin 1797432 9 Mai 14:59 _pcb_calculator.kiface
-rwxr-xr-x 1 bstegmaier admin 12970696 9 Mai 14:59 _pcbnew.kiface
-rwxr-xr-x 1 bstegmaier admin 1944576 9 Mai 14:59 _pl_editor.kiface
bstegmaier$ ls -al bin/kicad.app/Contents/PlugIns/
total 57128
drwxr-xr-x 8 bstegmaier staff 272 23 Mai 18:13 .
drwxr-xr-x 9 bstegmaier staff 306 23 Mai 18:13 ..
-rwxr-xr-x 1 bstegmaier staff 5215564 23 Mai 18:13 _cvpcb.kiface
-rwxr-xr-x 1 bstegmaier staff 5646432 23 Mai 18:13 _eeschema.kiface
-rwxr-xr-x 1 bstegmaier staff 2103556 23 Mai 18:13 _gerbview.kiface
-rwxr-xr-x 1 bstegmaier staff 1758640 23 Mai 18:13 _pcb_calculator.kiface
-rwxr-xr-x 1 bstegmaier staff 12570984 23 Mai 18:13 _pcbnew.kiface
-rwxr-xr-x 1 bstegmaier staff 1938952 23 Mai 18:13 _pl_editor.kiface
The comparison isn’t accurate in any way… both binaries do use different
KiCad revisions and the build of your branch is done without github plugin,
my working version is with github plugin.
Nevertheless… I think you would have expected a quite significant difference?
Regards,
Bernhard
On 22.05.2015, at 16:51, Simon Richter simon.rich...@hogyros.de
mailto:simon.rich...@hogyros.de wrote:
Hi,
I've submitted a branch for inclusion at
https://code.launchpad.net/~sjr/kicad/lto
https://code.launchpad.net/~sjr/kicad/lto
that seeks to use link-time optimization when possible.
We've already established that this is broken on MSYS, so I'm going to
disable it there, while it does some good on Linux. This leaves MacOS.
Could anyone try building a Release configuration both with and without
this branch, and check that a) the build still works, and b) we get a
significant reduction in size?
Thanks,
Simon
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Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Hi,
On 23.05.2015 18:48, Bernhard Stegmaier wrote:
I guess this is due to LTO not even being used on OS X, if I understand your
cmake change correctly:
find_program(CMAKE_GCC_AR NAMES
${_CMAKE_TOOLCHAIN_PREFIX}gcc-ar${_CMAKE_TOOLCHAIN_SUFFIX} HINTS
${_CMAKE_TOOLCHAIN_LOCATION})
find_program(CMAKE_GCC_NM NAMES ${_CMAKE_TOOLCHAIN_PREFIX}gcc-nm
HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
find_program(CMAKE_GCC_RANLIB NAMES
${_CMAKE_TOOLCHAIN_PREFIX}gcc-ranlib HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
if( CMAKE_GCC_AR AND CMAKE_GCC_NM AND CMAKE_GCC_RANLIB )
On my OS X using clang there is nothing like *gcc-ar*… or any of the other
two.
Why do you have to change/set CMAKE_AR and the other two anyway?
Indeed, it seems this fails on OS X, so it falls back to non-LTO.
This is needed because regular binutils ar/nm/ranlib fail to work with
the LTO objects generated by gcc, so gcc ships extra wrappers.
Presumably, the correct approach would be
- if MSYS, disable LTO (because it's broken)
- if gcc, look for gcc-ar/gcc-nm/gcc-ranlib
- if llvm, look for llvm-ar/llvm-nm/llvm-ranlib
- if no toolchain specific tools were found, try whether the regular
ones work.
I still have to look into the problems jp had on Ubuntu -- that
shouldn't happen.
For me, it's quite a bit of a size difference on gcc (25%).
without LTO:
-rwxr-xr-x 1 geier geier 14995616 Mai 23 18:56
textsize is 12950112
with LTO:
-rwxr-xr-x 1 geier geier 11152184 Mai 23 05:53 _pcbnew.kiface
textsize is 9422117
with LLVM, the effect is a bit more pronounced IIRC, but I'd need to
rebuild for actual numbers.
