From 02a132616ac69cd546c823c47afd60eab738792c Mon Sep 17 00:00:00 2001
From: Karthik Nayak <karthik.188@gmail.com>
Date: Wed, 23 Apr 2025 10:15:38 +0200
Subject: [PATCH] meson: add support for 'hdr-check'

The Makefile supports a target called 'hdr-check', which checks if
individual header files can be independently compiled. Let's port this
functionality to Meson, our new build system too. The implementation
resembles that of the Makefile and provides the same check.

Since meson builds are out-of-tree, header dependencies are not
automatically met. So unlike the Makefile version, we also need to add
the required dependencies.

Also add the 'xdiff/' dir to the list of 'third_party_sources' as those
headers must be skipped from the checks too. This also skips the folder
from the 'coccinelle' checks, this is okay, since this code is an
external dependency.

Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 meson.build | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/meson.build b/meson.build
index 4618804c7a..22fc65ec80 100644
--- a/meson.build
+++ b/meson.build
@@ -645,6 +645,7 @@ third_party_excludes = [
   ':!sha1dc',
   ':!t/unit-tests/clar',
   ':!t/t[0-9][0-9][0-9][0-9]*',
+  ':!xdiff',
 ]
 
 headers_to_check = []
@@ -1994,6 +1995,68 @@ endif
 
 subdir('contrib')
 
+exclude_from_check_headers = [
+  'compat/',
+  'unicode-width.h',
+]
+
+if sha1_backend != 'openssl'
+  exclude_from_check_headers += 'sha1/openssl.h'
+endif
+if sha256_backend != 'openssl'
+  exclude_from_check_headers += 'sha256/openssl.h'
+endif
+if sha256_backend != 'nettle'
+  exclude_from_check_headers += 'sha256/nettle.h'
+endif
+if sha256_backend != 'gcrypt'
+  exclude_from_check_headers += 'sha256/gcrypt.h'
+endif
+
+if headers_to_check.length() != 0 and compiler.get_argument_syntax() == 'gcc'
+  hco_targets = []
+  foreach h : headers_to_check
+    skip_header = false
+    foreach exclude : exclude_from_check_headers
+      if h.startswith(exclude)
+        skip_header = true
+        break
+      endif
+    endforeach
+
+    if skip_header
+      continue
+    endif
+
+    hcc = custom_target(
+      input: h,
+      output: h.underscorify() + 'cc',
+      command: [
+        shell,
+        '-c',
+        'echo \'#include "git-compat-util.h"\' > @OUTPUT@ && echo \'#include "' + h + '"\' >> @OUTPUT@'
+      ]
+    )
+
+    hco = custom_target(
+      input: hcc,
+      output: fs.replace_suffix(h.underscorify(), '.hco'),
+      command: [
+        compiler.cmd_array(),
+        libgit_c_args,
+        '-I', meson.project_source_root(),
+        '-I', meson.project_source_root() / 't/unit-tests',
+        '-o', '/dev/null',
+        '-c', '-xc',
+        '@INPUT@'
+      ]
+    )
+    hco_targets += hco
+  endforeach
+
+  alias_target('hdr-check', hco_targets)
+endif
+
 foreach key, value : {
   'DIFF': diff.full_path(),
   'GIT_SOURCE_DIR': meson.project_source_root(),