From 7ae73da23ad998bd1e63ad213cf7a02e61191951 Mon Sep 17 00:00:00 2001
From: Romain Naour <romain.naour@gmail.com>
Date: Sat, 23 May 2020 19:01:19 +0200
Subject: [PATCH] gn.pro: don't link statically with libstc++
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While cross-compiling, qt5webengine is building a host tool but
want to link the libstdc++ statically. This requires to install
libstdc++-static package on the host (Fedora package name).

Otherwise the link fail with:

  [185/185] LINK gn
  FAILED: gn
  /usr/bin/g++ -O3 -fdata-sections -ffunction-sections -Wl,--gc-sections -Wl,-strip-all -Wl,--as-needed -static-libstdc++ -pthread -o gn -Wl,--start-group tools/gn/gn_main.o base.a gn_lib.a -Wl,--end-group -ldl
  /usr/bin/ld : unable to find -lstdc++
  [...]
  Project ERROR: GN build error!

Add --no-static-libstdc++ argument to gn.pro to link to
libstdc++.so.6 instead of libstdc++.a.

--no-static-libstdc++ has been added by [1] but it force
linking statically by default.

[1] https://github.com/qt/qtwebengine-chromium/commit/cfab9198a9917f42cf08b1caf84ab9b71aac1911#diff-905c8f054808213577c0a92d1b704615

Signed-off-by: Romain Naour <romain.naour@gmail.com>
---
 src/buildtools/gn.pro | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/buildtools/gn.pro b/src/buildtools/gn.pro
index 033202e6..5dd8e241 100644
--- a/src/buildtools/gn.pro
+++ b/src/buildtools/gn.pro
@@ -20,7 +20,8 @@ build_pass|!debug_and_release {
 
             gn_gen_args = --no-last-commit-position --out-path $$out_path \
                           --cc \"$$which($$QMAKE_CC)\" --cxx \"$$which($$QMAKE_CXX)\" \
-                          --ld \"$$which($$QMAKE_LINK)\"
+                          --ld \"$$which($$QMAKE_LINK)\" \
+                          --no-static-libstdc++
 
             msvc:!clang_cl: gn_gen_args += --use-lto
 
-- 
2.25.4