https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105858
--- Comment #8 from Brecht Sanders <brechtsanders at users dot sourceforge.net> --- I seem to be having some success after applying patches based on: https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-gcc/0010-Fix-using-large-PCH.patch https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-gcc/0021-PR14940-Allow-a-PCH-to-be-mapped-to-a-different-addr.patch My patch for GCC 12.2.0 looks like this: patch -ulbf gcc/config/i386/host-mingw32.cc << EOF @@ -46,5 +46,2 @@ -/* FIXME: Is this big enough? */ -static const size_t pch_VA_max_size = 128 * 1024 * 1024; - /* Granularity for reserving address space. */ @@ -90,5 +87,2 @@ void* res; - size = (size + va_granularity - 1) & ~(va_granularity - 1); - if (size > pch_VA_max_size) - return NULL; @@ -102,3 +96,3 @@ - res = VirtualAlloc (NULL, pch_VA_max_size, + res = VirtualAlloc (NULL, size, MEM_RESERVE | MEM_TOP_DOWN, @@ -143,3 +137,2 @@ OSVERSIONINFO version_info; - int r; @@ -152,3 +145,3 @@ 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; @@ -177,21 +170,20 @@ - /* Retry five times, as here might occure a race with multiple gcc's - instances at same time. */ - for (r = 0; r < 5; r++) - { - mmap_addr = MapViewOfFileEx (mmap_handle, FILE_MAP_COPY, 0, offset, - size, addr); - if (mmap_addr == addr) - break; - if (r != 4) - Sleep (500); - } - - if (mmap_addr != addr) + /* Try mapping the file at \`addr\`. */ + mmap_addr = MapViewOfFileEx (mmap_handle, FILE_MAP_COPY, 0, offset, + size, addr); + if (mmap_addr == NULL) { - w32_error (__FUNCTION__, __FILE__, __LINE__, "MapViewOfFileEx"); - CloseHandle(mmap_handle); - return -1; + /* We could not map the file at its original address, so let the + system choose a different one. The PCH can be relocated later. */ + mmap_addr = MapViewOfFileEx (mmap_handle, FILE_MAP_COPY, 0, offset, + size, NULL); + if (mmap_addr == NULL) + { + w32_error (__FUNCTION__, __FILE__, __LINE__, "MapViewOfFileEx"); + CloseHandle(mmap_handle); + return -1; + } } + addr = mmap_addr; return 1; EOF
