From: Tamar Christina <tamar.christina@arm.com>
Date: Fri, 17 Jul 2020 12:12:00 +0000 (+0100)
Subject: Arm: Add GCC_CPUINFO override
X-Git-Tag: releases/gcc-9.4.0~743
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a1360f71887b6f3832f7ec045da245b2e3fa48a0;p=thirdparty%2Fgcc.git

Arm: Add GCC_CPUINFO override

This adds an in intentionally undocumented environment variable
GCC_CPUINFO which can be used to test -mcpu=native.

Tests using these are added later on.

gcc/ChangeLog:

	* config/arm/driver-arm.c (host_detect_local_cpu): Add GCC_CPUINFO.

(cherry picked from commit 34a6c43487caf3a2a0ec9c7c79c526d116abc8b9)
---

diff --git a/gcc/config/arm/driver-arm.c b/gcc/config/arm/driver-arm.c
index a13f905e9f86..7d5d82ec7e6e 100644
--- a/gcc/config/arm/driver-arm.c
+++ b/gcc/config/arm/driver-arm.c
@@ -61,6 +61,7 @@ host_detect_local_cpu (int argc, const char **argv)
   FILE *f = NULL;
   bool arch;
   const struct vendor_cpu *cpu_table = NULL;
+  char *fcpu_info = NULL;
 
   if (argc < 1)
     goto not_found;
@@ -69,7 +70,12 @@ host_detect_local_cpu (int argc, const char **argv)
   if (!arch && strcmp (argv[0], "cpu") != 0 && strcmp (argv[0], "tune"))
     goto not_found;
 
-  f = fopen ("/proc/cpuinfo", "r");
+  fcpu_info = getenv ("GCC_CPUINFO");
+  if (fcpu_info)
+    f = fopen (fcpu_info, "r");
+  else
+    f = fopen ("/proc/cpuinfo", "r");
+
   if (f == NULL)
     goto not_found;