Add a test for DECL_ALIGN support, and add a trivial definition to

src/config.h if 8-byte alignment is not supported.

1 files changed, 16 insertions, 0 deletions

diff --git a/config.bat b/config.bat
index c7be653b873..64775244391 100644
--- a/config.bat
+++ b/config.bat
@@ -158,6 +158,22 @@ goto src42
 :src41

 sed -f ../msdos/sed2v2.inp <config.tmp >config.h2

 :src42

+Rem See if DECL_ALIGN can be supported with this GCC

+rm -f junk.c junk.o junk junk.exe

+echo struct { int i; char *p; } __attribute__((__aligned__(8))) foo;  >junk.c

+rem Two percent signs because it is a special character for COMMAND.COM

+echo int main(void) { return (unsigned long)&foo %% 8; }             >>junk.c

+gcc -o junk junk.c

+if not exist junk.exe coff2exe junk

+junk

+If Not ErrorLevel 1 Goto alignOk

+Echo WARNING: Your GCC does not support 8-byte aligned variables.

+Echo WARNING: Therefore Emacs cannot support buffers larger than 128MB.

+rem The following line disables DECL_ALIGN which in turn disables USE_LSB_TAG

+rem For details see lisp.h where it defines USE_LSB_TAG

+echo #define DECL_ALIGN(type, var) type var >>config.h2

+:alignOk

+rm -f junk.c junk junk.exe

 update config.h2 config.h >nul

 rm -f config.tmp config.h2