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Externally referenced globals should be marked extern to avoid stuff like this happening:
ld: warning: tentative definition of '_subsections_via_symbols' with size 16 from 'app.o' is being replaced by real definition of smaller size 4 from 'as.o'
ld: warning: tentative definition of '_subsections_via_symbols' with size 16 from 'atof-ieee.o' is being replaced by real definition of smaller size 4 from 'as.o'
...
--- cctools-809/as/as.h.orig 2015-01-28 23:52:40.000000000 +0100
+++ cctools-809/as/as.h 2015-01-28 23:52:52.000000000 +0100
@@ -179,7 +179,7 @@
extern char *specific_archflag;
/* TRUE if the .subsections_via_symbols directive was seen */
-int subsections_via_symbols;
+extern int subsections_via_symbols;
/* -I path options for .includes */
struct directory_stack {
--- cctools-809/as/arm.c.orig 2015-01-28 23:57:23.000000000 +0100
+++ cctools-809/as/arm.c 2015-01-28 23:57:35.000000000 +0100
@@ -151,8 +151,7 @@
# define N_(String) (String)
/* STUFF FROM gas/as.h */
-#define COMMON
-COMMON subsegT now_subseg;
+extern subsegT now_subseg;
/* STUFF FROM gas/config/tc-arm.h */
#define ARM_FLAG_THUMB (1 << 0) /* The symbol is a Thumb symbol rather than an Arm symbol. */
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