New compiler method: check_header

This checks not only for existence, but also for usability of the
header, which means it does a full compilation and not just
pre-processing or __has_include.

Fixes https://github.com/mesonbuild/meson/issues/2246

1 files changed, 6 insertions, 0 deletions

diff --git a/mesonbuild/compilers/c.py b/mesonbuild/compilers/c.py
index 13b3dcc..4cc9660 100644
--- a/mesonbuild/compilers/c.py
+++ b/mesonbuild/compilers/c.py
@@ -266,6 +266,12 @@ class CCompiler(Compiler):
         code = 'int main(int argc, char **argv) { int class=0; return class; }\n'
         return self.sanity_check_impl(work_dir, environment, 'sanitycheckc.c', code)
 
+    def check_header(self, hname, prefix, env, extra_args=None, dependencies=None):
+        fargs = {'prefix': prefix, 'header': hname}
+        code = '''{prefix}
+        #include <{header}>'''
+        return self.compiles(code.format(**fargs), env, extra_args, dependencies)
+
     def has_header(self, hname, prefix, env, extra_args=None, dependencies=None):
         fargs = {'prefix': prefix, 'header': hname}
         code = '''{prefix}