perfetto: switch to C++17 with temporary C++11 opt-out
* make all targets build with C++17
* make it an error to compile with C++11 without defining an opt-out
flag. The error makes it clear that any objections need to be
discussed very soon
* Keep the debug CI bot compiling with C++11 to prevent accidental
use of C++14/17 features in the transition period
Bug: b/257064316
Change-Id: I32c227944f9d65a110d4f613b1ea17a823567822
diff --git a/gn/standalone/BUILD.gn b/gn/standalone/BUILD.gn
index 0d17328..192bee8 100644
--- a/gn/standalone/BUILD.gn
+++ b/gn/standalone/BUILD.gn
@@ -111,6 +111,10 @@
}
config("c++11") {
+ if (!perfetto_cpp11_until_q1_2023) {
+ visibility = []
+ }
+
# C++11 is the default on Windows.
if (!is_win) {
cflags_cc = [ "-std=c++11" ]
@@ -118,11 +122,16 @@
# Enable standards-conforming compiler behavior.
cflags_cc = [ "/permissive-" ]
}
+ defines = [ "PERFETTO_ALLOW_SUB_CPP17" ]
}
# Used in buildtools dependencies for standalone builds.
config("c++14") {
- visibility = [ "//buildtools:llvm_demangle" ]
+ if (perfetto_cpp11_until_q1_2023) {
+ visibility = [ "//buildtools:llvm_demangle" ]
+ } else {
+ visibility = []
+ }
if (is_win) {
cflags_cc = [ "/std:c++14" ]
} else {
@@ -132,7 +141,9 @@
# Used in buildtools dependencies for standalone builds.
config("c++17") {
- visibility = [ "//buildtools:libunwindstack" ]
+ if (perfetto_cpp11_until_q1_2023) {
+ visibility = [ "//buildtools:libunwindstack" ]
+ }
if (is_win) {
cflags_cc = [ "/std:c++17" ]
} else {
@@ -196,6 +207,7 @@
"/Gy", # Enable function-level linking.
"/FS", # Preserve previous PDB behavior.
"/utf-8", # Assume UTF-8 by default to avoid code page dependencies.
+ "/Zc:__cplusplus", # Allow use of __cplusplus macro.
]
defines += [
"_CRT_NONSTDC_NO_WARNINGS",
