solenv/gbuild/platform/com_GCC_defs.mk |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

New commits:
commit f9ba4c2be1c1514553050fea37c48b757a68d4fd
Author:     Stephan Bergmann <sberg...@redhat.com>
AuthorDate: Sun Nov 25 13:34:10 2018 +0100
Commit:     Stephan Bergmann <sberg...@redhat.com>
CommitDate: Sun Nov 25 15:50:45 2018 +0100

    Generally set CCACHE_CPP2 for --enable-werror GCC
    
    This obsoletes <https://gerrit.libreoffice.org/plugins/gitiles/lode/+/
    b82e0a9d26ef4c81046c053ff831dccfc84c56be%5E!> "For linux_gcc_release_64, 
don't
    let ccache strip comments" and fixes ccache for all builds using (recent) 
GCC.
    
    Change-Id: I5fd20b2565f57073c545fe5d3a9639c2c0583a74
    Reviewed-on: https://gerrit.libreoffice.org/63979
    Tested-by: Jenkins
    Reviewed-by: Stephan Bergmann <sberg...@redhat.com>

diff --git a/solenv/gbuild/platform/com_GCC_defs.mk 
b/solenv/gbuild/platform/com_GCC_defs.mk
index 057ef8fd5762..4875759e06e2 100644
--- a/solenv/gbuild/platform/com_GCC_defs.mk
+++ b/solenv/gbuild/platform/com_GCC_defs.mk
@@ -251,8 +251,14 @@ gb_COMPILER_PLUGINS_SETUP := 
ICECC_EXTRAFILES=$(SRCDIR)/include/sal/log-areas.do
 gb_COMPILER_PLUGINS_WARNINGS_AS_ERRORS := \
     -Xclang -plugin-arg-loplugin -Xclang --warnings-as-errors
 else
-gb_COMPILER_TEST_FLAGS :=
+# Set CCACHE_CPP2 to prevent GCC -Werror=implicit-fallthrough= when ccache 
strips comments from C
+# code (which still needs /*fallthrough*/-style comments to silence that 
warning):
+ifeq ($(ENABLE_WERROR),TRUE)
+gb_COMPILER_SETUP := CCACHE_CPP2=1
+else
 gb_COMPILER_SETUP :=
+endif
+gb_COMPILER_TEST_FLAGS :=
 gb_COMPILER_PLUGINS :=
 gb_COMPILER_PLUGINS_SETUP :=
 gb_COMPILER_PLUGINS_WARNINGS_AS_ERRORS :=
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