[gtk+/wip/meson] meson: simplify header checks

[Tim-Philipp Müller <tpm src gnome org>]

commit e4f42c57c69af0c82c5fdcee2a0014fadf06173e
Author: Tim-Philipp Müller <tim centricular com>
Date:   Thu Mar 23 19:15:44 2017 +0000

    meson: simplify header checks
    
    Remove workaround for gcc bug (Meson does that now), and
    construct the right config.h defines for the headers on
    the fly instead of listing them in the build file, which
    is more error prone.

 meson.build |   50 ++++++++++++++++++++++----------------------------
 1 files changed, 22 insertions(+), 28 deletions(-)
---
diff --git a/meson.build b/meson.build
index db4950a..6e221df 100644
--- a/meson.build
+++ b/meson.build
@@ -90,41 +90,35 @@ cdata.set('GTK_MINOR_VERSION', gtk_minor_version)
 cdata.set('GTK_MICRO_VERSION', gtk_micro_version)
 cdata.set('GTK_BINARY_AGE', gtk_binary_age)
 cdata.set('GTK_INTERFACE_AGE', gtk_interface_age)
+
 check_headers = [
-  ['HAVE_CRT_EXTERNS_H', 'crt/externs.h'],
-  ['HAVE_DLFCN_H', 'dlfcn.h'],
-  ['HAVE_FTW_H', 'ftw.h'],
-  ['HAVE_INTTYPES_H', 'inttypes.h'],
-  ['HAVE_LOCALE_H', 'locale.h'],
-  ['HAVE_MEMORY_H', 'memory.h'],
-  ['HAVE_STDINT_H', 'stdint.h'],
-  ['HAVE_STDLIB_H', 'stdlib.h'],
-  ['HAVE_STRINGS_H', 'strings.h'],
-  ['HAVE_STRING_H', 'string.h'],
-  ['HAVE_SYS_MMAN_H', 'sys/mman.h'],
-  ['HAVE_SYS_PARAM_H', 'sys/param.h'],
-  ['HAVE_SYS_STAT_H', 'sys/stat.h'],
-  ['HAVE_SYS_SYSINFO_H', 'sys/sysinfo.h'],
-  ['HAVE_SYS_SYSTEMINFO_H', 'sys/systeminfo.h'],
-  ['HAVE_SYS_TIME_H', 'sys/time.h'],
-  ['HAVE_SYS_TYPES_H', 'sys/types.h'],
-  ['HAVE_UNISTD_H', 'unistd.h'],
-  #['HAVE_LINUX_MEMFD_H', 'linux/memfd.h'], # FIXME: doesn't work, see below
+  'crt/externs.h',
+  'dlfcn.h',
+  'ftw.h',
+  'inttypes.h',
+  'linux/memfd.h',
+  'locale.h',
+  'memory.h',
+  'stdint.h',
+  'stdlib.h',
+  'strings.h',
+  'string.h',
+  'sys/mman.h',
+  'sys/param.h',
+  'sys/stat.h',
+  'sys/sysinfo.h',
+  'sys/systeminfo.h',
+  'sys/time.h',
+  'sys/types.h',
+  'unistd.h',
 ]
 
 foreach h : check_headers
-  if cc.has_header(h.get(1))
-    cdata.set(h.get(0), 1)
+  if cc.has_header(h)
+    cdata.set('HAVE_' + h.underscorify().to_upper(), 1)
   endif
 endforeach
 
-# FIXME: cc.has_header('linux/memfd.h') doesn't work with meson 0.39 and gcc
-# https://github.com/mesonbuild/meson/issues/1458
-# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80005
-if cc.has_header_symbol('linux/memfd.h', 'MFD_CLOEXEC')
-  cdata.set('HAVE_LINUX_MEMFD_H', 1)
-endif
-
 # Maths functions might be implemented in libm
 libm = cc.find_library('m', required : false)