Add GN build file for OpenSSL.

Add GN build file for OpenSSL.

This sluprs in the existing .gypi file to more easily keep the builds in sync.

TBR=rsleevi@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=263283

[brettw, 2014-04-11 17:57:59]

Carrying over LGTM from https://codereview.chromium.org/232563008/

[brettw, 2014-04-11 17:58:27]

Committed patchset #1 manually as r263283 (presubmit successful).

[Ryan Sleevi, 2014-04-11 17:58:56]

lgtm

[tfarina, 2014-04-11 18:19:36]

https://codereview.chromium.org/234833005/diff/1/BUILD.gn
File BUILD.gn (right):

https://codereview.chromium.org/234833005/diff/1/BUILD.gn#newcode22
BUILD.gn:22: # The list of OpenSSL files is kept in skia_gn_files.gypi. Read it.
skia_gn_files.gypi? I think you meant openssl.gypi

[brettw, 2014-04-11 21:42:15]

On 2014/04/11 18:19:36, tfarina wrote:
> https://codereview.chromium.org/234833005/diff/1/BUILD.gn
> File BUILD.gn (right):
> 
> https://codereview.chromium.org/234833005/diff/1/BUILD.gn#newcode22
> BUILD.gn:22: # The list of OpenSSL files is kept in skia_gn_files.gypi. Read
it.
> skia_gn_files.gypi? I think you meant openssl.gypi

Thanks, I checked in a fix for this typo upstream. Probably won't bother pulling
deps for now.

[tfarina, 2014-04-12 02:40:35]

https://codereview.chromium.org/234833005/diff/1/BUILD.gn
File BUILD.gn (right):

https://codereview.chromium.org/234833005/diff/1/BUILD.gn#newcode81
BUILD.gn:81: cflags += [
../../third_party/openssl/openssl/crypto/ec/ec_lib.c:71:19: error: unused
variable 'EC_version' [-Werror,-Wunused-const-variable]
static const char EC_version[] = "EC" OPENSSL_VERSION_PTEXT;
                  ^

Do we need -Wno-unused-const-variable here too?

[brettw, 2014-04-12 04:41:49]

https://codereview.chromium.org/234833005/diff/1/BUILD.gn
File BUILD.gn (right):

https://codereview.chromium.org/234833005/diff/1/BUILD.gn#newcode81
BUILD.gn:81: cflags += [
Which platform are you compiling on? It worked for me on Linux.

[tfarina, 2014-04-12 04:48:12]

https://codereview.chromium.org/234833005/diff/1/BUILD.gn
File BUILD.gn (right):

https://codereview.chromium.org/234833005/diff/1/BUILD.gn#newcode81
BUILD.gn:81: cflags += [
On 2014/04/12 04:41:49, brettw wrote:
> Which platform are you compiling on? It worked for me on Linux. 

Try building with clang, it works with gcc though. I'm building on Linux x64 as
well.

$ gn gen out/Release_gn --args="is_debug=false is_clang=true"