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# Copyright 2005-2019 The Mumble Developers. All rights reserved.
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file at the root of the
# Mumble source tree or at <https://www.mumble.info/LICENSE>.
# This .pri files finds a suitable protoc binary on the system.
#
# It exposes the found protoc binary as the 'PROTOC' qmake variable.
# This variable contains the absolute path to a working protoc binary.
#
# Why do we need to do this?
#
# The protobuf compiler's binary name in MinGW packages for Linux
# cross-compiling is never 'protoc', but something like
# 'x86_64-w64-mingw32.static-protoc'.
#
# This file tries to use the right binary, by searching in $PATH
# using the 'which' tool.
#
# If no binary is found, an error is shown to the user.
#
# This script also supports setting a MUMBLE_PROTOC environment
# variable to specify an absolute path to a protoc binary to use.
# Setting this environment variable overrides any querying.
include(qt.pri)
PROTOC = $$(MUMBLE_PROTOC)
# If the MUMBLE_PROTOC environment variable isn't set
isEmpty(PROTOC) {
# If we're on Qt 4 on win32, or we're building from Windows, use "protoc"
equals(QMAKE_HOST.os, "Windows")|equals(QMAKE_VERSION_INT_MAJOR, 4):win32 {
PROTOC=protoc
} else {
# Determine if the 'which' tool is available. We need it
# to determine which PROTOC binary on the system to use.
# If 'which' isn't available, error out.
# Calling 'which which' is intentional.
# If which is available, it will print the path to it.
# If it isn't available, it will not print anything.
WHICH=$$system(which which 2>/dev/null)
isEmpty(WHICH) {
message("The 'which' command is not available on the system. Unable to search for protoc installations. Assuming 'protoc'... If this is not correct, please point the MUMBLE_PROTOC environment variable at a working protoc binary.")
PROTOC=protoc
} else {
TARGET_TRIPLE = $$system($${QMAKE_CC} -dumpmachine 2>/dev/null)
!isEmpty(TARGET_TRIPLE) {
isEmpty(PROTOC) {
PROTOC=$$system(which $$TARGET_TRIPLE"-protoc" 2>/dev/null)
}
isEmpty(PROTOC) {
PROTOC=$$system(which $$TARGET_TRIPLE".static-protoc" 2>/dev/null)
}
isEmpty(PROTOC) {
PROTOC=$$system(which $$TARGET_TRIPLE".shared-protoc" 2>/dev/null)
}
}
isEmpty(PROTOC) {
PROTOC=$$system(which protoc 2>/dev/null)
}
isEmpty(PROTOC) {
error("Unable to find system's protoc binary. Some scripts invoked during the Mumble build use the protobuf compiler. You can manually specify it via the MUMBLE_PROTOC environment variable.")
}
}
}
}
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