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Fix for Cmake on systems without Git (#594)

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If you didn't have Git installed, execute_process never declared the
error variable, which led to it never parsing the header for a version.
So if Git wasn't installed, the version variable never got declared,
which caused errors.

This fixes that.
This commit is contained in:
KTGH 2020-07-31 13:46:12 -04:00 committed by GitHub
parent 48da75dd35
commit 999f6abd2c
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1 changed files with 14 additions and 10 deletions
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14
CMakeLists.txt
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@ -1,6 +1,6 @@
#[[
Build options:
* BUILD_SHARED_LIBS (default off) builds as a static library (if HTTPLIB_COMPILE is ON)
* BUILD_SHARED_LIBS (default off) builds as a shared library (if HTTPLIB_COMPILE is ON)
* HTTPLIB_USE_OPENSSL_IF_AVAILABLE (default on)
* HTTPLIB_USE_ZLIB_IF_AVAILABLE (default on)
* HTTPLIB_REQUIRE_OPENSSL (default off)
@ -60,17 +60,21 @@
]]
cmake_minimum_required(VERSION 3.14.0 FATAL_ERROR)
# On systems without Git installed, there were errors since execute_process seemed to not throw an error without it?
find_package(Git QUIET)
if(Git_FOUND)
# Gets the latest tag as a string like "v0.6.6"
# Can silently fail if git isn't on the system
execute_process(COMMAND git describe --tags --abbrev=0
execute_process(COMMAND ${GIT_EXECUTABLE} describe --tags --abbrev=0
OUTPUT_VARIABLE _raw_version_string
ERROR_VARIABLE _git_tag_error
)
endif()
# execute_process can fail silenty, so check for an error
# if there was an error, just use the user agent as a version
if(_git_tag_error)
message(WARNING "cpp-httplib failed to find the latest git tag, falling back to using user agent as the version.")
if(_git_tag_error OR NOT Git_FOUND)
message(WARNING "cpp-httplib failed to find the latest Git tag, falling back to using user agent as the version.")
# Get the user agent and use it as a version
# This gets the string with the user agent from the header.
# This is so the maintainer doesn't actually need to update this manually.
@ -101,7 +105,7 @@ if(HTTPLIB_COMPILE)
endif()
option(HTTPLIB_REQUIRE_BROTLI "Requires Brotli to be found & linked, or fails build." OFF)
option(HTTPLIB_USE_BROTLI_IF_AVAILABLE "Uses Brotli (if available) to enable Brotli compression support." ON)
option(HTTPLIB_USE_BROTLI_IF_AVAILABLE "Uses Brotli (if available) to enable Brotli decompression support." ON)
# Defaults to static library
option(BUILD_SHARED_LIBS "Build the library as a shared library instead of static. Has no effect if using header-only." OFF)
if (BUILD_SHARED_LIBS AND WIN32 AND HTTPLIB_COMPILE)