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Globally set the _GNU_SOURCE define for CMake configuration checks

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This commit is contained in:
Mahmoud Al-Qudsi 2019-01-04 14:04:18 -06:00
parent 04f1ea0680
commit 490432c177
1 changed files with 13 additions and 12 deletions
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25
cmake/ConfigureChecks.cmake
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@ -1,3 +1,14 @@
# The following defines affect the environment configuration tests are run in:
# CMAKE_REQUIRED_DEFINITIONS, CMAKE_REQUIRED_FLAGS, CMAKE_REQUIRED_LIBRARIES,
# and CMAKE_REQUIRED_INCLUDES
# `wcstod_l` is a GNU-extension, sometimes hidden behind GNU-related defines.
# This is the case for at least Cygwin and Newlib.
LIST(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE=1)
IF(APPLE)
# 10.7+ only.
LIST(APPEND CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} "-Werror=unguarded-availability")
ENDIF()
# Try using CMake's own logic to locate curses/ncurses
FIND_PACKAGE(Curses)
IF(NOT ${CURSES_FOUND})
@ -19,11 +30,6 @@ IF(CMAKE_VERSION VERSION_LESS 3.4.0)
ENDIF()
FIND_PACKAGE(Threads REQUIRED)
IF(APPLE)
# 10.7+ only.
SET(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} "-Werror=unguarded-availability")
ENDIF()
# Detect WSL. Does not match against native Windows/WIN32.
if (CMAKE_HOST_SYSTEM_VERSION MATCHES ".*-Microsoft")
SET(WSL 1)
@ -89,19 +95,14 @@ CHECK_CXX_SYMBOL_EXISTS(wcslcpy wchar.h HAVE_WCSLCPY)
CHECK_CXX_SYMBOL_EXISTS(wcsncasecmp wchar.h HAVE_WCSNCASECMP)
CHECK_CXX_SYMBOL_EXISTS(wcsndup wchar.h HAVE_WCSNDUP)
CMAKE_PUSH_CHECK_STATE(RESET)
# `wcstod_l` is a GNU-extension, sometimes hidden behind the following define
LIST(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE=1)
# `xlocale.h` is required to find `wcstod_l` in `wchar.h` under FreeBSD, but
# it's not present under Linux.
SET(WCSTOD_L_INCLUDES "")
# `xlocale.h` is required to find `wcstod_l` in `wchar.h` under FreeBSD,
# but it's not present under Linux.
CHECK_INCLUDE_FILES("xlocale.h" HAVE_XLOCALE_H)
IF(HAVE_XLOCALE_H)
LIST(APPEND WCSTOD_L_INCLUDES "xlocale.h")
ENDIF()
LIST(APPEND WCSTOD_L_INCLUDES "wchar.h")
CHECK_CXX_SYMBOL_EXISTS(wcstod_l "${WCSTOD_L_INCLUDES}" HAVE_WCSTOD_L)
CMAKE_POP_CHECK_STATE()
CHECK_CXX_SYMBOL_EXISTS(_sys_errs stdlib.h HAVE__SYS__ERRS)