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CMake: Remove glibc version detection

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If we were conditionally enabling _BSD_SOURCE or _SVID_SOURCE, I can
understand trying to play nice with the compiler and only pass as
needed, however this is not the case and glibc <= 2.19 will not care
that we are passing _DEFAULT_SOURCE. This removes an unnecessary
build step and gives us less to maintain from a build system
perspective.

Small cosmetic changes to MacroQbtCompilerSettings are included.
This commit is contained in:
NotTsunami 2020-01-18 09:37:56 -05:00
parent b7f2122c06
commit f066d8d786
2 changed files with 5 additions and 65 deletions
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49
cmake/Modules/MacroGlibcDetect.cmake
View File

@ -1,49 +0,0 @@
###############################################################
#
# Copyright 2011 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you
# may not use this file except in compliance with the License. You may
# obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
###############################################################
MACRO (GLIBC_DETECT _VERSION)
# there are multiple ways to detect glibc, but given nmi's
# cons'd up paths I will trust only gcc. I guess I could also use
# ldd --version to detect.
set(_GLIB_SOURCE_DETECT "
#include <limits.h>
#include <stdio.h>
int main()
{
printf(\"%d%d\",__GLIBC__, __GLIBC_MINOR__);
return 0;
}
")
file (WRITE ${CMAKE_CURRENT_BINARY_DIR}/build/cmake/glibc.cpp "${_GLIB_SOURCE_DETECT}\n")
try_run(POST26_GLIBC_DETECTED
POST26_GLIBC_COMPILE
${CMAKE_CURRENT_BINARY_DIR}/build/cmake
${CMAKE_CURRENT_BINARY_DIR}/build/cmake/glibc.cpp
RUN_OUTPUT_VARIABLE GLIBC_VERSION )
if (GLIBC_VERSION AND POST26_GLIBC_COMPILE )
set(${_VERSION} ${GLIBC_VERSION})
else()
message(STATUS "NOTE: Could not detect GLIBC_VERSION from compiler")
endif()
ENDMACRO (GLIBC_DETECT)

21
cmake/Modules/MacroQbtCompilerSettings.cmake
View File

@ -24,8 +24,8 @@ macro(qbt_set_compiler_options)
#"-Wno-error=sign-conversion -Wno-error=float-equal"
)
# GCC 4.8 has problems with std::array and its initialization
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
# GCC 4.8 has problems with std::array and its initialization
list(APPEND _GCC_COMMON_CXX_FLAGS "-Wno-error=missing-field-initializers")
endif()
@ -39,22 +39,11 @@ macro(qbt_set_compiler_options)
endif (_PEDANTIC_IS_SUPPORTED)
if (CMAKE_SYSTEM_NAME MATCHES Linux)
# if Glibc version is 2.20 or higher, set -D_DEFAULT_SOURCE
include(MacroGlibcDetect)
message(STATUS "Detecting Glibc version...")
glibc_detect(GLIBC_VERSION)
if(${GLIBC_VERSION})
if(GLIBC_VERSION LESS "220")
message(STATUS "Glibc version is ${GLIBC_VERSION}")
else(GLIBC_VERSION LESS "220")
message(STATUS "Glibc version is ${GLIBC_VERSION}, adding -D_DEFAULT_SOURCE")
add_definitions(-D_DEFAULT_SOURCE)
endif(GLIBC_VERSION LESS "220")
endif(${GLIBC_VERSION})
endif (CMAKE_SYSTEM_NAME MATCHES Linux)
add_definitions(-D_DEFAULT_SOURCE)
endif()
# Clang 5.0 still doesn't support -Wstrict-null-sentinel
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
# Clang 5.0 still doesn't support -Wstrict-null-sentinel
check_cxx_compiler_flag(-Wstrict-null-sentinel _STRICT_NULL_SENTINEL_IS_SUPPORTED)
if (_STRICT_NULL_SENTINEL_IS_SUPPORTED)
list(APPEND _GCC_COMMON_CXX_FLAGS "-Wstrict-null-sentinel")
@ -75,7 +64,7 @@ macro(qbt_set_compiler_options)
endif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
set(QBT_ADDITONAL_FLAGS "-wd4290 -wd4275 -wd4251 /W4" CACHE STRING "Additional qBittorent compile flags")
set(QBT_ADDITONAL_FLAGS "/wd4251 /wd4275 /wd4290 /W4" CACHE STRING "Additional qBittorent compile flags")
endif ()
string(APPEND CMAKE_C_FLAGS " ${QBT_ADDITONAL_FLAGS}")