13 files changed, 44 insertions, 1 deletions
diff --git a/test/lint/commit-script-check.sh b/test/lint/commit-script-check.sh
index 1c9dbc7f68..f1327469f3 100755
--- a/test/lint/commit-script-check.sh
+++ b/test/lint/commit-script-check.sh
@@ -11,6 +11,7 @@
 # The resulting script should exactly transform the previous commit into the current
 # one. Any remaining diff signals an error.
 
+export LC_ALL=C
 if test "x$1" = "x"; then
     echo "Usage: $0 <commit>..."
     exit 1
diff --git a/test/lint/git-subtree-check.sh b/test/lint/git-subtree-check.sh
index 184951715e..85e8b841b6 100755
--- a/test/lint/git-subtree-check.sh
+++ b/test/lint/git-subtree-check.sh
@@ -3,6 +3,7 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+export LC_ALL=C
 DIR="$1"
 COMMIT="$2"
 if [ -z "$COMMIT" ]; then
diff --git a/test/lint/lint-all.sh b/test/lint/lint-all.sh
index b6d86959c6..c9d4ec7199 100755
--- a/test/lint/lint-all.sh
+++ b/test/lint/lint-all.sh
@@ -7,6 +7,10 @@
 # This script runs all contrib/devtools/lint-*.sh files, and fails if any exit
 # with a non-zero status code.
 
+# This script is intentionally locale dependent by not setting "export LC_ALL=C"
+# in order to allow for the executed lint scripts to opt in or opt out of locale
+# dependence themselves.
+
 set -u
 
 SCRIPTDIR=$(dirname "${BASH_SOURCE[0]}")
diff --git a/test/lint/lint-include-guards.sh b/test/lint/lint-include-guards.sh
index 6a0dd556bb..ea791b0176 100755
--- a/test/lint/lint-include-guards.sh
+++ b/test/lint/lint-include-guards.sh
@@ -6,6 +6,7 @@
 #
 # Check include guards.
 
+export LC_ALL=C
 HEADER_ID_PREFIX="BITCOIN_"
 HEADER_ID_SUFFIX="_H"
 
diff --git a/test/lint/lint-includes.sh b/test/lint/lint-includes.sh
index f5daf4f9ac..03350576a7 100755
--- a/test/lint/lint-includes.sh
+++ b/test/lint/lint-includes.sh
@@ -8,6 +8,7 @@
 # Guard against accidental introduction of new Boost dependencies.
 # Check includes: Check for duplicate includes. Enforce bracket syntax includes.
 
+export LC_ALL=C
 IGNORE_REGEXP="/(leveldb|secp256k1|univalue)/"
 
 filter_suffix() {
diff --git a/test/lint/lint-locale-dependence.sh b/test/lint/lint-locale-dependence.sh
index 3144f2c841..98814ce4b9 100755
--- a/test/lint/lint-locale-dependence.sh
+++ b/test/lint/lint-locale-dependence.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 
+export LC_ALL=C
 KNOWN_VIOLATIONS=(
     "src/base58.cpp:.*isspace"
     "src/bitcoin-tx.cpp.*stoul"
diff --git a/test/lint/lint-logs.sh b/test/lint/lint-logs.sh
index 35be13ec19..89e7fb8764 100755
--- a/test/lint/lint-logs.sh
+++ b/test/lint/lint-logs.sh
@@ -12,7 +12,7 @@
 # There are some instances of LogPrintf() in comments. Those can be
 # ignored
 
-
+export LC_ALL=C
 UNTERMINATED_LOGS=$(git grep --extended-regexp "LogPrintf?\(" -- "*.cpp" | \
     grep -v '\\n"' | \
     grep -v "/\* Continued \*/" | \
diff --git a/test/lint/lint-python-shebang.sh b/test/lint/lint-python-shebang.sh
index f5c5971c03..031487a91a 100755
--- a/test/lint/lint-python-shebang.sh
+++ b/test/lint/lint-python-shebang.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 # Shebang must use python3 (not python or python2)
+
+export LC_ALL=C
 EXIT_CODE=0
 for PYTHON_FILE in $(git ls-files -- "*.py"); do
     if [[ $(head -c 2 "${PYTHON_FILE}") == "#!" &&
diff --git a/test/lint/lint-python.sh b/test/lint/lint-python.sh
index 7d3555b6d4..d9d46d86d5 100755
--- a/test/lint/lint-python.sh
+++ b/test/lint/lint-python.sh
@@ -6,6 +6,8 @@
 #
 # Check for specified flake8 warnings in python files.
 
+export LC_ALL=C
+
 # E101 indentation contains mixed spaces and tabs
 # E112 expected an indented block
 # E113 unexpected indentation
diff --git a/test/lint/lint-shell-locale.sh b/test/lint/lint-shell-locale.sh
new file mode 100755
index 0000000000..d78bac2d47
--- /dev/null
+++ b/test/lint/lint-shell-locale.sh
@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+# Copyright (c) 2018 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#
+# Make sure all shell scripts:
+# a.) explicitly opt out of locale dependence using "export LC_ALL=C", or
+# b.) explicitly opt in to locale dependence using the annotation below.
+
+export LC_ALL=C
+
+EXIT_CODE=0
+for SHELL_SCRIPT in $(git ls-files -- "*.sh" | grep -vE "src/(secp256k1|univalue)/"); do
+    if grep -q "# This script is intentionally locale dependent by not setting \"export LC_ALL=C\"" "${SHELL_SCRIPT}"; then
+        continue
+    fi
+    FIRST_NON_COMMENT_LINE=$(grep -vE '^(#.*|)$' "${SHELL_SCRIPT}" | head -1)
+    if [[ ${FIRST_NON_COMMENT_LINE} != "export LC_ALL=C" ]]; then
+        echo "Missing \"export LC_ALL=C\" (to avoid locale dependence) as first non-comment non-empty line in ${SHELL_SCRIPT}"
+        EXIT_CODE=1
+    fi
+done
+exit ${EXIT_CODE}
diff --git a/test/lint/lint-shell.sh b/test/lint/lint-shell.sh
index 5f5fa9a925..bf56db90c6 100755
--- a/test/lint/lint-shell.sh
+++ b/test/lint/lint-shell.sh
@@ -6,6 +6,10 @@
 #
 # Check for shellcheck warnings in shell scripts.
 
+# This script is intentionally locale dependent by not setting "export LC_ALL=C"
+# to allow running certain versions of shellcheck that core dump when LC_ALL=C
+# is set.
+
 # Disabled warnings:
 # SC2001: See if you can use ${variable//search/replace} instead.
 # SC2004: $/${} is unnecessary on arithmetic variables.
diff --git a/test/lint/lint-tests.sh b/test/lint/lint-tests.sh
index ffc0660551..9d83547df4 100755
--- a/test/lint/lint-tests.sh
+++ b/test/lint/lint-tests.sh
@@ -6,6 +6,7 @@
 #
 # Check the test suite naming conventions
 
+export LC_ALL=C
 EXIT_CODE=0
 
 NAMING_INCONSISTENCIES=$(git grep -E '^BOOST_FIXTURE_TEST_SUITE\(' -- \
diff --git a/test/lint/lint-whitespace.sh b/test/lint/lint-whitespace.sh
index c5d43043d5..128aa10da5 100755
--- a/test/lint/lint-whitespace.sh
+++ b/test/lint/lint-whitespace.sh
@@ -8,6 +8,7 @@
 
 # We can't run this check unless we know the commit range for the PR.
 
+export LC_ALL=C
 while getopts "?" opt; do
   case $opt in
     ?)