Re: Update: Minimal libcurl compile for Windows; Missing flags?

On Thu, May 7, 2020 at 6:46 PM Testing WunTuTri via curl-library
<curl-library_at_cool.haxx.se> wrote:
>
> old thread: https://curl.haxx.se/mail/lib-2020-05/0021.html
>
> Hey folks,
>
> So I decided to fully commit to the Microsoft compiler, and figure out the flags on the go which disable features I don't need. (99% of them basically)
>
> My steps so far:
> (inside the x64 native tools console on windows)
> winbuild dir:
> 1.
> SET CC=cl /DHTTP_ONLY /DCURL_DISABLE_COOKIES /DCURL_DISABLE_CRYPTO_AUTH /DCURL_DISABLE_VERBOSE_STRINGS /DCURL_DISABLE_DICT /DCURL_DISABLE_FILE /DCURL_DISABLE_MIME /DCURL_DISABLE_HTTP_AUTH /DCURL_DISABLE_PARSEDATE /DCURL_DISABLE_DOH /DCURL_DISABLE_SHUFFLE_DNS /DCURL_DISABLE_PROGRESS_METER /DCURL_DISABLE_LIBCURL_OPTION /DCURL_DISABLE_OPENSSL_AUTO_LOAD_CONFIG /DCURL_DISABLE_NETRC
>
> 2.
> nmake /f Makefile.vc mode=static ENABLE_SSPI=no ENABLE_IPV6=no ENABLE_IDN=no ENABLE_WINSSL=no GEN_PDB=no DEBUG=no MACHINE=x64
>
> This yields libcurl_a.lib which is 718kb in size(2x smaller than the default compile), WHICH ALSO WORKS for my project!! Thanks to Ray Satiro
>
> I've tried grep searches on the root curl-7.70.0 folder;
>
> grep -r -i "CURL_DISABLE_" .
>
> But I haven't found anything that I already haven't used. Since documentation says I can make my lib as small as 90kb I guess I'm still missing something.
> This can also be seen by comparing MINGW additional .configure flags to the MSVC flags, which I haven't found
>
> ./configure --disable-ares --disable-ipv6 --disable-manual --disable-verbose --disable-versioned-symbols --enable-symbol-hiding --without-libidn --without-librtmp --without-ssl --without-zlib --without-libidn2 --disable-pthreads --without-libmetalink --disable-unix-sockets --without-strerror --disable-warnings
>
> So my question would be, do you fine folks know if there are any more MSVC flags I could use to make the static library even smaller?

Typically you don't worry about the static library size. It can be as
big or as small as it needs to be.

If you are worried about the final executable size after linking, then
you allow the linker to discard unused symbols. Below are the options
to do it.

Using GCC on Linux:

  CFLAGS= -ffunction-sections -fdata-sections
  LDFLAGS= -Wl,--gc-sections -Wl,--exclude-libs,ALL

Using Clang on OS X:

  CFLAGS= -ffunction-sections -fdata-sections
  LDFLAGS= -Wl,-dead_strip

Using MSVC:

  CFLAGS= /Gy
  LDFLAGS=/OPT:REF

Jeff

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Received on 2020-05-08