Simon
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Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Le 22/05/2015 16:51, Simon Richter a écrit : Hi, I've submitted a branch for inclusion at https://code.launchpad.net/~sjr/kicad/lto that seeks to use link-time optimization when possible. We've already established that this is broken on MSYS, so I'm going to disable it there, while it does some good on Linux. This leaves MacOS. Could anyone try building a Release configuration both with and without this branch, and check that a) the build still works, and b) we get a significant reduction in size? Thanks, Simon I am not a MacOS user, but to see what happens, I tested in on Linux Kubuntu 14.04 LTS: with this patch, the build process does not work. -- Jean-Pierre CHARRAS ___ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Le 23/05/2015 19:17, Simon Richter a écrit :
Hi,
On 23.05.2015 18:48, Bernhard Stegmaier wrote:
I guess this is due to LTO not even being used on OS X, if I
understand your cmake change correctly: find_program(CMAKE_GCC_AR
NAMES ${_CMAKE_TOOLCHAIN_PREFIX}gcc-ar${_CMAKE_TOOLCHAIN_SUFFIX}
HINTS ${_CMAKE_TOOLCHAIN_LOCATION}) find_program(CMAKE_GCC_NM
NAMES ${_CMAKE_TOOLCHAIN_PREFIX}gcc-nm HINTS
${_CMAKE_TOOLCHAIN_LOCATION}) find_program(CMAKE_GCC_RANLIB NAMES
${_CMAKE_TOOLCHAIN_PREFIX}gcc-ranlib HINTS
${_CMAKE_TOOLCHAIN_LOCATION})
if( CMAKE_GCC_AR AND CMAKE_GCC_NM AND CMAKE_GCC_RANLIB ) On my OS
X using clang there is nothing like *gcc-ar*… or any of the other
two. Why do you have to change/set CMAKE_AR and the other two
anyway?
Indeed, it seems this fails on OS X, so it falls back to non-LTO.
This is needed because regular binutils ar/nm/ranlib fail to work
with the LTO objects generated by gcc, so gcc ships extra
wrappers.
Presumably, the correct approach would be
- if MSYS, disable LTO (because it's broken) - if gcc, look for
gcc-ar/gcc-nm/gcc-ranlib - if llvm, look for
llvm-ar/llvm-nm/llvm-ranlib - if no toolchain specific tools were
found, try whether the regular ones work.
I still have to look into the problems jp had on Ubuntu -- that
shouldn't happen.
For me, it's quite a bit of a size difference on gcc (25%).
without LTO: -rwxr-xr-x 1 geier geier 14995616 Mai 23 18:56
textsize is 12950112
with LTO: -rwxr-xr-x 1 geier geier 11152184 Mai 23 05:53
_pcbnew.kiface
textsize is 9422117
with LLVM, the effect is a bit more pronounced IIRC, but I'd need
to rebuild for actual numbers.
Simon
Simon,
Sorry to say that, but what is the interest of this work:
- LTO is not usable on mingw
- looks not very useful on OSX
- does not work on any Linux install
- binaries are slightly smaller, but the full diff is something like
20 Mbytes or less (according to the info in your mail), and a full
Kicad install (with docs, libs, 3D shapes...) is at least 300 Mbytes
(800 Mbytes on Windows, with python, wxWidgets and some other libs).
And smaller binaries does not mean faster execution time (this is
often the opposite)
- You said in a previous mail the link time is longer with LTO than
without LT0, and this is a serious issue for developers (the compil time
is often short when editing a few sources, so a longer link time is an
issue)
Thanks.
--
Jean-Pierre CHARRAS
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Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Will that speed up the building process also? Mario Luzeiro From: Kicad-developers [kicad-developers-bounces+mrluzeiro=ua...@lists.launchpad.net] on behalf of Simon Richter [simon.rich...@hogyros.de] Sent: 22 May 2015 16:51 To: KiCad Developers Subject: [Kicad-developers] [MacOS] compiling with link-time optimization Hi, I've submitted a branch for inclusion at https://code.launchpad.net/~sjr/kicad/lto that seeks to use link-time optimization when possible. We've already established that this is broken on MSYS, so I'm going to disable it there, while it does some good on Linux. This leaves MacOS. Could anyone try building a Release configuration both with and without this branch, and check that a) the build still works, and b) we get a significant reduction in size? Thanks, Simon ___ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
Re: [Kicad-developers] [MacOS] compiling with link-time optimization
Hi, Will that speed up the building process also? It might, a tiny bit, but in my experience it was mostly neutral, as the savings from the shorter compiler invocations were eaten up because now the linker took a lot more time. Simon signature.asc Description: OpenPGP digital signature ___ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
