[S] Change in flashrom[master]: Remove dependency on C23 __has_include()

[Anton Samsonov (Code Review)]

Anton Samsonov has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/77089?usp=email )

Change subject: Remove dependency on C23 __has_include()
......................................................................

Remove dependency on C23 __has_include()

Clang, GCC and C23-aware compilers will still use `__has_include()`
to check for header presence. Old and alternative compilers will
fall back to unconditional inclusion, unless user-supplied macros
`HAVE_GETOPT_H` and `HAVE_PCIUTILS_PCI_H` are defined as 1 or 0.

Change-Id: Ic544963ffd29626ae0a21bdddb1c78850cc43ec6
Signed-off-by: Anton Samsonov 
---
M include/cli_classic.h
M include/platform/pci.h
2 files changed, 22 insertions(+), 4 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/89/77089/1

diff --git a/include/cli_classic.h b/include/cli_classic.h
index e651cc6..7e2848b 100644
--- a/include/cli_classic.h
+++ b/include/cli_classic.h
@@ -15,9 +15,21 @@
 #ifndef CLI_CLASSIC_H
 #define CLI_CLASSIC_H

-#if __has_include(<getopt.h>)
+#if HAVE_GETOPT_H
 #include <getopt.h>
+#elif !defined(HAVE_GETOPT_H)
+#if !defined(__has_include) && (__STDC_VERSION__ < 202300L)
+#include <getopt.h>
+#define HAVE_GETOPT_H 1
+#elif __has_include(<getopt.h>)
+#include <getopt.h>
+#define HAVE_GETOPT_H 1
 #else
+#define HAVE_GETOPT_H 0
+#endif /* __has_include() */
+#endif /* HAVE_GETOPT_H */
+
+#if !HAVE_GETOPT_H

#define	no_argument		0
 #define required_argument	1
@@ -39,5 +51,5 @@
 int getopt_long_only (int argc, char *const *argv, const char *shortopts,
    		const struct option *longopts, int *longind);

-#endif /* __has_include() */
+#endif /* HAVE_GETOPT_H */
 #endif /* CLI_CLASSIC_H */
diff --git a/include/platform/pci.h b/include/platform/pci.h
index 4ac108f..5e350ac 100644
--- a/include/platform/pci.h
+++ b/include/platform/pci.h
@@ -22,10 +22,16 @@
  * e.g. NetBSD 9.0 on sparc64 pciutils-3.7.0nb2.
  * Other NetBSD platforms and versions uses the default path under pci/pci.h
  */
-#if __has_include(<pciutils/pci.h>)
+#if !defined(__has_include) && (__STDC_VERSION__ < 202300L)
+#if HAVE_PCIUTILS_PCI_H
 #include <pciutils/pci.h>
 #else
 #include <pci/pci.h>
-#endif
+#endif /* HAVE_PCIUTILS_PCI_H */
+#elif __has_include(<pciutils/pci.h>)
+#include <pciutils/pci.h>
+#else
+#include <pci/pci.h>
+#endif /* __has_include(<pciutils/pci.h>) */

#endif /* __PLATFORM_PCI_H__ */