[PATCH] Remove size limit of PCH

[LIU Hao <lh_mouse@126.com>]

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Remove the limit and solve https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940.

I have tested the patch on `x86_64-w64-mingw32` with MSVCRT, by pre-compiling a header of many 
standard and boost headers to generate a 313-MiB-large .gch file and using it to compile a simple 
'hello world' program, and seen no problems so far.


After eighteen years this has eventually been settled. (sigh)


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Best regards,
LIU Hao

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From c084ab275f47cc27621e664d1c63e177525cf321 Mon Sep 17 00:00:00 2001
From: LIU Hao <lh_mouse@126.com>
Date: Tue, 10 May 2022 13:19:07 +0800
Subject: [PATCH] Remove size limit of PCH

Reference: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=14940
Signed-off-by: LIU Hao <lh_mouse@126.com>
---
 gcc/config/i386/host-mingw32.cc | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/gcc/config/i386/host-mingw32.cc b/gcc/config/i386/host-mingw32.cc
index 3b0d83ffc60..f915b85abd0 100644
--- a/gcc/config/i386/host-mingw32.cc
+++ b/gcc/config/i386/host-mingw32.cc
@@ -44,9 +44,6 @@ static size_t mingw32_gt_pch_alloc_granularity (void);
 
 static inline void w32_error(const char*, const char*, int, const char*);
 
-/* FIXME: Is this big enough?  */
-static const size_t pch_VA_max_size  = 128 * 1024 * 1024;
-
 /* Granularity for reserving address space.  */
 static size_t va_granularity = 0x10000;
 
@@ -88,9 +85,6 @@ static void *
 mingw32_gt_pch_get_address (size_t size, int)
 {
   void* res;
-  size = (size + va_granularity - 1) & ~(va_granularity - 1);
-  if (size > pch_VA_max_size)
-    return NULL;
 
   /* FIXME: We let system determine base by setting first arg to NULL.
      Allocating at top of available address space avoids unnecessary
@@ -100,7 +94,7 @@ mingw32_gt_pch_get_address (size_t size, int)
      If we allocate at bottom we need to reserve the address as early
      as possible and at the same point in each invocation. */
  
-  res = VirtualAlloc (NULL, pch_VA_max_size,
+  res = VirtualAlloc (NULL, size,
 		      MEM_RESERVE | MEM_TOP_DOWN,
 		      PAGE_NOACCESS);
   if (!res)
@@ -150,7 +144,7 @@ mingw32_gt_pch_use_address (void *&addr, size_t size, int fd,
 
   /* Offset must be also be a multiple of allocation granularity for
      this to work.  We can't change the offset. */ 
-  if ((offset & (va_granularity - 1)) != 0 || size > pch_VA_max_size)
+  if ((offset & (va_granularity - 1)) != 0)
     return -1;
 
 
-- 
2.36.0


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