From f64e2d2daa64749995253f8ad00679ce74abdc1b Mon Sep 17 00:00:00 2001
From: Jose Dapena Paz <jdapena@igalia.com>
Date: Wed, 19 Aug 2020 11:02:00 +0200
Subject: [PATCH] GCC: ConsumeDurationNumber cannot be a constexpr

Declaring base::ConsumeDurationNumber as constexpr is not valid, as it
uses the BasicStringPiece::begin method, that is not constexpr.

build error in GCC:
../../base/time/time.cc: In function ‘constexpr base::Optional<base::{anonymous}::ParsedDecimal> base::{anonymous}::ConsumeDurationNumber(base::StringPiece&)’:
../../base/time/time.cc:67:63: error: call to non-‘constexpr’ function ‘const value_type* base::BasicStringPiece<STRING_TYPE>::begin() const [with STRING_TYPE = std::__cxx11::basic_string<char>; base::BasicStringPiece<STRING_TYPE>::const_iterator = const char*; base::BasicStringPiece<STRING_TYPE>::value_type = char]’
   67 |   StringPiece::const_iterator orig_start = number_string.begin();
      |                                            ~~~~~~~~~~~~~~~~~~~^~

Bug: 859294
Change-Id: Id987d003f66052848d7083bb33abc3acfd109b73
---

diff --git a/base/time/time.cc b/base/time/time.cc
index 1b1a830..7c47419 100644
--- a/base/time/time.cc
+++ b/base/time/time.cc
@@ -61,8 +61,7 @@
 //
 // Adapted from absl:
 // https://cs.chromium.org/chromium/src/third_party/abseil-cpp/absl/time/duration.cc?l=807&rcl=2c22e9135f107a4319582ae52e2e3e6b201b6b7c
-constexpr Optional<ParsedDecimal> ConsumeDurationNumber(
-    StringPiece& number_string) {
+Optional<ParsedDecimal> ConsumeDurationNumber(StringPiece& number_string) {
   ParsedDecimal res;
   StringPiece::const_iterator orig_start = number_string.begin();
   // Parse contiguous digits.